Removal of Cu2+ and turbidity from wastewater by mercaptoacetyl chitosan.
A macromolecule heavy metal flocculant mercaptoacetyl chitosan (MAC) was prepared by reacting chitosan with mercaptoacetic acid. In preliminary experiments, the flocculation performance of MAC was evaluated by using wastewater containing Cu(2+) or/and turbidity. Some factors which affect the removal of Cu(2+) and turbidity were also studied. The experimental results showed that: (1) MAC can remove both Cu(2+) and turbidity from wastewater. The removal efficiency of Cu(2+) by using MAC combined with hydrolyzed polyacrylamide is higher than that by only using MAC, the removal efficiency of Cu(2+) reaches above 98%; (2) when water sample containing not only Cu(2+) but also turbidity-causing substance, the removal efficiency of both Cu(2+) and turbidity will be promoted by the cooperation effect of each other, the residual concentration of Cu(2+) reaches below 0.5 mg L(-1) and the turbidity reaches below 3NTU, Cu(2+) is more easily removed by MAC when turbidity is higher; (3) the removal efficiency of Cu(2+) increases with the increase in pH value, contrarily removal efficiency of turbidity decreases with the increase in pH value.
Chang
Qing
Q
School of Environmental and Municipal Engineering, Lanzhou Jiaotong University, Lanzhou, Gansu 730 070, China. changq47@mail.lzjtu.cn
Zhang
Min
M
Wang
Jinxi
J
D048271:Chitosan / Q000737:chemistry; D003300:Copper / Q000302:isolation & purification*; D005427:Flocculation; D006863:Hydrogen-Ion Concentration; D007220:Industrial Waste / Q000517:prevention & control; D013438:Sulfhydryl Compounds / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*; D018508:Water Purification / Q000379:methods*
D007220:Industrial Waste; D013438:Sulfhydryl Compounds; D014874:Water Pollutants, Chemical; D003300:Copper; D048271:Chitosan