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1·Simultaneously, the excess activated sludge that drained from the sediment pool returned the hydrolysis- acidification pool could be degraded, so the treatment cost of sludge could be lower.

同时，把二沉池排出的污泥回流至水解酸化池进行污泥减容化，还可以降低污泥的处理成本。

2·The settled sludge is then returned to the ditch via a sludge return pumping system.

固定的污泥然后回到沟里经由污泥回归泵系统。

3·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。

4·After the reconstruction of SBR, carbon storage sludge can be effectively taken from and returned to the SBR to improve nitrogen removal efficiency.

SBR经改造后，能有效实现取、返储碳污泥，提高了脱氮效果。