[Mechanism of natural organic matter removal by potassium permanganate composite enhanced coagulation].
Streaming current technique, fluctuation of transmitted light technique, molecular weight distribution and XAD resin adsorption technique were used to study the mechanism of natural organic matter removal by potassium permanganate composite (PPC) enhanced coagulation. Results showed that natural organic matter removal efficiency increased 13% by 0.75 mg/L potassium permanganate composite enhanced coagulation compared with that of alum coagulation alone. Streaming current indicated that potassium permanganate composite decreased the organic matter stability by reducing the surface negative charge, and the SC value increased from 55.2 to 61.4, 69.6 and 87.0 by addition of 0.50, 0.75 and 1.0 mg/L PPC. Coagulation index R indicated both nascent manganese dioxide and subsidiaries played an important role in potassium permanganate composite enhanced coagulation process. Potassium permanganate composite enhanced coagulation increased the removal efficiency of lower molecular weight and hydrophilic organic matter compared with alum coagulation, and hydrophilic organic matter can be reduced from 1.9 mg/L to 1.32 mg/L by the addition of 0.75 mg/L potassium permanganate composite.
State Key Laboratory of Pollution Control and Resources Reuse, Tongji University, Shanghai 200092, China. zhang_yongji@163.com
Yong-Ji
YJ
Zhang
Ling-Ling
LL
Zhou
Wei-Ying
WY
Li
Xing
X
Li
De-Qiang
DQ
Li
Gui-Bai
GB
Li
D011232:Chemical Precipitation / Q000187:drug effects*; D009930:Organic Chemicals / Q000737:chemistry* / Q000302:isolation & purification; D011196:Potassium Permanganate / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D018508:Water Purification / Q000379:methods*
D009930:Organic Chemicals; D014874:Water Pollutants, Chemical; D011196:Potassium Permanganate