LI Xue,HE Li,FENG Chong-ling,et al.Treatment Performance of Ultrafiltration on Low Concentration Wastewater Containing Cd2+ Enhanced by Polyelectrolyte[J].China Water & Wastewater,2021,37(11 11):70-75.
Treatment Performance of Ultrafiltration on Low Concentration Wastewater Containing Cd2+ Enhanced by Polyelectrolyte
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第37卷
Number:
11 11
Page:
70-75
Column:
Date of publication:
2021-06-01
- Keywords:
- polyelectrolyte; ultrafiltration; Cd2+; polyacrylic acid (PAA); chitosan (CTS); membrane fouling
- Abstract:
- Ultrafiltration was enhanced by polyelectrolyte for the treatment of heavy metal wastewater containing Cd2+ by using polyacrylic acid (PAA) and chitosan (CTS) as polyelectrolytes,and effects of polyelectrolyte concentration, pH value and coexisting ions on rejection rate,permeability and membrane fouling were explored. For the treatment of wastewater with Cd2+ concentration of 20 mg/L, the best removal performance was obtained when PAA and CTS concentrations were both 100 mg/L, removal efficiencies of Cd2+ were 90.1% and 91.6%, respectively, and removal efficiencies of PAA and CTS were 71.5% and 69.4%, respectively. pH value had an obvious effect on Cd2+ removal,and the removal efficiency of Cd2+ increased sharply with the increase of pH value. However, no obvious change of PAA and CTS removal efficiencies was observed. In PAA solution,the influence of four coexisting ions on the removal of Cd2+ in descending order was Na+＞Cu2+＞Mg2+＞Ca2+, while the order was Cu2+＞Na+≈Mg2+＞Ca2+ in CTS solution. Higher polyelectrolyte concentration would lead to more serious membrane fouling, and the membrane fouling was more serious when CTS was added.
Last Update:
2021-06-01