Abstract:A strain of sulfate reducing bacteria SRB2, which could generate the biological iron sulfide composites, was isolated by using the Hungate anaerobic technique. The influences of pH, temperature, stirring speed, and dosage on the removal of Cu2+ from wastewater by biological iron sulfide composites were investigated. Meanwhile the mechanism of reducing remove Cu2+ through replacement approach and EPS adsorption approach were studied. Cu2+ reduction rate increased with the increase of dosage and temperature. At 35℃, pH4.0, stirring speed of 100r/min, when the dosage of biological iron sulfide composites reached 0.6661g, the removal rate of Cu2+ could be above 99.9% within 2 min. Therefore, great prospects exist for the application of biological iron sulfide composites in the emergency treatment of copper-contaminated wastewater and heavy metal pollution. The replacement approach with a removal rate of 90.9%, predominated in the process of reducing Cu2+,while the EPS adsorption approach which removed 38% of the Cu2+ in 24 h, was not preponderant in the process of reducing Cu2+.
罗丽卉, 谢翼飞, 李旭东. 生物硫铁复合材料处理含铜废水及机理研究[J]. 中国环境科学, 2012, 32(2): 249-253.
LUO Li-Hui, XIE Yi-Fei, LI Xu-Dong. Biological iron sulfide composites in the treatment of copper-contaminated wastewater and its mechanism. CHINA ENVIRONMENTAL SCIENCECE, 2012, 32(2): 249-253.