Recovery of surfactant SDS and Cd2+ from permeate in MEUF using a continuous foam fractionator.
The purpose of this study was to investigate the use of foam fractionation to recover valuable surfactant (SDS) and metal ion (Cd2+) in the permeate of micellar-enhanced ultrafiltration (MEUF). The effects of operating factors, such as time, air flow rate, feed flow rate, liquid height, foam height, feed surfactant concentration, ethanol concentration and temperature on separation characteristics were studied in the continuous operation. When the concentrations of surfactant (SDS) and metal ion (Cd2+) in the feed solution were 500 mg/L and 10 mg/L, an enrichment ratio of 3.1 was achieved for SDS along with 52% removal fraction, as well as 99.35% Cd2+ was removed, after optimization of different process parameters. As the optimized results, the air and liquid flow rates were 100 L/h and 5 L/h, liquid and foam heights were 45 cm and 66 cm, respectively, sparger pore size was 10 microm. The Cd2+ concentration in the effluent was lower than 0.1mg/L which could meet the integrated wastewater discharge standard (the first grade of national discharge standards in China).
Qu
Yun-Huan
YH
College of Environmental Science and Engineering, Hunan University, 410082 Changsha, Hunan, PR China. qyhcongcong@yahoo.com.cn
Zeng
Guang-Ming
GM
Huang
Jin-Hui
JH
Xu
Ke
K
Fang
Yao-Yao
YY
Li
Xue
X
Liu
Hong-Liang
HL
D000392:Air Movements; D002104:Cadmium / Q000737:chemistry*; D003247:Conservation of Natural Resources / Q000379:methods; D000431:Ethanol / Q000737:chemistry; D012967:Sodium Dodecyl Sulfate / Q000737:chemistry*; D013501:Surface-Active Agents / Q000737:chemistry*; D013696:Temperature; D014462:Ultrafiltration; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D018508:Water Purification / Q000379:methods*
D013501:Surface-Active Agents; D014874:Water Pollutants, Chemical; D002104:Cadmium; D012967:Sodium Dodecyl Sulfate; D000431:Ethanol