For seasonal ammonia and organic micro-polluted raw water, biological sludge in sedimentation tank following bio-pretreatment was returned to flocculation tank, to enhance conventional process.

针对季节性氨氮和有机微污染水源，通过回流生物预处理后沉淀池生物污泥至絮凝池，进行常规生物强化处理。

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For seasonal ammonia and organic micro-polluted raw water, biological sludge in sedimentation tank following bio-pretreatment was returned to flocculation tank, to enhance conventional process.

针对季节性氨氮和有机微污染水源，通过回流生物预处理后沉淀池生物污泥至絮凝池，进行常规生物强化处理。

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