Biosorption of copper by calcium alginate from excess activated sludge.
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.
Zhang
Hai Ling
HL
College of Environmental Science and Engineering, Ocean University of China, No. 238 Songling Road, Qingdao 266100, China.
Lin
Yue Mei
YM
Wang
Lin
L
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*
D000464:Alginates; D006603:Hexuronic Acids; D012722:Sewage; D003300:Copper; D020723:Glucuronic Acid