Views: 10 Author: Site Editor Publish Time: 2019-12-13 Origin: Site
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The abbreviation of biochemical oxygen demand is BOD, which is a comprehensive indicator for showing the oxygen demand of organics and other pollutant in water. Aerobic microorganisms decompose organic matters into inorganic substances at a certain temperature, and it requires some dissolved oxygen in the oxidation process.
Under certain conditions, Chemical Oxygen Demand (COD) is the amount of oxidant consumed when we use strong oxidizer to treat sewage water sample. There are various organic substances in the waste water, which includes nitrites, sulfides, and ferrous salts. But the main pollutant is organic substance. Therefore, chemical oxygen demand is used as an indicator to measure the amount of organic matter in water. The more chemical oxygen demand, and the more serious the water pollution by organic substance.
How to reduce the COD value during wastewater treatment?
1. Physical Method
1) Adsorption method:
Macroporous adsorption resin is a type of polymer adsorption resin with a macroporous structure, but without exchange group. It has a good macroporous network structure and large specific surface area, and can adsorb organics from waste water selectively.
2) Air Flotation Method:
Adsorption bubble separation is called flotation for short. The solids, precipitates, and colloids are adsorbed on the updraft and then separated from the mother liquor. It utilizes the different surface activity of various original dissolved and suspended substances in water.
2. Chemical Method
1) Chemical coagulation method:
The chemical coagulation method utilizes flocculant to clean wastewater.
2) Electrochemical method:
The essence of electrochemical wastewater treatment is use electrolysis to remove pollutants from water, or change toxic substances into non-toxic and low-toxic substances. The electrolytic wastewater treatment can be divided into electrochemical oxidation, electrochemical reduction, and electrical floatation methods base on processing object.
3) Ozone oxidation method:
Ozone is a strong oxidant. It reacts quickly with reduced pollutants. It is easy to be used without secondary pollution. It can be used for disinfection, decolorization, deodorization, removal of organic matter, and reduction of COD during waste water treatment.
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