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Printing and dyeing wastewater treatment process

A treatment process, printing and dyeing wastewater technology, applied in the direction of water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve the problems of high cost, many process steps, long treatment time, etc., to achieve Fewer steps, good precipitation effect, and the effect of improving efficiency

Inactive Publication Date: 2014-05-07
NANTONG HUAXIN ENVIRONMENTAL ENG EQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, most of the treatment of printing and dyeing wastewater has long processing time, many process steps and high cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Water quality indicators: pH value 9~10.5, COD 600 mg / L, BOD 200 mg / L, chroma 300 times.

[0013] Adjust the pH of the wastewater in the adjustment tank to be in the range of 6~8, and after staying for 12 hours, enter the coagulation sedimentation tank, and add flocculant in the coagulation sedimentation tank, the flocculant is porous carbon particles, chitosan and aluminum sulfate according to the mass ratio 1:2:1 mixture, add 8g per 1L of waste water, settle for 5 hours, then enter the hydrolysis tank for acidification and hydrolysis, enter the contact oxidation tank after 3.5 hours, and enter the decolorization treatment tank after 4 hours of contact oxidation, decolorization treatment Effluent after 1.5h; Add decolorizing agent in the described decolorizing treatment tank, the add-on of decolorizing agent is to add 5g in every 1L waste water, described decolorizing agent is that active carbon and zeolite are mixed by mass ratio 1:1, and effluent water quality after p...

Embodiment 2

[0015] Water quality indicators: pH value 10~12, COD 1000 mg / L, BOD 400 mg / L, color 500 times.

[0016] Adjust the pH of the wastewater in the adjustment tank to be in the range of 6~8, and then enter the coagulation sedimentation tank after staying for 24 hours. The flocculant is added to the coagulation sedimentation tank. The flocculant is porous carbon particles, chitosan and basic aluminum chloride According to the mixture with a mass ratio of 3:5:2, the addition amount is 15g per 1L of waste water, precipitate for 3 hours, then enter the hydrolysis tank for acidification and hydrolysis, enter the contact oxidation tank after 3.5 hours, and enter the decolorization treatment tank after 4 hours of contact oxidation , water outlet after decolorization treatment 1.5h; Add decolorant in the described decolorization treatment pool, the add-on of decolorant is to add 5g in every 1L waste water, described decolorant is activated carbon and zeolite mixed by mass ratio 2: 1, handle...

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Abstract

The invention relates to a printing and dyeing wastewater treatment process. The process comprises the following steps: sequentially feeding wastewater into a regulating pond, a coagulative precipitation pond, a hydrolysis pond, a contact oxidation pond and a decolorization treatment pond so as to obtain effluent, namely, regulating the pH (Power of Hydrogen) of the wastewater in the regulating pond to reach 6 to 8 and remaining for 12 to 24 hours; then feeding the wastewater into the coagulative precipitation pond and precipitating for 3 to 5 hours by adding a flocculating agent; feeding the wastewater into the hydrolysis pond and performing acidification hydrolysis for 2 to 5 hours; feeding the wastewater into the contact oxidation pond and performing contact oxidation for 3 to 5 hours; and feeding the wastewater into the decolorization treatment pond and performing decolorization treatment for 1 to 2 hours, thereby obtaining the effluent. A decoloring agent is added into the decolorization treatment pond. After the effluent is precipitated once, the removal rate of COD (Chemical Oxygen Demand) can reach more than 70%; the removal rate of BOD (Biochemical Oxygen Demand) can reach 40% or so. The effluent is acidified and oxidated after entering the hydrolysis pond and the contact oxidation pond; finally, the step of the decolorization treatment to the effluent is added. The effluent after being treated in the decolorization treatment pond can reach the national standard, and can be directly discharged. According to the process, multiple precipitations are not required, i.e., the few steps are needed, so that the cost is greatly saved while the efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, and in particular relates to a printing and dyeing wastewater treatment process. Background technique [0002] While the development of industrial and agricultural production has created rich wealth for human beings, it has also caused varying degrees of harm to the environment, especially the pollution of water resources, which has attracted more and more attention. The industrial wastewater pollutants in different industries are very different, even the content of various substances in the industrial wastewater of different production enterprises in the same industry is also quite different. Therefore, for sewage treatment, targeted treatment methods must be designed according to the actual pollutants in the wastewater. [0003] At present, with the development of the textile industry, more and more textile enterprises produce a large amount of printing and dyeing wastewater. The print...

Claims

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Application Information

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IPC IPC(8): C02F9/14
Inventor 包卫彬张桂林许丽华严美娟秦伟曹彬
Owner NANTONG HUAXIN ENVIRONMENTAL ENG EQUIP
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