Effect of pH on rejection of different species of arsenic by nanofiltration

Urase, Taro; Jeong-hak, Oh，; Yamamoto, Kazuo

doi:10.1016/s0011-9164(98)00062-9

Cited by 119 publications

(52 citation statements)

References 5 publications

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“…Oh et al (2000) applied reverse osmosis and nanofiltration membrane processes for the treatment of arsenic applying a low pressure (0.2-0.7 MPa) bicycle pump indicating the potential for this application of nanofiltration membranes in rural areas. Kang et al (2000) observed the same trend as Urase et al (1998) in comparative separation of As(III) and As(V). They observed that removal of As(V) was much higher than As(III) over the pH range 3-10.…”

Section: Membrane-based Processes For Purification Of Arsenic-contamisupporting

confidence: 56%

“…They achieved comparable separation of As(V) and As(III) with no preferential rejection of As(V) over As(III) indicating governing role of size exclusion in their separation. In their study on the effect of pH on the rejection of arsenic, Urase et al (1998) found that electrically charged membranes generally had a higher rejection for charged solutes than for non-charged solutes. Arsenic(V) is removed more efficiently than As(III).…”

Section: Membrane-based Processes For Purification Of Arsenic-contamimentioning

confidence: 99%

See 1 more Smart Citation

Contamination of groundwater by arsenic: a review of occurrence, causes, impacts, remedies and membrane-based purification

Pal¹,

Sen²,

Manna³

et al. 2009

Journal of Integrative Environmental Sciences

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The contamination of groundwater by leached out arsenic has assumed an alarming proportion in several countries. Continued and prolonged ingestion even at a very low level can lead to serious arsenic-related diseases. Strong epidemiological evidence of arsenic carcinogenicity has forced the World Health Organization (WHO) to lower the maximum permissible contaminant limit (MCL) in drinking water to 10 ppb from earlier limit of 50 ppb. This has thrown a big challenge to the scientific community to devise efficient methods to purify contaminated water to such a high level. Though literature abounds in occurrence of groundwater contamination by arsenic and its removal from drinking water by laboratory techniques, millions of people continue to suffer, particularly in the developing countries like India (Bangladesh, West Bengal). Through a comprehensive review of the existing literature on the occurrence, causes, impacts and remedial measures, this article finds out what has gone wrong and what is to be done with special emphasis on membrane-based separation that seems to be highly promising in purifying arsenic-contaminated groundwater to a WHOprescribed level.

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Section: Membrane-based Processes For Purification Of Arsenic-contamisupporting

confidence: 56%

Section: Membrane-based Processes For Purification Of Arsenic-contamimentioning

confidence: 99%

Contamination of groundwater by arsenic: a review of occurrence, causes, impacts, remedies and membrane-based purification

Pal¹,

Sen²,

Manna³

et al. 2009

Journal of Integrative Environmental Sciences

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show abstract

“…Urase et al [11] conducted an experiment to remove arsenic from water using a flat sheet type aromatic polyamide NF membrane, ES-10, supplied by Nitto-Denko Co. Ltd. It was found that the removal of arsenite (As(III)) decreased significantly with decreasing pH from 89 % at pH 10 to 50 % at pH 3, while the decrease in removal of arsenate (As(V)) was smaller than that of arsenite.…”

Section: Introductionmentioning

confidence: 99%

Nanofiltration Membrane Process for the Removal of Arsenic from Drinking Water

et al. 2007

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The removal of arsenic from drinking water by nanofiltration membranes was investigated. Experiments were conducted with tap water to which arsenate and arsenite were added. Two types of nanofiltration membranes, i.e., NF-90 and NF-200, have been tested. The effect of various operating conditions, e.g., applied pressure, feed concentration, pH and temperature, were also investigated. The pH and arsenic concentration in the feed and the operating temperature are found to be decisive factors in determining the arsenic concentration remaining in the permeate. The level of removal of As(V) was higher than 98 % for both membranes, but that of As(III) was much lower. It can be concluded that by controlling the operating parameters, source water containing As(V) may be recovered as drinking water to EPA maximum contaminant level quality standards, but that water containing As(III) must undergo a pre-oxidation treatment before passing through the nanofiltration membrane in order to maintain drinking water quality.

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“…In Donnan exclusion, charges on the nanofilter repel chemical species of the same charge and hinder their movement through the membrane. Many nanofilters have negative surface charges that are capable of filtering out arsenic oxyanions (Brandhuber and Amy, 1998, 3;Urase, Oh and Yamamoto, 1998). Brandhuber and Amy (1998) and Shih (2005) provide concise summaries of arsenic removal with different types of membranes.…”

Section: Types Of Membranesmentioning

confidence: 99%

“…Nanofiltration can be done at lower pressures (as low as 0.1 MPa (∼15 psi)) to save energy. However, the membranes will not capture as much arsenic (Urase, Oh and Yamamoto, 1998).…”

Section: Nanofiltrationmentioning

confidence: 99%

Waste Treatment and Remediation Technologies for Arsenic

Henke

2009

Arsenic

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Effect of pH on rejection of different species of arsenic by nanofiltration

Cited by 119 publications

References 5 publications

Contamination of groundwater by arsenic: a review of occurrence, causes, impacts, remedies and membrane-based purification

Contamination of groundwater by arsenic: a review of occurrence, causes, impacts, remedies and membrane-based purification

Nanofiltration Membrane Process for the Removal of Arsenic from Drinking Water

Waste Treatment and Remediation Technologies for Arsenic

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