生物硫铁复合材料处理含铜废水及机理研究

利用Hungate分离出一株产生物硫铁复合材料(生物硫铁)的硫酸盐还原菌SRB2,考察了投加量、pH值、温度、搅拌速度对生物硫铁处理含铜废水的影响,并分别从化学置换、胞外聚合物(EPS)吸附等途径研究了生物硫铁去除Cu2+的机理.结果表明,生物硫铁投加量越大、温度越高对铜的去除效果最好,在pH4.0、35℃、0.6661g生物硫铁、搅拌速度100r/min时,2min即可使Cu2+去除率达到99.9%以上.化学置换途径在生物硫铁去除Cu2+时占主导地位,10min去除率达90.9%,EPS吸附途径在生物硫铁去除Cu2+过程中不占优势,24h去除率为38%.

Biological iron sulfide composites in the treatment of copper-contaminated wastewater and its mechanism

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+.