"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。

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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。

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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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