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.
小功率超声波能够改善污泥的膨胀特性、提高污泥沉淀特性和脱水能力、降低污泥的含水率，达到减量的目的。
Low power ultrasound can modify sludge bulking characteristics, improve sludge settling and dewatering properties, so decrease sludge water content and sludge volume.
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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