CN222684450U - Sewage zero release processing apparatus of filter production line - Google Patents

Abstract

The utility model discloses a sewage zero-emission treatment device for a filter production line, and belongs to the field of wastewater treatment. The device comprises an oil removal unit, a reaction unit, a filtering unit, a water production unit, a dosing unit, a sludge treatment unit and a concentrated water treatment unit, wherein the feeding unit, the reaction unit, the filtering unit and the water production unit are sequentially connected, the dosing unit is respectively connected with the reaction unit and the filtering unit, the sludge treatment unit is respectively connected with the reaction unit and the filtering unit, the concentrated water treatment unit is connected with the rear end of the filtering unit, the device is used for treating sewage of a filter production line, the operation is simple, the daily operation is stable, and the water quality of the discharged water can meet the requirement of urban sewage recycling industrial water quality.

Description

Sewage zero release processing apparatus of filter production line

Technical Field

The utility model belongs to the field of wastewater treatment, and particularly relates to a sewage zero-emission treatment device for a filter production line.

Background

The comprehensive sewage generated during the production of the filter belongs to the oil-containing sewage of mechanical processing, and the main pollutants are CODcr, SS and the like. The Chemical Oxygen Demand (COD) concentration of the inlet water is 80-151 mg/L, the Biological Oxygen Demand (BOD) concentration is 30-40 mg/L, the ammonia nitrogen (NH ₃ -N) concentration is 0.043-1.10 mg/L, the Total Phosphorus (TP) concentration is 0.18-0.29 mg/L, the iron (Fe) concentration is 0.21-1.11 mg/L, the zinc (Zn) concentration is 0.05-0.24 mg/L, the nickel (Ni) concentration is <0.05mg/L, pH and is 8.80-10.16, and the alkali and suspended matter (SS) concentration is 34-51 mg/L.

The prior sewage zero discharge treatment technology of the filter production line is generally an oil separation tank, a flocculation sedimentation tank, a biochemical tank and a secondary sedimentation tank. The oil in the sewage is required to be removed, the dosage required by the flocculation sedimentation tank is large, and the operation cost is high. Meanwhile, the sewage is discharged in places to implement the process and product water standard in the urban sewage recycling Industrial Water quality (GB/T19923-2005).

Through retrieval, CN113603302A discloses a coking wastewater reduction treatment method. The coking wastewater is treated by the processes of an adjusting tank, air flotation degreasing, coagulating sedimentation, a biochemical homogenizing tank, a biological filter tank, a secondary sedimentation tank, a UV advanced ozone oxidation tank, ultrafiltration, reverse osmosis, a chemical softening tank, sand filtration, resin, an adjusting tank, ultrafiltration, nanofiltration and bipolar membrane electrodialysis, and the generated acid and alkali can be used for the process recycling such as pH adjustment in the treatment process. Is not suitable for the sewage of the filter production line containing heavy metals and mineral oil.

Patent CN114906975A discloses a zero-emission treatment process of coking wastewater, which comprises biochemical treatment, advanced treatment and salt separation crystallization, wherein the advanced treatment comprises wastewater pretreatment, reverse osmosis concentration and sludge dehydration. The pretreatment of the wastewater comprises pretreatment dosing, efficient clarification, multi-medium filtration, ultrafiltration, resin softening, carbon dioxide removal and organic matter removal, wherein the organic matter removal comprises adsorption in an adsorption tank, desorption outside the adsorption tank and wet oxidation of elution waste liquid.

Patent CN107253798A relates to a combined process for advanced treatment and reuse of wastewater in the iron and steel industry. After being treated by a cooling unit and an immersed ultrafiltration unit, the iron and steel industrial wastewater firstly enters a reverse osmosis unit for primary desalination, the desalted reverse osmosis produced water is sent to a water supply system for graded reuse, and the concentrated water generated by the reverse osmosis unit sequentially passes through a softening clarification tank, an ozone oxidation tank, a nitrification denitrification biological filter, a multi-medium filter, an external pressure ultrafiltration unit and the like for secondary desalination, and then enters a nanofiltration unit for secondary desalination, the desalted nanofiltration produced water is sent to the water supply system for graded reuse, and the concentrated water generated by the nanofiltration unit sequentially passes through a Fenton oxidation tank, an ozone oxidation tank, an activated carbon biological filter and a break point chlorination tank for treatment and then is discharged after reaching standards. However, the steel wastewater does not contain oil, and the influence of the oil on wastewater treatment is not required to be considered.

The patent CN101935118A discloses a hot water membrane purification and recycling process, which can work at high temperature by a combination process of ultra-micro filtration membrane system, reverse osmosis, nanofiltration membrane system, pretreatment, active carbon adsorption, ion exchange and the like, can purify various hot water and waste water, has double effects of recycling water resources and heat energy, and can adopt different process combinations and flows according to the components of water quality, and the application is different from the process for removing oil components such as mineral oil.

Disclosure of utility model

1. Problems to be solved

Aiming at the problems that the existing device is difficult to treat sewage of a filter production line, the biodegradability is poor, the suspended matter concentration is high, and the hardness is high, the utility model provides the sewage zero-emission treatment device for the filter production line, which is used for treating sewage of the filter production line, has simple operation and stable daily operation, and can ensure that the water quality of the effluent can meet the requirement of the urban sewage recycling industrial water quality.

2. Technical proposal

In order to solve the problems, the technical scheme adopted by the utility model is as follows:

The utility model provides a filter production line sewage zero release processing apparatus, includes deoiling unit, reaction unit, filtration unit, produces water unit, dosing unit, sludge treatment unit and dense water treatment unit, deoiling unit, reaction unit, filtration unit and produce water unit and connect gradually, dosing unit is connected with reaction unit and filtration unit respectively, sludge treatment unit is connected with reaction unit and filtration unit respectively, dense water treatment unit is connected with the filtration unit rear end.

The oil removal unit comprises an oil removal regulating tank, and the oil removal regulating tank is provided with a lifting pump for inputting sewage into the reaction unit.

Still further, the oil removal equalizing basin is the many check oil removal equalizing basins that the plane is the rectangle, and it is equipped with a plurality of cell body, oil removal equalizing basin lateral wall is equipped with the water hole, and sewage flows between adjacent oil removal equalizing basin through the water hole.

The reaction unit comprises an air floatation tank, a softening coagulation tank and an ozone catalytic oxidation tank which are connected in sequence.

The air floatation tank comprises a tank body and an air dissolving device, the air dissolving device comprises an air dissolving tank and an air floatation air dissolving pump connected with the air dissolving tank, and the air dissolving tank is used for introducing air into the position below the liquid surface of the tank body through the air floatation air dissolving pump. Still be equipped with in the air supporting pond and scrape the sediment device, it includes at least one and scrape the sediment board to scrape the sediment device, it is located the air supporting pond liquid level to scrape the sediment board, through drive arrangement operation, the air supporting pond below is equipped with the mud pond, through the continuous operation of scraping the sediment board, will float on the impurity on surface constantly and scrape to in the mud pond. The treated sewage overflows from the pipeline to the softening coagulation tank.

The softening coagulation tank comprises a reaction tank and a sedimentation tank, wherein the reaction tank and the sedimentation tank are isolated by a baffle, a water passing hole is formed in the baffle, wastewater flows between the reaction tank and the sedimentation tank through the water passing hole, the sedimentation tank is used for carrying out gravity sedimentation on flocculent sediment generated by the reaction tank, and the lower part of the sedimentation tank is connected with the sludge tank through a pipeline. And a stirring device is arranged in the reaction tank, and the wastewater and the reaction reagent are uniformly mixed.

Furthermore, the sedimentation tank is internally provided with inclined pipes which are parallel to each other, the inclined pipes are preferably made of PP materials, and the inclined pipes are utilized to partition the wastewater and the reaction reagent in the sedimentation tank, so that sedimentation accumulation and enrichment are reduced, and sedimentation efficiency is affected.

The ozone catalytic oxidation pond is isolated from the sedimentation pond through a baffle, an overflow weir is arranged on the upper portion of the baffle, an ozone generator is arranged in the ozone catalytic oxidation pond and used for oxidizing and removing organic matters, and finally the treated sewage enters a filtering unit for filtering.

Still further, still include the internal circulation pump, circulate through the internal circulation pump, let ozone and sewage fully react.

The filtering unit comprises a multi-medium filter and an SNF membrane device which are sequentially connected.

The SNF membrane device comprises a precision filter and an SNF membrane assembly, and is used for removing pollutants such as COD, ammonia nitrogen, divalent salt and the like in the wastewater, and the produced water of the SNF membrane system can reach the standard and be recycled after entering a produced water tank. The SNF membrane module comprises a precise filter, wherein an SNF booster pump is arranged in front of the precise filter and used for boosting water entering the precise filter, and an SNF high-pressure pump is arranged in front of the SNF membrane module and used for boosting water entering the SNF membrane module.

Still further, be equipped with former cask between multi-media multi-filter and the SNF membrane device.

The SNF membrane device is connected with a water production tank, and produced water meeting the standard of recycled water is recycled in the production process through a recycling water pump.

The dosing unit comprises at least one dosing tank for feeding materials into the air floatation tank and the softening coagulation tank, and a valve is arranged on a dosing pipeline of the dosing tank for controlling dosing flow.

The sludge treatment unit comprises a plate-and-frame filter press, the plate-and-frame filter press is connected with the sludge tank and is used for receiving sludge scraped by the slag scraping device of the air floatation tank and sludge precipitated to the bottom in the sedimentation tank, and the plate-and-frame filter press is used for filtering the sludge and processing the filtered sludge outside the sludge commission.

Furthermore, in the plate and frame filter pressing process, the pneumatic diaphragm pump is driven by the air compressor to realize rapid filter pressing of sludge.

The concentrated water treatment unit comprises a concentrated water bucket, the concentrated water bucket is connected with the SNF membrane assembly and receives concentrated water treated by the SNF membrane assembly, one end of the concentrated water bucket is connected with the air floatation tank, and a part of concentrated water in the concentrated water bucket is introduced into the air floatation tank and is reprocessed by the reaction unit and the filtering unit. The other end of the concentrated water bucket is connected with a concentrated water circulating bucket, the concentrated water circulating bucket is sequentially connected with a low-temperature evaporation concentrator and a cooling tower, the concentrated water is cooled by the low-temperature evaporation concentrator, salt is separated out at low temperature of the concentrated water, and the temperature is controlled to be about 160-200 ℃.

Wherein, agitating unit is equipped with in air supporting pond, the reaction tank for the misce bene of reactant.

The air floatation tank is provided with an online pH meter, and the pH value of the wastewater in the reaction unit is controlled to be 7-8.

A sewage zero discharge treatment method by utilizing the filter production line comprises the following steps:

s1, oil removal treatment, namely, oil removal treatment is carried out on the wastewater through flowing into an oil removal adjusting tank.

Wherein, the oil separation treatment utilizes the difference of specific gravity of suspended matters and water in the wastewater to achieve the purpose of separation. After the oily wastewater enters the oil separation regulating tank, the oily wastewater slowly flows along the horizontal direction, and flows through the multi-lattice oil separation regulating tank, so that the oil floats on the water surface in the flowing process, and the water passing holes are arranged below the water surface, so that the oil and other impurities on the water surface can be conveniently trapped. The separated sewage enters the last grid through the water passing holes and is lifted to the floatation tank through the oil separation adjusting tank lifting pump.

S2, coagulation air floatation, namely pumping the effluent of the oil separation regulating tank to an air floatation tank, adding a neutralizing agent, a flocculating agent and a coagulant aid, and floating the oil substances, suspended matters, COD and other pollutants in the wastewater to the water surface under the action of dissolved air water to be removed by a slag scraping system.

Wherein the neutralizing agent comprises one or more of caustic soda flakes, lime and sodium carbonate, which are used for adjusting the wastewater to a proper pH range, preferably pH value is 7-8, so that the wastewater is easy to coagulate, the flocculating agent comprises one or more of PAC, aluminum sulfate and ferrous chloride, which are used for gathering suspended substances and colloidal substances in the water, and the coagulant aid comprises one or more of PAM, PCE and biological glue.

S3, softening and coagulating, namely, clarifying the effluent from the air floatation tank, flowing into the softening and coagulating tank, and further precipitating and removing pollutants such as COD, suspended matters, heavy metals and the like in the wastewater under the action of a softener, a flocculating agent and a coagulant aid, so as to reduce the hardness of the water, reduce the metal ions in the concentrated solution after membrane filtration, and reduce the amount of the concentrated solution.

The softening agent comprises one or more of sodium carbonate, quicklime and slaked lime, and is used for removing hardness in water, namely 2-valence metal ion calcium, magnesium and the like, the flocculating agent comprises one or more of PAC, aluminum sulfate and ferrous chloride, the precipitated substances formed by 2-valence metal ions are aggregated, the coagulant aid comprises one or more of PAM, PCE and biological glue, and the aggregated substances are connected, so that the flocculent volume is increased and the precipitation is facilitated.

The water conservancy of the softening coagulation sedimentation tank accords with 0.5m ³/(m² h).

S4, ozone oxidation, namely enabling supernatant water obtained from the sedimentation tank to flow into an ozone catalytic oxidation tank, and removing refractory substances in the wastewater by strong oxidation through ozone generated by an ozone generator.

Wherein, an ozone generator is arranged in the ozone catalytic oxidation pond.

S5, adsorption and filtration, namely pumping the effluent of the ozone catalytic oxidation pond to a multi-medium filter through a water inlet pump to adsorb and filter micro suspended matters, so as to ensure the stable operation of a post-treatment system.

The medium in the multi-medium filter comprises quartz sand, anthracite, active carbon, magnetite, garnet, porous ceramic, plastic balls and the like, and in the screening process of the multi-medium filter, larger particles and suspended matters are intercepted in the deep part of a filter material when the material layer is filtered by water flow, and smaller particles and dissolved matters can pass through the filter material layer. In the adsorption process, the micro pore canal of the adsorption filter material such as activated carbon can adsorb organic substances, chlorine, peculiar smell and other harmful substances in water, so that the water quality is better purified.

S6, nanofiltration, namely, enabling the water discharged from the multi-medium filter to enter an SNF membrane system, removing pollutants such as COD, ammonia nitrogen, divalent salt and the like in the wastewater, and enabling the water produced by the SNF membrane system to enter a water producing tank for reaching the standard for recycling. The removal rates of COD, ammonia nitrogen and total phosphorus of the sewage in the SNF membrane system are respectively 60% -70%, 55% -60% and 98% -99%.

According to the zero-emission treatment method for sewage in the filter production line, the oxidizing property (oxidation potential 2.03V) of ozone is utilized to directly oxidize organic matters in water or oxidize and decompose macromolecular organic matters into small molecules, so that the small molecules are easier to degrade. The ozone catalytic oxidation technology is particularly suitable for wastewater treatment with poor biodegradability. The ozone oxidation technology has simple flow, short treatment time, no residue and no secondary pollution.

The application adopts oil removal treatment, coagulation air flotation, softening coagulation, ozone oxidation, filtration, adsorption and nanofiltration. Notably, the method of the present application is particularly applicable to oily wastewater containing zinc, iron, nickel. The method comprises the steps of firstly removing oil drops with the particle size of more than 100 microns from wastewater by oil separation treatment, removing finely dispersed oil with the particle size of 10-100 microns from wastewater by coagulation air floatation, removing residual COD in the wastewater by ozone oxidation, and removing suspended matters in the wastewater and adsorbing the COD in the wastewater by filtration and adsorption, thereby providing a guarantee for a subsequent nanofiltration system, reducing pollutants in the wastewater and guaranteeing that effluent meets design requirements.

The treated effluent meets the standards of process and product water in the water quality of industrial water for urban sewage recycling (GB/T19923-2005).

3. Advantageous effects

Compared with the prior art, the utility model has the beneficial effects that:

(1) The sewage zero-emission treatment device of the filter production line provided by the utility model is provided with the feeding unit, the reaction unit, the filtering unit and the water production unit which are connected in sequence, so that the operation is simple, the daily operation is stable, and the water quality of the water produced by the filter production line can meet the requirement of industrial water quality of urban sewage recycling (GB/T19923-2005);

(2) The utility model is provided with a concentrated water treatment unit, the concentrated water obtained by the SNF membrane component is cooled by a low-temperature evaporation concentrator, and the effluent can be recycled in a factory, thereby achieving the standard of reuse water and realizing zero emission;

(3) The utility model is provided with a sludge treatment unit, the sludge generated in coagulation air flotation and softening coagulation is drained through a plate-and-frame filter press, and the filtered sludge is treated outside the sludge treatment device, so that the post-treatment of pollutants is facilitated.

Drawings

The technical solution of the present utility model will be described in further detail below with reference to the accompanying drawings and examples, but it should be understood that these drawings are designed for the purpose of illustration only and thus are not limiting the scope of the present utility model. Moreover, unless specifically indicated otherwise, the drawings are intended to conceptually illustrate the structural configurations described herein and are not necessarily drawn to scale.

FIG. 1 is a flow chart of a sewage zero release treatment of a filter production line of the present utility model;

FIG. 2 is a schematic diagram of the oil removal unit structure of the present utility model;

FIG. 3 is a schematic diagram of the structure of a reaction unit according to the present utility model;

FIG. 4 is a schematic diagram of a filter unit according to the present utility model;

FIG. 5 is a schematic view of a water producing unit according to the present utility model;

FIG. 6 is a schematic diagram of a sludge treatment unit according to the present utility model;

FIG. 7 is a schematic diagram of a concentrate treatment unit according to the present utility model;

100. The oil removing unit is 110 and an oil separating adjusting tank;

200. The reaction unit comprises a 210, an air floatation tank, a 211, a tank body, a 212, a gas dissolving device, a 2121, a gas dissolving tank, a 2122, an air floatation gas dissolving pump, a 213, a slag scraping device, a 214, a first stirring device, and a 215, and a sludge tank;

220. Softening coagulation tank, 221, reaction tank, 2211, second stirring device, 222, sedimentation tank, 230, ozone catalytic oxidation tank, 231, ozone generator, 232, and internal circulation pump;

300. 310 parts of filter unit, 320 parts of multi-medium filter, 320 parts of raw water barrel, 330 parts of SNF membrane device, 331 parts of SNF booster pump, 332 parts of precision filter, 333 parts of SNF high-pressure pump, 334 parts of SNF membrane component;

400. 410 parts of water producing unit, 411 parts of water producing tank and a reuse water pump;

500. The dosing unit comprises 510 parts of a first dosing tank, 520 parts of a second dosing tank, 530 parts of a third dosing tank, 540 parts of a fourth dosing tank, 550 parts of a fifth dosing tank;

600. the sludge treatment unit comprises 610 parts of a plate-and-frame filter press, 611 parts of an air compressor, 612 parts of a pneumatic diaphragm pump;

700. The device comprises a concentrated water treatment unit 710, a concentrated water bucket, 720, a concentrated water circulating bucket, 730, a low-temperature evaporation concentrator, 740 and a cooling tower.

Detailed Description

The following detailed description of exemplary embodiments of the utility model refers to the accompanying drawings, which form a part hereof, and in which are shown by way of illustration exemplary embodiments in which the utility model may be practiced. While these exemplary embodiments are described in sufficient detail to enable those skilled in the art to practice the utility model, it is to be understood that other embodiments may be realized and that various changes to the utility model may be made without departing from the spirit and scope of the utility model. The following more detailed description of the embodiments of the utility model is not intended to limit the scope of the utility model, as claimed, but is merely illustrative and not limiting of the utility model's features and characteristics in order to set forth the best mode of carrying out the utility model and to sufficiently enable those skilled in the art to practice the utility model. Accordingly, the scope of the utility model is limited only by the attached claims.

The devices in the embodiments of the present utility model are all commercially available products.

In the prior art, biochemical treatment is generally adopted for sewage treatment, but the biochemical treatment depends on the action of microorganisms, the microorganisms are greatly influenced by seasons, and the requirements on environment are high and the operation is unstable. The application aims at the sewage of the filter production line, has high concentration of heavy metals (iron, zinc and nickel), has poisoning effect on microorganisms, influences the sewage treatment effect, and has the advantages of no regeneration of the microorganisms and complex post-treatment process.

The application adopts the procedures of oil separation treatment, coagulation air flotation, softening coagulation, ozone oxidation, filtration, adsorption and nanofiltration for the treatment of sewage in a filter production line, and compared with the prior art, the application adopts a biochemical-free treatment method.

The sewage of the filter production line comprises 34-51 mg/L of oil, 0.043-1.10 mg/L of ammonia nitrogen, 0.18-0.29 mg/L of total phosphorus, 0.21-1.11 mg/L of iron ions, 0.05-0.24 mg/L of zinc ions, less than 0.05mg/L, COD-151 mg/L of nickel ions and 35.1mg/L of five-day biochemical oxygen demand, and firstly, oil drops with the particle size larger than 100nm in the sewage are removed by adopting oil separation treatment, so that the oil drops are prevented from wrapping subsequent pollutants and reagents, and the system treatment load is increased.

Further adding neutralizer, flocculant and coagulant aid, collecting suspended substances and colloid substances in water, and removing suspended substances, finely dispersed oil adsorbed on the suspended substances and partial COD by using the action of dissolved air and water. After these two steps, the oil content in the sewage is substantially removed.

And then, under the action of a softener, a flocculant and a coagulant aid, pollutants such as COD, suspended matters, heavy metals and the like in the wastewater are further precipitated and removed, most heavy metal ions are removed, and the hardness of the water is further reduced.

In order to further reduce the concentration of sewage passing through the nanofiltration membrane, the residual COD is subjected to strong oxidative degradation by ozone, the degraded sewage enters the multi-medium filter 310, the COD in the sewage entering the SNF membrane device 330 is controlled to be less than or equal to 60mg/L, and the influence of the excessive COD content on the nanofiltration membrane is avoided.

The examples are directed to filter production line sewage, the components and parameters of which are shown in table 1:

The examples are directed to filter production line sewage, the components and parameters of which are shown in table 1:

TABLE 1 composition and parameters of Filter production line Sewage

Component (A)	Concentration of
		Suspension of	34~51mg/L
Chemical Oxygen Demand (COD)	80~151mg/L
		Five-day biochemical oxygen demand	35.1mg/L
Ammonia nitrogen	0.043~1.10mg/L
		Total phosphorus	0.18~0.29mg/L
Iron (Fe)	0.21~1.11mg/L
		Zinc alloy	0.05~0.24mg/L
Nickel (Ni)	<0.05mg/L

The utility model is a treatment method aiming at sewage of a filter production line, the components of the sewage are shown in table 1, the sewage of the filter production line is characterized by poor biodegradability, high suspended matter concentration and large hardness, so the utility model aims at the characteristics by selecting a mode of pretreatment and SNF membrane system, and finally the obtained produced water meets the standard requirements of process and product water in urban sewage recycling industrial water quality (GB/T19923-2005).

Example 1

The utility model provides a filter production line sewage zero release processing apparatus, includes deoiling unit 100, reaction unit 200, filtration unit 300, produces water unit 400, dosing unit 500, sludge treatment unit 600 and dense water treatment unit 700, deoiling unit 100, reaction unit 200, filtration unit 300 and produce water unit 400 connect gradually, dosing unit 500 is connected with reaction unit 200 and filtration unit 300 respectively, sludge treatment unit 600 is connected with reaction unit 200 and filtration unit 300 respectively, dense water treatment unit 700 is connected with filtration unit 300 rear end.

The oil removal unit 100 includes an oil removal regulating tank 110, and the oil removal regulating tank 110 is provided with a lift pump for inputting sewage into the reaction unit 200. The oil separation regulating tank 110 is a multi-lattice oil separation regulating tank 110 with rectangular plane, and is provided with a plurality of tank bodies, the side wall of the oil separation regulating tank 110 is provided with water passing holes, and the water passing holes are arranged below the liquid level. The sewage flows between the adjacent oil separation regulating tanks 110 through the water passing holes. The oil separation adjusting tank 110 is used for removing a large volume of suspended matters and oil floating on the surface in sewage, and then is lifted to the air floatation tank 210 for treatment by a lifting pump through a pipeline.

The oil removal unit 100 comprises an oil removal adjusting tank 110, wherein the oil removal adjusting tank 110 is a multi-lattice oil removal adjusting tank 110 with a rectangular plane, a plurality of tank bodies are arranged on the oil removal adjusting tank 110, water passing holes are formed in the side walls of the oil removal adjusting tank 110, and wastewater flows among the oil removal adjusting tanks 110 through the water passing holes.

The reaction unit 200 comprises an air floatation tank 210, a softening coagulation tank 220 and an ozone catalytic oxidation tank 230 which are sequentially connected.

The air floatation tank 210 comprises a tank body 211 and an air dissolving device 212, the air dissolving device 212 comprises an air dissolving tank 2121, an air floatation air dissolving pump 2122 is arranged on a pipeline between the air dissolving tank 2121 and the tank body 211, the air floatation air dissolving pump 2122 pressurizes and introduces the air in the air dissolving tank 2121 into the tank body 211, the air floatation air dissolving pump 2122 is utilized to stir the air and the solution at a high speed, a large number of tiny bubbles are formed, the tiny bubbles are attached to the pollutant formed by coagulation, and the pollutant floats to the surface. Still be equipped with in the air supporting pond 210 and scrape sediment device 213, scrape sediment device 213 includes at least one and scrape the sediment board, it is located the air supporting pond 210 liquid level to scrape the sediment board through drive arrangement operation, will float on the impurity on the surface constantly and scrape to in the sludge impoundment 610 for more the unnecessary suspended solid and the oil content in the deep removal water. The treated sewage overflows from the pipe to the softening and coagulation tank 220. A sludge tank 215 is arranged below the floatation tank 210 and is used for receiving impurities scraped by the scraping plate.

The softening and coagulating tank 220 comprises a reaction tank 221 and a sedimentation tank 222, the reaction tank 221 and the sedimentation tank 222 are isolated by a baffle, water passing holes are formed in the baffle, wastewater flows between the reaction tank 221 and the sedimentation tank 222 through the water passing holes, the sedimentation tank 222 is used for carrying out gravity sedimentation on flocculent precipitate generated by the reaction tank 221, and the lower part of the flocculent precipitate is connected with the sludge tank 215 through a pipeline. The reaction tank 221 is provided with a first stirring device 214 for uniformly mixing the wastewater and the reaction reagent, the sedimentation tank 222 is internally provided with inclined pipes which are parallel to each other, the inclined pipes are preferably made of PP materials, the wastewater and the reaction reagent in the sedimentation tank 222 are partitioned by the inclined pipes, sedimentation accumulation and enrichment are reduced, and sedimentation efficiency is affected. The 2-valence metal ions in the sewage are removed, so that the hardness of the sewage is reduced. The supernatant after the precipitation separation overflows to the ozone catalytic oxidation tank 230 through an overflow weir.

The ozone catalytic oxidation tank 230 is isolated from the sedimentation tank 222 by a baffle, an overflow weir is arranged on the upper portion of the baffle, an ozone generator 231 is arranged in the ozone catalytic oxidation tank 230 and is used for oxidizing and removing organic matters, and residual organic matters in sewage are oxidized by the strong oxidizing property of ozone so as to reach the standard of reuse water. The ozone catalytic oxidation pond 230 is connected with an internal circulation pump 232, circulates through the internal circulation pump 232, and enables ozone and sewage to fully react, so that the treatment efficiency is improved. Finally, the treated sewage enters the filtering unit 300 to be filtered.

The filtering unit 300 comprises a multi-medium filter 310 and an SNF membrane device 330 which are sequentially connected, the multi-medium filter 310 comprises a cylinder body which is sequentially connected, a filter material is arranged in the cylinder body, the filter material can be quartz sand, anthracite, active carbon, magnetite, garnet, porous ceramic, plastic balls and the like, the filtering and the adsorption of micro suspended matters are realized, and the stable operation of a rear-stage treatment system is ensured. In embodiment 1, the multi-medium filter 310 comprises two tanks connected in sequence, wherein the medium in the first tank is quartz sand with different gaps, the medium in the second tank is activated carbon with different meshes, the quartz sand is used for filtering suspended matters in water, and the activated carbon is used for adsorbing organic matters and heavy metals.

The SNF membrane device 330 comprises a precision filter 332 and an SNF membrane module 334, and is used for removing pollutants such as COD, ammonia nitrogen, divalent salt and the like in the wastewater, and the produced water of the SNF membrane system can reach the standard for recycling after entering a produced water tank. The SNF booster pump 331 is disposed in front of the fine filter 332 and is used for boosting the water entering the fine filter 332, and the SNF high-pressure pump 333 is disposed in front of the SNF membrane module 334 and is used for boosting the water entering the SNF membrane module 334.

A raw water bucket 320 is arranged between the multi-medium filter 310 and the SNF membrane device 330, and water after ozone catalytic oxidation is stored. Since the ozone-catalyzed oxidized water needs to pass through the multi-medium filter 310 and the multi-medium filter 310 cannot be directly connected with a subsequent system, a raw water tank 320 is provided for storing the ozone-catalyzed oxidized water. Meanwhile, the effluent of ozone catalytic oxidation needs to stay for a certain time, so that the subsequent inflow water quality is ensured to be stable.

The SNF membrane device 330 is connected with a water production tank 410, and the produced water meeting the recycled water standard is recycled in the production process through a recycled water pump 411.

The dosing unit 500 comprises a plurality of dosing tanks, wherein the dosing tanks comprise a first dosing tank filled with a neutralizing agent, a second dosing tank filled with a flocculating agent, a third dosing tank filled with a coagulant aid, a fourth dosing tank filled with a softening agent, a fourth dosing tank filled with a scale inhibitor and a sixth dosing tank filled with a reducing agent, the first dosing tank is connected with an air floatation tank, the second dosing tank is respectively connected with the air floatation tank 210 and the softening coagulation tank 220, the third dosing tank is respectively connected with the air floatation tank 210 and the softening coagulation tank 220, the fourth dosing tank is connected with the softening coagulation tank 220, the fifth dosing tank and the sixth dosing tank are connected with the SNF membrane device 330, and valves are arranged on dosing pipelines of the dosing tanks for controlling dosing flow.

The sludge treatment unit 600 includes a plate-and-frame filter press 610, wherein the plate-and-frame filter press 620 is connected to the sludge tank 215, and the plate-and-frame filter press 620 filters the sludge to obtain the sludge, which is treated outside the sludge. Furthermore, in the plate and frame filter pressing process, the pneumatic diaphragm pump 612 is driven by the air compressor 611 to realize rapid filter pressing of sludge.

The concentrated water treatment unit 700 includes a concentrated water bucket 710, the concentrated water bucket 710 is connected with the SNF membrane module 334, receives concentrated water treated by the SNF membrane module 334, one end of the concentrated water bucket 710 is connected with the air floatation tank 210, and a part of concentrated water in the concentrated water bucket 710 is introduced into the air floatation tank 210 and is reprocessed by the reaction unit 200 and the filtration unit 300. The other end of the concentrated water bucket 710 is connected with a concentrated water circulation bucket 720, when the system is overloaded and cannot bear the reprocessing of the concentrated water, the concentrated water in the concentrated water bucket 710 is introduced into the concentrated water circulation bucket 720, the concentrated water circulation bucket 720 is sequentially connected with a low-temperature evaporation concentrator 730 and a cooling tower 740, and in the processing process, the concentrated water is cooled by the low-temperature evaporation concentrator 730, salt is precipitated at low temperature, and the temperature is controlled to be about 180 ℃.

Wherein, the air floatation tank 210 is provided with a first stirring device 214, and the reaction tank 221 is provided with a second stirring device 2211 for uniformly mixing reactants;

The floatation tank 210 is provided with an on-line pH meter, and the pH of the wastewater in the reaction unit 200 is controlled to be 7-8.

Example 2

The utility model provides a filter production line sewage zero release processing apparatus, includes deoiling unit 100, reaction unit 200, filtration unit 300, produces water unit 400, dosing unit 500, sludge treatment unit 600 and dense water treatment unit 700, deoiling unit 100, reaction unit 200, filtration unit 300 and produce water unit 400 connect gradually, dosing unit 500 is connected with reaction unit 200 and filtration unit 300 respectively, sludge treatment unit 600 is connected with reaction unit 200 and filtration unit 300 respectively, dense water treatment unit 700 is connected with filtration unit 300 rear end.

The oil removal unit 100 includes an oil removal regulating tank 110, and the oil removal regulating tank 110 is provided with a lift pump for inputting sewage into the reaction unit 200. The oil separation regulating tank 110 is a multi-lattice oil separation regulating tank 110 with rectangular plane, and is provided with a plurality of tank bodies, the side wall of the oil separation regulating tank 110 is provided with water passing holes, and the water passing holes are arranged below the liquid level. The sewage flows between the adjacent oil separation regulating tanks 110 through the water passing holes. The oil separation adjusting tank 110 is used for removing a large volume of suspended matters and oil floating on the surface in sewage, and then is lifted to the air floatation tank 210 for treatment by a lifting pump through a pipeline.

The oil removal unit 100 comprises an oil removal adjusting tank 110, wherein the oil removal adjusting tank 110 is a multi-lattice oil removal adjusting tank 110 with a rectangular plane, a plurality of tank bodies are arranged on the oil removal adjusting tank 110, water passing holes are formed in the side walls of the oil removal adjusting tank 110, and wastewater flows among the oil removal adjusting tanks 110 through the water passing holes.

The reaction unit 200 comprises an air floatation tank 210, a softening coagulation tank 220 and an ozone catalytic oxidation tank 230 which are sequentially connected.

The air floatation tank 210 comprises a tank body 211 and an air dissolving device 212, the air dissolving device 212 comprises an air dissolving tank 2121, an air floatation air dissolving pump 2122 is arranged on a pipeline between the air dissolving tank 2121 and the tank body 211, the air floatation air dissolving pump 2122 pressurizes and introduces the air in the air dissolving tank 2121 into the tank body 211, the air floatation air dissolving pump 2122 is utilized to stir the air and the solution at a high speed, a large number of tiny bubbles are formed, the tiny bubbles are attached to the pollutant formed by coagulation, and the pollutant floats to the surface. Still be equipped with in the air supporting pond 210 and scrape sediment device 213, scrape sediment device 213 includes at least one and scrape the sediment board, it is located the air supporting pond 210 liquid level to scrape the sediment board through drive arrangement operation, will float on the impurity on the surface constantly and scrape to in the sludge impoundment 610 for more the unnecessary suspended solid and the oil content in the deep removal water. The treated sewage overflows from the pipe to the softening and coagulation tank 220. A sludge tank 215 is arranged below the floatation tank 210 and is used for receiving impurities scraped by the scraping plate.

The softening and coagulating tank 220 comprises a reaction tank 221 and a sedimentation tank 222, the reaction tank 221 and the sedimentation tank 222 are isolated by a baffle, water passing holes are formed in the baffle, wastewater flows between the reaction tank 221 and the sedimentation tank 222 through the water passing holes, the sedimentation tank 222 is used for carrying out gravity sedimentation on flocculent precipitate generated by the reaction tank 221, and the lower part of the flocculent precipitate is connected with the sludge tank 215 through a pipeline. The reaction tank 221 is provided with a first stirring device 214 for uniformly mixing the wastewater and the reaction reagent, the sedimentation tank 222 is internally provided with inclined pipes which are parallel to each other, the inclined pipes are preferably made of PP materials, the wastewater and the reaction reagent in the sedimentation tank 222 are partitioned by the inclined pipes, sedimentation accumulation and enrichment are reduced, and sedimentation efficiency is affected. The 2-valence metal ions in the sewage are removed, so that the hardness of the sewage is reduced. The supernatant after the precipitation separation overflows to the ozone catalytic oxidation tank 230 through an overflow weir.

The ozone catalytic oxidation tank 230 is isolated from the sedimentation tank 222 by a baffle, an overflow weir is arranged on the upper portion of the baffle, an ozone generator 231 is arranged in the ozone catalytic oxidation tank 230 and is used for oxidizing and removing organic matters, and residual organic matters in sewage are oxidized by the strong oxidizing property of ozone so as to reach the standard of reuse water. The ozone catalytic oxidation pond 230 is connected with an internal circulation pump 232, circulates through the internal circulation pump 232, and enables ozone and sewage to fully react, so that the treatment efficiency is improved. Finally, the treated sewage enters the filtering unit 300 to be filtered.

The filtering unit 300 comprises a multi-medium filter 310 and an SNF membrane device 330 which are sequentially connected, the multi-medium filter 310 comprises a cylinder body which is sequentially connected, a filter material is arranged in the cylinder body, the filter material can be quartz sand, anthracite, active carbon, magnetite, garnet, porous ceramic, plastic balls and the like, the filtering and the adsorption of micro suspended matters are realized, and the stable operation of a rear-stage treatment system is ensured. In embodiment 1, the multi-medium filter 310 comprises two tanks connected in sequence, wherein the medium in the first tank is quartz sand with different gaps, the medium in the second tank is activated carbon with different meshes, the quartz sand is used for filtering suspended matters in water, and the activated carbon is used for adsorbing organic matters and heavy metals.

The SNF membrane device 330 comprises a precision filter 332 and an SNF membrane module 334, and is used for removing pollutants such as COD, ammonia nitrogen, divalent salt and the like in the wastewater, and the produced water of the SNF membrane system can reach the standard for recycling after entering a produced water tank. The SNF booster pump 331 is disposed in front of the fine filter 332 and is used for boosting the water entering the fine filter 332, and the SNF high-pressure pump 333 is disposed in front of the SNF membrane module 334 and is used for boosting the water entering the SNF membrane module 334.

A raw water bucket 320 is arranged between the multi-medium filter 310 and the SNF membrane device 330, and water after ozone catalytic oxidation is stored. Since the ozone-catalyzed oxidized water needs to pass through the multi-medium filter 310 and the multi-medium filter 310 cannot be directly connected with a subsequent system, a raw water tank 320 is provided for storing the ozone-catalyzed oxidized water. Meanwhile, the effluent of ozone catalytic oxidation needs to stay for a certain time, so that the subsequent inflow water quality is ensured to be stable.

The SNF membrane device 330 is connected with a water production tank 410, and the produced water meeting the recycled water standard is recycled in the production process through a recycled water pump 411.

The dosing unit 500 comprises a plurality of dosing tanks, wherein the dosing tanks comprise a first dosing tank filled with a neutralizing agent, a second dosing tank filled with a flocculating agent, a third dosing tank filled with a coagulant aid, a fourth dosing tank filled with a softening agent, a fourth dosing tank filled with a scale inhibitor and a sixth dosing tank filled with a reducing agent, the first dosing tank is connected with an air floatation tank, the second dosing tank is respectively connected with the air floatation tank 210 and the softening coagulation tank 220, the third dosing tank is respectively connected with the air floatation tank 210 and the softening coagulation tank 220, the fourth dosing tank is connected with the softening coagulation tank 220, the fifth dosing tank and the sixth dosing tank are connected with the SNF membrane device 330, and valves are arranged on dosing pipelines of the dosing tanks for controlling dosing flow.

The sludge treatment unit 600 includes a plate-and-frame filter press 610, wherein the plate-and-frame filter press 620 is connected to the sludge tank 215, and the plate-and-frame filter press 620 filters the sludge to obtain the sludge, which is treated outside the sludge. Furthermore, in the plate and frame filter pressing process, the pneumatic diaphragm pump 612 is driven by the air compressor 611 to realize rapid filter pressing of sludge.

The concentrated water treatment unit 700 includes a concentrated water bucket 710, the concentrated water bucket 710 is connected with the SNF membrane module 334, receives concentrated water treated by the SNF membrane module 334, one end of the concentrated water bucket 710 is connected with the air floatation tank 210, and a part of concentrated water in the concentrated water bucket 710 is introduced into the air floatation tank 210 and is reprocessed by the reaction unit 200 and the filtration unit 300. The other end of the concentrated water bucket 710 is connected with a concentrated water circulation bucket 720, when the system is overloaded and cannot bear the reprocessing of the concentrated water, the concentrated water in the concentrated water bucket 710 is introduced into the concentrated water circulation bucket 720, the concentrated water circulation bucket 720 is sequentially connected with a low-temperature evaporation concentrator 730 and a cooling tower 740, and in the processing process, the concentrated water is cooled by the low-temperature evaporation concentrator 730, salt is precipitated at low temperature, and the temperature is controlled to be about 180 ℃.

Wherein, the air floatation tank 210 is provided with a first stirring device 214, and the reaction tank 221 is provided with a second stirring device 2211 for uniformly mixing reactants;

The floatation tank 210 is provided with an on-line pH meter, and the pH of the wastewater in the reaction unit 200 is controlled to be 7-8.

In the prior art, biochemical treatment is generally adopted for sewage treatment, but the biochemical treatment depends on the action of microorganisms, the microorganisms are greatly influenced by seasons, and the requirements on environment are high and the operation is unstable. The application aims at the sewage of the filter production line, has high concentration of heavy metals (iron, zinc and nickel), has poisoning effect on microorganisms, influences the sewage treatment effect, and has the advantages of no regeneration of the microorganisms and complex post-treatment process.

The application adopts the procedures of oil separation treatment, coagulation air flotation, softening coagulation, ozone oxidation, filtration, adsorption and nanofiltration for the treatment of sewage in a filter production line, and compared with the prior art, the application adopts a biochemical-free treatment method.

The sewage of the filter production line comprises 34-51 mg/L of oil, 0.043-1.10 mg/L of ammonia nitrogen, 0.18-0.29 mg/L of total phosphorus, 0.21-1.11 mg/L of iron ions, 0.05-0.24 mg/L of zinc ions, less than 0.05mg/L, COD-151 mg/L of nickel ions and 35.1mg/L of five-day biochemical oxygen demand, and firstly, oil drops with the particle size larger than 100nm in the sewage are removed by adopting oil separation treatment, so that the oil drops are prevented from wrapping subsequent pollutants and reagents, and the system treatment load is increased.

Further adding neutralizer, flocculant and coagulant aid, collecting suspended substances and colloid substances in water, and removing suspended substances, finely dispersed oil adsorbed on the suspended substances and partial COD by using the action of dissolved air and water. After these two steps, the oil content in the sewage is substantially removed.

And then, under the action of a softener, a flocculant and a coagulant aid, pollutants such as COD, suspended matters, heavy metals and the like in the wastewater are further precipitated and removed, most heavy metal ions are removed, and the hardness of the water is further reduced.

In order to further reduce the concentration of sewage passing through the nanofiltration membrane, the residual COD is subjected to strong oxidative degradation by ozone, the degraded sewage enters the multi-medium filter 310, the COD in the sewage entering the SNF membrane device 330 is controlled to be less than or equal to 60mg/L, and the influence of the excessive COD content on the nanofiltration membrane is avoided.

The agents present in the examples include a neutralizing agent formulated at a mass concentration of 10%;

The mass concentration of the flocculant is 0.1%;

the mass concentration of the coagulant aid is 10%;

The mass concentration of the softener is 10%;

The scale inhibitor is prepared with the mass concentration of 10%, wherein the scale inhibitor comprises an organic polymer, such as a phosphorus-containing small molecular organic polymer;

the mass concentration of the reducing agent is 10%.

Example 3

During operation, the SNF membrane device 330 needs to be cleaned periodically or excessive deposition of pollutants in the device is required, and in order to prevent the pollutants from blocking the membrane and affecting the reaction process, the membrane is cleaned by adopting a scale inhibitor and a reducing agent. During cleaning, the sewage is stopped from being introduced into the SNF membrane device 330, and in the embodiment, the phosphorus-containing organic polymer is used as a scale inhibitor, sodium bisulphite is used as a reducing agent, and the introduction amount of the scale inhibitor and the reducing agent is 1:1.

Claims (7)

1. The sewage zero-emission treatment device for the filter production line is characterized by comprising an oil removal unit (100), a reaction unit (200), a filtering unit (300), a water production unit (400), a dosing unit (500), a sludge treatment unit (600) and a concentrated water treatment unit (700), wherein the oil removal unit (100), the reaction unit (200), the filtering unit (300) and the water production unit (400) are sequentially connected, the dosing unit (500) is respectively connected with the reaction unit (200) and the filtering unit (300), the sludge treatment unit (600) is respectively connected with the reaction unit (200) and the filtering unit (300), and the concentrated water treatment unit (700) is connected with the rear end of the filtering unit (300);

Wherein the reaction unit (200) comprises an air floatation tank (210), a softening coagulation tank (220) and an ozone catalytic oxidation tank (230) which are connected in sequence;

the filtering unit (300) comprises a multi-medium filter (310) and an SNF membrane device (330) which are sequentially connected, the SNF membrane device (330) comprises a precision filter (332) and an SNF membrane assembly (334), an SNF booster pump (331) is arranged in front of the precision filter (332), and an SNF high-pressure pump (333) is arranged in front of the SNF membrane assembly (334);

The concentrated water treatment unit (700) comprises a concentrated water bucket (710), the concentrated water bucket (710) is connected with the filtering unit (300), one end of the concentrated water bucket (710) is connected with the air floatation tank (210), the other end of the concentrated water bucket is connected with the concentrated water circulation bucket (720), and the concentrated water circulation bucket (720) is sequentially connected with the low-temperature evaporation concentrator (730) and the cooling tower (740).

2. The device according to claim 1, characterized in that the oil removal unit (100) comprises an oil removal regulating tank (110), the side wall of the oil removal regulating tank (110) being provided with water passing holes.

3. The device according to claim 1, wherein the air floatation tank (210) comprises a tank body (211) and an air dissolving device (212), the air dissolving device (212) comprises an air dissolving tank (2121) and an air floatation solution pump (2122) connected with the air dissolving tank (2121), and the air dissolving tank (2121) is used for introducing air under the liquid surface of the tank body (211) through the air floatation solution pump (2122).

4. A device according to claim 3, characterized in that a slag scraping device (213) is further arranged in the air floatation tank (210), the slag scraping device (213) comprises at least one slag scraping plate, the slag scraping plate is positioned above the liquid level of the air floatation tank (210), and a sludge tank (610) is arranged below the air floatation tank (210).

5. The device according to claim 1, wherein the softening and coagulating basin (220) comprises a reaction basin (221) and a sedimentation basin (222), the reaction basin (221) and the sedimentation basin (222) are isolated by a baffle plate, water holes are formed in the baffle plate, and the lower part of the sedimentation basin (222) is connected with the sludge treatment unit (600) by a pipeline.

6. The device according to claim 5, wherein an ozone generator (231) is arranged in the ozone catalytic oxidation tank (230), the ozone catalytic oxidation tank (230) and the sedimentation tank (222) are isolated by a baffle, and an overflow weir is arranged at the upper part of the baffle.

7. The apparatus of claim 4, wherein the sludge treatment unit (600) comprises a plate and frame filter press (620), the plate and frame filter press (620) being connected to the sludge basin (610).