Arsenic (As) removal from drinking water represents a very important challenge, especially for developing countries where population is massively exposed to water resource problems. Treatments of water contaminated by As have been studied for long time by using different technologies such as cation exchange, lime softening, reverse osmosis, coagulation, and adsorption on synthetic materials such as zeolites (Chutia et al., 2008: Harleman et al., 2009; Jeon et al., 2009), activated carbon (Fierro et al., 2009), zero-valent iron (Cornejo et al., 2008), iron oxides (Katsoyiannis et al., 2002), titanium oxides (Bang et al., 2005), manganese oxides (Driehaus et al., 1994; Malyekkal et al., 2009) or granules and mixed oxides (Jeong et al., 2007; Fleming et al., 2009). However, low-cost processes that can be easily implemented for insulated populations and for developing countries such as Bangladesh, are minority (Chakraverty et al., 2002; van Halem et al., 2002; Gillman, 2006; Devi et al., 2008). In the present work, different natural materials (natural zeolites, natural iron oxide and pouzzolane) have been tested and compared to develop a low-cost filtration process for As removal from drinking water based on pouzzolane use as a sorbent for As.
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