Next up is the primary sedimentation tank, where sludge settles to the bottom and lighter liquids like grease, oil and soap rise to the top.
下一步就是一级沉淀池，污泥沉淀到底部，轻质液体例如油脂、油和皂类浮到上面。
Firstly, collection well, equalization tank, oil & grease trap were used as pretreatment.
分别利用集水井、调节池、反应除油池作预处理；
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