title: Biosorption of copper by calcium alginate from excess activated sludge.
abstract: To evaluate the potential use of the bacterial alginate extracted from excess activated sludge as a sustainable copper bioadsorbent, dried alginate-Ca made from municipal excess activated sludge was characterized by atomic force microscopy, and tested in a batch system. The alginate-Ca yield from the activated sludge was 103 +/- 15 mg g(-1). The maximum Cu2+ uptake was 41.96 mg g(-1). Accumulation of Cu2+ reached equilibrium within 50 min and followed the Langmuir adsorption isotherm. The solution pH and initial Cu2+ concentration were critical for Cu2+ biosorption. The sludge alginate-Ca bioadsorbent could be regenerated by 100 mmol L(-1) HCl with 82% Cu2+ recovery. Calcium alginate from excess activated sludge was proved to be a good bioadsorbent for heavy metal elimination.
authors.affiliation: College of Environmental Science and Engineering, Ocean University of China, No. 238 Songling Road, Qingdao 266100, China.
authors.forename: Hai Ling
authors.initials: HL
authors.lastname: Zhang
authors.forename: Yue Mei
authors.initials: YM
authors.lastname: Lin
authors.forename: Lin
authors.initials: L
authors.lastname: Wang
mesh_terms: D000327:Adsorption; D000464:Alginates / Q000737:chemistry* / Q000648:ultrastructure; D003300:Copper / Q000302:isolation & purification*; D020723:Glucuronic Acid / Q000737:chemistry; D006603:Hexuronic Acids / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D018625:Microscopy, Atomic Force; D012722:Sewage / Q000737:chemistry*
chemical_list: D000464:Alginates; D006603:Hexuronic Acids; D012722:Sewage; D003300:Copper; D020723:Glucuronic Acid