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A kind of printing and dyeing wastewater bame treatment and reuse method
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A technology for printing and dyeing wastewater and wastewater, applied in textile industry wastewater treatment, multi-stage water treatment, water/sewage treatment and other directions, can solve the problems of small water volume, unsuitable biochemical treatment, hidden safety hazards, etc., and achieve low-consumption resource treatment, The effect of improving the water quality and prolonging the service life
Active Publication Date: 2021-04-06
ZHEJIANG UNIV OF TECH
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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
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Embodiment 1
[0023]1) Printing and dyeing waste water content 3000 ~ 4000m3 / D, water supply CODCrAbout 1780 ~ 1860mg / L, TDS is about 3420 ~ 4330mg / L;
[0024]First, the anaerobic particulate sludge hydrolysis and aerobic particulate sludge oxidation treatment, biodegradable contaminants in the wastewater in microbial decomposition, the anaerobic particle sludge load is 1.92 ~ 2.40 kgcod / m3· D, good oxygen particulate sludge load is 0.3 ~ 0.60 kgcod / m3· D;
[0025]2) Biological method water CODCrAbout 120 ~ 180mg / L, the treatment is treated by the large pore weakly alkaline resin adsorption method, the adsorption bed cross-section flow rate 4 to 6 m / h; when the resin reaches the adsorption, the elution is performed by 3.0% dilute alkali, and then rinse it. Neutral recycling, detachment of liquid electricity oxidation treatment;
[0026]3) Resin adsorption method obtained with low pollutant concentration of water CODCrAbout 80 ~ 100mg / L, enter the reverse osmosis membrane method, the operati...
Embodiment 2
[0029]1) Printing and dyeing waste water content 1300 ~ 1500m3 / D, water supply CODCrAbout 780 to 1050 mg / L, TDS of about 2760 ~ 3130mg / L, first via anaerobic particle sludge hydrolysis and aerobic particulate sludge oxidation treatment, biodegradable contaminants in wastewater;
[0030]2) Biological method water COD Cr About 93 ~ 126mg / L, the treatment is treated by the large pore weakly alkaline resin adsorption method, adsorbed the bed cross-section flow rate 8 to 10 m / h; when the resin reaches the adsorption, the elution is performed by 2.0% dilute alkali, and then rinse it. Neutral recycling, detachment of liquid electricity oxidation treatment;
[0031] 3) Resin adsorption method obtained with low pollutant concentration of water COD Cr About 65 ~ 83mg / L, enter the reverse osmosis membrane method, the operation parameters are the same as the example one, to get fresh water and concentrated water, fresh water COD Cr 32 ~ 45mg / L, TDS is about 420 ~ 640mg / L, refreshing ...
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Abstract
A method for treating and reusing BAME of printing and dyeing wastewater belongs to the technical field of wastewater treatment. The treatment process is as follows: the printing and dyeing wastewater is first treated by the A / O granular sludge method to remove the easily biodegradable pollutants in the wastewater; then, it is treated by the resin adsorption method to obtain effluent with low pollutant concentration and high pollutant concentration. The effluent with low pollutant concentration is further treated by nanofiltration or reverse osmosis membrane to obtain fresh water and concentrated water; the low pollutant concentration effluent obtained by resin adsorption and fresh water after membrane can be reused for production or urban miscellaneous water; resin desorption The liquid and the concentrated water after the membrane are mixed and treated by electro-oxidation. The organic pollutants and organisms in the mixed wastewater are decomposed by electro-oxidation treatment, and the external drainage can be used as landscape water. By adopting the BAME system, the invention realizes the efficient treatment of printing and dyeing wastewater, the emission reduction of pollutants and the recycling of wastewater, and the water quality indicators of fresh water and external drainage treated by the invention respectively reach the discharge standard.
Description
Technical field[0001]The present invention belongs to the field of wastewater treatment, and therefore, in particular, the present invention relates to an energy saving, efficient, environmentally friendly printing and dyeing waste, BaME treatment and reuse method.Background technique[0002]With the rapid development of my country's printing and dyeing industry, the discharge of printing and dyeing wastewater increased year by year. The printing and dyeing wastewater has the characteristics of high water volume, high chromaticity, high organic matter content, complex pollutant ingredient. At present, the main treatment technique for printing and dyeing waste in China has a concrete precipitation, a biochemical method, a membrane separation, and an adsorption method. The concrete precipitate has the characteristics of high treatment efficiency, simple operation, etc., but it is necessary to invest a large number of pharmaceuticals, while producing a large number of physical chemical s...
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Application Information
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