Arsenic removal by MF membrane with chemical sludge adsorption and NF membrane equipped with vibratory shear enhanced process

被引:3
作者
Yi, SH [1 ]
Ahmed, S [1 ]
Watanabe, Y [1 ]
Watari, K [1 ]
机构
[1] Hokkaido Univ, Dept Urban & Environm Engn, Kita Ku, Sapporo, Hokkaido 0608628, Japan
来源
MEMBRANES IN DRINKING AND INDUSTRIAL WATER PRODUCTION III | 2003年
关键词
arsenic removal; chemical sludge; microfiltration membrane; nanofiltration membrane; vibratory shear enhanced process;
D O I
10.2166/ws.2003.0182
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Conventional arsenic removal processes have difficulty removing low concentrations of arsenic ion from water. Therefore, it is very hard to comply with stringent low levels of arsenic, such as below 10 mug/L. So, we have developed two arsenic removal processes which are able to comply with more stringent arsenic regulations. They are the MF membrane process combined with chemical sludge adsorption and NF membrane process equipped with the vibratory shear enhanced process (VSEP). In this paper, we examine the performance of these new processes for the removal of arsenic ion of a low concentration from water. We found that chemical sludge produced in the conventional rapid sand filtration plants can effectively remove As (V) ions of H2AsO4- and HAsO42- through anion exchange reaction. The removal efficiency of MF membrane process combined with chemical sludge adsorption increased to about 36%, compared to MF membrane alone. The strong shear force on the NF membrane surface produced by vibration on the VSEP causes the concentration polarization layer to thin through increased back transport velocity of particles. So, it can remove even dissolved constituents effectively. Therefore, As (V) ions such as H2AsO4- and HAsO42- can be removed. The concentration of As (V) ions decreased from 50 mug/L to below 10 mug/L and condensation factor in recirculating water increased up to 7 times by using NF membrane equipped with VSEP.
引用
收藏
页码:303 / 310
页数:8
相关论文
共 13 条
  • [1] Removal of humic substances by UF and NF membrane systems
    Bian, R
    Watanabe, Y
    Tambo, N
    Ozawa, G
    [J]. WATER SCIENCE AND TECHNOLOGY, 1999, 40 (09) : 121 - 129
  • [2] Alternative methods for membrane filtration of arsenic from drinking water
    Brandhuber, P
    Amy, G
    [J]. DESALINATION, 1998, 117 (1-3) : 1 - 10
  • [3] EDWARDS M, 1994, J AM WATER WORKS ASS, P64
  • [4] Arsenic removal during conventional aluminium-based drinking-water treatment
    Gregor, J
    [J]. WATER RESEARCH, 2001, 35 (07) : 1659 - 1664
  • [5] HERING JG, 1996, 90706 AWWARF
  • [6] IWAMOTO M, 2002, CREST S 2002
  • [7] IWAMOTO M, 1999, JAP GERM FRANC JOINT
  • [8] KAZUO T, 2001, RESOURCES ENV MEASUR, V37, P26
  • [9] REID J, 1994, J AM WATER WORKS ASS, V86, P44
  • [10] Effect of pH on rejection of different species of arsenic by nanofiltration
    Urase, T
    Oh, J
    Yamamoto, K
    [J]. DESALINATION, 1998, 117 (1-3) : 11 - 18