 Introduction Discovering the Problem Arsenic in Nature Source of Contamination Arsenicosis: Toxic Effects Feature of Arsenicosis Confirmation of Diagnosis Treatment Arsenic Detection De-arsination Control Measures WHO Recommendations Contact us © Copyright: MIG 1998 |
Arsenic
Contamination of Drinking Water De-arsination In Bangladesh, following de-arsination methods are used:
Arsenic Removal Chemical Method This method has been developed by the Department of Occupational and Environmental Health of NIPSOM, which is based on the principle of iron coagulation with a pre-oxidation step. Removal of arsenic by this method is almost 99%. Alum Method This cheap method allows 70% removal of arsenic. 300-500 grams of alum wrapped in a clean cloth is sinked in a bucket full of arsenic contaminated water for 12 hours. Upper 2/3rd of the water is separated using decantation or two layered clean cloth. Lower third of water contains arsenic and not suitable for drinking. Ferric oxide-manganese dioxide clay based filter columns This earthen column packed with the above substances is attached to the tube well outlet. The method is claimed to remove significant amount of arsenic at the water flow rate of 90-110 ml/minute and the system can filter up to 5000 L of water before disposal. © Copyright: Medical Information Group
(MIG) 1998 |
