Method for treating waste water by photodecomposition cooperative electrical reaction

Abstract

The invention relates to a method for treating waste water by photodecomposition cooperative electrical reaction. The method for treating the waste water by the photodecomposition cooperative electrical reaction includes the steps that step S1, waste water electrocoagulation and air flotation sedimentation are treated; step S2, waste water treated by the step S1 is treated by photodecomposition cooperative electrochemical reaction; and step S3, the step S2 is repeated for 0-N times, and N is a natural number being greater than or equal to 1. The new technology and process for treating printingand dyeing wastewater by adopting electro-optic comprehensive reaction can completely replace the physicochemical treatment and a biochemical treatment method and denitrification which are currentlyused, the electrocoagulation replaces coagulation, and photodecomposition cooperative electrochemistry replaces the biochemical treatment. The wastewater treated by the process has obvious effect in reducing COD, decoloration, ammonia nitrogen and total nitrogen removal.

Description

technical field [0001] The invention relates to a sewage treatment method, in particular to a method for treating waste water by photolysis and electrical reaction. Background technique [0002] As an important economic industry in my country, the textile printing and dyeing industry will use a large amount of oil, acid, alkali, fiber impurities, inorganic salts, surfactants, pulp, etc. in the process of desizing, scouring, mercerizing, dyeing, printing and washing. materials, dyes and chemical auxiliaries, etc., resulting in not only a large amount of wastewater, but an average of 100-200 tons of water per ton of textile printing and dyeing, 80-90% of which become wastewater, and the quality of wastewater varies greatly, with high concentrations of organic matter, High chroma, high pH and poor biodegradability, it is one of the refractory industrial wastewater. [0003] Since my country is a country seriously short of water resources, the shortage of water resources has beco...

AI Technical Summary

Problems solved by technology

[0006] (2) Apply the design specification of urban sewage treatment to the treatment of printing and dyeing wastewater, only changing some parameters, especially in the early days, the centralized treatment of wastewater from large printing and dyeing factories was all in charge of large design institutes, and due to insufficient understanding of the nature of printing and dyeing wastewater , causing great loss

[0007] (3) New technologies and new processes have not been integrated into the wastewater treatment of the printing and dyeing industry. With the rapid development of environmental protection, a large number of new technologies and new processes of sewage treatment are emerging. A lot of improvements have been made in technology, but they still cannot jump out of the framework of biochemical treatment. This is also an important reason why the wastewater treatment in the printing and dyeing industry is difficult to meet the discharge standards and the reuse rate is low.

[0009] 1. Big investment

[0010] 2. Large area

[0011] 3. Poor control ability, including difficult to control the cultivation and viability of activated sludge bacteria

[0012] 4. The surrounding environment is poor, and a large amount of odorous gas discharged from large-scale sewage pools cannot be treated, causing pollution to the factory area and the surrounding environment

[0013] 5. The large amount of solid waste, especially the large amount of sludge produced by secondary sedimentation, is not only a burden to the unit, but also a great pressure on the solid waste treatment department. For example, incineration will cause chlorine and aromatic hydrocarbons in the sludge. Produces carcinogen dioxins, which can contaminate groundwater if buried deep

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