半导体行业含氟废水处理探讨
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摘要
目前,上海市执行的《半导体行业污染物排放标准》(DB31/445-2006)中氟化物排放限值为20mg/L,虽然即将实施的《电子工业污染物排放标准》二次征求意见稿中氟化物间接排放限值没有变化,但北京市现行的《水污染物综合排放标准》(DB11/307-2013)表3中规定,排入公共污水处理系统的氟化物限值仅为10mg/L。对于整个半导体行业来说,氟化物的排放限值要求有日益严格的趋势。出于对排放标准的前瞻性考虑,为应对日益严格的污染物排放要求,某半导体公司对既有的含氟废水混凝-沉淀处理工艺做出了一系列改进,包括改变CaCl_2投加量、改变水力停留时间、电絮凝、投加除氟剂等,形成半导体行业含氟废水处理最佳可行技术。这对指导上海乃至全国半导体行业含氟废水的达标排放具有重要意义。
The fluoride limit in The discharge standards of pollutants for semiconductor industry(DB31/445-2006), the present discharge standards of Shanghai is 20 mg/L,which is similar to the fluoride limit in Emission standard of pollutants for electrical industry that will be implemented in China. Nevertheless, the limit value of floride in Integrated discharge standard of water pollutants of Beijing is 10 mg/L. Therefore, the situation shows that the fluoride limit has an increasingly stringent trend.A semiconductor industry has made a series of attempts based on its floride treatment technology, including the change of CaCl_2 dosage, the change of hydraulic retention time(HRT), electrocoagulation, the use of defluorinating agents, etc. This study describes the research that the author has been done, and discusses the Best Available Technology(BAT) of fluoride-containing wastewater treatment for semiconductor industry.
The fluoride limit in The discharge standards of pollutants for semiconductor industry(DB31/445-2006), the present discharge standards of Shanghai is 20 mg/L,which is similar to the fluoride limit in Emission standard of pollutants for electrical industry that will be implemented in China. Nevertheless, the limit value of floride in Integrated discharge standard of water pollutants of Beijing is 10 mg/L. Therefore, the situation shows that the fluoride limit has an increasingly stringent trend.A semiconductor industry has made a series of attempts based on its floride treatment technology, including the change of CaCl_2 dosage, the change of hydraulic retention time(HRT), electrocoagulation, the use of defluorinating agents, etc. This study describes the research that the author has been done, and discusses the Best Available Technology(BAT) of fluoride-containing wastewater treatment for semiconductor industry.
引文
[1]汪轶杰.关于半导体行业含氟废水的处理策略探讨[J].资源节约与环保,2015(7).
[2]S.Aoudj,A.Khelifa,N.Drouiche,et al.Removal of fluoride and turbidity from semiconductor industry wastewater by combined coagulation and electroflotation[J].Desalination and Water Treatment,2015:1-8.
[3]郑文钗.钙盐沉淀-混凝沉淀法处理酸性含氟工业废水[J].科技创新,2014(13):24-25.
[2]S.Aoudj,A.Khelifa,N.Drouiche,et al.Removal of fluoride and turbidity from semiconductor industry wastewater by combined coagulation and electroflotation[J].Desalination and Water Treatment,2015:1-8.
[3]郑文钗.钙盐沉淀-混凝沉淀法处理酸性含氟工业废水[J].科技创新,2014(13):24-25.