根据污泥的分离过程分类，可将污泥分为沉淀污泥和生物处理污泥；沉淀污泥 （primary settling sludge）是包括初次沉淀池沉淀的污泥以及用化学药剂沉淀下来的污泥。
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保温水箱下方排污管设在保温水箱最低点，沉淀污泥较易排出。
Moreover, as the blow-off pipe below the heat preservation water tank is arranged at the lowest point thereof, deposited sludge can be discharged easily.
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。
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.
一个活性污泥系统包括一个均衡盆地，一个沉淀池，曝气盆地的，一个澄清和污泥回收线。
An activated sludge system consists of an equalization basin, a settling tank, an aeration basin, a clarifier, and a sludge recycle line.
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