摘要
针对装载各种油类物质的化工集装罐清洗废水难生物降解,乳化程度高的特点,分别采用化学混凝破乳法、生物处理法及混凝处理与生物处理相结合的方法对其进行了处理。结果表明:在5种无机混凝剂中,处理效果最好的为聚合氯化铝,其最佳投加质量浓度为0.35 g/L,最适pH为6.8;微生物处理实验中,驯化得到一株可降解混合油的菌株,其最佳投加体积分数为12%,培养时间为36 h。研究证明,生物—混凝联合工艺优于混凝—生物联合工艺,该联合工艺可使COD去除率达到98.57%,油去除率达到95.18%,处理后水可作为清洗水回用,实现了节能减排。
The cleaning wastewater from tanks containing various kinds of oily materials is difficult to be biodegraded and high in emulsification grade. It has been treated by chemical coagulation deemulsification process, biological treatment process, and combined coagulation-biological treatment process, respectively. The results show that PAC is the most efficient coagulant compared to the other four inorganic coagulants ：Al2 （SO4）3, AlCl3, FeCl3 and PFS. When the optimum dosage of PAC is 0.35 g/L and the most suitable pH is 6.8 ,the best treatment effect can be obtained. The bacterial strain that can degrade mixed oils has been acclimated,based on biological treatment experiments. Its optimum initial dosage is 12%, and cultivating time 36 h. The results show that the united process of biological treatment-coagulation is better than the united process of coagulation-biological treatment. Using this process, the COD removing rate can reach 98.57% and oil removing rate can reach 95.18%. The treated water can be reused as cleaning water, achieving the goal of energy-saving and emission-reduction.
出处
《工业水处理》
CAS
CSCD
北大核心
2012年第7期64-67,共4页
Industrial Water Treatment
基金
科技型中小企业创新基金项目(10C26211200185)
关键词
含油清洗废水
混凝剂
生物处理
油类降解菌
oil-bearing cleaning wastewater
coagulant
biological treatment
oil-degradation bacteria
