摘要
为实现液态烃碱渣和离子液体废催化剂的协同中和处置,采用化学沉淀—絮凝法工艺对液态烃碱渣进行预处理以去除硫化物与COD。系统考察了影响化学沉淀法的主要因素,选择硫酸铜为沉淀剂、在投加量为34 g/L、反应时间为20 min条件下,液态烃碱渣中硫化物去除率为96.88%,COD去除率为74.68%。进一步采用絮凝法处理反应体系,选择阳离子聚丙烯酰胺、在絮凝反应时间20 min、沉降时间90 min、投加量15 mg/L的条件下,液态烃碱渣中硫化物总去除率提升至97.13%,COD去除率达到81.67%。再将化学沉淀—絮凝法处理后的碱渣与离子液体水解液在20℃以体积比14∶100进行中和调控,反应后中和液中COD、硫化物、油类指标达到《污水综合排放标准》(GB 8978—1996)中污水三级排放标准,实现了液态烃碱渣与离子液体废催化剂的协同中和处置利用。
In order to realize coordinated neutralization and disposal of liquid hydrocarbon base residue and spent ionic liquid catalyst,a chemical precipitation-flocculation process was used to pretreat liquid hydrocarbon base residue to remove sulfide and COD.The main factors affecting chemical precipitation method were systematically investigated.The removal rate of sulfide in liquid hydrocarbon spent caustic is 96.88%and COD removal rate is 74.68%under the conditions of precipitant dosage of copper sulfate of 34 g/L and reaction time of 20 min.The reaction system was further treated by flocculation method,and cationic polyacrylamide was selected.Under the conditions of flocculation reaction time of 20 min,settling time of 90 min,and dosage of 15 mg/L,the total removal rate of sulfide in liquid hydrocarbon spent caustic rises to 97.13%,and COD removal rate is 81.67%.The spent caustic treatment by chemical precipitation-flocculation process were neutralized at 20℃with ionic liquid hydrolyzate by controlling volume ratio of 14∶100.After the reaction,the COD,sulfide,and oil indicators in neutralized liquid can meet the third-level sewage discharge standard of“Comprehensive Wastewater Discharge Standards”(GB 8978—1996),and realizes the coordinated neutralization treatment and utilization of liquid hydrocarbon spent caustic and ionic liquid waste catalyst.
作者
张学勉
刘涛
张一敏
蔡震雷
万骞
ZHANG Xue-mian;LIU Tao;ZHANG Yi-min;CAI Zhen-lei;WAN Qian(School of Resource and Environmental Engineering,Wuhan University of Science and Technology,Wuhan 430081,China;State Environmental Protection Key Laboratory of Mineral Metallurgical Resources Utilization and Pollution Control,Wuhan 430081,China;Collaborative Innovation Center for the Utilization of Strategic Vanadium Resources,Wuhan 430081,China;Hubei Provincial Engineering Technology Research Center of High Efficient Cleaning Utilization for Shale Vanadium Resource,Wuhan 430081,China)
出处
《有色金属（冶炼部分）》
CAS
北大核心
2022年第5期129-137,共9页
Nonferrous Metals（Extractive Metallurgy)
基金
国家重点研发计划项目(2018YFC1900605)
国家自然科学基金资助项目(52174259)。
关键词
液态烃碱渣
化学沉淀法
絮凝
硫化物
离子液体水解液
liquid hydrocarbon spent caustic
chemical precipitation
flocculation
sulfide
ionic liquid hydrolysate
