CN101525202A - Advanced dyeing wastewater treatment and reclaimed water reuse system and method thereof - Google Patents

Abstract

The invention relates to a system and method for advanced treatment of printing and dyeing wastewater and reuse of reclaimed water. The system consists of a regulating tank (2), a coagulation tank (3), a pre-sedimentation tank (4), an acidification hydrolysis tank (5), and a deep well (6 ), degassing tank (7), secondary settling tank (8), biological activated carbon tank (9), sludge thickening tank (10), sludge dewatering tank (11), filter tank (12), ozone oxidation tank (13 ) composition; method: after the wastewater passes through the regulating tank, the coagulation tank and the pre-sedimentation tank, the sludge returns to the coagulation tank, the excess sludge is discharged into the sludge concentration tank, the clarified water flows into the acidification hydrolysis tank, and then enters the deep well aeration tank , enter the secondary sedimentation tank; discharge up to the standard, otherwise flow into the biological activated carbon pool, and be used for production after treatment. The invention has the advantages of simple process, low operating cost, stable reliability, convenient operation, and automatic control; most of the discharged waste water is reused in production after the waste water treatment reaches the standard, which not only reduces the discharge of pollutants, but also eliminates the pollution of waste water to the environment and protects the environment. environment.

Description

A system and method for advanced treatment of printing and dyeing wastewater and reuse of reclaimed water

technical field

The invention belongs to the field of reclaimed water treatment in textile dyeing and finishing, in particular to a system and method for advanced treatment of printing and dyeing wastewater and reuse of reclaimed water.

Background technique

The printing and dyeing industry is an important part of the textile industry. It is not only a key industry to improve product quality and increase product added value, but also an industry that consumes a lot of water, energy, and pollutants. In recent years, driven by the steady and rapid growth of the textile industry, the printing and dyeing industry has developed rapidly, but at the same time it is increasingly constrained by resources and the environment. Printing and dyeing wastewater mainly comes from the two processes of pretreatment and dyeing and printing. It has the characteristics of large water volume, high content of organic pollutants (high COD value), deep color, high alkalinity, and large changes in water quality. It is a difficult-to-treat industrial wastewater. In addition, the dyeing and finishing of textiles also uses a large amount of acids, alkalis, salts, surfactants and various functional finishing agents. These chemicals are bound to cause certain environmental pollution. Therefore, the dyeing and finishing industry is called " According to incomplete statistics, the discharge of printing and dyeing wastewater in China is about 3×10 ⁶ m ³ to 4×10 ⁶ m ³ per day, accounting for about 35% of the entire industrial wastewater. The utilization rate is less than 10%, and more than 90% is discharged as waste water. The resulting ecological and economic losses are immeasurable. In addition, in the areas where the printing and dyeing industry is distributed, especially in places where water resources are relatively scarce, due to the limitation of the total amount of fresh water supplied, the increase in output or the expansion of production scale of printing and dyeing enterprises is restricted, and the development of enterprises is restricted. Therefore, the printing and dyeing industry The work of energy saving and emission reduction is imminent, and it is necessary to increase revenue and reduce expenditure to meet the increased water consumption in the production process.

At present, the advanced treatment and reuse technologies of printing and dyeing wastewater mainly include the following types:

(1) Adsorption method. Activated carbon adsorption is very effective for removing dissolved organic matter in water, but it cannot remove colloids and hydrophobic dyes in water, and it only has good adsorption properties for water-soluble dyes such as cationic dyes, direct dyes, acid dyes, and reactive dyes. Kaolin adsorbent can effectively adsorb yellow direct dye in wastewater. In addition, activated diatomaceous earth and coal cinders are also used in China to treat traditional printing and dyeing process wastewater. The cost is low and the decolorization effect is good. The disadvantage is that the amount of sludge generated is large and the further treatment is difficult.

(2) Oxidation method. The ozone oxidation method is widely used in foreign countries. It can obtain good decolorization effect on most dyes, but it has poor decolorization effect on water-insoluble dyes such as vulcanization, reduction and paint. It is difficult to promote the application. Photooxidation treatment of printing and dyeing wastewater has a high decolorization efficiency, but equipment investment and power consumption need to be further reduced. The use of photosensitized semiconductors as catalysts to treat organic wastewater has become a hot research topic at home and abroad in recent years. Photo-sensitized oxidation mostly uses photo-sensitized semiconductor TiO ₂ to catalyze oxidation to degrade wastewater, which is a new technology for wastewater treatment.

(3) Biological method. Biotechnology is not only used in the secondary treatment of printing and dyeing wastewater, but also can be used as an advanced treatment technology for printing and dyeing wastewater. In view of the low biochemical properties of the pollutants in the secondary effluent and most of them are difficult to biodegrade, many new reactors using bio-enhanced treatment technology have been developed to further reduce the COD and chroma in the secondary effluent. There are mainly biological activated carbon method, biological aerated filter and so on.

(4) Membrane method. Combining different membrane separation technologies (such as microfiltration, ultrafiltration, nanofiltration, reverse osmosis, etc.), or combining membrane separation technologies with other technologies (such as membrane bioreactors), is currently a direction for the advanced treatment of printing and dyeing wastewater . Membrane wastewater reuse mainly includes the process of "ultrafiltration membrane + reverse osmosis membrane". Ultrafiltration is a membrane separation process driven by pressure, which can separate particulate matter from fluid and dissolved components. Applied in the retreatment process of printing and dyeing wastewater, the ultrafiltration membrane not only has a certain removal effect on organic matter and chroma, but also removes impurities such as colloids, bacteria, and viruses that may foul the reverse osmosis membrane, and prolongs the life of reverse osmosis. The cleaning cycle and life of the membrane reduce the overall operating cost; the reverse osmosis membrane can remove 98% of salt ions, completely remove hardness, and also have a very high removal effect on COD and chroma, thereby ensuring the quality of reused water.

Due to the great difference in the quality of wastewater discharged from different fabrics and different printing and dyeing processes, the components and water quality characteristics of wastewater should be analyzed, and the optimal treatment technology should be selected through technical and economic comparison. It is difficult for a single treatment process to treat wastewater up to standard discharge, and a combination of multiple processes is required. There are still some problems in the reuse of printing and dyeing wastewater, such as: a large amount of wastewater reuse will bring a series of problems to the production and sewage treatment system, mainly including the accumulation of organic pollutants and inorganic salts, making the sewage treatment system unable to operate, and the reuse rate is too high High, and without desalination treatment, it will also make production and sewage treatment impossible. Generally, the cost of advanced treatment is higher than that of conventional treatment. It is not suitable for factories with small water consumption, but it shows its advantages for factories with large water consumption, and can bring economic and environmental benefits to enterprises. With the development of new chemical fiber, imitation silk, printing and dyeing finishing technology, polyvinyl alcohol, dyes, new additives and other refractory organic substances enter printing and dyeing wastewater in large quantities, which further reduces the biodegradability of wastewater. These factors also affect wastewater reuse.

Contents of the invention

The technical problem to be solved by the present invention is to provide a system and method for advanced treatment of printing and dyeing wastewater and reclaimed water reuse. Part of it is reused for production, which not only reduces the discharge of pollutants, but also eliminates the pollution of waste water to the environment and protects the environment.

A method for advanced treatment of printing and dyeing wastewater and reuse of reclaimed water according to the present invention, comprising:

Printing and dyeing wastewater first passes through the grid deslagging machine to remove suspended solids with a diameter greater than 1.5mm in the wastewater, and then flows into the regulating tank to adjust the quality and quantity of the wastewater. Then the wastewater is lifted into the coagulation tank with a sewage pump, and inorganic mixing The coagulant ferrous sulfate is stirred by the impeller of the water pump to carry out the coagulation reaction, and is precipitated and separated by the pre-sedimentation tank. Most of the settled sludge is returned to the coagulation tank, and the excess sludge is discharged into the sludge thickening tank. After concentration and dehydration, it is transported outside and clarified The water flows into the acidification hydrolysis tank and mixes with the returning activated sludge. Under anoxic conditions, the facultative microorganisms in the activated sludge acidify and hydrolyze the macromolecular organic matter, and degrade the macromolecular difficult-to-biochemical substances into small molecular biochemical substances. , to improve the biodegradability of wastewater, after acidification and hydrolysis, the mixed liquid flows into the deep well aeration tank, and aerobic biological treatment is carried out on the wastewater; due to the deep well depth, high hydrostatic pressure, and high dissolved oxygen concentration, the wastewater can be quickly and efficiently The organic matter in the sludge is oxidized and degraded into CO ₂ and H ₂ O, turning harmful into harmless. After the deep well treatment fluid flows into the degassing tank to remove the microbubbles adhering to the activated sludge, it enters the secondary sedimentation tank for solid-liquid separation. Most of the settled sludge is returned to the deep well and the acidification hydrolysis tank, and the excess sludge is discharged into the sludge concentration tank, and the sludge is concentrated and dehydrated and transported outside; the clarified water in the secondary settling tank is discharged directly if it meets the standard, otherwise it will flow in with the reused water The bioactive carbon pool, under aerobic conditions, utilizes the degradation effect of activated carbon and microorganisms to remove organic matter in wastewater, and the treated water is filtered, ozone oxidized, sterilized, and further oxidized to remove residual harmful substances before entering the recycling Use the pool, and use the pressurized pump to send the workshop back to production.

The inorganic coagulant is liquid ferrous sulfate (from Changzhou Iron and Steel Works), and the dosage per liter of waste water is 8-10mL.

Wastewater treatment technological process of the present invention is as follows:

The functions of each process equipment are as follows:

1. Grid slag remover;

2. Regulating pool: wastewater water quality and water regulation;

3. Coagulation pool: a coagulation mixer is installed in the pool for the coagulation of waste water, and the coagulant is added under rapid stirring to make it coagulate with the waste water;

4. Pre-sedimentation tank: used for solid-liquid separation of wastewater after coagulation;

5. Acidification and hydrolysis pool: used for pretreated wastewater and microbial acidification and hydrolysis treatment. Aeration pipes are installed in the pool, and a small amount of aeration is used to mix wastewater and activated sludge, and maintain dissolved oxygen in the pool at 0.2mg/L Below, make facultative microorganisms degrade macromolecular organic matter into small molecular organic matter under anoxic conditions, and provide biodegradability of wastewater;

6. Deep well top tank: used to remove waste gas with extremely low oxygen content in deep well circulating fluid;

The auxiliary equipment is a deep well: it is a concentric circular steel structure and adopts the gas circulation operation mode. The compressed air supplied is not only used as the operating power of the deep well, but also provides sufficient high-concentration dissolved oxygen for biological functions. Deep well is the best activated sludge method with less land occupation, good treatment effect, low operating cost, fast and efficient.

7. Degassing tank: Since the deep well is as deep as 100 meters and the hydrostatic pressure is 1MPa, all the compressed air that passes into the deep well is dissolved in the water, and after the circulation reaches the top groove of the deep well, the circulating fluid contains a large amount of supersaturated air, which will release a large amount of air. Micro-bubbles adhere to the activated sludge and make the activated sludge float up. The aeration method is used to remove the micro-bubbles adhering to the sludge, which facilitates the solid-liquid separation of the sludge in the secondary sedimentation tank by gravity method;

8. Secondary sedimentation tank: a sedimentation tank with radial structure, used for solid-liquid separation of deep well treatment fluid

Auxiliary structure: A. A central drive scraper is installed in the pool to collect sedimentation sludge; B. Sludge return pump is used to return the sedimentation sludge from the secondary sedimentation tank to the deep well, acidification hydrolysis tank and sludge concentration tank;

9. Biologically activated carbon pool: The wastewater stays in the pool for 3-5 hours. There is a microporous aerator at the bottom of the pool, and an activated carbon filter layer with a thickness of 2 meters is arranged in the middle of the pool. The residual organic matter in the treated water is activated when it passes through the activated carbon filter layer. Carbon adsorption, enriched on the activated carbon, and the activated carbon is covered with microorganisms at the same time. In the presence of dissolved oxygen, under the synergistic effect of microorganisms and activated carbon, the organic matter in the wastewater can be efficiently removed, improving the removal effect;

10. Sludge concentration tank: used for concentration and dehydration of biochemical excess sludge and pretreatment sludge;

Screw air compressor: aeration and oxygen supply to deep wells;

Low-pressure centrifugal fan: used for aeration of regulating tanks, acidification hydrolysis tanks, degassing tanks, and biologically activated carbon tanks;

Sludge dewatering machine, the sludge produced by wastewater treatment mainly includes biochemical sludge and sludge produced by coagulation and air flotation treatment;

11. Sludge dewatering tank;

12. Filter pool: built-in quartz sand filter material, the treated water passes through the filter layer from top to bottom, the filtration speed is 5-10 m/s, the suspended solids in the treated water are filtered out, and the SS in the treated water is reduced to below 10mg/L ;

13. Ozone oxidation tank: a titanium microporous aerator is arranged at the bottom of the pool, and the ozone is supplied by the ozone generator. Tiny bubbles are released from the titanium microporous aerator to contact the water to be treated, and the ozone-containing air dissolves into the water. Ozone is the strongest oxidant, it can inactivate microorganisms, oxidize and decompose organic matter, remove residual color in wastewater, make water clean, and can be reused for production after treatment;

Ozone generator: The equipment mainly includes air compressors, air dryers, transformers, ozone generators, etc.

Beneficial effect

(1) The method of the present invention has the advantages of simple process, low operating cost, stable and reliable operation, convenient operation and automatic control;

(2) After the waste water treatment of the method of the present invention reaches the standard, most of the discharge is reused in production, so that not only reduces the discharge of pollutants, but also eliminates the pollution of waste water to the environment and protects the environment.

Description of drawings

Fig. 1 is the process flow chart of wastewater treatment; 1 is the grid deslagging machine, 2 is the adjustment tank, 3 is the coagulation tank, 4 is the pre-sedimentation tank, 5 is the acidification hydrolysis tank, 6 is the deep well, 7 is the degassing tank, 8 10 is a sludge concentration tank, 11 is a sludge dewatering tank, 12 is a filter tank, and 13 is an ozone oxidation tank.

Detailed ways

Below in conjunction with specific embodiment, further illustrate the present invention. It should be understood that these examples are only used to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the teachings of the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the appended claims of the present application.

Example 1

The printing and dyeing wastewater advanced treatment and reclaimed water reuse system is characterized in that it consists of a regulating tank (2), a coagulation tank (3), a pre-sedimentation tank (4), an acidification hydrolysis tank (5), a deep well (6), a degassing tank Pool (7), secondary settling tank (8), biologically activated carbon pool (9), sludge thickening tank (10), sludge dehydration tank (11), filter tank (12), and ozone oxidation tank (13).

Regulating pool: wastewater quality and quantity regulation;

Coagulation tank: used for coagulation of waste water, under rapid stirring, add coagulant to make coagulation reaction with waste water;

Pre-sedimentation tank: used for solid-liquid separation of wastewater after coagulation;

Acidification and hydrolysis tank: used for pretreated wastewater and microbial acidification and hydrolysis treatment. Aeration pipes are installed in the tank, and a small amount of aeration is used to mix the wastewater and activated sludge, and maintain the dissolved oxygen in the tank below 0.2mg/L. Make facultative microorganisms degrade macromolecular organic matter into small molecular organic matter under anoxic conditions, and provide biodegradability of wastewater;

Deep well top tank: used to remove waste gas with extremely low oxygen content in deep well circulating fluid;

The auxiliary equipment is a deep well: it is a concentric circular steel structure and adopts the gas circulation operation mode. The compressed air supplied is not only used as the operating power of the deep well, but also provides sufficient high-concentration dissolved oxygen for biological functions. Deep well is the best activated sludge method with less land occupation, good treatment effect, low operating cost, fast and efficient.

Degassing tank: Since the deep well is as deep as 100 meters and the hydrostatic pressure is 1MPa, all the compressed air that enters the deep well is dissolved in the water, and after the circulation reaches the top groove of the deep well, the circulating fluid contains a large amount of supersaturated air, which will release a large number of microbubbles , adhere to the activated sludge and make the activated sludge float. The aeration method is used to remove the micro-bubbles adhering to the sludge, which facilitates the solid-liquid separation of the sludge in the secondary sedimentation tank by gravity method;

Secondary settling tank: a settling tank with radial structure, used for solid-liquid separation of deep well treatment fluid, subsidiary structure: A. Central transmission scraper is installed in the tank to collect sedimentation sludge; B. Sludge return pump is used for Return the settled sludge from the secondary settling tank to the deep well, acidification hydrolysis tank and sludge thickening tank;

Sludge concentration tank: used for concentration and dehydration of biochemical excess sludge and pretreatment sludge;

Screw air compressor: aeration and oxygen supply to deep wells;

Low-pressure centrifugal fan: used for aeration of regulating tanks, acidification hydrolysis tanks, degassing tanks, and biologically activated carbon tanks;

Sludge dewatering machine: The sludge produced by wastewater treatment mainly includes biochemical sludge and sludge produced by coagulation and air flotation treatment;

Biological activated carbon pool: The wastewater stays in the pool for 3 hours. There is a microporous aerator at the bottom of the pool, and an activated carbon filter layer with a thickness of 2 meters is arranged in the middle of the pool. Collected on the activated carbon, the activated carbon is covered with microorganisms at the same time. In the presence of dissolved oxygen, under the synergistic effect of microorganisms and activated carbon, the organic matter in the wastewater can be efficiently removed, improving the removal effect.

Filter tank: Built-in quartz sand filter material, the treated water passes through the filter layer from top to bottom, the filtration speed is 8 m/s, the suspended solids (SS) in the treated water are filtered out, and the SS in the treated water is reduced to 8mg/L;

Ozone oxidation tank: Titanium microporous aerators are arranged at the bottom of the pool. Ozone is supplied by the ozone generator. Tiny bubbles released from the titanium microporous aerators contact the water to be treated, and the ozone-containing air dissolves into the water. Ozone is The strongest oxidant, it can inactivate microorganisms, oxidize and decompose organic matter, remove residual chroma in wastewater, make water clean, and can be reused for production after treatment;

Ozone generator: The equipment mainly includes air compressors, air dryers, transformers, ozone generators, etc.

The 98m ³ /hr printing and dyeing wastewater is first removed by the grid slag remover to remove the suspended solids with a diameter greater than 1.5mm in the wastewater, and then flows into the adjustment tank to adjust the quality and quantity of the wastewater, so that the pH of the wastewater is reduced from 12.5 to 11.1, and the water volume is reduced to 80m ³ / hr, and then use the sewage pump to lift the wastewater into the coagulation tank, and add ferrous sulfate solution (from Changzhou Iron and Steel Works) before the pump. Sedimentation and separation in the settling tank, most of the settled sludge is returned to the coagulation tank, and the excess sludge is discharged into the sludge thickening tank, concentrated and dehydrated, then transported outside, and the clarified water flows into the acidification hydrolysis tank, mixed with the returning activated sludge, and dissolved in the tank When the oxygen is lower than 0.2mg/L, the facultative microorganisms in the activated sludge will acidify and hydrolyze the macromolecular organic matter, degrade the macromolecular difficult-to-biochemical substances into small molecular biochemical substances, improve the biodegradability of wastewater, and after acidification and hydrolysis The mixed liquid flows into the deep well aeration tank for aerobic biological treatment of wastewater; due to the deep well depth, high hydrostatic pressure, and high dissolved oxygen concentration, the organic matter in the wastewater can be oxidized and degraded into CO ₂ and H ₂ quickly and efficiently O, turning harmful into harmless, the deep well treatment fluid flows into the degassing tank to remove the microbubbles attached to the activated sludge, and then enters the secondary settling tank for solid-liquid separation, most of the settled sludge is returned to the deep well, acidified and hydrolyzed The excess sludge is discharged into the sludge concentration tank, and the sludge is concentrated and dehydrated and transported outside; the clarified water in the secondary settling tank is discharged directly if it meets the standard, otherwise it will flow into the biological activated carbon pool together with the reused water, and stay for 3 hours. Under certain conditions, the degradation of activated carbon and microorganisms is used to remove the organic matter in the wastewater, and the treated water is filtered, ozone oxidized, disinfected and sterilized, and after further oxidation to remove the remaining harmful substances, it is put into the reuse pool and pumped by pressurized water. The workshop is reused for production.

After adopting this invention, the various water quality indicators of printing and dyeing wastewater inflow and outflow are as shown in Table 1:

Table 1 Wastewater treatment effect table

project Water intake index Water output index CODcr (mg/L) 2000 38 BOD5(mg/L) 750 4 Suspended solid SS(mg/L) 500 8 Total Phosphorus 5.1 0.39 Ammonia nitrogen 5.35 0.25 Chroma (times) 600 4 pH 12.5 8.5

Example 2

The printing and dyeing wastewater advanced treatment and reclaimed water reuse system is characterized in that it consists of a regulating tank (2), a coagulation tank (3), a pre-sedimentation tank (4), an acidification hydrolysis tank (5), a deep well (6), a degassing tank Pool (7), secondary settling tank (8), biologically activated carbon pool (9), sludge thickening tank (10), sludge dehydration tank (11), filter tank (12), and ozone oxidation tank (13).

Regulating pool: wastewater quality and quantity regulation;

Coagulation tank: used for coagulation of wastewater dosing;

Pre-sedimentation tank: used for solid-liquid separation of wastewater after coagulation;

Acidification and hydrolysis tank: used for pretreated wastewater and microbial acidification and hydrolysis treatment. Aeration pipes are installed in the tank, and a small amount of aeration is used to mix wastewater and activated sludge, and maintain dissolved oxygen in the tank below 0.2mg/L, so that Facultative microorganisms degrade macromolecular organic matter into small molecular organic matter under anoxic conditions, providing biodegradability of wastewater;

Deep well top tank: used to remove waste gas with extremely low oxygen content in deep well circulating fluid;

Degassing tank: The aeration method is used to remove the micro-bubbles adhering to the sludge, which facilitates the solid-liquid separation of the sludge in the secondary sedimentation tank by gravity method;

Secondary settling tank: a settling tank with radial structure, used for solid-liquid separation of deep well treatment fluid, auxiliary equipment: A. Central drive mud scraper is installed in the tank to collect sedimentation sludge, B. Sludge return pump is used for Return the settled sludge from the secondary settling tank to the deep well, acidification hydrolysis tank and sludge thickening tank;

Sludge concentration tank: used for concentration and dehydration of biochemical excess sludge and pretreatment sludge;

Screw air compressor: aeration and oxygen supply to deep wells;

Low-pressure centrifugal fan: used for aeration of regulating tanks, acidification hydrolysis tanks, degassing tanks, and biologically activated carbon tanks;

Sludge dewatering machine: sludge dehydration, the sludge produced by wastewater treatment mainly includes biochemical sludge and sludge produced by coagulation and air flotation treatment;

Biological activated carbon pool: Wastewater stays in the pool for 4 hours. There is a microporous aerator at the bottom of the pool, and an activated carbon filter layer with a thickness of 2 meters is arranged in the middle of the pool to treat residual organic matter in the water. When it passes through the activated carbon filter layer, it is adsorbed by activated carbon. Enriched on the activated carbon, the activated carbon is covered with microorganisms at the same time, in the presence of dissolved oxygen, under the synergistic effect of microorganisms and activated carbon, the organic matter in the wastewater can be efficiently removed, improving the removal effect;

Filter tank: Built-in quartz sand filter material, the treated water passes through the filter layer from top to bottom, the filtration speed is 6 m/s, the suspended solids (SS) in the treated water are filtered out, and the SS in the treated water is reduced to 7mg/L;

Ozone oxidation tank: Titanium microporous aerators are arranged at the bottom of the pool. Ozone is supplied by the ozone generator. Tiny bubbles are released from the titanium microporous aerators to contact with the water to be treated. The ozone-containing air dissolves into the water, and microorganisms Inactivation, oxidative decomposition of organic matter, removal of residual chroma in wastewater, making water clean, and can be reused for production after treatment;

Ozone generator: The equipment mainly includes air compressors, air dryers, transformers, ozone generators, etc.

The 103m ³ /hr printing and dyeing wastewater is first removed by the grid slag remover to remove the suspended solids with a diameter greater than 1.5mm in the wastewater, and then flows into the adjustment tank to adjust the quality and quantity of the wastewater, so that the pH of the wastewater is reduced from 12.1 to 10.8, and the water volume is reduced to 85m ³ / hr, then use the sewage pump to lift the wastewater into the coagulation tank, and add ferrous sulfate liquid (from Changzhou Iron and Steel Works) before the pump, the amount of wastewater per liter is 9mL, and the coagulation reaction is carried out by stirring with the impeller of the water pump; Sedimentation and separation in the settling tank, most of the settled sludge is returned to the coagulation tank, and the excess sludge is discharged into the sludge thickening tank, concentrated and dehydrated, then transported outside, and the clarified water flows into the acidification hydrolysis tank, mixed with the returning activated sludge, and dissolved in the tank When the oxygen is lower than 0.2mg/L, the facultative microorganisms in the activated sludge will acidify and hydrolyze the macromolecular organic matter, degrade the macromolecular difficult-to-biochemical substances into small molecular biochemical substances, improve the biodegradability of wastewater, and acidify and hydrolyze Afterwards, the mixed liquid flows into the deep well aeration tank for aerobic biological treatment of the wastewater; due to the deep well depth, high hydrostatic pressure, and high dissolved oxygen concentration, the organic matter in the wastewater can be quickly and efficiently oxidized and degraded into CO ₂ , H ₂ O, the deep well treatment fluid flows into the degassing tank to remove microbubbles attached to the activated sludge, and then enters the secondary settling tank for solid-liquid separation. Discharge into the sludge concentration tank, concentrate and dehydrate the sludge and transport it outside; the clarified water in the secondary sedimentation tank will be discharged directly if it meets the standard, otherwise it will flow into the biological activated carbon pool together with the reused water, and stay for 4 hours. Under aerobic conditions, use activated carbon Degradation with microorganisms removes organic matter in wastewater, and the treated water is filtered, ozone oxidized, sterilized, and further oxidized to remove residual harmful substances. .

After adopting this invention, the various water quality indexes of printing and dyeing wastewater inflow and outflow are as shown in Table 2:

Table 2 Wastewater Treatment Effect Table

project Water intake index Water output index CODcr(mg/L) 2108 32 BOD5(mg/L) 785 3 Suspended matter SS(mg/L) 632 7 Total phosphorus (mg/L) 4.7 0.24 Ammonia nitrogen (mg/L) 4.58 0.13 Chromaticity (times) 512 2 pH 12.1 8.2

Claims (11)

1. A printing and dyeing wastewater advanced treatment and reclaimed water system is characterized in that: by adjusting tank (2), coagulation tank (3), pre-sedimentation tank (4), acidification hydrolysis tank (5), deep well (6 ), degassing tank (7), secondary sedimentation tank (8), biological activated carbon tank (9), sludge thickening tank (10), sludge dewatering tank (11), filter tank (12), ozone oxidation tank ( 13) Composition. 2. A printing and dyeing wastewater advanced treatment and reclaimed water system according to claim 1, characterized in that: the coagulation tank is a rectangular reinforced concrete structure, two coagulation mixers are installed in the tank, and the coagulation tank is quickly stirred , add coagulant to make coagulation reaction with wastewater. 3. A kind of printing and dyeing wastewater advanced treatment and reclaimed water reuse system according to claim 1, characterized in that: an aeration pipe is installed in the acidification hydrolysis pool, and a small amount of aeration method is used to make the waste water and activated sludge Mix and maintain the dissolved oxygen in the pool below 0.2mg/L. 4. A printing and dyeing wastewater advanced treatment and reclaimed water reuse system according to claim 1, characterized in that: said deep well is a concentric circular steel structure and adopts a gas circulation operation mode. 5. A printing and dyeing wastewater advanced treatment and reclaimed water reuse system according to claim 1, characterized in that: a central drive sludge scraper and a sludge return pump are installed in the secondary settling tank. 6. A printing and dyeing wastewater advanced treatment and reclaimed water reuse system according to claim 1, characterized in that: said deep well aeration tank uses a screw air compressor to aerate and supply oxygen to the deep well. 7. A printing and dyeing wastewater advanced treatment and reclaimed water reuse system according to claim 1, characterized in that: the biologically activated carbon pool: the wastewater stays in the pool for 3-5 hours, and there are micropores for aeration at the bottom of the pool An activated carbon filter layer with a thickness of 2 meters is arranged in the middle of the pool. When the residual organic matter in the treated water passes through the activated carbon filter layer, it is absorbed by the activated carbon and enriched on the activated carbon. At the same time, the activated carbon is covered with microorganisms. In the presence of dissolved oxygen Under normal circumstances, under the synergistic effect of microorganisms and activated carbon, organic matter in wastewater can be efficiently removed. 8. A printing and dyeing wastewater advanced treatment and reclaimed water reuse system according to claim 1, characterized in that: the filter tank is equipped with quartz sand filter material, and the treated water passes through the filter layer from top to bottom. 5-10 m/s, filter to remove suspended solids (SS) in the treated water, and reduce the SS in the treated water to 10mg/L. 9. A method for advanced treatment of printing and dyeing wastewater and reuse of reclaimed water according to claim 1, characterized in that: the ozone oxidation pool: a titanium microporous aerator is arranged at the bottom of the pool, and the ozone is supplied by an ozone generator , Tiny air bubbles released from the titanium microporous aerator contact the water to be treated, and the ozone-containing air dissolves into the water. 10. A method for advanced treatment of printing and dyeing wastewater and reclaimed water, comprising: Printing and dyeing wastewater first passes through the grid deslagging machine to remove suspended solids with a diameter greater than 1.5mm in the wastewater, and then flows into the regulating tank to adjust the quality and quantity of the wastewater. Then the wastewater is lifted into the coagulation tank with a sewage pump, and inorganic mixing Coagulant, stirring for coagulation reaction, sedimentation and separation in the pre-sedimentation tank, most of the settled sludge is returned to the coagulation tank, and the excess sludge is discharged into the sludge concentration tank, concentrated and dehydrated, then exported, and the clarified water flows into the acidification hydrolysis tank. Mixed with the returning activated sludge, under anaerobic conditions, the facultative microorganisms in the activated sludge acidify and hydrolyze the macromolecular organic matter, after the acidification and hydrolysis, the mixed liquid flows into the deep well aeration tank for aerobic biological treatment of the wastewater ;The deep well treatment fluid flows into the degassing tank to remove the microbubbles attached to the activated sludge, and then enters the secondary settling tank for solid-liquid separation. Most of the settled sludge returns to the deep well and acidification hydrolysis tank, and the excess sludge is discharged into Sludge concentration tank, after concentration and dehydration, the sludge is transported outside; the clarified water in the secondary sedimentation tank will be discharged directly if it reaches the standard, otherwise it will flow into the biological activated carbon pool together with the reused water, and the organic matter in the wastewater will be removed under aerobic conditions. The water is then filtered through the filter tank, ozone oxidized in the ozone oxidation tank, disinfected and sterilized, and further oxidized to remove the residual harmful substances, and then enters the reuse pool, and is sent to the workshop by a pressurized pump for reuse in production. 11. A method for advanced treatment of printing and dyeing wastewater and reuse of reclaimed water according to claim 10, characterized in that: the inorganic coagulant is liquid ferrous sulfate, and the dosage per liter of wastewater is 8-10mL.

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