Arsenic Remediation by Synthetic and Natural Adsorbents

[...]due to continuous enhancement in environmental pollution, remediation techniques are still needed to achieve the drinking water quality standard. Keywords: Arsenic removal, Metal toxicity, Water purification, Removal techniques, Low cost adsorbents Introduction Metals toxicity is serious health concern due to their chronic and acute toxicity, specifically heavy metals have tendency to aggravate the different cancers. According to the World Health Organization (WHO) classification, arsenic has been label as a first group carcinogenic substance [18]. Mining of coal or other rocks, fossil fuel burning and casting of non-iron metals has been found the main industrial methods that contribute to anthropogenic As impurities in water [20]. Study showed that about 70 % of Arsenic production is due to copper chrome arsenate (CCA) used timber treatment where as 22%is produced in agricultural chemicals other may be in glass, non-ferrous alloys and pharmaceuticals [21]. The maximal amounts of arsenic that might be released from soils in extremely acidic (pH < 2) or extremely alkaline (pH > 9) conditions depend on the total arsenic concentration. [...]the high and worst contamination of arsenic in ground water is observed and reported in Asian countries, mainly in India, Pakistan, Bangladesh and West Bengal, [32-34]. In these both areas the drinking resources to the population are water supply and tube-wells and 79.9 million and 42.7 million natives are using the contaminated water which has arsenic concentrations above then 50 gg/L [37, 38]. According to the WHO and US-EPA, the maximum concentration of arsenic is allowed in drinking water is...