[Effectiveness and mechanism of permanganate enhancing arsenite co-precipitation with ferric chloride].
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.
Liu
Rui-ping
RP
School of Municipal & Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China.
Li
Xing
X
Xia
Sheng-Ji
SJ
Wu
Rong-Cheng
RC
Li
Gui-Bai
GB
D018053:Arsenites / Q000032:analysis / Q000737:chemistry*; D011232:Chemical Precipitation; D002712:Chlorides; D005290:Ferric Compounds / Q000737:chemistry*; D005618:Fresh Water / Q000032:analysis; D011196:Potassium Permanganate / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000032:analysis / Q000737:chemistry; D018508:Water Purification / Q000379:methods*
D018053:Arsenites; D002712:Chlorides; D005290:Ferric Compounds; D014874:Water Pollutants, Chemical; D011196:Potassium Permanganate; C015001:arsenite; C024555:ferric chloride