title: Practical performance and its efficiency of arsenic removal from groundwater using Fe-Mn binary oxide.
abstract: A treatment unit packed by granular adsorbent of Fe-Mn binary oxide incorporated into diatomite (FMBO(1:1)-diatomite) was studied to remove arsenic from anaerobic groundwater without any pre-treatment or post-treatment. The raw anaerobic groundwater containing 35-45 microg/L of arsenic was collected from suburb of Beijing. Arsenic (III) constituted roughly 60%-80% of the total arsenic content. Approximately 7,000 bed volumes (ratio of effluent volume to adsorbent volume) treated water with arsenic concentration below 10 microg/L were produced in the operation period of four months. The regeneration of FMBO (1:1)-diatomite had been operated for 15 times. In the first stage, the regeneration process significantly improved the adsorption capacity of FMBO (1:1)-diatomite. With increased loading amount of Fe-Mn binary oxide, the adsorption capacity for arsenic decreased 20%-40%. Iron and manganese in anaerobic groundwater were oxidized and adsorptive filtrated by FMBO (1:1)-diatomite efficiently. The final concentrations of iron and manganese in effluents were nearly zero. The continued safe performance of the treatment units proved that adsorbent FMBO (1:1)-diatomite had high oxidation ability and exhibited strong adsorptive filtration.
authors.affiliation: State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China. changff04@mails.gucas.ac.cn
authors.forename: Fangfang
authors.initials: F
authors.lastname: Chang
authors.forename: Jiuhui
authors.initials: J
authors.lastname: Qu
authors.forename: Ruiping
authors.initials: R
authors.lastname: Liu
authors.forename: Xu
authors.initials: X
authors.lastname: Zhao
authors.forename: Pengju
authors.initials: P
authors.lastname: Lei
mesh_terms: D000327:Adsorption; D001151:Arsenic / Q000737:chemistry*; D007692:Diatomaceous Earth / Q000737:chemistry*; D005290:Ferric Compounds / Q000737:chemistry*; D005618:Fresh Water / Q000737:chemistry*; D017895:Manganese Compounds / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning; D010087:Oxides / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D018508:Water Purification / Q000379:methods*
chemical_list: D005290:Ferric Compounds; D017895:Manganese Compounds; D010087:Oxides; D014874:Water Pollutants, Chemical; C000499:ferric oxide; D007692:Diatomaceous Earth; C027424:manganese oxide; C033787:diatomite; D001151:Arsenic