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采用硫酸亚铁曝气沉降初级化学处理和 CIO_2二级深度氧化处理相结合的模式。处理医院排放的高浓度含氰废水。试验表明,初级化学处理中.FeSO_4·7H_2O 的加入量为1.2g/L,搅拌强度为80r/min,搅拌时间为30—40min,曝气时间为20min;二级化学处理中。CIO_2加入量为0.045g/L,pH 值为10～11。氧化时间为15min,采用滤后投加 CIO_2,出水 CN~-含量小于0.5mg/L,CN~-去除率97%以上,达到国家一级排放标准 GB8978-1996。
The combination of primary chemical treatment of ferrous sulfate aeration and secondary deep oxidation of CIO_2 was adopted. Treatment of high concentrations of cyanide effluent discharged from hospitals. The results showed that the addition of FeSO 4 · 7H 2 O was 1.2g / L, the stirring intensity was 80r / min, the stirring time was 30-40min and the aeration time was 20min in the primary chemical treatment. The amount of CIO_2 was 0.045g / L and the pH value was 10 ~ 11. The oxidation time was 15min. After filtration, CIO_2 was added. The content of CN ~ - in the effluent was less than 0.5mg / L and the CN ~ - removal rate was above 97%. It reached the national emission standard GB8978-1996.