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.