PAC is a commonly used inorganic salt coagulant. It is a polyaluminum chloride product with a molecular weight of 1.5-9 million. The role of polyaluminum chloride is accomplished through its or its hydrolyzed product's compressed electric double layer, electrical neutralization, web trapping, and adsorption bridging. The particulate matter that can be oxidized by the oxidant to cause COD is precipitated and filtered out, thereby reducing COD, the precipitation of particulate matter, and undoubtedly reducing the ss. The so-called BOD refers to the amount of oxygen required when the organic matter in the water is decomposed by aerobic microorganisms. , It reflects the amount of biodegradable organic matter in water under aerobic conditions. If these organics are removed by precipitation, BOD will decrease. 

The polyacrylamide PAM is a high-fraction flocculant, and the organic polymer flocculant has a huge surface adsorption effect caused by the formation of larger flocs between particles. The principle of reducing various indicators in the water is the same as above.

Any water treatment method has limitations, that is to say, it is not necessary to use flocculants and coagulants to reduce the various indicators in the water. If all the organic substances in the water are dissolved, they will not become colloids, and the organic matter will not be granular. When the form exists, adding flocculant and coagulant has little effect.

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