Review on the removal of Arsenic in groundwater using laterite adsorbent

Abstract

Contaminated removal in groundwater by adsorption studies on red earth material or laterite concrete is one of the cost-effective method in recent days. The objective of this study is to discuss the using of laterite in its natural or modified forms for removing arsenic from contaminated groundwater and its effects on key removal process variables like adsorbent dosage, pH, …It has advantages in cost, and popularity of laterite in some regions. Natural laterite materials could be treated in arsenic-contaminated groundwater with an efficacy of nearly 90%. Moreover, these materials may be chemically modified which enhanced the adsorption efficiency better than the raw ones 40 times in some situations and the removal efficacy is nearly 99% which passed the WHO safe limit standard for arsenic-contaminated groundwater (<10 μg L⁻¹). In addition, they can be also reused after the desorption process. Also, the research using available and easy access in developing regions requires less capital investment and has a smaller environmental impact.