Printing and dyeing wastewater pretreatment method based on anoxic zone phase separation technology

Abstract

The invention relates to a printing and dyeing wastewater pretreatment method based on an anoxic zone phase separation technology. According to the printing and dyeing wastewater pretreatment method, an anoxic zone is divided into a phase I and a phase II, namely a phase for hydrogen production and acid production through fermentation and a methanogenesis phase; an electron donor is provided by organic matters in the wastewater, and dye is effectively decolored in the phase I by using a sulfate reducing process and the reducing capacity of reduzate, namely the sulfide, therefore the biodegradability of the wastewater is improved; and the organic matters can be efficiently removed in the phase II. As an anoxic phase transformation technology in the printing and dyeing wastewater treatment course, the printing and dyeing wastewater pretreatment method is used for providing a two-phase anoxic system and carrying out pretreatment on the printing and dyeing wastewater; the chromaticity and the COD (Chemical Oxygen Demand) removal rates can be effectively increased, the biodegradability of the wastewater can be greatly improved, and the defects that a traditional anoxic process is instable in treatment effect, large in sludge yield and the like are overcome. The printing and dyeing wastewater pretreatment method can be used for effectively removing chromaticity and COD in the printing and dyeing wastewater, the removal rates of the chromaticity and the COD respectively reach more than 95 percent and 60 percent, and the organic loading to subsequent procedures is greatly reduced.

Description

technical field [0001] The invention belongs to the industry of industrial wastewater treatment, and in particular relates to a method for pretreatment of printing and dyeing wastewater based on anaerobic section phase separation technology. Background technique [0002] The printing and dyeing industry is a typical water-intensive industry, which consumes nearly 100 million tons of demineralized water for process every year. Printing and dyeing wastewater mainly contains dyes, slurry, dyeing auxiliaries and fiber impurities, oil agents, acids, alkalis and inorganic salts, etc., with complex components and large discharge volume, high chroma, high alkalinity, high pH, ​​high organic content, Refractory biodegradable substances are many and change greatly, and direct discharge will bring great harm to human health and the living environment, and at the same time cause waste of water resources. It is recognized as one of the most difficult major harmful wastewater to treat. ...

AI Technical Summary

Problems solved by technology

However, since the growth characteristics of these two types of bacteria are very different, and the requirements for environmental conditions are very different, the single-phase anaerobic system cannot make both fermentative bacteria and methanogenic bacteria in the best physiological and ecological environmental conditions, and it is difficult to play their respective roles. Optimum efficiency; In addition, traditional technologies often only focus on the hydrolysis of organic matter, but lack the directional control technology for starch and glucose fermentation hydrogen production

At present, the COD removal rate of the single-phase anaerobic system is 20-40%, and the chroma removal rate is 60-80%. The organic load pressure on the subsequent aerobic stage is still relatively large, and the chroma is difficult to further remove

[0007] With the gradual improvement of national and local standards for printing and dyeing wastewater discharge, the previous recommended process can no longer meet the current wastewater discharge requirements and the requirements of the social and economic environment, and urgently needs to be upgraded.

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