养殖排污水循环处理系统由轮虫净化池、 沉淀净化池、 反冲式物理过滤装置和生物净化池组成。

Recycle system of shrimp culture wastewater was consisted of rotifer pond, deposit pond, bounce-back physical filtrate instrument and biological filtrate pond.

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城市污泥是城市污水处理厂经各级处理净化污水而产生的沉积物，主要来自初沉池和剩余污泥的排放。

Sewage sludge which mainly comes from the primary settling tank and discharge of surplus sludge is the deposit produced in each operating unit in municipal wastewater treatment plant.

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