Study on treatment of sulfate radical in acid wastewater from coal mine by EACD technology
Acidic wastewater from coal mine was treated by optimized grounding electrode atomization corona discharge(EACD)technology with·OH scavenger.The effects of discharge voltage,discharge time and concentration ratio of sulfate to phenol on the degradation rate of sulfate were studied by using the response surface method.The result showed that the order of significance of each factor was as fol-lows:concentration ratio of sulfate to phenol＞discharge voltage＞discharge time,and the interaction of discharge voltage and concentration ratio of sulfate to phenol had a significant effect on the removal rate of sulfate.The optimized conditions were:the discharge voltage of 12 kV,the discharge time of 66 min,the concentration ratio of sulfate to phenol of 0.9,corresponding the sulfate removal rate was 76.55％and the error compared with the predicted value was only 0.55％.The experimental results are highly consistent with the model values,which confirms the accuracy of the regression model.
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