摘要
以微生物燃料电池为研究工具,研究Rhodoferax ferrireducens(R.f)异化还原钒(Ⅴ)的过程。在对R.f进行NaVO3耐性驯化实验的基础上,考查NaVO3废水浓度、pH值和温度对R.f还原钒(Ⅴ)的影响。结果表明:适量钒元素对微生物生长具有促进作用,微生物的生长趋势及周期与钒(Ⅴ)的还原趋势及周期基本相同;初期由于钒化合物的生物效应促进葡萄糖消耗量增加,葡萄糖氧化分解过程产生小分子有机酸,使溶液pH降低,但钒(Ⅴ)还原过程需要H+的参与,且R.f异化作用也消耗部分小分子有机酸,后期溶液pH升高。经优化其培养条件为:温度30℃、搅拌速度150r/min、pH为7.5时,在NaVO3含量为300mg/L的钒废水中,R.f对钒(Ⅴ)的还原率为76%,细菌总数达到1.1×109cfu/mL。
The process of Rhodoferax ferrireducens（R.f ） dissimilatory reduction of V5＋ in waste water was studied by the means of microbial fuel cell（MFC）.Based on the inoculation test of tolerance to NaVO3 of R.f, the effects of NaVO3 concentration in the wastewater, pH and temperature on R.f reducing V5＋ were investigated.The results show that adequate vanadium can promote the growth of microbes, and the tendency and cycle of R.f growth are essentially the same as that of V5＋ reducing.In beginning period, the bioeffect of vanadium compound increases the consumption of glucose, and the glucose is oxidized to the small molecule organic acids, which leads to pH value fall.But H＋ should be engaged in V5＋ reduction, and the dissimilatory reduction of R.f will also consume some small molecule organic acids, which makes pH increase later.The optimized culture conditions are as follows：temperature 30 ℃, stirring speed 150 r/min, pH 7.5, NaVO3 concentration in the vanadium wastewater 300 mg/L.The reduction rate of V5＋ by R.f is 76%, and the total R.f count reaches 1.1×109 cfu/mL.
出处
《中国有色金属学报》
EI
CAS
CSCD
北大核心
2009年第9期1700-1705,共6页
The Chinese Journal of Nonferrous Metals
基金
国家自然科学基金资助项目(20876160)
国家高技术研究发展计划资助项目(2007AA05Z158)
"十一五"国家科技支撑计划资助项目(2006BAB02A11)
