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Abstract
Water treatment with metal coagulants like alum and ferric chloride has long been recognised as an effective method for removal of arsenic. NEERI conducted coagulation ‐ flocculation studies on arsenic removal on water samples collected from six sources in West Bengal which are affected by arsenic. The physico‐chemical characteristics of these water samples were investigated. Extensive treatability studies have shown that a dose of 3.0 mg/L of chlorine (for pre‐chlorination) followed by 50 mg/L of ferric chloride was able to remove arsenic from the raw waters. Results of arsenic removal are discussed.
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