摘要
利用异化铁还原微生物可将高岭土中不溶性的Fe^3+还原成可溶性的Fe^2+,但是此过程中产生的Fe^2+能够被高岭土以及异化铁还原微生物吸附,从而影响高岭土中铁的异化还原。本文研究了pH、高岭土量、Fe^2+浓度、温度4个因素对高岭土吸附Fe^2+的影响;并采用Logistic方程拟合,研究Fe^2+及温度对高岭土中Fe^3+的生物还原特征。结果表明:pH、高岭土量、浓度、温度4个因素均会影响高岭土吸附Fe^2+,当Fe^2+吸附在高岭土和微生物菌体表面时,微生物的活性下降,同时高岭土表面Fe^3+的生物可利用性也降低,Fe^3+生物还原的最大速率减小。
Insoluble Fe^ 3+ in kaolin can be leached out as soluble Fe ^2+ with dissimilation iron-reducing microorganism. However, the produced Fe^ 2+ would affect iron reduction because of its adsorbing on kaolin and dissimilation iron-reducing microorganisms. Hence, the effects of pH, amount of kaolin, initial concentration of Fe^ 2+ and temperature on adsorption of Fe^ 2+ on kaolin were investigated. The bioreduction of Fe ^2+ and the effect of temperature on the reduction of Fe ^3+ in kaolin with Logistic equation were found. The results showed that pH, amount of kaolin, initial concentration of Fe^ 2+ and temperature had an impact on the adsorption of Fe^2+ . When the Fe^2+ adsorbed on kaolin and microbial, it would reduce the maximum rate of iron reduction due to the reduction of microbial activity and bioavailability of Fe3+ on kaolin surface.
出处
《微生物学杂志》
CAS
CSCD
2010年第3期43-49,共7页
Journal of Microbiology
基金
福建省科技厅重点项目(2008H0021)
福建师范大学闽江学者人才引进基金(DH-465)