添加剩余活性污泥无害化处理含油钻屑

采用剩余活性污泥对废弃含油钻屑进行无害化处理。考察了加入剩余活性污泥后混合物料中微生物浓度、碱解氮含量、有效磷含量、总石油烃(TPH)含量和组分的变化,并对降解后混合物料的生物毒性进行了评价。实验结果表明:加入剩余活性污泥后,总细菌浓度保持在较高水平;碱解氮含量逐渐减少后保持稳定,有效磷含量在一定范围内波动,整体略有增加;剩余活性污泥的加入量为20%～60%(w)时, TPH去除率均达到74%以上,远高于未添加剩余活性污泥的对照组(28.8%);剩余活性污泥的添加能有效促进微生物对含油钻屑中TPH的降解及氮元素的转化,添加50%(w)以上的剩余活性污泥能使处理后含油钻屑的生物毒性更低,更有利于含油钻屑的无害化处理。

Harmless treatment of oily drilling cuttings by adding residual activated sludge

The waste oily drilling cuttings were harmlessly treated by using the residual activated sludge. The microbial concentration,alkali-hydrolyzable nitrogen content,available phosphorus content,total petroleum hydrocarbons （TPH） content and changes in composition of the mixture were investigated after adding the residual activated sludge. The biotoxicity of the mixture after degradation was evaluated. The experimental results showed that：After adding the residual activated sludge,the total bacterial concentration was kept at a high level;The alkali-hydrolyzable nitrogen content was gradually reduced and then remains stable,and the available phosphorus content fluctuated within a certain range with the overall increasing slightly;When the amount of residual activated sludge was 20%-60%（w）,the removal rate of TPH was above 74%,which was much higher than that of the control group （28.8%） without adding residual activated sludge;The addition of residual activated sludge could effectively promote the degradation of TPH and the conversion of nitrogen in oily drilling cuttings by microorganism,adding 50% （w） or more of the residual activated sludge could make the treated oily drilling cuttings less biotoxic and was more conducive to the harmless treatment of oily drilling cuttings.