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粉煤灰改性及鈍化污泥實驗研究

發布時間: 2012-09-15 11:27 查看: 1904次

粉煤灰石灰石鈍化輻照改性吸附
摘要：

以粉煤灰和石灰石為原料,加入一定量礦化劑,在微波輻照下進行改性,得到吸附材料粉煤灰沸石(FZ),通過X射線衍射和電鏡掃描等方式對粉煤灰輻照改性原理及產物結構等進行了分析,通過添加不同比例的粉煤灰對城市污泥進行了鈍化實驗研究,并對鈍化作用機理進行了分析,對鈍化污泥中重金屬含量變化及養分含量進行了測試,實驗結果表明,改性粉煤灰對污泥中含重金屬Zn、Cu、Mn具有明顯鈍化作用,對污泥中養分具有良好的滯留效果,經鈍化處理后,污泥中重金屬Zn、Cu、Mn含量都顯著低于國家農用標準,污泥滲濾液中全氮含量低于中國地面水環境質量標準(10 mg?L~(-1)),全磷含量低于污水排入城市下水道水質標準(1 mg?L~(-1)).

Abstract：

Under the microwave irradiation, a highly effective adsorptive material-zeolitized fly ash (FZ) was made by adding a certain amount of mineralizer in the raw material of the limestone and fly ash. The structure of zeolite and the mechanism of modification were investigated by the analysis of XRD and SEM. The stabilization mechanism was analyzed and the variation of heavy metals and nutrient contents in sewage sludge were investigated through the sludge stabilization experiment by mixing zeolitized fly ash in the municipal sewage sludge. It was indicated that the zeolitized fly ash had obvious stabilization effect to heavy metals (Zn.Cu.Mn) and had apparent retention ability to the nutrients contents of N.P of the municipal sewage sludge. The heavy metals contents of Zn, Cu and Mn were all significant lower than those in the national control standards for pollutants in sludges from Agricultural. After the stabilization treatment of the municipal sewage sludge, the total content of N was lower than that in the national surface water environmental quality standards (10 mg/L) , the total content of P was lower than that in Quality Standard of the Sewage discharged into the city sewer system(1 mg/L).

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