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What are the commonly used sewage treatment agents?
There are three commonly used:

1. Flocculant: sometimes called coagulant, it can be used as a means to strengthen solid-liquid separation, and it can be used in primary sedimentation tank, secondary sedimentation tank, flotation tank, tertiary treatment or advanced treatment.

2. Coagulant aid: Assist flocculant to play a role and strengthen coagulation effect.

3. Conditioner: also known as dehydrating agent, it is used to condition excess sludge before dehydration. The varieties include the above-mentioned flocculants and coagulant AIDS.

Baidu encyclopedia sewage treatment agent