Enhanced treatment of Fischer-Tropsch (F-T) wastewater using the up-flow anaerobic sludge blanket coupled with bioelectrochemical system: Effect of electric field

• DOI: 10.1016/j.biortech.2017.02.010
• Publication Date: 2017-02-07T18:32:22Z
• Authors: Dexin Wang; Hongjun Han; Yuxing Han; Kun Li; Hao Zhu
• Keywords: Biological Oxygen Demand Analysis; Bacteria; Sewage; Wastewater; Waste Disposal, Fluid; 01 natural sciences; 6. Clean water; Biodegradation, Environmental; Bioreactors; Electricity; 13. Climate action; RNA, Ribosomal, 16S; Electrochemistry; Anaerobiosis; Organic Chemicals; 0105 earth and related environmental sciences

The coupling of bioelectrochemical system (BES) with an up-flow anaerobic sludge blanket (UASB) was established for enhanced Fischer-Tropsch (F-T) wastewater treatment while the UASB (control group) was operated in parallel. The presence of electric field could offer system a more reductive micro-environment that lower the ORP values and maintain the appropriate pH range, resulting in the higher chemical oxygen demand (COD) removal efficiency and methane production for BES-UASB (86.8% and 2.31±0.1L/(L·d)) while those values in control group were 72.1% and 1.77±0.08L/(L·d). In addition, the coupled system could promote sludge granulation to perform a positive effect on maintaining stability of pollutants removal. The high-throughput 16S rRNA gene pyrosequencing in this study further confirmed that the promoting direct interspecies electron transfer (DIET) between Geobacter and Methanosarcina might be established in BES-UASB to improve the syntrophic degradation of propionate and butyrate, finally facilitated completely methane production.