title: Removal of earthy-musty odorants in drinking water by powdered activated carbon.
abstract: The removal of four earthy-musty compounds, 2-methylisoborneol (MIB), 2,4,6-trichloroanisole (TCA), 2-isopropyl-3-methoxy-pyrazine (IPMP), and 2-isobutyl-3-methoxy-pyrazine (IBMP), by powdered activated carbon (PAC) were investigated under the simulative condition of Xicun water plant, Guangzhou. The adsorption kinetics of odor compounds by two PACs show that main removal of odor compounds occurs within contact time of 1 h. Compared with the wood-based PAC, the coat-based PAC evidently improves the removal efficiency of poorly adsorbed compounds like MIB. The effects on removal efficiency such as optimum PAC dosage, initial concentration of the organics, chlorine residual, background organics, and changes of water quality were investigated. The percent removal of trace odorants at any given time for a particular carbon dosage is irrelative to the initial concentration of the odor compounds. Adsorptive capacity of PAC for target compounds is reduced by chlorine residual and background organics. Characteristics of raw water have vast influence on the removal of target compounds by PAC.
authors.affiliation: State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Beijing, China.
authors.forename: Cunzhen
authors.initials: C
authors.lastname: Liang
authors.forename: Dongsheng
authors.initials: D
authors.lastname: Wang
authors.forename: Min
authors.initials: M
authors.lastname: Yang
authors.forename: Wei
authors.initials: W
authors.lastname: Sun
authors.forename: Shifang
authors.initials: S
authors.lastname: Zhang
mesh_terms: D000327:Adsorption; D000840:Anisoles / Q000737:chemistry / Q000302:isolation & purification*; D001892:Camphanes / Q000737:chemistry / Q000302:isolation & purification*; D002244:Carbon / Q000737:chemistry; D002681:China; D002713:Chlorine / Q000737:chemistry; D009812:Odorants; D011719:Pyrazines / Q000737:chemistry / Q000302:isolation & purification*; D045483:Rivers; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*; D018508:Water Purification / Q000379:methods
chemical_list: D000840:Anisoles; D001892:Camphanes; D011719:Pyrazines; D014874:Water Pollutants, Chemical; C024267:2-isopropyl-3-methoxypyrazine; C005536:2-methylisoborneol; C110228:2,4,6-trichloroanisole; D002713:Chlorine; D002244:Carbon; C034376:2-isobutyl-3-methoxypyrazine