Process optimization of demulsification and centrifugal dewatering of oily sludge in Xinjiang oilfield
AN Jing1,, ZHOU Longtao1,,, JIA Yue1, XU Yang2, MA Yangfei3, SUN Lei4 1.Engineering Technology Research Institute, Xinjiang Oilfield Company, Karamay 834000, China 2.Security and Environmental Protection Department, Xinjiang Oilfield Company, Karamay 834000, China 3.No.2 Production Plant of Xinjiang Oil field Branch Company, Karamay 834000, China 4.No.1 Production Plant of Xinjiang Oil field Branch Company, Karamay 834000, China
Abstract:According to some characteristics such as complex composition, being difficulty separating and treating of oily sludge, the compound conditioner being comprised of demulsifier, flocculant, and auxiliary agent was applied to handle the oily sludge based on the roles of efficient demulsification of demulsifier for oil and water, flocculant coagulation and sedimentation of flocculant, and strengthening dehydration of auxiliary agent. Response surface methodology (RSM) was used to investigate the effects of demulsification and dehydration at the different reaction conditions such as demulsifier mixture ratio, temperature and flocculant concentration. The results showed that the influence degrees of each factor on the demulsification and dehydration performances were ranking as temperature, demulsifier ratio, and flocculant mass concentration. The high-temperature reaction environment is conducive to reduce the viscosity of the system, which improve the fluidity of water droplets, promote the thermal movement of water droplets, and then assist the agglomeration of water droplets, which achieve the efficient separation of oil and water. The dehydration rate for oily sludge reached to 92.55% at the reaction conditions of the ratio of demulsifier NP-9∶SDBS 9∶1, the dosage of 4 g·L?1, the reaction temperature of 51 ℃, the concentration of flocculant 16 mg·L?1, and the dosage of quicklime 1%. The SEM results showed that the compound demulsifier could improve the dehydration capacity of the sludge via changing the accumulation mode of the sludge, increasing the looseness of the sludge, and expanding the holes of the sludge. The investigation results provide reference for the field application of oily sludge reduction treatment. Key words:oily sludge/ demulsifier/ response surface methodology optimization/ sludge dehydration.
图1不同破乳剂对含油污泥脱水率的影响 Figure1.Effect of different demulsifiers on oily sludge dewatering
图6破乳剂比例、絮凝剂质量浓度和温度对油泥脱水率的响应曲面图 Figure6.Response surface map of demulsifier ratio, flocculant mass concentration and temperature on oily sludge dehydration rate
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1.Engineering Technology Research Institute, Xinjiang Oilfield Company, Karamay 834000, China 2.Security and Environmental Protection Department, Xinjiang Oilfield Company, Karamay 834000, China 3.No.2 Production Plant of Xinjiang Oil field Branch Company, Karamay 834000, China 4.No.1 Production Plant of Xinjiang Oil field Branch Company, Karamay 834000, China Received Date: 2021-04-09 Accepted Date: 2021-06-17 Available Online: 2021-09-15 Keywords:oily sludge/ demulsifier/ response surface methodology optimization/ sludge dehydration Abstract:According to some characteristics such as complex composition, being difficulty separating and treating of oily sludge, the compound conditioner being comprised of demulsifier, flocculant, and auxiliary agent was applied to handle the oily sludge based on the roles of efficient demulsification of demulsifier for oil and water, flocculant coagulation and sedimentation of flocculant, and strengthening dehydration of auxiliary agent. Response surface methodology (RSM) was used to investigate the effects of demulsification and dehydration at the different reaction conditions such as demulsifier mixture ratio, temperature and flocculant concentration. The results showed that the influence degrees of each factor on the demulsification and dehydration performances were ranking as temperature, demulsifier ratio, and flocculant mass concentration. The high-temperature reaction environment is conducive to reduce the viscosity of the system, which improve the fluidity of water droplets, promote the thermal movement of water droplets, and then assist the agglomeration of water droplets, which achieve the efficient separation of oil and water. The dehydration rate for oily sludge reached to 92.55% at the reaction conditions of the ratio of demulsifier NP-9∶SDBS 9∶1, the dosage of 4 g·L?1, the reaction temperature of 51 ℃, the concentration of flocculant 16 mg·L?1, and the dosage of quicklime 1%. The SEM results showed that the compound demulsifier could improve the dehydration capacity of the sludge via changing the accumulation mode of the sludge, increasing the looseness of the sludge, and expanding the holes of the sludge. The investigation results provide reference for the field application of oily sludge reduction treatment.
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