Adsorption of microcystin-LR by three types of activated carbon.
The effect of carbon properties and water characteristics on the adsorption of m-LR by activated carbon was evaluated using kinetic and isotherm tests. The results showed that both physical and chemical effects simultaneously affect the adsorption process. The activated carbon with a high ratio of mesopore and macropore volume showed an increased m-LR adsorption capacity. The micropores in carbon offer only a nominal internal surface for adsorption. The adsorption capabilities of different activated carbon generally followed their pH(zpc) values. Activated carbons with higher pH(zpc) values exhibit a neutral or positive charge under typical pH conditions, promoting m-LR adsorption on the carbon surface. The competitive effects of natural organic matter (NOM) on activated carbon were evaluated and showed that caused a reduction in the capacity of carbon for m-LR. Furthermore, when pre-chlorination was preceded by adsorption, then the residual chlorine would react with activated carbon caused a decrease in sorption capacity of m-LR, while that chlorine at normal treatment plant dosages is not effective for degrading m-LR.
Huang
Winn-Jung
WJ
Department of Environmental Engineering, Hung Kuang University, 34 Chung Chie Road, Sha-Lu, Taichung, Taiwan, ROC. huangwj@sunrise.hk.edu.tw
Cheng
Bai-Ling
BL
Cheng
Yung-Ling
YL
D000327:Adsorption; D002606:Charcoal / Q000737:chemistry*; D002713:Chlorine / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D008387:Marine Toxins; D052998:Microcystins / Q000737:chemistry*; D009930:Organic Chemicals / Q000737:chemistry; D014865:Waste Disposal, Fluid / Q000379:methods; D014873:Water Pollutants / Q000737:chemistry*
D008387:Marine Toxins; D052998:Microcystins; D009930:Organic Chemicals; D014873:Water Pollutants; D002606:Charcoal; D002713:Chlorine; C057862:cyanoginosin LR