CN211004979U - Advanced treatment system for textile printing and dyeing sewage - Google Patents
Advanced treatment system for textile printing and dyeing sewage Download PDFInfo
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- CN211004979U CN211004979U CN201921485536.1U CN201921485536U CN211004979U CN 211004979 U CN211004979 U CN 211004979U CN 201921485536 U CN201921485536 U CN 201921485536U CN 211004979 U CN211004979 U CN 211004979U
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Abstract
The utility model discloses a textile printing and dyeing sewage advanced treatment system. The treatment system of the utility model comprises a pretreatment tank, a hydrolysis acidification tank, an anaerobic-anoxic-aerobic tank, an MBR membrane tank, an ozone contact oxidation tank and a biological filter which are connected in sequence through pipelines; the pretreatment tank is connected with a water inlet pipe; the ozone contact oxidation tank is connected with O3Oxygen-enriched airA mixed gas generating device; a tail gas recycling device connected through a pipeline is arranged between an aerobic tank and an ozone contact oxidation tank in the anaerobic-anoxic-aerobic tank; the biological filter is connected with a drain pipe. The utility model discloses a textile printing and dyeing sewage advanced treatment system is effectual to getting rid of COD, and processing cost is low, and the water after the processing can directly be arranged outward or carry out the retrieval and utilization as the reuse of reuse.
Description
Technical Field
The utility model relates to a textile printing and dyeing sewage advanced treatment system belongs to sewage treatment technical field.
Background
The water consumption and sewage discharge amount of the textile printing and dyeing industry are large, and the survival and normal production of textile printing and dyeing enterprises are seriously challenged under the current limiting conditions of water resource shortage and increasingly severe ecological environment protection. The sewage of the textile printing and dyeing enterprises is characterized by high pollutant concentration, specifically high COD, high chroma, high suspended matter content and high pH value, and also contains a certain amount of non-biochemical treatment COD, and in addition, the water quality and the water quantity of the sewage discharged by the textile printing and dyeing enterprises in different time periods change greatly, and the treatment difficulty is large. The sewage treatment plant is difficult to treat sewage to the first-grade A discharge standard by investment and construction of textile printing and dyeing enterprises, the investment and operation cost are high, and common textile printing and dyeing enterprises limited by scale cannot input huge cost to carry out sewage direct discharge treatment. Therefore, domestic textile printing and dyeing enterprises are more and more concentrated, and the textile printing and dyeing enterprises are intensively brought into large textile printing and dyeing industrial parks in areas such as the long triangle, the bead triangle and the like, so that a circular economy industrial park is developed, water supply, heat supply and air supply are intensively carried out, and sewage treatment and reclaimed water recycling are intensively carried out to deal with environmental protection and water use pressure.
At present, the textile printing and dyeing sewage treatment systems mainly comprise the following systems:
1) a biochemical treatment system: the method comprises the steps of firstly utilizing a coagulation sedimentation tank to pretreat sewage, then enabling the sewage to enter an active sludge unit or a biomembrane contact oxidation unit such as an anaerobic tank, an anoxic tank and an aerobic tank to be treated, and finally achieving the indirect sewage discharge standard of the printing and dyeing industry. The biochemical treatment system is generally applied to a textile printing and dyeing sewage treatment plant, and the treated sewage also needs to enter a secondary sewage treatment plant for further treatment;
2) MBR membrane enhanced biochemical treatment system: the MBR membrane bioreactor is combined with a biochemical treatment system, and the capacity of the biochemical system for enduring water quality change impact is improved by utilizing the advantages of high volume load, small occupied area, long SRT and the like of the MBR membrane bioreactor, for example: CN 109534598A discloses the treatment system, which is strengthened on the basis of a biochemical treatment system, but can not effectively remove non-biochemical COD in textile dyeing sewage, the treated sewage still has certain chroma and higher COD, and the treated sewage needs to enter a secondary sewage treatment plant for further treatment;
3) biochemical + ozone advanced oxidation processing system: the ozone advanced oxidation treatment system is widely applied to advanced treatment of textile printing and dyeing sewage and is used for decoloring and further removing COD (chemical oxygen demand), but the treatment effect of the existing ozone advanced oxidation treatment system is greatly influenced by factors such as water SS (suspended solid) and ozone adding concentration, so that the ozone adding concentration is high and the treatment cost is high in order to achieve a better removal effect.
In view of the defects of the prior textile printing and dyeing sewage treatment system, a textile printing and dyeing sewage advanced treatment system with better treatment effect and lower treatment cost needs to be developed.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a textile printing and dyeing sewage advanced treatment system.
The utility model adopts the technical proposal that:
a textile printing and dyeing sewage advanced treatment system comprises a pretreatment tank, a hydrolysis acidification tank, an anaerobic-anoxic-aerobic tank, an MBR membrane tank, an ozone contact oxidation tank and a biological filter which are sequentially connected through pipelines; the pretreatment tank is connected with a water inlet pipe; the ozone contact oxidation tank is connected with O3Oxygen-enriched air mixingA gas generating device; said O is3The oxygen-enriched air mixed gas generating device consists of an ozone generator and O3-O2A separation device and an oxygen-enriched air generation device, O3-O2A molecular sieve is arranged in the separation device and is used for separating O generated by the ozone generator3-O2O in the gas mixture3Adsorbed to, O2The oxygen-enriched air generated by the oxygen-enriched air generating device is used for eluting O3-O2Molecular sieve adsorbed O in separation apparatus3To obtain O3-an oxygen-enriched air mixture; a tail gas recycling device connected through a pipeline is arranged between an aerobic tank and an ozone contact oxidation tank in the anaerobic-anoxic-aerobic tank; the biological filter is connected with a drain pipe.
As a further improvement, the pretreatment tank is a coagulation sedimentation tank.
As a further improvement, the anaerobic-anoxic-aerobic tank has a gallery-type structure.
As a further improvement, the anaerobic-anoxic-aerobic tank is formed by sequentially connecting an anaerobic tank, an anoxic tank and an aerobic tank in series, and the volumes of the anaerobic tank, the anoxic tank and the aerobic tank can be adjusted.
As a further improvement, said O3-O2The molecular sieve arranged in the separation device is one of a silicate molecular sieve and an aluminosilicate molecular sieve.
As a further improvement, the biological filter is a biological activated carbon filter or an aeration biological filter.
As a further improvement, the MBR membrane tank is provided with an immersed hollow fiber membrane module.
The utility model has the advantages that: the utility model discloses a textile printing and dyeing sewage advanced treatment system is effectual to getting rid of COD, and processing cost is low, and the water after the processing can directly be arranged outward or carry out the retrieval and utilization as the reuse of reuse.
1) The utility model discloses an O among the textile printing and dyeing sewage advanced treatment system3The oxygen-enriched air mixture generating device can return most of liquid oxygen which is not effectively utilized by the ozone generatorThe utilization rate of the liquid oxygen is greatly improved, the production cost of the ozone is greatly reduced, and finally the treatment cost of the textile printing and dyeing sewage can be effectively reduced (the yield of the ozone produced by the ozone generator is 8-12 percent, namely about 90 percent of the liquid oxygen is not effectively utilized, and O is adopted3The oxygen-enriched air mixed gas generating device can recycle about 60% of liquid oxygen which is not effectively utilized by the ozone generator, so that the utilization rate of the liquid oxygen is greatly improved, and the production cost is greatly reduced);
2) the utility model discloses a textile printing and dyeing sewage advanced treatment system changes over to aerobic tank with ozone contact oxidation pond tail gas and utilizes, because what let in the ozone contact oxidation pond is O3Oxygen-enriched air mixture, so that the concentration of oxygen in the tail gas of the ozone contact oxidation pond is high, and the concentration of oxygen is high>60 percent, can realize high oxygen mass transfer efficiency under the high-concentration COD load condition as an aeration source of the aerobic tank, improves the treatment effect of the aerobic tank and reduces the aeration energy consumption of the aerobic tank;
3) the utility model discloses a textile printing and dyeing sewage advanced treatment system combines anaerobism-oxygen deficiency-good oxygen pond, MBR membrane cisterna, ozone contact oxidation pond and biological filter, can show the content that reduces COD in the sewage, the sewage does not contain SS basically after MBR membrane cisterna treatment, not only can prevent that the aeration head in ozone contact oxidation pond from containing SS because of intaking and blockking up, and can prevent that SS from being oxidized to solubility COD in ozone contact oxidation pond, MBR membrane cisterna and ozone contact oxidation pond combine can exert ozone oxidation's best efficiency, ozone contact oxidation pond can also change the non-biochemical treatment COD in the sewage into biochemical treatment COD, ozone contact oxidation pond and biological filter combine can further reduce the content of COD in the sewage, and can also reduce the input volume of ozone (ozone contact oxidation pond + biological filter compare with the ozone contact oxidation pond of exclusive use, the same COD removal effect is achieved, and the addition amount of ozone is reduced by 30-60 percent);
4) the utility model discloses a textile printing and dyeing sewage advanced treatment system is applied to large-scale textile printing and dyeing garden, can deal with its environmental protection and discharge the demand of stable up to standard and saving running cost. The biochemical effluent quality is influenced by the production change of cotton spinning/chemical fiber products in the textile printing and dyeing park, the biochemical effluent effect can be optimized by adjusting the volume of the anoxic/anaerobic/aerobic tank, and the ozone and the biological filter tank are combined to save the surplus for ozone addition and deal with load impact; the larger the scale of wastewater treatment in the textile printing and dyeing park is, the more remarkable the economic effects of saving liquid oxygen and recycling tail gas are.
Drawings
FIG. 1 is a schematic structural view of the advanced treatment system for textile printing and dyeing wastewater of the present invention.
FIG. 2 is a COD test result chart of the effluent of the aerobic tank and the effluent of the MBR membrane tank in the example.
FIG. 3 is a COD test result chart of the effluent of the ozone contact oxidation tank and the effluent of the biological aerated filter in the example.
Detailed Description
The invention will be further explained and illustrated with reference to specific embodiments.
As shown in fig. 1, a textile printing and dyeing wastewater advanced treatment system comprises a pretreatment tank, a hydrolysis acidification tank, an anaerobic-anoxic-aerobic tank, an MBR membrane tank, an ozone contact oxidation tank and a biological filter which are sequentially connected through pipelines; the pretreatment tank is connected with a water inlet pipe; the ozone contact oxidation tank is connected with O3-an oxygen-enriched air mixture generating device; said O is3The oxygen-enriched air mixed gas generating device consists of an ozone generator and O3-O2A separation device and an oxygen-enriched air generation device, O3-O2A molecular sieve is arranged in the separation device and is used for separating O generated by the ozone generator3-O2O in the gas mixture3Adsorbed to, O2The oxygen-enriched air generated by the oxygen-enriched air generating device is used for eluting O3-O2Molecular sieve adsorbed O in separation apparatus3To obtain O3-an oxygen-enriched air mixture; a tail gas recycling device connected through a pipeline is arranged between an aerobic tank and an ozone contact oxidation tank in the anaerobic-anoxic-aerobic tank; the biological filter is connected with a drain pipe.
Preferably, the pretreatment tank is a coagulation sedimentation tank, and the effect of the coagulation sedimentation tank is to reduce COD, SS and pH value of the sewage.
Preferably, the coagulant added in the coagulating sedimentation tank is compounded by polyferric sulfate and ferrous sulfate, the polyferric sulfate can neutralize alkali in the printing and dyeing textile sewage and reduce the pH value of the sewage, and the ferrous sulfate can remove sulfides in the printing and dyeing textile sewage.
Preferably, the anaerobic-anoxic-aerobic tank has a gallery-type structure, and functions to significantly reduce COD, SS, and pH of the wastewater.
Preferably, the anaerobic-anoxic-aerobic tank is formed by sequentially connecting an anaerobic tank, an anoxic tank and an aerobic tank in series, the volumes of the anaerobic tank, the anoxic tank and the aerobic tank can be adjusted, and the flexibility of the device is greatly improved.
Preferably, an air separation membrane unit is arranged in the oxygen-enriched air generating device and is used for increasing the oxygen content of the air and converting the air into oxygen-enriched air.
Preferably, the oxygen content of the oxygen-enriched air is greater than 25%.
Preferably, said O is3-O2The molecular sieve arranged in the separation device is one of a silicate molecular sieve and an aluminosilicate molecular sieve, and the silicate molecular sieve and the aluminosilicate molecular sieve can selectively adsorb O generated by the ozone generator3-O2O in the gas mixture3Realization of O3And O2Separation of (4).
Preferably, the biological filter is a biological activated carbon filter or an aeration biological filter, and the effect of the biological filter is to further reduce COD and ammonia nitrogen of sewage.
Preferably, the MBR membrane tank is provided with an immersed hollow fiber membrane module.
Note:
O3the operating process of the oxygen-enriched air mixture generating device is as follows:
1) introducing liquid oxygen into an ozone generator to obtain O3-O2Mixing gas;
2) mixing O with3-O2Introducing the mixed gas into O3-O2Separation apparatus, O3-O2The separation device is internally provided withMolecular sieve pair O of3-O2O in the gas mixture3Selective adsorption is carried out, and O2Then the mixture is recycled to the ozone generator through the pipeline and mixed with liquid oxygen for generating O3-O2Mixing gas;
3) introducing air into oxygen-enriched air generator to obtain oxygen-enriched air, and eluting O with oxygen-enriched air3-O2O adsorbed in the separation apparatus3To obtain O3-an oxygen-enriched air mixture.
The advanced treatment method for the textile printing and dyeing sewage, which is used for treating the textile printing and dyeing sewage by adopting the advanced treatment system for the textile printing and dyeing sewage, specifically comprises the following steps:
1) introducing textile printing and dyeing sewage into a pretreatment tank for pretreatment;
2) transferring the effluent of the pretreatment tank into a hydrolysis acidification tank for hydrolysis acidification;
3) transferring the effluent of the hydrolysis acidification tank into an anaerobic-anoxic-aerobic tank, and sequentially performing anaerobic treatment, anoxic treatment and aerobic treatment;
4) transferring the effluent of the anaerobic-anoxic-aerobic tank into an MBR membrane tank, and performing MBR membrane enhanced biochemical treatment and filtration;
5) transferring the effluent of the MBR membrane tank into an ozone contact oxidation tank, and introducing O3Oxygen-enriched air mixture, carrying out contact oxidation,
tail gas generated by the ozone contact oxidation tank is transferred into an aerobic tank in the anaerobic-anoxic-aerobic tank through a tail gas recycling device;
6) and (3) transferring the effluent of the ozone contact oxidation tank into a biological filter for biological filtration, and directly discharging the effluent of the biological filter or recycling the effluent as reclaimed water.
Preferably, the COD of the textile printing and dyeing wastewater in the step 1) is less than or equal to 1500 mg/L.
The invention will be further explained and illustrated with reference to specific embodiments.
Example (b):
sewage treatment:
effluent after enterprise pretreatment directly received by a certain textile printing and dyeing park has characteristic pollutant indexes of 400-500 mg/L COD, 100-200 mg/L SS and 8.5 pH value.
A sewage treatment system:
the selected textile printing and dyeing sewage advanced treatment system comprises a coagulation sedimentation tank, a hydrolysis acidification tank, an anaerobic-anoxic-aerobic tank, an MBR membrane tank (provided with an immersed hollow fiber membrane component), an ozone contact oxidation tank and an aeration biological filter which are sequentially connected through pipelines; the coagulating sedimentation tank is connected with a water inlet pipe; the ozone contact oxidation tank is connected with O3-an oxygen-enriched air mixture generating device; said O is3The oxygen-enriched air mixed gas generating device consists of an ozone generator and O3-O2A separation device and an oxygen-enriched air generation device, O3-O2A silicate molecular sieve is arranged in the separation device and is used for separating O generated by the ozone generator3-O2O in the gas mixture3Adsorbed to, O2The oxygen-enriched air generated by the oxygen-enriched air generating device is used for eluting O3-O2Molecular sieve adsorbed O in separation apparatus3To obtain O3-an oxygen-enriched air mixture; a tail gas recycling device connected through a pipeline is arranged between an aerobic tank and an ozone contact oxidation tank in the anaerobic-anoxic-aerobic tank; the biological aerated filter is connected with a drain pipe.
The sewage treatment step:
and (2) introducing the sewage into a textile printing and dyeing sewage advanced treatment system, continuously operating (operating conditions are coagulant: 30ppm of polymeric ferric sulfate +70ppm of ferrous sulfate, and ozone adding concentration: 30-40 mg/L), monitoring the effluent of each device in the system every day, and obtaining COD test result graphs of the effluent of the aerobic tank and the effluent of the MBR membrane tank through testing, wherein the COD test result graphs of the effluent of the ozone contact oxidation tank and the effluent of the aeration biological filter are shown in figure 2, and the COD test result graphs of the effluent of the ozone contact oxidation tank and the effluent of the aeration biological filter are shown in figure 3.
Tests show that the characteristic pollutant indexes of the effluent of the coagulation sedimentation tank are that COD is 200-400 mg/L and SS is less than 50 mg/L, 5-20% of the COD in the effluent of the coagulation sedimentation tank can be removed by the hydrolysis acidification tank, and the characteristic pollutant indexes of the effluent of the anaerobic-anoxic-aerobic tank are that COD is 80-100 mg/L and SS is 10-15 mg/L, and the characteristic pollutant indexes of the effluent of the membrane tank are that COD is 60-90 mg/L, SS is less than 3 mg/L and ammonia nitrogen is less than 1 mg/L.
As can be seen from the figure 2, the MBR membrane tank further enhances the biochemical treatment effect, the COD of the effluent of the MBR membrane tank is 10-20 mg/L lower than that of the effluent of the aerobic tank, and after the MBR process is adopted, the cleaning rate of the blocked aeration disc for the ozone oxidation process is reduced from 4 months to 1 year.
As can be seen from the graph 3, the COD of the effluent of the ozone contact oxidation tank can be further reduced by 10-15 mg/L after the biofilter is arranged in the ozone oxidation process, the COD of the effluent of the aeration biofilter is about 40 mg/L, the ozone adding concentration is about 30 mg/L, and if the ozone oxidation is adopted to directly remove the effluent to the COD of about 40 mg/L, the ozone adding concentration reaches 60-80 mg/L, which shows that the ozone contact oxidation tank and the biofilter are combined to obviously reduce the ozone adding amount.
The pilot test researches the separation effect of the molecular sieve on ozone/oxygen, the detected and recycled oxygen accounts for about 60% of the volume of the produced gas of the ozone generator, and the oxygen in the ozone mixed gas produced by the ozone generator can be well separated and recycled.
The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be equivalent replacement modes, and all are included in the scope of the present invention.
Claims (7)
1. The utility model provides a textile printing and dyeing sewage advanced treatment system which characterized in that: comprises a pretreatment tank, a hydrolysis acidification tank, an anaerobic-anoxic-aerobic tank, an MBR membrane tank, an ozone contact oxidation tank and a biological filter which are connected in sequence through pipelines; the pretreatment tank is connected with a water inlet pipe; the ozone contact oxidation tank is connected with O3-an oxygen-enriched air mixture generating device; said O is3The oxygen-enriched air mixed gas generating device consists of an ozone generator and O3-O2A separation device and an oxygen-enriched air generation device, O3-O2The separation device is internally provided with moleculesSieve for removing O produced by ozone generator3-O2O in the gas mixture3Adsorbed to, O2The oxygen-enriched air generated by the oxygen-enriched air generating device is used for eluting O3-O2Molecular sieve adsorbed O in separation apparatus3To obtain O3-an oxygen-enriched air mixture; a tail gas recycling device connected through a pipeline is arranged between an aerobic tank and an ozone contact oxidation tank in the anaerobic-anoxic-aerobic tank; the biological filter is connected with a drain pipe.
2. The textile printing and dyeing wastewater advanced treatment system according to claim 1, characterized in that: the pretreatment tank is a coagulating sedimentation tank.
3. The textile printing and dyeing wastewater advanced treatment system according to claim 1 or 2, characterized in that: the anaerobic-anoxic-aerobic pool has a gallery type structure.
4. The textile printing and dyeing wastewater advanced treatment system according to claim 3, characterized in that: the anaerobic-anoxic-aerobic tank is formed by sequentially connecting an anaerobic tank, an anoxic tank and an aerobic tank in series, and the volumes of the anaerobic tank, the anoxic tank and the aerobic tank can be adjusted.
5. The textile printing and dyeing wastewater advanced treatment system according to claim 1 or 2, characterized in that: said O is3-O2The molecular sieve arranged in the separation device is one of a silicate molecular sieve and an aluminosilicate molecular sieve.
6. The textile printing and dyeing wastewater advanced treatment system according to claim 1 or 2, characterized in that: the biological filter is a biological activated carbon filter or an aeration biological filter.
7. The textile printing and dyeing wastewater advanced treatment system according to claim 1 or 2, characterized in that: the MBR membrane tank is provided with an immersed hollow fiber membrane module.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110627315A (en) * | 2019-09-06 | 2019-12-31 | 中信环境技术（广州）有限公司 | Advanced treatment system and method for textile printing and dyeing sewage |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110627315A (en) * | 2019-09-06 | 2019-12-31 | 中信环境技术（广州）有限公司 | Advanced treatment system and method for textile printing and dyeing sewage |
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Effective date of registration: 20210412 Address after: 510600 Chepi Road Huangzhou Industrial Zone, Tianhe District, Guangzhou City, Guangdong Province, 7 buildings and 5 floors Patentee after: CITIC ENVIROTECH (GUANGZHOU ) Co.,Ltd. Address before: 510660 5th floor, building 7, Huangzhou Industrial Zone, chebei Road, Tianhe District, Guangzhou City, Guangdong Province Patentee before: CITIC ENVIROTECH (GUANGZHOU ) Co.,Ltd. Patentee before: CITIC ENVIROTECH (TIANJIN) Co.,Ltd. Patentee before: SICHUAN ZHONGYU ENVIRONMENTAL GOVERNANCE Co.,Ltd. |