Arsenic removal by reverse osmosis

Ning, Robert Y.

doi:10.1016/s0011-9164(02)00262-x

Cited by 346 publications

(149 citation statements)

References 7 publications

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“…3 This problem is also present in the American continent, in countries such as Argentina, Mexico, Chile, Peru, United States, Brazil and Canada. 4,5 For these reasons, the U. S. Environmental Protection Agency has set the amount of 10 μg L −1 as the maximum level of pollution allowed in potable water. 6 Thus, several alternatives have been studied in order to solve this problem.…”

Section: Introductionmentioning

confidence: 99%

Kinetic modeling of the alkaline decomposition of potassium arsenojarosite

Flores

Patiño

Reyes

et al. 2012

J. Braz. Chem. Soc.

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Uma amostra de arsenojarosita de potássio foi sintetizada e completamente caracterizada. A amostra obtida é uma solução sólida de arsenojarosita de potássio, cuja fórmula aproximada é [K 0,75 3.66 ]. The decomposition process in alkaline medium was studied in the induction and progressive conversion periods, and the reaction order and activation energy were determined for each case. Under the used experimental conditions, results are consistent with the spherical particle model with decreasing core and chemical control. In both processes, four partial models and two global models were developed in order to describe their basic behavior. The models were validated, and it was proved that they favorably describe the decomposition process in alkaline medium.

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Section: Introductionmentioning

confidence: 99%

Kinetic modeling of the alkaline decomposition of potassium arsenojarosite

Flores

Patiño

Reyes

et al. 2012

J. Braz. Chem. Soc.

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“…diabetes) disorders. Besides its tumorigenic potential, arsenic has been shown to be genotoxic (Ning 2002).…”

Section: Occurrence and Causes Of Arsenic Contamination Of Groundwatermentioning

confidence: 99%

“…Though genetic modifications of the microbes can enhance this oxidation efficiency this has inherent potential of damaging ecosystem (Chatterjee 2000). Ning (2002) had reviewed the removal mechanism of RO and concluded that arsenic in the commonly high oxidation states of (V) is very effectively removed by RO. With further attention to the removal of the weakly acidic arsenic (III) species in waters by the operation of RO at sufficiently high pH values made possible by the newer anti-scalants.…”

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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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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“…Various technologies practiced for arsenic removal from ground water based on various principles are namely, chemical coagulation and precipitation [2]; oxidation [3]; biological process [4]; electrocoagulation [5]; adsorption on various materials such as alumina [6], Fe or Mn oxi-hydroxides [7] or zerovalent iron corrosion products [8] etc. ; reverse osmosis [9]; membrane filtration/ nanofiltration [10]; and ion exchange [11]. Most importantly, none of these technologies has been universally accepted in terms of both cost effectiveness as well as efficiency in removal of arsenic below permissible limit.…”

Section: Introductionmentioning

confidence: 99%

Arsenic Removal from Contaminated Water by Various Physicochemical Processes

Rao¹,

Ngullie²,

Golder³

et al. 2015

IJESD

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Abstract-Efficiency of ion exchange, electro membrane, and electrochemical ion-exchange (EIX) processes on arsenic removal were evaluated in laboratory. Batch studies were performed with chloride (IRA410) as well as hydroxyl (modified IRA410) exchangeable forms of anion exchange resins (AER), whereas, column study was done with only hydroxyl exchangeable AER to evaluate its performance on arsenic removal. A plate and frame type electrolytic cell with ruthenium dioxide coated titanium plates (RuO 2 /Ti) as anode, and stainless steel plates as cathode, was fabricated to do experiment to evaluate the performance on arsenic removal by electro membrane as well as EIX processes. Though, As(V) removal was significant during batch kinetic study, As(III) removal was poor by both the AER. Breakthrough curves were developed by passing As(V) contaminated water at a flow rate of 5 ml/min through 3 different bed depths of 5 cm, 7.5 cm, and 10 cm of modified IRA410 columns having 1 cm internal diameter. The columns could efficiently remove from 500 µg/l of As(V) contaminated water to below 10 µg/l. In electro membrane process, effects of electrolyte concentration, effects of applied voltage, and initial concentration of As(V) were evaluated. EIX process was found to be inefficient in removing As(V) from contaminated water.

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Arsenic removal by reverse osmosis

Cited by 346 publications

References 7 publications

Kinetic modeling of the alkaline decomposition of potassium arsenojarosite

Kinetic modeling of the alkaline decomposition of potassium arsenojarosite

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

Arsenic Removal from Contaminated Water by Various Physicochemical Processes

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