Basic process of sewage treatment in food and aquaculture industry

Abstract

The present invention discloses a basic process for sewage treatment of foodstuff and aquaculture industries. The basic process comprises the steps of front assistance, a primary sewage treatment core process, middle assistance, a secondary sewage treatment core process and rear assistance. The control is performed based on the pH value of a water body of each processing point in the whole process, and each parameter can be set according to the requirement of water inlet and outlet index. According to the basic process disclosed by the present invention, the following representative features and advantages of an ion separation medicament of the applicant in practical applications can be sufficiently ensured: the dosing amount is small (10-300g in each ton of water); the medicament can be directly dosed in solid without dilution; the polluted water treatment is real-time without cache (the reaction rate is 3-15 minutes); the removal rate of matters in a water body reaches as high as 80% or more; and the discharged water can conform to and meet various national sewage treatment discharge targets; the treated water is colorless without odor, and does not contain secondary harmful chemical substances; the sludge produced by coagulation is low in water content (smaller than 35%), is odorless and is not sticky 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 various food and aquaculture sewage treatment. 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 food and aquaculture wastewater is one of the key industrial wastewater, which is harmful to human body and environment. [0003] Based on the differences in production process and output products, food ...

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Problems solved by technology

[0007] 3) High chemical oxygen demand (COD): usually COD can be as high as 1,000-3,000mg / L;

[0008] At present, food and aquaculture wastewater treatment mainly uses three technical methods: physical method, chemical method and biological method; among them, physical method includes various filtration, and the operation and maintenance cost of membrane technology is quite expensive; while chemical method usually involves adding Polymer oxidants (iron oxide, Fenton, etc.) and chemical flocculants (such as polyacrylamide (PAM) or polyaluminum chloride (PAC)); however, chemical flocculants have a large dosage and must be diluted with water in advance. Disadvantages of mixing and proportioning, 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, slow flocculation speed, water buffer And reaction facilities occupy a large area, the waste of water resources and land is relatively serious, and cause secondary pollution to the water environment. The bigger problem is that the use of chemical flocculants will bring great trouble 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 treated sludge 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. Bacteria are difficult to domesticate and cultivate, 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 treat sewage from the food and breeding industries and industrial wastewater despite their large scale.

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