Basic technology of sewage treatment in coal chemical industry

Abstract

The invention discloses a coal chemical industry wastewater treatment fundamental technology. The coal chemical industry wastewater treatment fundamental technology comprises the steps of a first-grade wastewater treatment core process, middle assisting, a second-grade wastewater treatment core process and post assisting, controlling is conducted on the pH value based on all processing point water bodies in an overall process, and all parameters are set according to requirements of water inflow and outflow indexes. According to the coal chemical industry wastewater treatment fundamental technology, the advantages of ion separation medicament in practical application for an applicant can be fully guaranteed, and the representative advantages that quantity of reagent (10-300 g per ton of water) is less, dilution is not needed for direct solid state dosage, buffering is not needed for wastewater real-time treatment (the reaction speed ranges from 3 min to 15 min), water content removal rate reaches up to over 80 percent, all national wastewater treatment emission standards can be accorded to and met, and treated water is colorless, odorless and free of secondary harmful chemicals, and sludge produced through flocculation is low in moisture content (smaller than 35 percent), free of odor and adhesion and the like.

Description

technical field [0001] The invention relates to the field of sewage treatment processes and methods, in particular to a basic process and method for sewage treatment in various coal chemical industries. 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 coal chemical wastewater is one of the key industrial wastewater with coal as the basic raw material, which is harmful to the human body and the environment. [0003] The so-called coal chemical i...

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Problems solved by technology

[0012] 5) High chemical oxygen demand (COD): usually COD can be as high as 2,000-5,000mg / L;

[0013] At present, coal chemical wastewater treatment 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. Bacterial domestication and cultivation are difficult, and even some chemical wastewater can kill biochemically active bacteria; this is the reason why my country's urban sewage treatment plants are still powerless to coal chemical wastewater and industrial wastewater despite their large scale

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