微电解、Fenton氧化和生化组合工艺处理医药中间体废水

摘要

The wastewater of pharmaceutical intermediate factory exhibited the characteristic of high salinity, high concentration and high ammonia-nitrogen. Especially, this wastewater often contains nitrogenous heterocyclic compounds (NHCs), which are refractory and toxic pollution. Therefore, it is unlikely to remove them by conventional biological treatment. According to these facts, in this study a combined process of evaporation, micro-electrolysis, Fenton, facultative, aerobic, nitrification, nitrification and denitrification was employed to treat this wastewater. The results showed that the evaporation part can effectively remove the salt of wastewater. Further, the pretreatment of micro-electrolysis and Fenton can converse the NHCs into short-chain carboxylic acids which reduced the toxicity of the wastewater. The biochemical system can effectively remove COD and NH3-N. Therefore, after treatment the effluent quality can comply with Integrated Wastewater Discharge Standard.%南通某化工有限公司的医药中间体生产废水中呈高盐分、高浓度和高氨氮特点.特别是废水含有的含氮杂环类污染物对生化系统有毒性,无法采用常规的生物法进行处理.依据废水特点,废水处理工程采用蒸发-铁碳微电解-Fenton氧化-兼氧-接触氧化-硝化-反硝化-絮凝沉淀组合工艺.工程运行结果表明:蒸发单元可有效地去除废水中的盐分;铁/碳微电解和Fenton氧化的预处理工艺可以将废水中含有的含氮杂环类污染物转化为小分子酸,降低了废水的毒性;而生化系统可以有效地去除COD和NH3-N.经过处理后,出水指标均达到GB 8978—1996《污水综合排放标准》三级标准要求.