城市污染底泥及其蜂窝煤产品的浸出毒性研究

Study on Leaching Toxicity of Contaminated Sediments and Sediment-made Honeycomb Briquette

为了充分利用污染底泥中蕴含的能量,提出了一种以煤粉混合不同比例的污染底泥制作蜂窝煤的资源化途径。经检测,当底泥的添加量为30%时,可以生产出各项指标均符合《民用蜂窝煤》(GB/T 13593—1992)标准的底泥制蜂窝煤,同时探讨了高温焚烧对底泥制蜂窝煤中重金属的固化效果,以及不同p H值的酸雨对底泥制蜂窝煤焚烧灰渣中重金属浸出效果的影响,发现5种重金属的残渣态均有显著提高,说明高温焚烧对重金属有很好的固化效果。此外,不同p H值对不同重金属的浸出效果影响均不同。在温州市酸雨的影响下,灰渣中重金属的浸出量均低于生活垃圾填埋场污染物控制标准,可作生活垃圾填埋。

In order to take full advantage of the calorific value of contaminated sediments,one resource utilization way was brought up to manufacture honeycomb briquette by mixing coal with different proportions of contaminated sediments.Results indicated that when sediment accounted for 30%,the honeycomb briquette product could meet the national standard GB/T 13593-1992.Heavy metal curing-effect in honeycomb briquette by incineration and heavy metal leaching effect by acid rain at different pH values were considered.Results showed that the residual of 5 heavy metals were significantly increased,accounting for good curing-effect.Heavy metal leaching effect varied with acid rain at different pH values.Under the acid rain condition in Wenzhou,the leaching of heavy metal in ash were lower than that of the control standards and the residue could be disposed as household garbage.