双亲型清水剂处理油田含聚污水

Treatment of polymer-containing oilfield wastewater using amphipathic water clarifier

考察了双亲型清水剂QS-03对油田含聚污水处理效果的影响因素,并对其作用机理进行了分析。实验结果表明：当清水剂QS-03的亲水性与亲油性功能基团的摩尔比为2∶1、清水剂加入量大于等于200 mg/L时,处理后污水澄清透明,污水含油量由4 540 mg/L大幅降至26~45 mg/L;在处理温度为50~80℃和污水含油量为3 200~5 800 mg/L的范围内,清水剂QS-03均表现出良好的清水效果,生成的絮体呈松散状,具有良好的流动性。机理分析结果表明,双亲型清水剂QS-03可有效破坏油-水界面双电层、降低界面膜强度,并且与污水中阴离子聚合物的相互作用大幅减弱,因而在高效清水除油的同时可有效避免含聚污水处理中的黏性＂含聚油泥＂问题。

Novel amphipathic water clarifier QS-03 was developed for treatment of polymer-containing oilfield wastewater. The factors affecting the treatment were investigated, and the mechanism was analyzed. The experiment results show that： When the molar ratio of hydrophilic groups to hydrophobic groups of QS-03 is 2 ： 1 and the dosage of water clarifier is 200 mg/L and above, the treated wastewater is clear and even colorless with the oil content decreased dramatically from 4 540 mg/L to 26-45 mg/L; When the treatment temperature is 50-80 ℃ and the oil content is 3 200-5 800 mg/L, QS-03 also has good water-clarification effects, and the flocs are loose with good fluidity. The mechanism analysis results show that the thickness of the oil-water interface electric double layer and the strength of interfacial film can be decreased by amphipathic water clarifier QS-03, meanwhile the electrostatic neutralization interactions between the clarifier and the anionic polymer in wastewater become significantly weaker. It＇s indicated that the problem of viscous polymer-containing oily sludge in oil-removal treatment of polymer-containing oilfield wastewater can be successfully avoided by amphipathic water clarifier QS-03.