Generic chemical industry sewage treatment basic process

Abstract

The invention discloses a generic chemical industry sewage treatment basic process which includes the steps of primary sewage treatment core process, middle assisting, secondary sewage treatment core process and later assisting. In the whole technological process, control is conducted on the basis of the pH values of all process point water bodies, and all parameters can be set according to the requirements for water inlet indexes and water outlet indexes. The following representative characteristics and advantages of ion separation reagents of the applicant in actual application can be sufficiently guaranteed and include that the reagent quantity is small and is 10-300 grams in each tonnage of water, the solid reagent is directly put in without being diluted, sewage is treated in real time without being buffered at a reaction speed of 3-15 min, the removal rate of contents in water bodies reaches up to 80% or higher, the national sewage treatment and emission indexes can be met, processed water is colorless, odorless and free of secondary harmful chemicals, and sludge produced through flocculation is low in water content (smaller than 35%), 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 general 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 chemical industry wastewater is one of the key industrial wastewater, which is harmful to human body and environment. The so-called general chemical industry is an industry that converts and pr...

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Problems solved by technology

[0008] 5) High chemical oxygen demand (COD): usually COD can be as high as 2,000-5,000mg / L;

[0009] At present, the general chemical wastewater treatment mainly uses three technical methods: physical method, chemical method and biological method; the physical method includes 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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