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Method for BAME treatment and recycling of printing and dyeing wastewater

A technology for printing and dyeing wastewater and wastewater, applied in textile industry wastewater treatment, multi-stage water treatment, water/sewage treatment, etc. The effect of prolonging the service life and improving the quality of the influent water

Active Publication Date: 2018-11-06
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The membrane separation method has the advantages of small footprint and good effluent quality. It is widely used in the advanced treatment of printing and dyeing wastewater and the reuse of reclaimed water. However, the membrane is easily polluted during operation, and the investment and operation costs are high. At the same time, 30 % of concentrated water, this concentrated water has high salinity (TDS content up to 1.0%), which is not suitable for biochemical treatment, and it is not conducive to the normal operation of the subsequent centralized sewage treatment system after being piped
The adsorption process represented by macroporous resin developed in recent years can also effectively remove residual organic pollutants in biochemical tail water. It is easy to operate, but the removal efficiency of TDS is very low, and it is suitable for the reuse of reclaimed water that does not require high salt content. occasion
The adsorbent after adsorption saturation needs to be regenerated, and the COD concentration of the regenerated solution is as high as 10,000 mg / L, and its biochemical properties are poor, making it difficult to handle
Due to the small amount of regenerated liquid, the enterprise mixes it into the sludge treatment and disposal system, which poses a great potential safety hazard
[0004] The above-mentioned membrane separation and resin adsorption technologies do not reduce the amount of pollutants, but complete the concentration of pollutants, and their wide application is limited

Method used

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  • Method for BAME treatment and recycling of printing and dyeing wastewater

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 1) Printing and dyeing wastewater volume 3000~4000m 3 / d, water COD Cr About 1780~1860mg / L, TDS about 3420~4330mg / L;

[0024] After anaerobic granular sludge hydrolysis and aerobic granular sludge oxidation treatment, the biodegradable pollutants in the wastewater are decomposed by microorganisms. The anaerobic granular sludge load is 1.92~2.40 kgCOD / m 3 d, the load of aerobic granular sludge is 0.3~0.60kgCOD / m 3 d;

[0025] 2) Biological method effluent COD Cr About 120~180mg / L, treated by macroporous weakly basic resin adsorption method, the cross-sectional flow rate of the adsorption bed is 4~6m / h; when the resin reaches adsorption saturation, it is eluted with 3.0% dilute alkali solution, and then washed with water to After neutralization, it can be recycled, and the desorption liquid can be electro-oxidized;

[0026] 3) Effluent COD with low pollutant concentration obtained by resin adsorption method Cr About 80~100mg / L, enter the reverse osmosis membrane pro...

Embodiment 2

[0029] 1) Printing and dyeing wastewater volume 1300~1500m 3 / d, water COD Cr About 780~1050mg / L, TDS about 2760~3130mg / L, first undergo anaerobic granular sludge hydrolysis and aerobic granular sludge oxidation treatment, and decompose biodegradable pollutants in wastewater by microorganisms;

[0030] 2) Biological method effluent CODCr About 93~126mg / L, treated by macroporous weakly basic resin adsorption method, the cross-sectional flow rate of the adsorption bed is 8~10m / h; when the resin reaches adsorption saturation, use 2.0% dilute alkali solution for elution, and then wash with water until After neutralization, it can be recycled, and the desorption liquid can be electro-oxidized;

[0031] 3) Effluent COD with low pollutant concentration obtained by resin adsorption method Cr About 65 ~ 83mg / L, enter the reverse osmosis membrane process, the operating parameters are the same as in Example 1, to obtain fresh water and concentrated water, fresh water COD Cr 32~45mg / L,...

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Abstract

The invention relates to a method for BAME treatment and recycling of printing and dyeing wastewater, and belongs to the technical field of wastewater treatment. The treatment process is as follows: printing and dyeing wastewater is first treated by an A / O granular sludge method to remove easily biodegradable pollutants in the wastewater; then, the wastewater is treated by a resin adsorption method to obtain low-pollutant-concentration effluent and a high-pollutant-concentration desorption solution; the low-pollutant-concentration effluent is further subjected to nanofiltration or reverse osmosis membrane treatment to obtain fresh water and concentrated water; the low-pollutant-concentration effluent obtained by resin adsorption and the fresh water after the membrane treatment can be reused for production or as urban miscellaneous water; and the resin desorption solution and the concentrated water after membrane treatment are mixed and then treated by an electro-oxidation method, organic pollutants, organisms and the like in the mixed wastewater are decomposed by electro-oxidation treatment, and exterior drainage can be used as water for a landscape environment. According to the method provided by the invention, by adopting a BAME system, efficient treatment of printing and dyeing wastewater, pollutant emission reduction and wastewater recycling are realized, and the water quality indexes of fresh water and exterior drainage treated by the method provided by the invention reach a discharge standard respectively.

Description

technical field [0001] The invention belongs to the technical field of waste water treatment, and in particular relates to an energy-saving, high-efficiency and environment-friendly method for BAME treatment and reuse of printing and dyeing waste water. Background technique [0002] With the rapid development of my country's printing and dyeing industry, the discharge of printing and dyeing wastewater is increasing year by year. Printing and dyeing wastewater has the characteristics of large water volume, high chroma, high content of organic matter, and complex pollutant components. At present, the main treatment technologies for printing and dyeing wastewater at home and abroad include coagulation sedimentation, biochemical methods, membrane separation and adsorption methods. Coagulation sedimentation has the characteristics of high treatment efficiency and simple operation, but it needs to add a large amount of chemicals, and at the same time, it will generate a large amo...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F103/30C02F101/30
CPCC02F1/285C02F1/441C02F1/442C02F1/4672C02F1/72C02F3/30C02F9/00C02F2101/308C02F2103/30C02F2301/08C02F2303/16
Inventor 王家德李军潘炳军沈江南戴启洲邹金特
Owner ZHEJIANG UNIV OF TECH
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