Abstract
The effect of heat treatment for rice husk was investigated on the removal of arsenite in ground water by the adsorption onto the rice husk surface. The heat treatment was performed at the temperature from 80oC to 300oC in the closed system under anoxic environment. The continuous adsorption column method was applied for the removal of arsenite. The removal efficiency (75%) with rice husk treated at 150oC was better compared to those (54%) obtained with untreated rice husk. Therefore, the heat treatment of rice husk at relatively low temperature was effective for the enhancement of arsenic removal from water. The treatment conditions of As removal from aqueous solution were optimized. The developed treatment technique was applied into the real ground water sample in Bangladesh. The As concentration in sample water after treatment was approximately 18 and 8 μg/L, which was below the WHO guideline value of maximum admissible level of arsenic in ground water for Bangladesh (50 μg/L). The developed technique might become a potential avenue for simple and low cost arsenic removal methods.
Highlights
A general problem of recent years is the huge amounts of effluents resulted in aquatic systems (rivers, lakes, seaHow to cite this paper: Samad, A., Fukumoto, T., Dabwan, A.H.A., Katsumata, H., Suzuki, T., Furukawa, M. and Kaneco, S. (2016) Enhanced Removal of Arsenite from Ground Water by Adsorption onto Heat-Treated Rice Husk
The present study has dealt mainly with enhanced removal of arsenite from ground water by adsorption onto Rice husk (RH) treated at relatively low temperature
The efficiencies with heat treated RH increased to 60% - 74%
Summary
A general problem of recent years is the huge amounts of effluents resulted in aquatic systems (2016) Enhanced Removal of Arsenite from Ground Water by Adsorption onto Heat-Treated Rice Husk. Arsenite is 25 - 60 times more toxic than arsenate [2], and has less efficiency to the surface of various adsorbents compared with As(V) because As(III) exists mainly as nonionic H3AsO3 in natural water with pH value ranging from weakly acidic to weakly alkaline [3] [4]. The direct use of rice husk for arsenic removal has been reported in the recent studies [5] [9] [10]. There is little information on the As(III) removal in water with rice husk heated at relatively low temperature. The present study has dealt mainly with enhanced removal of arsenite from ground water by adsorption onto RH treated at relatively low temperature
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