Kriipsalu Mait, Marques Marcia, Nammari Diauddin R, Hogland William
Department of Technology, University of Kalmar, Norravägen 47, Kalmar 39182, Sweden.
J Hazard Mater. 2007 Sep 30;148(3):616-22. doi: 10.1016/j.jhazmat.2007.03.017. Epub 2007 Mar 12.
The objective was to investigate the aerobic biodegradation of oily sludge generated by a flotation-flocculation unit (FFU) of an oil refinery wastewater treatment plant. Four 1m(3) pilot bioreactors with controlled air-flow were filled with FFU sludge mixed with one of the following amendments: sand (M1); matured oil compost (M2); kitchen waste compost (M3) and shredded waste wood (M4). The variables monitored were: pH, total petroleum hydrocarbons (TPHs), polycyclic aromatic hydrocarbons (PAHs), total carbon (C(tot)), total nitrogen (N(tot)) and total phosphorus (P(tot)). The reduction of TPH based on mass balance in M1, M2, M3 and M4 after 373 days of treatment was 62, 51, 74 and 49%; the reduction of PAHs was 97%, +13% (increase), 92 and 88%, respectively. The following mechanisms alone or in combination might explain the results: (i) most organics added with amendments biodegrade faster than most petroleum hydrocarbons, resulting in a relative increase in concentration of these recalcitrant contaminants; (ii) some amendments result in increased amounts of TPH and PAHs to be degraded in the mixture; (iii) sorption-desorption mechanisms involving hydrophobic compounds in the organic matrix reduce bioavailability, biodegradability and eventually extractability; (iv) mixture heterogeneity affecting sampling. Total contaminant mass reduction seems to be a better parameter than concentration to assess degradation efficiency in mixtures with high content of biodegradable amendments.
目的是研究炼油厂废水处理厂浮选-絮凝单元（FFU）产生的含油污泥的好氧生物降解。四个1立方米的带空气流量控制的中试生物反应器装满了FFU污泥，并与以下一种改良剂混合：沙子（M1）；熟化油堆肥（M2）；厨余堆肥（M3）和碎木屑（M4）。监测的变量有：pH值、总石油烃（TPH）、多环芳烃（PAH）、总碳（C(tot)）、总氮（N(tot)）和总磷（P(tot)）。处理373天后，基于质量平衡，M1、M2、M3和M4中TPH的减少率分别为62%、51%、74%和49%；PAH的减少率分别为97%、+13%（增加）、92%和88%。以下单独或组合的机制可能解释这些结果：（i）与改良剂一起添加的大多数有机物比大多数石油烃降解得更快，导致这些难降解污染物的浓度相对增加；（ii）一些改良剂导致混合物中TPH和PAH的降解量增加；（iii）涉及有机基质中疏水性化合物的吸附-解吸机制降低了生物可利用性、生物降解性并最终降低了可提取性；（iv）混合物的非均质性影响采样。在评估含有高含量可生物降解改良剂的混合物中的降解效率时，总污染物质量减少似乎是比浓度更好的参数。
