In this paper, electroplating wastewater containing chromium 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, influent temperature, residence time in modified tea dregs process on the removal rate of Cr6 +were discussed. The experiment results show that the optimal parameters of treatment are as follows:internal electrolysis process: Fe ( V) ∶ C ( V) is 1∶ 1, influent pH is 1, continuous aeration mode, residence time is 120 min; modified tea dregs process: influent pH is 7. 5, at room temperature, 0. 4 g dregs, residence time is 120 min. The concentration of Cr6 +in final effluent is 0. 409 mg/L, which is lower than the maximum allowable emission concentration in GB8978—1996.
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万方数据
维普
