Department of Chemical Engineering, Isfahan University of Technology, Isfahan 84156-83111, Iran E-mail:
Water Sci Technol. 2019 May;79(9):1746-1754. doi: 10.2166/wst.2019.174.
While microbial fuel cells are being considered as a tool for energy saving in wastewater treatment facilities, such applications in oil refineries pose a challenge due to harder acclimation of microorganisms. In this research, the effect of heat pretreating mixed culture microorganisms (MCM), and cell cross section, on the performance of a novel cell design with two cross sections (single chamber microbial fuel cells, with circular: SCMFC_CC and rectangular: SCMFC_RC cross section) fed batched with refinery wastewater were investigated. First, using original and heat pretreated MCM, the performance of SCMFC_CC in terms of chemical oxygen demand (COD) removal and electricity production was investigated. Then, using only the heat pretreated MCM, the electricity production of SCMFC_RC was measured and compared with that of SCMFC_CC. Heat pretreatment of MCM improved maximum open circuit voltage (OCV) and maximum power density generated by 14% and 16%, respectively. However, heat pretreatment reduced COD removal by about 4%. The performance of SCMFC_CC in terms of maximum OCV and power density compared to SCMFC_RC was improved by 41% and 279%, respectively. Heat treatment of MCM increases the electricity generation of the cell, while reducing the performance of COD reduction due to decreasing the microorganism varieties in the MCM.
虽然微生物燃料电池被认为是节能的工具，可用于污水处理厂，但在炼油厂中的应用却面临着微生物驯化难度大的挑战。在这项研究中，考察了混合培养微生物（MCM）的热预处理和细胞横截面对新型具有两个横截面的电池设计（单室微生物燃料电池，圆形：SCMFC_CC 和矩形：SCMFC_RC 横截面）的性能的影响，该电池设计采用分批处理炼油废水。首先，使用原始和热预处理的 MCM，考察了 SCMFC_CC 在化学需氧量（COD）去除和发电方面的性能。然后，仅使用热预处理的 MCM，测量了 SCMFC_RC 的发电情况，并与 SCMFC_CC 进行了比较。MCM 的热预处理分别提高了最大开路电压（OCV）和最大功率密度 14%和 16%。然而，热预处理使 COD 去除率降低了约 4%。与 SCMFC_RC 相比，SCMFC_CC 的最大 OCV 和功率密度性能分别提高了 41%和 279%。MCM 的热处理增加了电池的发电量，同时由于 MCM 中的微生物种类减少，降低了 COD 去除性能。
