Liu Rui-ping, Li Xing, Xia Sheng-Ji, Wu Rong-Cheng, Li Gui-Bai
School of Municipal & Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China.
Huan Jing Ke Xue. 2005 Jan;26(1):72-5.
The effectiveness and mechanism of permanganate enhancing arsenite (As(III)) co-precipitation with ferric chloride is investigated. Effects of parameters such as pH, natural organic matter (NOM) on As removal are studied. Permanganate significantly enhances As(III) removal for ferric co-precipitation (FCP) process. With Fe(III) dosage increasing from 2mg/L to 8mg/L, As removal increased from 41.3% to 75.4% for FCP process; for permanganate oxidation-ferric co-precipitation (POFCP) process, however, corresponsive As removal increased from 61.2% to 99.3% . As removal increased with higher pH for both processes; comparing to FCP process, pH had less effects on As removal for POFCP process; the presence of NOM reduced As removal for FCP process whereas no obvious reduction was observed for POFCP process. Permanganate oxidizing As(III) to As(V) is the main course for enhancing As(III ) removal; furthermore, products of permanganate reduction, hydrous MnO2 (s), also contribute to removing As. POFCP process exhibits good potential of removing As(III ) to assure chemical safety of drinking water.
研究了高锰酸盐强化亚砷酸盐（As(III)）与氯化铁共沉淀的效果及机制。研究了pH值、天然有机物（NOM）等参数对砷去除的影响。高锰酸盐显著提高了铁共沉淀（FCP）工艺对As(III)的去除率。随着铁（III）投加量从2mg/L增加到8mg/L，FCP工艺对砷的去除率从41.3%提高到75.4%；而对于高锰酸盐氧化-铁共沉淀（POFCP）工艺，相应的砷去除率从61.2%提高到99.3%。两种工艺中砷的去除率均随pH值升高而增加；与FCP工艺相比，pH值对POFCP工艺中砷去除的影响较小；NOM的存在降低了FCP工艺中砷的去除率，而POFCP工艺中未观察到明显降低。高锰酸盐将As(III)氧化为As(V)是提高As(III)去除率的主要过程；此外，高锰酸盐还原产物水合MnO₂(s)也有助于去除砷。POFCP工艺在去除As(III)方面具有良好潜力，可确保饮用水的化学安全性。
