“铁络合-生物法”组合工艺降解有机、无机氰

“Ferric complexation-biological method” combined process for degradation of organic and inorganic cyanide

苯二腈废水具有难氧化降解、高生物毒性等特点。特别是废水含有的有机、无机氰化物对生化系统中微生物存在高致毒性,无法采用常规的生物法直接处理。依据废水特点,本废水实验通过微电解、酸析、三氯化铁络合三种预处理工艺与直接厌氧处理进行降解效果对比。实验对比结果表明,采用三氯化铁络合工艺对该废水处理效果最佳。后续进入厌氧、反硝化以及硝化处理后出水指标可达到《污水综合排放标准》(GB8978-1996)三级标准要求。

The isophthalonitrile wastewater has the characteristics of refractory and high biological toxicity.Especially,inorganic and organic cyanide contained in wastewater is highly toxic to microorganisms in biochemical systems and cannot be directly treated by conventional biological methods.According to the characteristics of wastewater,the pretreatment experiment was compared by four processes: micro-electrolysis,acid precipitation,ferric chloride complexation and direct oxidation.The experimental comparison results show that the optimal treatment method is the ferric chloride complexing process.After the subsequent anaerobic process,denitrification and nitrification treatment,the effluent index can meet the requirements of the third-level standard of Integrated Wastewater Discharge Standard (GB8978-1996).