Influence of pH on heavy metal speciation and removal from wastewater using micellar-enhanced ultrafiltration
Influence of pH on heavy metal speciation and removal from wastewater using micellar-enhanced ultrafiltration
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pH 对胶束增强超滤废水中重金属形态和去除的影响
DOI：
10.1016/j.chemosphere.2016.12.137
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发表时间：
2017-04-01
期刊：
影响因子：
8.8
通讯作者：
Shi, Yahui
中科院分区：
文献类型：
--
作者：
Huang, Jinhui;Yuan, Fang;Shi, Yahui
在胶束强化超滤(MEUF)中，pH对重金属的去除起着重要作用。采用阴离子表面活性剂十二烷基硫酸钠和亲水膜聚醚砜，研究了pH对MEUF去除废水中重金属形态和去除效果的影响。实验在pH值为1-12的范围内进行。金属离子去除效率(R)用于评估MEUF工艺的效果。结果表明，在较高pH值(pH和gt；3)、SDS投加量为8 mM的条件下，铜、镉的去除效果较好，而锌、铅的最佳pH范围为3~10。在pH为1~12的条件下，随着金属离子进料浓度的增加，相应的重金属去除效率降低。此外，对重金属离子的去除能力(50 mg/L)依次为Pb2+和GT、Cd2+和Gt、Zn2+和Gt、Cu2+。结果表明，pH值是影响膜生物反应器中金属离子形态和去除的关键参数。(C)2016爱思唯尔有限公司。保留所有权利。
pH plays an important role in heavy metal removal during micellar-enhanced ultrafiltration (MEUF). In the present work, the influence of pH on heavy metal speciation and removal from wastewater by MEUF was investigated using an anionic surfactant (sodium dodecyl sulfate, SDS) and a hydrophilic membrane (polyether sulfone). Experiments were performed with pH values in the range of 1-12. Metal ion removal efficiency (R) was used to assess the effects of the MEUF process. Results showed that better removal rate of copper and cadmium was achieved at high pH values (pH > 3) with SDS feed concentration of 8 mM, while the optimal pH range was 3-10 for zinc and lead. The corresponding efficiencies for heavy metal removal decreased with the increasing feed concentration of metal ions under the pH conditions of 1-12. Furthermore, the heavy metal ion removal rate (50 mg/L) followed the order of Pb2+ > Cd2+ > Zn2+ > Cu2+. These results showed that pH is a key parameter in metal ion speciation and removal during MEUF. (C) 2016 Elsevier Ltd. All rights reserved.