The use of agricultural products and by-products has been widely investigated as a replacement for current costly methods of removing heavy metals from water and wastewater. Some of the agricultural materials can be effectively used as a low-cost sorbent. Modification of agricultural by-product could enhance their natural capacity and add value to the by-product. In this review, an extensive list of sorbent literature has been compiled to provide a summary of available information on a wide range of low-cost agricultural product and by-product sorbent and their modification for removing heavy metals from water and wastewater.
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Upendra Kumar (2006) studied this question.
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