[Recovery and reuse of SDS by ultrafiltration with acid or chelator].
The retentate stream containing Cd2+ was chosen for the investigation. Effects of acid reagent, chelator, pH and operation mode on separation of Cd2+ and recovery of SDS, as well as efficiency of reclaimed SDS were investigated. The optimum conditions in acidification were obtained: H2SO4 as acid reagent, pH = 1.0, operation mode of batch. Under these conditions, separation of Cd2+ and recovery of SDS are 98.0% and 58.1%, respectively. And the efficiency of reclaimed SDS for removing Cd2+ is 80.2%. In chelation, the optimum conditions were investigated: EDTA as chelator, uncontrolled pH (pH = 4.4) and operation mode of batch. Under these conditions, separation of Cd2+ and recovery of SDS are 90.1% and 60.5%, respectively. And the efficiency of reclaimed SDS for removing Cd2+ is 79.4%.
Li
Xue
X
College of Environmental Science and Engineering, Hunan University, Changsha 410082, China. gina0131@163.com
Zeng
Guang-Ming
GM
Huang
Jin-Hui
JH
Xu
Ke
K
Fang
Yao-Yao
YY
Qu
Yun-Huan
YH
D002104:Cadmium / Q000737:chemistry*; D002614:Chelating Agents / Q000737:chemistry; D012967:Sodium Dodecyl Sulfate / Q000737:chemistry*; D013464:Sulfuric Acids / Q000737:chemistry; D013501:Surface-Active Agents / Q000737:chemistry*; D014462:Ultrafiltration / Q000379:methods; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D018508:Water Purification / Q000379:methods*
D002614:Chelating Agents; D013464:Sulfuric Acids; D013501:Surface-Active Agents; D014874:Water Pollutants, Chemical; D002104:Cadmium; D012967:Sodium Dodecyl Sulfate