生物热洗+微生物降解技术处理含油污泥的室内实验研究

为解决一直困扰油田的含油污泥处理难题,进行了“生物热洗+微生物降解”工艺处理含油污泥的创新性实验。对非离子型生物表面活性剂S1、阴离子表面活性剂R2和无机清洗助剂N2,通过正交实验确定了最优药剂配比(质量比)为S1∶R2∶N2=0.08∶0.03∶0.15;对生物热洗的工艺条件进行探索,确定最佳工艺条件清洗温度为60℃,液固比为5,清洗时间为50 min。对经过生物热洗后残留的石油,进行了3种条件下的微生物堆肥降解实验。实验结果表明:3^#实验(含油污泥+锯末+营养物质+菌剂+复合生物表面活性剂A1)降解率达到85.5%,相比1^#实验(含油污泥+锯末+营养物质)和2^#实验(含油污泥+锯末+营养物质+菌剂)降解率分别提高了71.0%和23.7%。最终经过“生物热洗+微生物降解”工艺处理后的含油污泥含油率降至0.8%,并且可以较好地回收油泥中的石油。本实验研究为下一步的现场应用提供了依据。

Laboratory Experimental Study of Oily Sludge Treatment by Biological Heat Washing and Microbial Degradation Technology

In order to solve the difficult problem of oily sludge treatment,an innovative experiment of"biological heat washing+microbial degradation"is carried out.For non-ionic biological surfactant S1,anionic surfactant R2 and inorganic cleaning assistant N2,the optimal reagent ratio(mass ratio)is determined as S1:R2:N2=0.08:0.03:0.15 through orthogonal experiment.The technological conditions of biological heat washing are explored,and the optimal technological conditions are determined to be a cleaning temperature of 60℃,a liquid-solid ratio of 5,and a cleaning time of 50 min.Three microbial composting degradation experiments are carried out on the residual oil after biological heat washing.The results shows that the degradation rate of experiment 3^#(oily sludge+sawdust+nutrients+bacteria+compound biological surfactant A1)reaches 85.5%,which is 71.0%and 23.7%higher than that of experiment 1^#(oily sludge+sawdust+nutrients)and experiment 2^#(oily sludge+sawdust+nutrients+bacteria),respectively.Finally,the oil content of oily sludge treated by"biological heat washing+microbial degradation"technology is reduced to 0.8%,and the oil in the sludge could be recovered well.The experimental study provides a basis for further field application.