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不同外电压下自养型生物阴极还原硫酸盐的性能及生物膜群落响应
摘要点击 186  全文点击 63  投稿时间:2018-06-20  修订日期:2018-07-09
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中文关键词  微生物电解系统(MES)  自养生物阴极  硫酸盐还原  外加电压  阴极微生物群落
英文关键词  microbial electrolysis system(MES)  autotrophic biocathode  sulfate reduction  applied voltage  cathodic bacterial community
作者单位E-mail
胡佳萍 中山大学环境科学与工程学院, 广东省环境污染控制与修复技术重点实验室, 广州 510275 jiapinghu5@foxmail.com 
曾翠平 中山大学环境科学与工程学院, 广东省环境污染控制与修复技术重点实验室, 广州 510275  
骆海萍 中山大学环境科学与工程学院, 广东省环境污染控制与修复技术重点实验室, 广州 510275 luohp5@mail.sysu.edu.cn 
刘广立 中山大学环境科学与工程学院, 广东省环境污染控制与修复技术重点实验室, 广州 510275  
张仁铎 中山大学环境科学与工程学院, 广东省环境污染控制与修复技术重点实验室, 广州 510275  
卢耀斌 中山大学环境科学与工程学院, 广东省环境污染控制与修复技术重点实验室, 广州 510275  
中文摘要
      微生物电解系统(microbial electrolysis system,MES)生物阴极还原去除环境污染物的过程中,外加电压的大小可显著影响其性能,阴极生物膜作为去除污染物的关键因子,其对外电压改变的响应尚属未知.本研究构建了双室MES,比较外电压为0.4、0.5、0.6、0.7和0.8 V情形下自养型生物阴极的硫酸盐还原特性及生物膜胞外聚合物和群落结构特征.结果表明,MES的输出电流、周期电荷量、COD去除量与外加电压(0.4~0.8 V)呈正相关关系;外加电压为0.4~0.8 V时,硫酸盐还原量随着电压的升高先升高后降低,在0.7 V时获得最大硫酸盐还原速率[78.9 g·(m3·d)-1]和最高S2-出水浓度(31.9 mg·L-1±2.2 mg·L-1);MES的电子回收率最高值为41.8%,推测产氢可能是电子损失的一个途径.阴极生物膜的聚多糖和蛋白量随外电压的升高而增加,0.8 V电压下的生物量比0.4 V提高了70%.阴极生物膜群落结构分析发现,Proteobacteria在门水平分布中占主导,Desulfovibrio在属水平分布中占主导,Desulfovibrio的相对丰度并未随着外加电压的升高发生明显的波动,表明Desulfovibrio在利用阴极呼吸代谢方面具有独特的优势.种水平分析发现,Desulfovibrio magneticus RS-1和s_unclassified_g_Desulfovibrio随着外电压的改变呈现相反的变化趋势.
英文摘要
      The removal efficiencies of environmental pollutants in a microbial electrolysis system (MES) with a biocathode are highly affected by the externally applied voltage. Although the cathode biofilm plays a key role in the pollution removal, its response to the applied voltage is still unknown. A two-chambered MES with a biocathode was constructed to study the impact of the different applied voltages (0.4, 0.5, 0.6, 0.7, and 0.8 V) on the sulfate reduction, extracellular polymer formation, and cathodic bacterial community. The results show that the current output and coulomb and COD removals of the MES are positively correlated with the applied voltage ranging from 0.4 to 0.8 V. The sulfate reduction rate first increases and then decreases with increasing voltage in the MES. The maximum sulfate reductive rate[78.9 g·(m3·d)-1] and maximum S2- production (31.9 mg·L-1±2.2 mg·L-1) were achieved at 0.7 V. The highest electron recovery efficiencies of the MES are 41.8%; hydrogen production may be a pathway leading to electron loss. The polysaccharide and protein contents of the cathode biofilm increase with increasing voltage. The cathode biomass at 0.8 V is 70% higher than that at 0.4 V. The high throughput sequencing results show that Proteobacteria and Dsulfovibrio are dominant in the cathodic microbial community at the phylum and genus levels, respectively. The relative abundance of Desulfovibrio shows little variation with the increasing voltage, indicating that Desulfovibrio is of advantage for using the cathode as electron donor for the respiratory metabolism. With the increasing voltage, the distribution of Desulfovibrio at species level indicates that the changes of Desulfovibriox magneticus RS-1 and s_unclassified_g_Desulfovibrio are contrary.

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