In response to the issue of high petroleum content in sour sewage from the 1.6 MMTPY delayed coking unit in SINOPEC QINGDAO PETROCHEMICAL CO., LTD., the properties and treatment difficulties of the wastewater were analyzed. The sour sewage is rich in emulsified oil, gum, and asphaltenes suspended matter, which are difficult to remove through traditional cationic demulsifier and settling floating oil methods. Based on the needs of environmental protection and improving quality and efficiency, a graded and step-by-step treatment plan has been proposed. By revamping the blowdown tower, the carrying capacity of wax oil at the top of the tower has been significantly reduced. Subsequently, using a combination of hydrophilic and hydrophobic fibers for physically strengthening demulsification and internal circulation to enhance the extraction and separation of dissolved oil, efficient treatment of sour sewage has been achieved. The results show that the mass concentration of oil in the treated effluent from the total outlet unit decreased from 1,020 mg/L to 462 mg/L, the chemical oxygen demand decreased from 19.88 g/L to 11.68 g/L, and the mass concentration of suspended solids decreased from 635 mg/L to 151 mg/L. This process not only achieves green and low-carbon treatment of oily sour water but also recovers light oil components, with significant economic benefits. It reduces the frequency of maintenance and repair of sewage stripping equipment and is expected to recycle about 0.85 t/h of sewage oil, reducing the cost of hazardous waste treatment by about 300,000 yuan per month.

针对中国石化青岛石油化工有限责任公司1.6 Mt/a延迟焦化装置含硫污水中石油类含量高的问题，分析了污水性质及处理难点。主要原因：污水中富含乳化态油及胶质、沥青质悬浮物，难以通过传统阳离子破乳剂和沉降浮油方法去除。基于环境保护和提质增效的需求，提出了分级分步处理方案：通过对吹汽放空塔进行空塔改造，显著降低了塔顶蜡油的携带量；后续采用亲疏水组合纤维物理强化破乳及内循环强化溶解油萃取分离工艺，实现了含硫污水的高效处理。结果表明，处理后的总出装置污水中石油类质量浓度由1 020 mg/L降至462 mg/L，化学需氧量由19.88 g/L降至11.68 g/L，悬浮物质量浓度由635 mg/L降至151 mg/L。该工艺不仅实现了含油酸性水的绿色低碳处理，还可回收轻质油组分，经济效益显著，减少了污水汽提装置的检维修频次，预计可回收利用的污油量约0.85 t/h，减少危险废物处理费用约30万元/月。