title: Removal of heavy metals from acid mine drainage using chicken eggshells in column mode.
abstract: Chicken eggshells (ES) as alkaline sorbent were immobilized in a fixed bed to remove typical heavy metals from acid mine drainage (AMD). The obtained breakthrough curves showed that the breakthrough time increased with increasing bed height, but decreased with increasing flow rate and increasing particle size. The Thomas model and bed depth service time model could accurately predict the bed dynamic behavior. At a bed height of 10 cm, a flow rate of 10 mL/min, and with ES particle sizes of 0.18-0.425 mm, for a multi-component heavy metal solution containing Cd2+, Pb2+and Cu2+, the ES capacities were found to be 1.57, 146.44 and 387.51 mg/g, respectively. The acidity of AMD effluent clearly decreased. The ES fixed-bed showed the highest removal efficiency for Pb with a better adsorption potential. Because of the high concentration in AMD and high removal efficiency in ES fixed-bed of iron ions, iron floccules (Fe2(OH)2CO3) formed and obstructed the bed to develop the overall effectiveness. The removal process was dominated by precipitation under the alkaline reaction of ES, and the co-precipitation of heavy metals with iron ions. The findings of this work will aid in guiding and optimizing pilot-scale application of ES to AMD treatment.
authors.affiliation: School of Environment and Energy, South China University of Technology, Guangzhou 510006, China.
authors.forename: Ting
authors.initials: T
authors.lastname: Zhang
authors.affiliation: School of Environment and Energy, South China University of Technology, Guangzhou 510006, China.
authors.forename: Zhihong
authors.initials: Z
authors.lastname: Tu
authors.affiliation: School of Environment and Energy, South China University of Technology, Guangzhou 510006, China; The Key Laboratory of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, Guangzhou 510006, China; Guangdong Provincial Engineering and Technology Research Center for Environmental Risk Prevention and Emergency Disposal, Guangzhou 510006, China. Electronic address: GNLu@foxmail.com.
authors.forename: Guining
authors.initials: G
authors.lastname: Lu
authors.affiliation: Water Supply Management Center of Guangzhou Development District, Guangzhou 510663, China.
authors.forename: Xingchun
authors.initials: X
authors.lastname: Duan
authors.affiliation: School of Environment and Energy, South China University of Technology, Guangzhou 510006, China; The Key Laboratory of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, Guangzhou 510006, China.
authors.forename: Xiaoyun
authors.initials: X
authors.lastname: Yi
authors.affiliation: School of Environment and Energy, South China University of Technology, Guangzhou 510006, China; The Key Laboratory of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, Guangzhou 510006, China.
authors.forename: Chuling
authors.initials: C
authors.lastname: Guo
authors.affiliation: School of Environment and Energy, South China University of Technology, Guangzhou 510006, China; The Key Laboratory of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, Guangzhou 510006, China.
authors.forename: Zhi
authors.initials: Z
authors.lastname: Dang
mesh_terms: D000327:Adsorption; D000818:Animals; D002645:Chickens; D002681:China; D004528:Egg Shell / Q000737:chemistry*; D007501:Iron / Q000737:chemistry; D019216:Metals, Heavy / Q000032:analysis / Q000302:isolation & purification*; D008906:Mining; D010316:Particle Size; D014874:Water Pollutants, Chemical / Q000032:analysis / Q000302:isolation & purification*; D018508:Water Purification / Q000295:instrumentation / Q000379:methods; D014961:X-Ray Diffraction
chemical_list: D019216:Metals, Heavy; D014874:Water Pollutants, Chemical; D007501:Iron
keywords: Acid mine drainage; Eggshells; Element mapping; Fixed bed; Thomas model