CAJ | 학술논문

通过实验研究了还原沉淀-晶种曝气组合工艺去除电解锰废水中Cr6+和Mn2+，并探索了最佳工艺条件.首先以Na2SO3做还原剂将Cr6+转化为Cr3+后再通过化学沉淀法除去，然后采用加入MnO2做晶种曝气氧化去除废水中的Mn2+.结果表明：当Na2SO3投加量为0.5 g/L，还原反应pH值为4，还原反应时间6 min，Cr6+可完全转化为Cr3+.Cr3+在pH值为8时沉淀最完全，出水总铬浓度可从100 mg/L降到0.5 mg/L以下.除铬后，当MnO2投加量为25 g/L，废水pH值为9，曝气10 min，出水Mn2+浓度可从1000 mg/L 降到0.4 mg/L 以下.通过以上处理出水总铬和总锰均达到我国《污水综合排放标准（GB8978-1996）》一级要求.
통과실험연구료환원침정-정충폭기조합공예거제전해맹폐수중Cr6+화Mn2+，병탐색료최가공예조건.수선이Na2SO3주환원제장Cr6+전화위Cr3+후재통과화학침정법제거，연후채용가입MnO2주정충폭기양화거제폐수중적Mn2+.결과표명：당Na2SO3투가량위0.5 g/L，환원반응pH치위4，환원반응시간6 min，Cr6+가완전전화위Cr3+.Cr3+재pH치위8시침정최완전，출수총락농도가종100 mg/L강도0.5 mg/L이하.제락후，당MnO2투가량위25 g/L，폐수pH치위9，폭기10 min，출수Mn2+농도가종1000 mg/L 강도0.4 mg/L 이하.통과이상처리출수총락화총맹균체도아국《오수종합배방표준（GB8978-1996）》일급요구.
A new technology of reduction precipitation combined with crystal seed aeration is proposed for completely removing Cr6+and Mn2+from electrolytic manganese wastewater by studying the optimum treatment conditions. In the first step, Cr6+ was removed by chemical precipitation by transforming into Cr3+ using Na2SO3 as reductant. Then Mn2+is removed by aeration using MnO2 as crystal seed. The results are as follows:Cr6+ can be transformed into Cr3+ completely with Na2SO3 dosage of 0.5 g/L, reduction pH value of 4, reduction time of 6 min. Precipitation of Cr3+ is the most complete when pH value is 8 and the effluent concentration of total chromium is less than 0.5 mg/L from 100 mg/L. After chromium removal, the effluent concentration of Mn2+ is less than 0.4 mg/L from 1 000 mg/L when MnO2 dosage is 25 g/L, wastewater pH value is 9 and aeration time is 10 min which meets the first grade national sewage effluent discharge standard (GB8978-1996).