曝气铁碳内电解-改性茶渣联用技术处理含氰电镀废水

TREATMENT OF ELECTROPLATING WASTEWATER CONTAINING CYANIDE BY AERATED Fe / C INTERNAL ELECTROLYSIS-MODIFIED TEA DREGS HYPHENATED TECHNIQUE

曝气铁碳内电解-改性茶渣联用技术处理含氰电镀废水,对内电解处理工序中Fe/C体积比、进水pH、不同曝气方式、停留时间及改性茶渣处理工序中进水pH、处理时间对废水中总氰化物去除率的影响进行分析。结果表明,最佳工艺条件为:内电解工序:V(Fe)/V(C)为1∶1、进水pH为4、采用连续曝气方式、停留时间为3 h;改性茶渣工序:进水pH为8、室温下投加1 g改性茶渣、处理时间为3 h,总氰化物去除率可达82.15%,最终出水中总氰化物浓度为28.97 mg/L。

Electroplating wastewater containing cyanide was treated by aerated Fe / C internal electrolysis-modified tea dregs hyphenated technique. The effects of volume ratio of Fe / C,influent pH,different aeration mode,residence time in internal electrolysis process as well as the effects of influent pH,residence time in modified tea dregs process on the removal rate of cyanide were discussed. The experiment results showed that the optimal parameters of treatment were as follows: internal electrolysis process: V( Fe) ∶ V( C) of 1∶ 1,influent pH of 4,continuous aeration mode,residence time of 3 h; modified tea dregs process: influent pH of 8,the dosage of dregs of 1 g at room temperature,residence time of 3 h. The concentration of cyanidein in effluent was 28. 97 mg / L,which means the final removal rate of cyanide was 82. 15%.