Non-biochemical process for treating printing and dyeing wastewater

Abstract

The invention relates to a non-biochemical process for treating printing and dyeing wastewater. The non-biochemical process includes the following steps that a step S1, electro flocculation and air floatation sedimentation are conducted to leachate; a step S2, the leachate after treatment of the step S1 is treated by photolysis and electrochemical reaction; a step S3, the leachate after treatmentof the step S2 is treated by electric field and photocatalytic oxidation reaction, and the non-biochemical process of the leachate is completed after the leachate reaches the standard, and if the leachate fails to meet the requirements, a step S4 is used; and the step S4, the leachate treated in step S3 is treated by electrochemical reduction reaction to complete the non-biochemical treatment of the leachate. The non-biochemical process adopts the new technology and process of electro-optic comprehensive reaction to treat the landfill leachate, which can completely replace the physicochemicaltreatment + biochemical treatment + denitrification currently used, the electric flocculation replaces coagulation, the photolysis and the electrochemistry, and the electric field and the photocatalytic oxidation can completely replace the biochemical treatment, the electrochemical reduction replaces the denitrification, and more importantly, the emission index after the new process treatment is better than the pollution control standard of domestic waste landfill (GB16889-2008).

Description

technical field [0001] The invention relates to a sewage treatment method, in particular to a process for treating printing and dyeing sewage by a non-biological method. 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...

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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