高铁酸钾处理多晶硅废水影响因素研究

Research on the influential factors of the polycrystalline silicon wastewater treatment by potassium ferrate

采用高铁酸钾处理多晶硅废水,考察了初始p H、高铁酸钾投加量和反应时间对污染物去除效果的影响。结果表明,高铁酸钾通过氧化和絮凝作用去除污染物。初始p H为4时,高铁酸盐对COD和浊度的去除率最高,初始p H在5以下时高铁酸盐除F-效果好;初始p H为4、最佳投加量为500 mg/L情况下,高铁酸盐对COD的去除率达到43.4%。纳滤分析表明高铁酸盐氧化能使聚乙二醇断链降聚,改善了多晶硅废水的可生化性。

Potassium ferrate has been used for treating polycrystalline silicon wastewater. The influences of initial pH, potassium ferrate dosage, and reaction time on the removing effect of pollutants are investigated. The results show that pollutants are removed by oxidation and flocculation of potassium ferrate. When initial pH is 4,the removing rates of COD and turbidity by potassium ferrate are the highest. When initial pH is below 5, F^-removing rate by potassium ferrate is good. And when initial pH is 4 and optimum potassium ferrate dosage is 500 mg/L, the removing rate of COD by potassium ferrate reaches 43.4%. The NF analysis shows that ferrate oxidation can cause chain fracture and polymerization descent of polyethylene glycol, and, as a result, the biodegradability of polycrystalline silicon wastewater has been improved.