作　　者： ; ; ; ; ; ;

机构地区： 中国科学院生态环境研究中心

出　　处： 《环境工程学报》 2014年第6期2347-2352,共6页

摘　　要： 针对山西某煤矿高矿化度、高铁酸性矿井水除铁效果差、出水容易返色等问题,采用NaOH中和调pH、曝气及化学氧化等处理工艺进行酸性矿井水中和沉淀法除铁优化实验研究。结果表明,采用NaOH中和沉淀法除铁时,投加中和剂使出水pH达6.7以上时,出水中铁含量低于10 mg/L,满足排放要求。对于本实验废水NaOH所需投加量为2.8 g/L,铁的去除率可达到99.75%;以H2O2对原水进行氧化处理,可迅速将Fe(Ⅱ)氧化成Fe(Ⅲ),其用量与原水中Fe(Ⅱ)的含量成正比。当其用量为1.6 mL/L时,可将原水中的Fe(Ⅱ)完全转化为Fe(Ⅲ),投加中和剂使出水pH达到4.5以上时,能使出水中铁含量满足排放要求。对于实验废水所需的NaOH投加量为2.0 g/L,比直接中和沉淀所需的NaOH用量要节省28.6%。曝气处理对原水中Fe(Ⅱ)的氧化效果不明显。 In view of the yellowing color issue of effluents in the neutralization process of acidic mine draining water with high salinity and immense iron content from a coal mine in Shanxi Province,the pH adjustment, aeration and chemical oxidation of H2O2followed by NaOH precipitation were investigated to optimize the iron removal by the neutralization process. It is concluded that as the effluent pH reached above 6. 7 after neutralization,the iron removal rate can reach up to 99% with the residue iron content less than 10 mg/L in the effluent, which will meet the discharge requirement. In our research,the required dosage of NaOH in neutralization was 2. 8 g/L. The addition of H2O2into raw water can oxidize Fe(Ⅱ) to Fe(Ⅲ) effectively and the dosage was proportional to Fe(Ⅱ) content in the wastewater. For the dosage of 1. 6 mL/L H2O2a complete conversion of Fe(Ⅱ) into Fe(Ⅲ) in the acidic mine draining water can be reached. When pH was adjusted by neutralization to above 4. 5 under the addition of 1. 0 mL/L of H2O2,the residue iron content will meet the discharge requirement. In this experiment,2. 0 g/L NaOH was used to reach the same iron removal,which will reduce 28. 6% of the dosage. It is also shown that the effect of aeration is not prominent for the oxidation of Fe(Ⅱ) to Fe(Ⅲ) in the acidic mine draining wastewater.

关 键 词： 酸性矿井水 中和法 除铁

领　　域： [环境科学与工程]