title: Bacterial removal in flow-through columns packed with iron-manganese bimetallic oxide-coated sand.
abstract: The objective of this study was to investigate the performance of iron-manganese bimetallic oxide-coated sand (IMCS) in the removal of bacteria (Escherichia coli ATCC 11105) using small-scale (length = 20 cm, inner diameter = 2.5 cm) and 30-day long-term (length = 50 cm, inner diameter = 2.5 cm) column experiments. Results indicated that the bacterial removal capacity of IMCS (q(eq) = 0.66 g/g) was slightly lower than that of iron oxide-coated sand (ICS) (q(eq) = 0.69 g/g) but about two times greater than those of manganese oxide-coated sand (MCS, q(eq) = 0.30 g/g) and dual media containing ICS and MCS (q(eq) = 0.35 g/g). In IMCS, increasing the flow rate from 0.5 to 3.0 mL/min decreased the removal capacity from 1.14 to 0.64 g/g. Nitrate showed an enhancement effect on the removal capacity of IMCS at 1 and 10 mM, while phosphate and bicarbonate had both hindrance (1 mM) and enhancement (10 mM) effects, depending on their concentrations. The long-term column experiment (bacterial injection conc. = 4.2 × 10(6) CFU/mL) showed that IMCS could remove more than 99.9 % of bacteria within 13 days (effluent conc. = 1.6 × 10(2) CFU/mL). This study demonstrated that IMCS could be used as an adsorptive filter medium for bacterial removal in water treatment.
authors.affiliation: Department of Bioresources and Rural Systems Engineering, Hankyong National University, Anseong, Korea.
authors.forename: Seong-Jik
authors.initials: SJ
authors.lastname: Park
authors.forename: Chang-Gu
authors.initials: CG
authors.lastname: Lee
authors.forename: Song-Bae
authors.initials: SB
authors.lastname: Kim
authors.forename: Yoon-Young
authors.initials: YY
authors.lastname: Chang
authors.forename: Jae-Kyu
authors.initials: JK
authors.lastname: Yang
mesh_terms: D001639:Bicarbonates; D004926:Escherichia coli / Q000302:isolation & purification* / Q000378:metabolism; D005290:Ferric Compounds / Q000737:chemistry / Q000378:metabolism*; D005374:Filtration / Q000379:methods*; D017895:Manganese Compounds / Q000737:chemistry / Q000378:metabolism*; D009566:Nitrates; D010087:Oxides / Q000737:chemistry / Q000378:metabolism*; D010710:Phosphates; D012822:Silicon Dioxide / Q000737:chemistry / Q000378:metabolism*; D014871:Water Microbiology; D018508:Water Purification / Q000379:methods*
chemical_list: D001639:Bicarbonates; D005290:Ferric Compounds; D017895:Manganese Compounds; D009566:Nitrates; D010087:Oxides; D010710:Phosphates; C000499:ferric oxide; C027424:manganese oxide; D012822:Silicon Dioxide