含油污泥固化处理后浸出实验研究

Experimental Study on Leaching of Oily Sludge after Solidification Treatment

含油污泥属于HW08类危险废物,不能直接排放或利用。固化法是一种较为理想的无害化处理技术,能使主要污染物指标达标,且固化处理效率高,能减少含油污泥对环境的影响。该文主要研究含油污泥经过固化处理后的浸出液,对含油污泥固化块进行浸出液毒性监测。研究结果表明:在水泥、粉煤灰、水三个因素中,水泥掺量对浸出液含油量和COD的影响最大。在含油污泥∶粉煤灰∶水泥∶水的配比为1∶0.504∶0.5∶0.167时浸出液含油量最低,含油污泥∶粉煤灰∶水泥∶水的配比为1∶0.504∶0.5∶0.2时浸出液COD最低。此时含油污泥固化后的浸出液的含油量和COD均符合国家污水综合排放标准,浸出液中的重金属含量也远远低于《危险废物鉴别标准一浸出毒性鉴别》(GB 5085.3—2007)的国家标准。

Oil containing sludge belongs to HW08 hazardous waste and cannot be directly discharged or utilized.Solidification process is an ideal harmless treatment technology,which can make the main pollutants up to the standard,and the solidification process has high efficiency,and can reduce the impact of oily sludge on the environment.This experiment mainly studies the leaching solution of the solidified oil-bearing sludge,and monitors the toxicity of the leaching solution of the solidified oil-bearing sludge.The results show that among the three factors of cement,fly ash and water,the amount of cement has the greatest influence on the oil content and COD of the leaching solution.When the ratio of oily sludge∶fly ash∶Cement∶water is 1∶0.504∶0.5∶0.167,the oil content of leachate is the lowest,oily sludge:fly ash∶Cement∶water ratio of 1∶0.504∶0.5∶0.2 when the lowest COD leaching solution.At this time,the oil content and COD of the solidified oil-bearing sludge leachate are in line with the national comprehensive wastewater discharge standards,the content of heavy metals in the leaching solution is far lower than the national standard of“Hazardous waste identification-leaching toxicity identification”(GB 5085.3—2007).