| 基质COD浓度对单室微生物电解池产甲烷的影响 |
| 摘要点击 2110 全文点击 1581 投稿时间：2014-08-22 修订日期：2014-10-16 |
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| 中文关键词 微生物电解池 产甲烷 生物阴极 化学需氧量 电压 |
| 英文关键词 microbial electrolysis cell methane production biocathode chemical oxygen demand voltage |
| 作者 | 单位 | E-mail | | 滕文凯 | 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 | tengwenkai@live.com | | 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 | | | 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 | | 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 | | | 符诗雨 | 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 | |
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| 中文摘要 |
| 单室微生物电解池(microbial electrolysis cells,MEC)产甲烷过程中,底物COD浓度可同时影响阳极和阴极微生物的活性. 为了探究COD浓度的影响,构建生物阴极型单室MEC,比较COD为700、1000、1350 mg·L-1情形下产甲烷速率和COD去除量随外加电压的变化规律,并计算MEC的能量效益. 结果表明,随着COD的增加,产甲烷速率和COD去除量均呈增大趋势. 随着外加电压的升高(0.3~0.7 V),低COD条件下MEC的产甲烷速率呈增大趋势,而在中、高COD 条件下,产甲烷速率随着外加电压的升高先增大后减小; COD去除量的变化规律与产甲烷速率一致. 当外加电压为0.5 V时,阴极电势降至最低值 (-0.694±0.001)V,有利于产甲烷菌的富集,从而获得最高的产甲烷速率和能量回收率 (约42.8%). COD浓度1000 mg·L-1和外加电压0.5 V时,MEC可获得最大的能量收益0.44 kJ±0.09 kJ(约1450 kJ·m-3). 最终结果表明,MEC可利用低浓度COD废水生产甲烷,并且可获得正的能量效益,这为废水中化学能量的回收利用提供了新的研究思路. |
| 英文摘要 |
| The chemical oxygen demand (COD) of substrate can affect the microbial activity of both anode and cathode biofilm in the single-chamber methanogenic microbial electrolysis cell (MEC). In order to investigate the effect of COD on the performance of MEC, a single chamber MEC was constructed with biocathode. With the change of initial concentration of COD (700, 1000 and 1350 mg·L-1), the methane production rate, COD removal and energy efficiency in the MEC were examined under different applied voltages. The results showed that the methane production rate and COD removal increased with the increasing COD. With the applied voltage changing from 0.3 to 0.7 V, the methane production rate increased at the COD of 700 mg·L-1, while it increased at first and then decreased at the COD of 1000 mg·L-1 and 1350 mg·L-1. A similar trend was observed for the COD removal. The cathode potential reached the minimum (-0.694±0.001) V as the applied voltage was 0.5 V, which therefore facilitated the growth of methanogenic bacteria and improved the methane production rate and energy efficiency of the MEC. The maximum energy income was 0.44 kJ±0.09 kJ (1450 kJ·m-3) in the MEC, which was obtained at the initial COD of 1000 mg·L-1 and the applied voltage of 0.5 V. Methanogenic MECs could be used for the treatment of wastewaters containing low organic concentrations to achieve positive energy production, which might provide a new method to recover energy from low-strength domestic wastewater. |
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