[Competitive adsorption between bromine and bromate on activated carbon and impact on bromate formation].
Regularity of adsorption removal for bromine and bromate in water has been tested by three different activated carbon. It is demonstrated that in single adsorbent solution adsorption removal rates for bromine and bromate is 69% and 88%, respectively. As for double adsorbent solution, the removal rate of bromine decreased to 10% and of bromate is higher than 60%. The competitive adsorption between NOM and bormate is due to surface area and pore size distribution etc. The pore size distribution for AC-400 favors NOM adsorption process but hinders bromate adsorption. In low concentration solution(c(e) < 72 mg x L(-1)) NOM is absorbed with high rate, while in the solution with the concentration between 72 mg x L(-1) and 211 mg x L(-1), AC-150 is effective in removing NOM. Furthermore, ammonia concentration and pH level has impact on bromate removal rate in water. The optimal conditions for bromate removal are determined by ammonia concentration less than 200 microg/L and low pH in water.
An
Dong
D
Department of Environmental Sciences and Engineering, Fudan University, Shanghai 200433, China. andonghit@163.com
Song
Jia-xiu
JX
Le
Lin-sheng
LS
Wang
Wei-zhi
WZ
D000327:Adsorption; D001959:Bromates / Q000032:analysis / Q000737:chemistry*; D001966:Bromine / Q000737:chemistry*; D002606:Charcoal / Q000737:chemistry*; D018508:Water Purification / Q000379:methods*
D001959:Bromates; D002606:Charcoal; D001966:Bromine