二沉污泥(secondey sludge)从二次沉淀池（或沉淀区）排出的沉淀物。
沉降在二沉池中的污泥被污泥铲铲起由于重力流入污泥消化储存设施中。
Sludge which settles in the secondary clarifier is picked up by the sludge scoop and can flow by gravity to digestion and storage facilities.
工艺特点：污泥处理负荷高，出水指标高，不需要传统工艺中的二沉池等。
Crafts features: high sludge treatment burden, high outlet water standard, and no need of the Secondary sedimentation tank like the traditional crafts.
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。
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.
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