Wastewater treatment plants concentrate large quantities of phosphorus and ammonia in their sludge-handling streams.

一般在污水处理厂的污泥中会富集大量的磷和氨。

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Prolonging properly anaerobic treatment time and increasing aeration rate of nitrogen can improve anaerobic environment and the activity of sludge, increasing the removal rate of phosphorus.

适当延长厌氧处理时间和适当增大厌氧过程曝气速率可以改善厌氧环境及活性污泥性能，提高磷的去除率。

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From the meaning of phosphorus in ecosystem and the geological and biological circulation of phosphorus, the technical way of recovering phosphorus from civic wastewater and sludge is discussed.

从磷在生态系统中的意义和磷的地质、生物循环过程入手，论述了从污水及污泥中回收磷资源的技术方法。

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