"Sewage sludge" means sludge arising from urban effluent treatment plant and includes pretreatment waste, scourings and unstabilised sludge.
“下水道淤泥”，是指经城市污水处理厂产生的淤渣，包括预处理的废物、污垢和性质不稳定的淤泥。
Sludge density index (SDI) of effluent treated by improved formula is below 5.0, and it would meet the quality requirement of the influent of following reverse osmosis unit.
经改进配方，处理的排污水的污泥密度指数(SDI)小于5.0，能够满足后续反渗透单元的进水要求。
The treatment consists of mixing the effluent with biological sludge and then feeding oxygen to oxidize the polluting organic compounds to carbon dioxide.
即首先把污水和生物泥浆相混合，然后通入氧气，把有机污染物氧化为二氧化碳。
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