title: Feasibility of bioleaching combined with Fenton-like reaction to remove heavy metals from sewage sludge.
abstract: Feasibility of bioleaching combining with Fenton-like reaction to remove heavy metals from sewage sludge was investigated. After 5-day bioleaching, the sludge pH decreased from 6.95 to 2.50, which satisfied the acidic conditions for Fenton-like reaction. Meanwhile, more than 50% of sludge-borne heavy metals were dissolved except for Pb. The bioleached sludge was further oxidized with Fenton-like reaction, with an optimal H2O2 dosage of 5 g/L, the Cu, Zn, Pb and Cd removal reached up to 75.3%, 72.6%, 34.5% and 65.4%, respectively, and the residual content of heavy metals in treated sludge meets the requirement of Disposal of Sludge from Municipal Wastewater Treatment Plant - Control Standards for Agricultural Use (CJ/T 309-2009) of China for A grade sludge. Bioleaching combined with Fenton-like reaction was the most effective method for heavy metal removal, compared with 15-day bioleaching and inorganic acid leaching with 10% H2SO4, 10% HCl and 10% HNO3.
authors.affiliation: College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China. zhuyi0731@126.com
authors.forename: Yi
authors.initials: Y
authors.lastname: Zhu
authors.forename: Guangming
authors.initials: G
authors.lastname: Zeng
authors.forename: Panyue
authors.initials: P
authors.lastname: Zhang
authors.forename: Chang
authors.initials: C
authors.lastname: Zhang
authors.forename: Miaomiao
authors.initials: M
authors.lastname: Ren
authors.forename: Jiachao
authors.initials: J
authors.lastname: Zhang
authors.forename: Ming
authors.initials: M
authors.lastname: Chen
mesh_terms: D005240:Feasibility Studies; D006861:Hydrogen Peroxide / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D019216:Metals, Heavy / Q000302:isolation & purification*; D012722:Sewage / Q000737:chemistry*; D012995:Solubility
chemical_list: D019216:Metals, Heavy; D012722:Sewage; D006861:Hydrogen Peroxide
keywords: Bioleaching; Fenton-like reaction; Heavy metal solubilization; Sewage sludge