Basic process for sewage treatment in printing and dyeing industry

Abstract

The invention discloses a basic process for sewage treatment in the printing and dyeing industry. The basic process comprises the steps of a front auxiliary process, a core process for primary sewage treatment, an intermediary auxiliary process, a core process for secondary sewage treatment, and a rear auxiliary process. During the whole process, the control is carried out based on the pH values of water at the various process points, and various parameters can be set according to the requirements of influent and effluent water indicators. The basic process provided by the invention can fully guarantee that an ion separation medicine put forward by the applicant has the following representative characteristics and advantages during practical use: the application amount is small (10 to 300 grams per ton of water); the medicine can be directly applied in the solid state without dilution; sewage treatment is carried out in a real-time manner and without temporary storage (the reaction speed ranges from 3 minutes to 15 minutes); the removal rate of water contents reaches above 80 percent; various national sewage treatment and discharge indicators can be satisfied; the treated water is colorless, odorless and non-sticky, contains no secondary harmful chemicals, and achieves a low water content of sludge produced by flocculation (below 35 percent).

Description

technical field [0001] The invention relates to a process and method in the field of sewage treatment, and is specifically embodied as a basic process and method for sewage treatment in the printing and dyeing industry. Background technique [0002] In recent years, with the development of population and economy, environmental problems have become increasingly serious, and our government and people have attached great importance to them. Among them, the problem of water pollution has become a more important problem among many environmental problems. Water pollution causes soil pollution, which in turn causes air pollution and destroys the overall ecological environment. The main sources of water pollution are domestic sewage and industrial sewage, among which industrial sewage bears the brunt, and dyestuff, textile and leather industrial wastewater is one of the key industrial wastewater. The water volume is large and harmful to the human body and the environment. It is the ...

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Problems solved by technology

[0009] At present, the sewage treatment in the printing and dyeing industry mainly uses three technical methods: physical method, chemical method and biological method; among them, physical methods include multi-effect evaporation, ionization, reverse osmosis membrane, ultrafiltration, nanofiltration, etc., which require a large amount of electric energy. In particular, the operation and maintenance cost of membrane technology is quite expensive; and the chemical method is usually to add polymeric oxidants (iron oxide, Fenton, etc.) and chemical flocculants (such as polyacrylamide (PAM) or polyaluminum chloride (PAC) )), etc.; however, chemical flocculants have the disadvantages of large dosage, good water dilution and proportioning, long-term static precipitation, non-stirring, secondary chemical hazardous substances and high water content of sludge, which are unavoidable. There are relatively big problems in the actual process and operation; for example, the flocculation speed is slow, the water flow buffer and reaction supporting facilities occupy a large area, the waste of water resources and land is serious, and the secondary pollution to the water environment is formed. The bigger problem is The use of chemical flocculants will bring great troubles to the sludge treatment it produces. Not only does it require a lot of electric energy to drive the sludge filter press or centrifuge, but also the sludge smells very smelly, and the moisture content of the sludge after treatment remains the same. up to 60%

Biochemical methods are currently widely used, especially in domestic sewage treatment. Its advantages are stability, effectiveness, and low operating costs, but its limitation is that it cannot treat waste water with high concentrations of organic matter and high salt and other poor biodegradability. It is very difficult to domesticate and cultivate bacteria, and even some chemical wastewater can kill biochemically active bacteria; this is the reason why our country’s urban sewage treatment plants are still powerless against landfill leachate and industrial wastewater despite their large scale

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