title: Fe and Mn removal from mining drainage using goaf filling materials obtained from coal mining process.
abstract: Coal gangue, sandy soil and clay (mass ratio 45:4:1) as goaf filling materials acquired from coal mining processes were applied to remove Fe and Mn effectively from mining drainage. The results of an adsorption kinetic study showed that the Fe adsorption equation was y=21.454y+8.4712, R2=0.9924 and the Mn adsorption equation was y=7.5409x+0.905, R2=0.9957. Meanwhile, the goaf filling materials had low desorption capacity (Fe 6.765 μg/g, Mn 1.52 μg/g) and desorption ratio (Fe 8.98%, Mn 11.04%). Experiments demonstrated that Fe and Mn from mining drainage could be removed stably at a flow rate of 1.2 L/min, Fe inlet concentration of less than 40 mg/L, Mn inlet concentration of less than 2 mg/L and neutral or alkaline conditions. During a procedure of continuous experiments, the effluent quality could meet the requirement of the 'Code for Engineering Design of Sewage Regeneration-GB503352-2002'. A real-application project using goaf filling materials to treat mining drainage in Shendong coal mine showed that the average cost per ton of mining drainage was about 0.55 RMB, which could bring about considerable economic benefit for coal mining enterprises.
authors.affiliation: School of Chemical and Environmental Engineering, China University of Mining & Technology, Beijing, 100083 China E-mail: 1403561964@qq.com.
authors.forename: Liping
authors.initials: L
authors.lastname: Zhang
authors.affiliation: School of Chemical and Environmental Engineering, China University of Mining & Technology, Beijing, 100083 China E-mail: 1403561964@qq.com.
authors.forename: Aolei
authors.initials: A
authors.lastname: Chen
authors.affiliation: School of Chemical and Environmental Engineering, China University of Mining & Technology, Beijing, 100083 China E-mail: 1403561964@qq.com.
authors.forename: Hongbin
authors.initials: H
authors.lastname: Qu
authors.affiliation: School of Chemical and Environmental Engineering, China University of Mining & Technology, Beijing, 100083 China E-mail: 1403561964@qq.com.
authors.forename: Shouqiang
authors.initials: S
authors.lastname: Xu
authors.affiliation: School of Chemical and Environmental Engineering, China University of Mining & Technology, Beijing, 100083 China E-mail: 1403561964@qq.com.
authors.forename: Xue
authors.initials: X
authors.lastname: Zhang
authors.affiliation: School of Chemical and Environmental Engineering, China University of Mining & Technology, Beijing, 100083 China E-mail: 1403561964@qq.com.
authors.forename: Xuwen
authors.initials: X
authors.lastname: He
mesh_terms: D000327:Adsorption; D003031:Coal / Q000032:analysis; D003032:Coal Mining; D004322:Drainage; D052918:Environmental Restoration and Remediation / Q000379:methods*; D006863:Hydrogen-Ion Concentration; D007501:Iron / Q000737:chemistry*; D007700:Kinetics; D008345:Manganese / Q000737:chemistry*; D012722:Sewage / Q000737:chemistry*; D018508:Water Purification / Q000379:methods*
chemical_list: D003031:Coal; D012722:Sewage; D008345:Manganese; D007501:Iron