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):70-75.
聚电解质强化超滤处理低浓度含Cd2+废水效能
- Title:
- Treatment Performance of Ultrafiltration on Low Concentration Wastewater Containing Cd2+ Enhanced by Polyelectrolyte
- Keywords:
- polyelectrolyte; ultrafiltration; Cd2+; polyacrylic acid (PAA); chitosan (CTS); membrane fouling
- 摘要:
- 分别采用聚丙烯酸(PAA)和壳聚糖(CTS)作为聚电解质，研究了聚电解质强化超滤法处理含Cd2+重金属废水，并考察了聚电解质浓度、pH值、共存离子对截留率、渗透性能和膜污染的影响。结果表明，对于20 mg/L的含Cd2+废水，当PAA、CTS浓度为100 mg/L时去除效果最好，对Cd2+的去除率分别为90.1%和91.6%，对PAA和CTS的去除率分别为71.5%和69.4%。pH值对Cd2+的去除影响较大，Cd2+去除率随着pH值的上升而明显增加，PAA和CTS的去除率则无明显变化。在PAA溶液中，4种共存离子对Cd2+的去除影响程度排序为Na+＞Cu2+＞Mg2+＞Ca2+；在CTS溶液中，对Cd2+的去除影响程度排序则为Cu2+＞Na+≈Mg2+＞Ca2+。聚电解质浓度越高，产生的膜污染越严重，而且投加CTS的膜污染更严重。
- 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.
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