Biological filtration for removal of arsenic from drinking water.
The main objective of the study was to find a suitable iron to arsenic ratio in water to reduce arsenic to 5 microg/L or lower through sand filtration. Experiments were conducted by varying the quantity of iron(II) while keeping the arsenic concentration at 100 microg/L. A mixture of iron (II) and arsenic at different ratios (10:1, 20:1, 30:1 and 40:1) was pumped to the sand filters in a down flow mode and effluent arsenic and iron were analyzed. It was found that a ratio of iron to arsenic of 40:1 was necessary to ensure an effluent arsenic concentration of 5 microg/L or lower. Iron in the filtrate was found to be below 0.1 mg/L at all times.
Pokhrel
Damodar
D
Stantec Consulting Ltd, Regina, SK, Canada.
Viraraghavan
Thiruvenkatachari
T
D000327:Adsorption; D001151:Arsenic / Q000737:chemistry*; D001419:Bacteria / Q000378:metabolism*; D001673:Biodegradation, Environmental; D005374:Filtration; D007501:Iron / Q000737:chemistry / Q000378:metabolism; D012822:Silicon Dioxide; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D018508:Water Purification / Q000379:methods*; D014881:Water Supply
D014874:Water Pollutants, Chemical; D012822:Silicon Dioxide; D007501:Iron; D001151:Arsenic