KMnO_(4)强化混凝耦合超滤去除湖库水中共存铁锰藻

Potassium Permanganate Pre-oxidation Enhanced Coagulation Coupled with Ultrafiltration to Remove Co-existed Iron, Manganese and Algae in Lakes and Reservoirs in South China

华南地区湿热环境下铁、锰和藻共存湖泊水具有明显的地域特征。对华南地区三个典型的高藻湖水进行了水质调研,针对性地研究了高锰酸钾预氧化强化混凝耦合超滤对高藻湖泊水中铁、锰、藻的去除效能及膜污染特征。结果表明,随着高锰酸钾投加量的增加,耦合工艺对铁、锰、藻、蛋白质和多糖的去除效果均增强,尤其当投加量为2.5 mg/L时,铁、锰、藻的去除率分别可达93.7%、91.5%、91.0%。进一步研究发现,高锰酸钾预氧化水中铁和锰的产物对高藻水具有助凝作用,使得藻细胞团聚并且形成了更大的颗粒,SEM-EDS和XPS分析显示高锰酸钾预氧化形成了铁与锰的氧化物。最后,对实际湖库水进行短周期和长周期实验,出水水质均保持稳定,且预氧化能有效缓解膜污染。

The distribution of co-existed iron, manganese and algae in South China has obvious regional characteristics under the hot-humid environment. Based on the water quality investigation of three typical algae-laden lakes in South China, the removal of iron, manganese and algae and membrane fouling characteristics have been specifically explored in the potassium permanganate pre-oxidation enhanced coagulation coupled with ultrafiltration process. The results showed that the removal effects of iron, manganese, algae, protein and polysaccharide were enhanced with the potassium permanganate dosage rising in the coupled process. Especially the removal rates of iron, manganese and algae reached93.7%, 91.5% and 91.0%, respectively, with potassium permanganate dosage of 2.5 mg/L. In addition, the products of potassium permanganate pre-oxidation exhibited the coagulation-assisting effect on high algae-laden water and were identified as iron and manganese oxides based on SEM-EDS and XPS analysis. Finally, the stable effluent quality and alleviative membrane fouling also were confirmed by the short-term and long-term experiments on the actual lake and reservoir water.