Basic technology of sewage treatment in starch processing industry

Abstract

The invention discloses a starch processing industry sewage treatment basic process which includes the steps of former assisting, 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 is a process and method related to the field of sewage treatment, and is specifically embodied as a basic process and method of sewage treatment in the starch processing industry. Background technique [0002] In recent years, with the development of population and economy, environmental problems have become more and more serious, and the Chinese government and people have attached great importance to it. Among them, the problem of water pollution has become a key 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, of which industrial sewage bears the brunt, and the starch processing industry sewage is one of the key industrial waste waters with potato or corn as raw materials, which is harmful to humans and the environment. my country is a large agricu...

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Problems solved by technology

[0008] At present, the sewage treatment in the starch processing industry mainly uses three technical methods: physical method, chemical method and biological method; the physical method includes multiple reverse osmosis membranes, ultrafiltration, nanofiltration, etc., and the operation and maintenance costs of membrane technology are 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)) to the water; The shortcomings of large amount, good water dilution and proportioning in advance, long-term static precipitation, non-stirring, generation of secondary chemical hazardous substances and high water content of sludge inevitably have relatively large problems in actual process and operation; For example, the flocculation speed is slow, the water buffer and reaction supporting facilities occupy a large area, the waste of water resources and land is relatively serious, and the secondary pollution to the water environment is caused. The bigger problem is the sludge treatment that will be generated by the use of chemical flocculants. Not only does it require a lot of electricity to drive the sludge filter press or centrifuge, but also the sludge smells very smelly, and the moisture content of the sludge after treatment is still as high as 60% or more

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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