Basic process of desulfurization wastewater treatment

Abstract

The invention discloses a desulfurization wastewater treatment fundamental technology. The desulfurization 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 parameter are set according to requirements of water inflow and outflow indexes. According to the desulfurization 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 the 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, treated water is colorless, odorless and free of secondary harmful chemicals, and the 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 a process and method in the field of desulfurization wastewater treatment, and is embodied in a basic process and method related to desulfurization wastewater 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 flue gas desulfurization wastewater is one of the key industrial wastewater fueled by coal or coal coke, which is harmful to human body and environment. my country is a country domi...

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Problems solved by technology

[0008] 5) High chemical oxygen demand (COD): usually COD can be as high as 5,000-20,000mg / L;

[0009] At present, desulfurization 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, especially The operation and maintenance cost of membrane technology is quite expensive; and the chemical method is usually to add polymer oxidizers (iron oxide, Fenton, etc.) and chemical flocculants (such as polyacrylamide (PAM) or polyaluminum chloride (PAC) ), etc.; however, chemical flocculants have the disadvantages of large dosing amount, good water dilution and proportioning, generation of secondary chemical hazardous substances and high water content of sludge, which inevitably have relatively large differences in actual process and operation. Problems; such as slow flocculation speed, large area of ​​water buffer and reaction supporting facilities, serious waste of water resources and land, secondary pollution to water environment, etc. The bigger problem is the pollution caused by the use of chemical flocculants Sludge treatment brings great troubles. 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 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 with poor biodegradability. It is very difficult to domesticate and cultivate bacteria repeatedly, and even some chemical wastewater can kill biochemically active bacteria; this is also the reason why my country's urban sewage treatment plants are still powerless to landfill leachate and industrial wastewater despite their large scale

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