Decolorization of dyes and textile wastewater by potassium permanganate.
Decolorization of 10 types of dye solutions by potassium permanganate was studied. Effects of reaction conditions on the decolorization efficiency were examined in batch experiments. The pH value had a significant effect on the decolorization efficiency. When pH value <1.5, the decolorization efficiency was very high. When pH value >4.0, the dye solutions were almost not decolorized. Concentration of potassium permanganate and temperature also showed significant effects on the decolorization efficiency. The decolorization rate of dye solutions by potassium permanganate was rapid, and most of dye solutions can be decolorized effectively. The results of total organic carbon indicated that dye solutions were degraded incompletely by potassium permanganate. The results of treatment of textile wastewater by potassium permanganate indicated that the oxidation with potassium permanganate might be used as a pre-treatment process before biological treatment.
Xu
Xiang-Rong
XR
Department of Ecology & Biodiversity, The University of Hong Kong, Pokfulam Road, Hong Kong, SAR, P.R. China. xuxr@hkusua.hku.hk
Li
Hua-Bin
HB
Wang
Wen-Hua
WH
Gu
Ji-Dong
JD
D003116:Color; D004396:Coloring Agents / Q000737:chemistry / Q000302:isolation & purification*; D006358:Hot Temperature; D006863:Hydrogen-Ion Concentration; D007220:Industrial Waste; D011196:Potassium Permanganate / Q000737:chemistry*; D013783:Textile Industry; D013997:Time Factors; D014865:Waste Disposal, Fluid; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*; D018508:Water Purification / Q000379:methods*
D004396:Coloring Agents; D007220:Industrial Waste; D014874:Water Pollutants, Chemical; D011196:Potassium Permanganate