Arsenic (As) poisoning has now become one of the major global environmental worries including countries in South America, Africa, in the US and also in Europe to certain extent. In recent years, authorities have taken a more stringent attitude to As in the environment and the new standard on the maximum contaminant level (MCL) of 10 μg/L As in drinking water, recommended by the WHO (WHO, 1998), was accepted both within the European Union and in the USA by the EPA. However, due to absence of appropriate technology and also considering economic aspects many of the developing countries like Bangladesh are still following the old standard of 50 μg/L. Therefore, appropriate As removal technologies are of prime importance for all As-affected areas. To date, many technologies have been developed for As mitigation. Arsenic removal through adsorption is emerging as most feasible option because in most cases, the system is simple to operate and cost-effective. Effectiveness of adsorption-based methods depends primarily on the adsorbent used.
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