出版社：Thai Society of Higher Eduction Institutes on Environment
摘要：Arsenic contamination in groundwater and its consequences to the human health has beenreported as one of the world’s biggest natural groundwater calamity to the mankind. Peoplein these aff ected states have chronically exposed to drinking Arsenic contaminated handtube-wells water. One of the urgent steps towards mitigation of arsenic contamination ingroundwater is supply of arsenic free or arsenic safe water. The main objective of this studywas selection of suitable electrode for effi cient removal of arsenic from groundwater usingthe method of electrocoagulation, which is a useful technique of contaminant removal. Thebatch mode experiments were carried out in rectangular glass cell, using diff erent electrodecombination of locally available materials such as mild steel (MS), aluminium (Al) andstainless steel (SS). The anode-cathode electrode combinations were MS-SS, MS-MS, MS-Al, Al-MS, Al-Al and Al-SS. These critical examinations had been performed under diff erentoperating condition including varying inter electrode distance, current, electrical chargeloading and As (III) to As (V) ratio. The others parameters on treated water such as Fe, pHand TDS also investigated. MS anode showed 81 - 95% As removal, performed signifi cantlywell as compared to Al anode with 21 - 27% As removal for similar conditions. MS-SS wasmore effi cient than MS-MS and MS-Al for higher arsenite to arsenate ratio. Decreasing ofinter electrode distance increased arsenic removal and energy consumption. In treated water,the concentration of Fe, pH, TDS varied 0.414 - 0.057 mg/L, 7.42 - 7.60, and 391 - 413 mg/L,respectively. Fe and TDS concentration decreased whereas pH increased from initial value.
