This work deals with the treatment of oily wastewater produced from the washing of oil-contaminated soil. Untreated oily wastewater contains toxic compounds that might be mutagenic or carcinogenic as total petroleum hydrocarbon (TPH) and heavy metals. Based on the water quality analysis, the tested samples contained a high concentration of TPH, chemical oxygen demand (COD) and turbidity with an average value of 67,500 mg/l, 48,240 mg/l and 176 (nephelometric turbidity unit, NTU), respectively. Several technologies were used, such as centrifuging, powdered activated carbon (PAC) and sawdust. The mean values of COD values for sawdust, centrifuging and PAC were 41,067, 25,600 and 13,133 mg/l, respectively. The present study indicated that the coagulation/flocculation processes were more efficient by using aluminium sulphate alum, while the preliminary conclusion derived was that the secondary treatment using an aeration system is capable of lowering the COD values as well as increasing the flocculent mass floc well equal to 4,784 mg/l and 0.69 g, respectively. The microbial seed was able to degrade the biosurfactant, which allows the stability of oil emulsion to be broken down and released easily.

这项工作涉及对油污土壤洗涤产生的含油废水的处理。未经处理的含油废水含有有毒化合物，如总石油烃 (TPH) 和重金属，这些化合物可能具有致突变性或致癌性。根据水质分析，测试样品含有高浓度的 TPH、化学需氧量 (COD) 和浊度，平均值分别为 67,500 mg/l、48,240 mg/l 和 176（比浊浊度单位，NTU） . 使用了几种技术，例如离心、粉末活性炭 (PAC) 和锯末。木屑、离心和 PAC 的 COD 值的平均值分别为 41,067、25,600 和 13,133 mg/l。本研究表明，使用硫酸铝明矾的混凝/絮凝过程更有效，而初步得出的结论是，使用曝气系统的二级处理能够降低 COD 值并增加絮凝物质量，分别达到 4,784 毫克/升和 0.69 克。微生物种子能够降解生物表面活性剂，这使得油乳液的稳定性很容易被分解和释放。