The dyeing wastewater which was oxidized by bio-aeration has been treated through the process of flocculation sediment, then filtrated with the slag.

经生物曝气氧化后的印染废水，采用聚合氯化铝或聚合硫酸铁作絮凝剂进行絮凝处理。

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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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In addition, sludge return from chemical bio-flocculation process can not only improve the removal effect, but also has some stabilization effect on the fluctuation of inflow quality.

在化学生物絮凝工艺中污泥回流不仅可以提高去除效果，而且对进水水质波动有一定的稳定作用。

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