Arsenic removal from drinking water by flocculation and microfiltration

Han, Binbing; Runnells, Timothy; Zimbron, Julio; Wickramasinghe, Ranil

doi:10.1016/s0011-9164(02)00425-3

Cited by 183 publications

(67 citation statements)

References 6 publications

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“…These techniques include nanofiltration (NF) and sorption/ion-exchange [22][23][24], precipitation [25], coagulation and flocculation [26][27][28][29], reverse osmosis (RO) [30,31], membrane technologies [19,26,32], electro-dialysis (ED) [33], biological processes [34] as well as lime softening [35]. While the aforementioned techniques are effective in removing arsenic species from aqueous media, they are costly and very often ineffective in reaching the regulatory limit of 10 mg L À1 .…”

Section: Water and Soil Contamination Remediationmentioning

confidence: 99%

Nanostructures in environmental pollution detection, monitoring, and remediation

Vaseashta

Václavíková

Vaseashta

et al. 2007

Science and Technology of Advanced Materials

174

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We present preliminary results of our joint investigations to monitor and mitigate environmental pollution, a leading contributor to chronic and deadly health disorders and diseases affecting millions of people each year. Using nanotechnology-based gas sensors; pollution is monitored at several ground stations. The sensor unit is portable, provides instantaneous ground pollution concentrations accurately, and can be readily deployed to disseminate real-time pollution data to a web server providing a topological overview of monitored locations. We are also employing remote sensing technologies with high-spatial and spectral resolution to model urban pollution using satellite images and image processing. One of the objectives of this investigation is to develop a unique capability to acquire, display and assimilate these valuable sources of data to accurately assess urban pollution by real-time monitoring using commercial sensors fabricated using nanofabrication technologies and satellite imagery. This integrated tool will be beneficial towards prediction processes to support public awareness and establish policy priorities for air quality in polluted areas. The complex nature of environmental pollution data mining requires computing technologies that integrate multiple sources and repositories of data over multiple networking systems and platforms that must be accurate, secure, and reliable. An evaluation of information security risks and strategies within an environmental information system is presented. In addition to air pollution, we explore the efficacy of nanostructured materials in the detection and remediation of water pollution. We present our results of sorption on advanced nanomaterials-based sorbents that have been found effective in the removal of cadmium and arsenic from water streams. r

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Section: Water and Soil Contamination Remediationmentioning

confidence: 99%

Nanostructures in environmental pollution detection, monitoring, and remediation

Vaseashta

Václavíková

Vaseashta

et al. 2007

Science and Technology of Advanced Materials

174

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“…The WHO, the European Union, and several other countries also lowered their recommended or required arsenic limit to 10 g/L in drinking water. As a result of the lower MCL, many methods have been developed to remove excessive arsenate from water, namely, adsorption, coagulation, ion exchange, precipitation, electrolysis, and reverse osmosis [4][5][6][7][8]. Among them, adsorption was regarded as a reliable and economical technique.…”

Section: Introductionmentioning

confidence: 99%

Arsenate removal from aqueous solutions using modified red mud

Zhang

Liu

Luan

et al. 2008

Journal of Hazardous Materials

106

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“…DOM with an average molecular weight of 35,000 Da or greater can cause chelation of arsenic and its subsequent removal by UF membranes. The technique however, cannot bring down arsenic concentration to 10 mg/l level and with a small charge on the surface, ultrafiltration membranes can separate arsenic only to some extent whereas microfiltration (pore size being of the order of 0.05 mm) can do so only with prior physico-chemical treatment like coagulation and flocculation as has been reported by Hering and Elmelech (1995) and Han et al (2002). Hsieh et al (2008) applied electric voltage (25 V) on an ultrafiltration membrane to achieve about 79% arsenic separation with reasonably high flux that resulted from applied electric voltage.…”

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

confidence: 91%

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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Arsenic removal from drinking water by flocculation and microfiltration

Cited by 183 publications

References 6 publications

Nanostructures in environmental pollution detection, monitoring, and remediation

Nanostructures in environmental pollution detection, monitoring, and remediation

Arsenate removal from aqueous solutions using modified red mud

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

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