CN207933226U - A kind of industrial wastewater treatment system - Google Patents

Abstract

An industrial wastewater treatment system with RO concentrated water pretreatment system, deodorization system, accident pool, regulation pool, hydrolysis acidification pool, anoxic pool, aerobic pool, MBBR pool, sedimentation pool, dissolved air flotation pool, ozone contact Each unit of pool, biological aerated filter, filter pool, disinfection monitoring pool, sludge thickening pool, dehydrator, and waste water collection pool is connected by pipelines. The remaining sludge in the sedimentation tank is returned to the anoxic tank and the hydrolytic acidification tank by the pump. The method is particularly effective in treating petrochemical industrial wastewater, and the operation is stable, and the quality of the effluent reaches the national first-class A discharge standard.

Description

An industrial wastewater treatment system

technical field

The utility model relates to a water treatment technology, in particular to an industrial waste water treatment system.

Background technique

With the rapid development of modern industry, the types of industrial wastewater produced by various enterprises in the production process are also different. Due to the increase in consumer demand, the production volume of enterprises has continued to increase, so the amount of industrial wastewater produced has also continued to increase. If the industrial wastewater is not further treated, it will not only cause serious pollution to the environment, but also threaten human health and safety. Since industrial wastewater is mainly composed of hydrocarbons, nitrogen and phosphorus nutrients are insufficient, and the biochemical properties are poor, some metal ions and some refractory substances have strong poisonous and inhibitory effects on microorganisms. There are also various organic and inorganic chemical pollutants and a small amount of dirty oil, high salinity, high suspended solids, high COD and ammonia nitrogen, which are basically wastewater that is difficult to biodegrade, so the industrial wastewater treatment process is relatively complicated.

Contents of the invention

The technical problem to be solved by the utility model is to propose an industrial wastewater treatment system with good effect and stable operation in view of the deficiencies of the prior art.

The technical problem to be solved by the utility model is achieved through the following technical solutions, an industrial wastewater treatment system, which is characterized in that:

There is a regulating pool for normal industrial wastewater flowing through pipelines and an emergency pool for temporary storage of abnormal industrial wastewater, and a dissolved air flotation pool is connected through pipelines between the regulating pool and the emergency pool;

There is a hydrolytic acidification tank, and the industrial wastewater in the regulating tank is transported to the hydrolytic acidification tank by a circulating pump. The hydrolytic acidification tank is equipped with PE material composite packing, and the bottom of the hydrolysis acidification tank is provided with an upflow continuous water inlet pipe, and in the There is a mud discharge pipe at the bottom of the hydrolytic acidification tank;

There is an anoxic pool and an aerobic pool, and the effluent from the hydrolytic acidification pool flows into the anoxic pool through the pipeline, and the industrial wastewater is denitrified in an anoxic environment; the effluent from the anoxic pool flows into the aerobic pool, and a Microporous aerator. Aerobic biological oxidation and nitrification are achieved by blast aeration;

There is a fluidized bed biofilm reactor, the effluent from the aerobic tank flows into the fluidized bed biofilm reactor, and a microporous aerator is installed at the bottom of the fluidized bed biofilm reactor, and the fluidized bed biofilm reacts Biological fluidization filler is added in the tank of the fluidized bed biofilm reactor, and a mud-water mixture reflux pump is installed at the outlet of the fluidized bed biofilm reactor, and a flow meter is installed on the return pipe; the reflux pump returns a part of the mud-water mixture through the branch pipeline. into the anoxic pool;

There is a sedimentation tank, the effluent of the fluidized bed biofilm reactor flows into the sedimentation tank through the pipeline, and the industrial waste cement-water mixture is separated from the solid and liquid in the sedimentation tank, and a mud scraper is installed in the sedimentation tank;

There is a deep dissolved air flotation tank, and the water from the sedimentation tank flows into the deep dissolved air flotation tank through the pipeline.

There is an ozone contact tank, and the water from the deep dissolved air flotation tank flows into the ozone contact tank through pipelines. The ozone contact tank is equipped with an ozone generator, a heat exchanger, and an exhaust gas destruction system. The ozone generated by the ozone generator is added to the ozone contact tank. Full contact with industrial wastewater to oxidize residual organic matter in industrial wastewater;

There is a biological aerated filter, and the effluent from the ozone contact tank flows into the biological aerated filter through the pipeline. The biological aerated filter is filled with a packing layer of ceramsite particles with a high specific surface area to provide a carrier for the growth of microbial film. The lower part of the floor is equipped with a blast aeration system;

There is a filter tank, and the effluent of the biological aerated filter flows into the filter tank through the pipeline;

There is a disinfection monitoring pool, the water from the filter pool flows into the disinfection monitoring pool through the pipeline, and the standard water is discharged into the receiving body through the pump.

The technical problem to be solved by the utility model can be further realized through the following technical scheme, a straight-line pipeline beyond the dissolved air flotation pool is provided between the adjustment pool and the emergency pool.

The technical problem to be solved by the utility model can also be further realized through the following technical solutions. The settling tank is provided with a return well, and part of the remaining sludge at the bottom is returned to the anoxic tank through the pump, and part of it is returned to the regulating tank. The mixed industrial wastewater is pretreated and acidified, and flow meters are installed on the pipelines returning to the regulating tank and the anoxic tank respectively.

The technical problem to be solved by the utility model can be further realized through the following technical solutions. A sludge concentration meter is installed in the hydrolysis acidification tank, and a flow meter is installed on the sludge discharge pipe.

The technical problems to be solved by the utility model can be further realized through the following technical solutions. The deep dissolved air flotation tank is equipped with a first-level flocculation mixer, a second-level flocculation mixer, a third-level flocculation mixer and a dissolved air releaser.

The technical problem to be solved by the utility model can also be further realized through the following technical schemes. An RO concentrated water pretreatment system is provided. The RO concentrated water pretreatment system includes a Fenton oxidation pond and a coagulation sedimentation pond, and the effluent of the Fenton oxidation pond is added with hydrogen oxidation The sodium solution adjusts the pH to neutral and then enters the coagulation sedimentation tank. The effluent separated in the coagulation sedimentation tank is pumped and connected to the adjustment tank; there is a sludge concentration tank, and the sludge settled in the coagulation sedimentation tank is discharged to Sludge thickening tank.

The technical problem to be solved by the utility model can also be further realized through the following technical solutions, a pH adjustment pool is connected to the front end of the Fenton oxidation pool.

The technical problem to be solved by the utility model can be further realized by the following technical solutions. A deodorization system is provided. The deodorization system includes an odor sealing collection system, a gas delivery system, a biological deodorization device and a control system.

Compared with the prior art, the utility model has RO concentrated water pretreatment system, deodorization system, accident pool, regulation pool, hydrolytic acidification pool, anoxic pool, aerobic pool, MBBR pool, sedimentation pool, dissolved air flotation pool , ozone contact tank, biological aerated filter tank, filter tank, disinfection monitoring tank, sludge thickening tank, dehydrator, and waste water collection tank are connected by pipelines. The remaining sludge in the sedimentation tank is pumped back to the anoxic tank and the hydrolytic acidification tank. The method is particularly effective in treating petrochemical industrial wastewater, and the operation is stable, and the quality of the effluent reaches the national first-class A discharge standard.

Description of drawings

Fig. 1 is a structural diagram of the utility model.

Detailed ways

The specific technical solutions of the present invention are further described below, so that those skilled in the art can further understand the present invention, without limiting their rights.

An industrial wastewater treatment system with RO concentrated water pretreatment system, deodorization system, accident pool 2, regulation pool 1, hydrolytic acidification pool 4, anoxic pool 5, aerobic pool 6, MBBR pool 7, sedimentation pool 8, Dissolved air flotation tank 9, ozone contact tank 10, biological aerated filter tank 11, filter tank 12, disinfection monitoring tank 13, sludge concentration tank, dehydrator, and waste water collection tank are connected by pipelines. The remaining sludge in the sedimentation tank is pumped back to the anoxic tank and the hydrolytic acidification tank.

The RO concentrated water inflow flows into the pH adjustment tank at the front end of the Fenton oxidation tank, and is stirred and mixed with the added sulfuric acid solution. After adjusting the pH to acidity, it enters the Fenton reaction tank. The RO concentrated water is stirred and mixed with the added hydrogen peroxide and ferrous sulfate solution. Part of the COD is removed by catalytic oxidation, and the biochemical properties of the concentrated water are improved at the same time. Then the effluent of the Fenton oxidation tank is added with sodium hydroxide solution to adjust the pH to neutral, and then enters the coagulation sedimentation tank, where the flocculant PAC and PAM is mixed for solid-liquid separation of precipitation, and the separated effluent is lifted to the regulating tank by the pump. The settled sludge is discharged to the sludge thickening tank.

Normal industrial wastewater flows into the regulating tank through the pipeline, and the water volume is regulated and the water quality is equalized by the circulating pump. Abnormal industrial wastewater is controlled by a valve and enters the accident pool for temporary storage. If the oil concentration in the accident pool is high, it will be treated by the dissolved air flotation tank first and then flow into the adjustment tank. If the oil concentration is not high, it will be directly sent to the adjustment pool by the pump beyond the dissolved air flotation tank with a small flow rate of 3. After storing water in the accident pool, the wastewater in the accident pool should be treated and transported to the regulating pool as soon as possible under the condition of process production permit, so as to free up space as soon as possible for standby at any time.

The industrial wastewater in the regulating tank is transported to the hydrolysis and acidification tank by the circulating pump. The hydrolysis and acidification tank is equipped with PE material composite filler, the bottom is pierced through the hollow pipe to ascend the flow continuously, and the bottom is equipped with a mud discharge pipe, which can discharge mud intermittently according to the process requirements. The upper horizontal weir discharges water continuously, the hydraulic retention time is 6 hours, the rising flow rate is 0.5-1 m/h, and the sludge age is more than 30 days. Through the metabolism of anaerobic microorganisms in the biofilm combined with suspended sludge and PE material, the refractory organic matter in the process wastewater is hydrolyzed and acidified into simple organic matter that is easy to biodegrade, improving the biodegradability of industrial wastewater and degrading part of the remaining sewage. mud to reduce sludge volume. A sludge concentration meter is installed in the hydrolytic acidification tank, and a flow meter is installed on the sludge discharge pipe. Control the sludge concentration and sludge age by discharging excess sludge, so that the treatment effect can reach the best state. The remaining sludge is discharged to the sludge thickening tank.

The effluent from the hydrolytic acidification tank flows into the anoxic tank through the pipeline. The hydraulic retention time of the anoxic pool is 5 hours, and the sludge age is 20-30 days. Industrial wastewater undergoes denitrification in an oxygen-deficient environment, reducing nitrate nitrogen to nitrogen and escaping into the air. A propeller is installed in the hydrolytic acidification tank to prevent sludge deposition and affect the treatment effect.

The effluent from the anoxic pool flows into the aerobic pool. The hydraulic retention time of the aerobic pool is 10 hours, and the sludge age is 20-30 days. A microporous aerator is installed at the bottom of the pool. Aerobic biological oxidation and nitrification are achieved through blast aeration, organic pollutants are degraded and removed, and ammonia nitrogen is converted into nitrate nitrogen.

The effluent from the aerobic tank flows into the fluidized bed biofilm reactor (ie MBBR tank), the hydraulic retention time of industrial wastewater in the MBBR tank is 6 hours, and the sludge age is 20-30 days. A microporous aerator is installed at the bottom of the pool, and biological fluidized filler is added in the pool to improve the efficiency of aerobic biochemical treatment and the effect of ammonia nitrogen treatment. There is a mud-water mixture return pump at the MBBR outlet, and a flow meter is installed on the return pipe. A part of the mud-water mixture is returned to the anoxic pool by the return pump. By controlling the return flow of mud-water mixture, the nitrate nitrogen index of MBBR effluent is stable and controllable.

The effluent from the MBBR tank flows into the sedimentation tank through the pipeline, the hydraulic retention time is 3 hours, and the mud level is 0.5-2 meters. A mud scraper is installed. The solid-liquid separation of industrial waste cement-water mixture is carried out in the sedimentation tank. The settling tank is also equipped with a return well, and part of the remaining sludge at the bottom is returned to the anoxic tank through the pump, and part of it is returned to the regulating tank, and the mixed industrial wastewater in the regulating tank is pretreated and acidified. Flowmeters are installed on the pipelines of the backflow to the adjustment pool and the anoxic pool respectively, and the treatment effect can reach the best state by controlling the size of each backflow.

The deep dissolved air flotation tank is composed of a mixer, a first-stage flocculation mixer, a second-stage flocculation mixer, a third-stage flocculation mixer, a dissolved air releaser, a slag scraper, an air compressor, a pressure dissolved air tank, a dissolved air water pump, and a scum pump. The effluent from the sedimentation tank flows into the mixing tank of the deep dissolved air flotation tank through the pipeline, and PAC is added to the first-level flocculation tank, and the first-level flocculation mixer is mixed with industrial wastewater. After stirring and mixing with the three-stage flocculation mixer, it goes to the third-stage flocculation tank, and then fully stirs and mixes with the three-stage flocculation mixer in the three-stage flocculation tank before going to the air flotation tank. The air is delivered from the dissolved air pump to the dissolved air releaser, and the air released from the dissolved air releaser is fully mixed with the industrial wastewater. Under the action of the buoyancy of the tiny air bubbles in the dissolved air water, the flocs adhere to the air bubbles and float up, and then pass through the scraping slag. The machine is scraped into the scum tank, and then discharged to the sludge thickening tank by the scum pump.

The effluent from the deep dissolved air flotation tank flows into the ozone contact tank through pipelines, equipped with equipment such as an ozone generator, heat exchanger, and tail gas destruction system. The ozone generated by the ozone generator is added to the ozone contact tank to fully contact with industrial wastewater, and the industrial wastewater Oxidizes the organic matter remaining in the water to improve its biodegradability. If there is excess ozone, the exhaust gas destruction system converts excess ozone into oxygen and discharges it into the air.

The effluent from the ozone contact tank flows into the biological aerated filter through the pipeline. The biological aerated filter is filled with a filler layer of ceramsite particles with a high specific surface area to provide a carrier for microbial film growth. Industrial wastewater flows through the packing layer from bottom to top, and a blower aeration system is installed at the bottom of the packing layer to allow the air to fully contact the industrial wastewater, so that the organic pollutants in the industrial wastewater and the biofilm on the surface of the filler can be degraded through biochemical reactions. It also acts as a physical filter. If the packing layer is clogged and the filterability is not good, it can be backwashed through the backwashing system, and the backwashing water and primary filtration water will flow into the waste water collection tank.

The effluent of the biological aerated filter flows into the filter tank through the pipeline. There are many types of filter tanks, such as active sand filter, fiber turntable filter, D-type filter, V-type filter, and siphon filter. The utility model adopts D-type filter pool. Industrial wastewater is filtered through fiber filter material to remove suspended solids in the water to ensure that the suspended solids in the effluent are discharged up to the standard. If the fiber filter material is clogged and the filterability is not good, it can be backwashed through the backwashing system. The backwash water of the filter tank and the primary filter water flow into the waste water collection tank.

The effluent from the filter tank flows into the disinfection monitoring tank through the pipeline. The advanced disinfection pool for industrial wastewater disinfects the water to be discharged. The disinfection methods include ozone disinfection, chlorine dioxide disinfection, ultraviolet disinfection, etc. What the utility model adopted was chlorine dioxide disinfection. The disinfected water enters the online monitoring pool to monitor the effluent water quality indicators online. After all indicators meet the standards, it is discharged into the receiving body through the pump. When the effluent water quality does not meet the standard, the wastewater in the monitoring pool is transported to the accident pool through the pump, and the whole process is processed again.

The waste water collection tank is mainly used for the initial rainwater in the factory area, the overflow and emptying of pipelines, miscellaneous drainage, and the collection of backwash water and primary filtration water of biological aerated filter and filter tank. The collected water is pumped into the emergency pool. Then enter the processing system for the whole process processing.

The sludge thickening tank collects the sludge from the regulating tank and the hydrolysis acidification tank, and collects the dissolved air flotation scum. They are fully mixed in the sludge thickening tank, and under the action of gravity dehydration and sludge digestion, the moisture content of the sludge is reduced from more than 99% to 97% to 98%, and the volume of the sludge is reduced by 2 to 3 times. Mud dehydration creates conditions.

The sludge in the sludge thickening tank is transported by the sludge pump to the sludge dehydrator, and the sludge dehydrator removes the moisture in the sludge, so that the moisture content of the sludge is less than 80%. The produced sludge is transported to other places for disposal.

The deodorization system, the utility model adopts the biological filter method, which is composed of four parts: the odor sealing collection system, the gas delivery system, the biological deodorization device and the control system. During the sewage treatment process, the unit that produces malodorous gas is collected by the odor sealing collection system, and the malodorous gas is transported to the biological deodorization device by the gas delivery system after collection. The malodorous gas passes through the wet, porous and active microorganism filter layer in the biological deodorization device, and utilizes the characteristics of microorganisms such as small cell size, large surface area, strong adsorption, and various metabolic types to absorb and degrade the malodorous gas substances, and then decomposes them. into carbon dioxide and water and other non-toxic and low-harm substances. The treated gas reaches the standard and enters the exhaust pipe for discharge.

Claims (8)

1. a kind of industrial wastewater treatment system, it is characterised in that：

Equipped with the regulating reservoir and the accident pool that stores of improper industrial wastewater for flowing into normal commercial waste water through pipeline temporarily, adjusting Air-dissolving air-float pond is connected with by pipeline between pond and accident pool；

Equipped with hydrolysis acidification pool, the industrial wastewater in regulating reservoir is transported to hydrolysis acidification pool by circulating pump, is set in hydrolysis acidification pool There are PE material composite fillings, the bottom of hydrolysis acidification pool to wear blank pipe equipped with up-flow continuum micromeehanics, and in hydrolysis acidification pool Bottom of pond is equipped with sludge pipe；

Equipped with anoxic pond and aerobic tank, hydrolysis acidification pool water outlet is flowed into anoxic pond, environment of the industrial wastewater in anoxic through pipeline Lower carry out denitrification；Anoxic pond water outlet flows into aerobic tank, and micro-hole aerator is equipped at aerobic tank bottom；

Aerobe oxidation and nitrification are realized by blast aeration；

Equipped with fluidized bed bio membrane reactor, aerobic tank water outlet is flowed into fluidized bed bio membrane reactor, in fluidized bed bio film The bottom of pond of reactor is equipped with micro-hole aerator, and biological fluidized filler is added in the pond of fluidized bed bio membrane reactor, The water outlet of fluidized bed bio membrane reactor is equipped with muddy water mixed solution reflux pump, and flowmeter is installed on reflux line；Reflux A part of muddy water mixed solution is back in anoxic pond by pump by branch line；

Equipped with sedimentation basin, the water outlet of fluidized bed bio membrane reactor flows into sedimentation basin through pipeline, and industrial wastewater muddy water mixed solution exists Sedimentation basin is separated by solid-liquid separation, and mud scraper is equipped in sedimentation basin；

Equipped with depth air-dissolving air-float pond, sedimentation basin water outlet flows into depth air-dissolving air-float pond through pipeline,

Equipped with ozone contact tank, the water outlet of depth air-dissolving air-float pond flows into ozone contact tank through pipeline, and ozone contact tank is equipped with ozone Generator, heat exchanger and tail gas destroy system, and the ozone generated by ozone generator is added in ozone contact tank and Industry Waste Water comes into full contact with, and is aoxidized to remaining organic matter in industrial wastewater；

Equipped with biological aerated filter, ozone contact tank water outlet flows into biological aerated filter through pipeline, is loaded in biological aerated filter The packing layer for having the haydite particles of high-specific surface area is equipped with air blast to provide the carrier of microbial film growth in packing layer lower part Aerating system；Equipped with filtering ponds, effluent of aeration biological filter flows into filtering ponds through pipeline；

Equipped with sterilization monitor pond, filtering ponds water outlet flows into sterilization monitor pond through pipeline, and water up to standard is discharged by pump in acceptor.

2. industrial wastewater treatment system according to claim 1, it is characterised in that：It is equipped between regulating reservoir and accident pool Surmount the in line pipeline in air-dissolving air-float pond.

3. industrial wastewater treatment system according to claim 1, it is characterised in that：Sedimentation basin is equipped with reflux well, by bottom Excess sludge through pump a part flow back into anoxic pond, a part flows back into regulating reservoir, to the mixing industrial wastewater in regulating reservoir Pretreatment acidification is carried out, flowmeter is installed on flowing back into regulating reservoir and anoxic pond pipeline respectively.

4. industrial wastewater treatment system according to claim 1, it is characterised in that：Sludge is installed dense in hydrolysis acidification pool Degree is counted, and flowmeter is equipped on sludge pipe.

5. industrial wastewater treatment system according to claim 1, it is characterised in that：It wads a quilt with cotton equipped with level-one in depth air-dissolving air-float pond Solidifying blender, two level flocculation stirring machine, three-level flocculation stirring machine and dissolved air release.

6. industrial wastewater treatment system according to claim 1, it is characterised in that：Equipped with RO concentrated water pretreatment systems, RO Concentrated water pretreatment system includes Fenton oxidation pond and coagulative precipitation tank, and sodium hydroxide solution tune is added in the water outlet of Fenton oxidation pond Enter coagulative precipitation tank after saving pH to neutrality, the water outlet after coagulative precipitation tank separation is connected through pump conveying with regulating reservoir；If There is sludge concentration tank, the mud discharging through coagulative precipitation tank precipitation to sludge concentration tank.

7. industrial wastewater treatment system according to claim 6, it is characterised in that：It is connected in Fenton oxidation pond front end PH regulating reservoirs.

8. industrial wastewater treatment system according to claim 1, it is characterised in that：Equipped with deodoration system, deodoration system packet Include foul smell sealing collection system, gas delivery system, biological deodorizing device and control system.