Use of a Liter-Scale Microbial Desalination Cell As a Platform to Study Bioelectrochemical Desalination with Salt Solution or Artificial Seawater
Use of a Liter-Scale Microbial Desalination Cell As a Platform to Study Bioelectrochemical Desalination with Salt Solution or Artificial Seawater
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DOI：
10.1021/es200127p
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发表时间：
2011-05-15
影响因子：
11.4
通讯作者：
He, Zhen
中科院分区：
文献类型：
--
作者：
Jacobson, Kyle S.;Drew, David M.;He, Zhen
由于生物能源生产以及废水处理和海水淡化一体化，生物电化学海水淡化具有潜在的优势。在这项工作中，评估了升级上流式微生物脱盐电池（UMDC）的性能和能源效益。 UMDC对盐溶液（NaCl）和人工海水进行脱盐，总溶解固体（TDS）的去除率随着水力停留时间的增加而增加，尽管人工海水中TDS的降低低于盐溶液。我们的分析表明，发电是去除 TDS 的主要因素（超过 70%），其他因素，如水渗透和未知过程，也有助于 TDS 降低。鉴于能源效率高，在处理盐溶液时，由于能源生产量的原因，与高电流发电相比，在高功率输出的情况下运行UMDC更为有利；而海水淡化更需要高电流发电，因为废水中的盐度较低。在高功率输出的情况下，假设 UMDC 作为与反渗透 (RO) 系统相关的预淡化装置，UMDC 产生的电能可能占下游 RO 系统所需能量的 58.1%（盐溶液）和 16.5%（人造海水）。我们的结果证明了生物电化学海水淡化的巨大潜力。
Bioelectrochemical desalination is potentially advantageous because of bioenergy production and integrated wastewater treatment and desalination. In this work, the performance and energy benefits of a liter-scale upflow microbial desalination cell (UMDC) were evaluated. The UMDC desalinated both salt solution (NaCl) and artificial seawater, and the removal rate of total dissolved solid (TDS) increased with an increased hydraulic retention time, although TDS reduction in artificial seawater was lower than that in salt solution. Our analysis suggested that electricity generation was a predominant factor in removing TDS (more than 70%), and that other factors, like water osmosis and unknown processes, also contributed to TDS reduction. It was more favorable given the high energy efficiency, when treating salt solution, to operate the UMDC under the condition of high power output compared with that of high current generation because of the amount of energy production; while high current generation was more desired with seawater desalination because of lower salinity in the effluent. Under the condition of the high power output and the assumption of the UMDC as a predesalination in connection with a reversal osmosis (RO) system, the UMDC could produce electrical energy that might potentially account for 58.1% (salt solution) and 16.5% (artificial seawater) of the energy required by the downstream RO system. Our results demonstrated the great potential of bioelectrochemical desalination.