Department of Energy, Environment, and Climate Change, School of Environment, Resources, and Development, Asian Institute of Technology, P.O. Box 4, Klong Luang, Pathumthani, 12120, Thailand.
Department of Energy, Environment, and Climate Change, School of Environment, Resources, and Development, Asian Institute of Technology, P.O. Box 4, Klong Luang, Pathumthani, 12120, Thailand.
Chemosphere. 2021 Dec;285:131549. doi: 10.1016/j.chemosphere.2021.131549. Epub 2021 Jul 12.
Osmotic microbial fuel cell (OsMFC) integrating forward osmosis into microbial fuel cell (MFC) favors the merits of organic removal, bioenergy generation, and high-quality water extraction from wastewater. This study demonstrated an 18.7% power density enhancement over a conventional MFC due to the water-flux-facilitated proton advection and net positive charge (NPC)-flux-promoted countercurrent proton exchange. Among the three examined membrane cleaning methods, chemical cleaning using 0.2% NaClO was found to be especially effective in removing organic foulants composed of proteins and polysaccharides, resulting in a water flux recovery of up to 91.6% with minimal impact on average maximum power density and internal resistance. The effects of operating parameters including anode HRT and draw solution concentration were studied. Shortening HRT from 6.0 to 3.0 h increased power density by 78.0% due to a high organic loading rate and a slightly reduced polarization concentration. Increasing draw solution concentration from 0.2 to 1.0 M NaCl enhanced power density by approximately 2.7-fold due to enhanced proton advection. Water-flux-facilitated proton advection played a more important role in determining the electricity generation performance of OsMFC than the NPC-flux-promoted countercurrent proton exchange under varied operating conditions.
渗透微生物燃料电池（OsMFC）将正向渗透技术与微生物燃料电池（MFC）相结合，有利于废水的有机物去除、生物能源生成和高品质水的提取。与传统 MFC 相比，由于水通量促进质子对流和净正电荷（NPC）通量促进反向质子交换，本研究使功率密度提高了 18.7%。在三种考察的膜清洗方法中，发现使用 0.2%NaClO 的化学清洗特别有效，可以去除由蛋白质和多糖组成的有机污染物，从而使水通量恢复率高达 91.6%，对平均最大功率密度和内阻的影响最小。研究了操作参数，包括阳极 HRT 和汲取液浓度的影响。将 HRT 从 6.0 小时缩短至 3.0 小时，由于高有机负荷率和略微降低的极化浓度，功率密度提高了 78.0%。将汲取液浓度从 0.2 M NaCl 增加到 1.0 M NaCl 可使功率密度提高约 2.7 倍，这是由于质子对流增强所致。在不同的操作条件下，水通量促进的质子对流在决定 OsMFC 的发电性能方面比 NPC 通量促进的反向质子交换更为重要。
