城市污泥处理与绿化利用

城市污水处理厂剩余污泥富含植物养分，在城市绿化中具有较高的利用价值，但污泥中也含有较高的重金属，会对城市地下水产生二次污染。采用改性粉煤灰钝化污泥，通过种植佛甲草绿化实验，探讨了不同配比和用量的改性粉煤灰处理污泥对植物生长状态以及对渗滤水的环境影响，得出用20％的改性粉煤灰钝化污泥作为绿化植物的种植基质可使渗滤水中污染物除去80％以上。

Sludge Treatment and Application in Greening

Sludge is a very good fertilizer source and has higher value in use as nutrients for greening, whereas sludge also contains higher concentration of heavy metals, with which urban underground water would be suffered secondary pollution. A test of greening with sedium lineare and modified fly ash passivation sludge was carried out to study the impacts of different mixture ratio and dosage of modified fly ash on the plant＇s growth and leachate. It was shown that 20% mixture ratio of modified fly ash was the optimum for sludge treatment and 80% of heavy metals pollution can be removed.