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Enhanced treatment of coal gasification wastewater in a membraneless sleeve-type bioelectrochemical system.

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Title: Enhanced treatment of coal gasification wastewater in a membraneless sleeve-type bioelectrochemical system.
Authors: Yang, Li-Hui1 (AUTHOR), Cheng, Hao-Yi1 (AUTHOR) chenghaoyihit@126.com, Ding, Yang-Cheng1 (AUTHOR), Su, Shi-Gang1 (AUTHOR), Wang, Bo1 (AUTHOR), Zeng, Ran1 (AUTHOR), Sharif, Hafiz Muhammad Adeel1 (AUTHOR), Wang, Ai-Jie1 (AUTHOR)
Source: Bioelectrochemistry. Oct2019, Vol. 129, p154-161. 8p.
Subjects: Therapeutics, Sewage, Wastewater treatment, Phenol, Physiological control systems, Coal gasification
Abstract: A bioelectrochemical system (BES) is a technology with potential for accelerating the degradation of recalcitrant compounds, the components and configurations of which are important for treatment performance. In the present work, a membraneless sleeve-type BES (termed BioE) was designed for the treatment of synthetic coal gasification wastewater (CGW, phenol as a model pollutant) and real CGW. Compared with the biological control (termed Bio), the phenol removal rate and COD removal efficiency increased by 2.6 and 2.1 fold in the BioE, respectively. However, the coulombic efficiency of this system was relatively low, ranging from 0.42% to 2.6%. This combination of results indicated that anode respiration was not the main process in the BioE. The increased CH 4 production and higher levels of methanogens obtained from the BioE confirmed that the methanogenic process proceeded, possibly facilitated by the diffusion of H 2 from the cathode to the anode. This study provides new insight into biocathode function for COD oxidation removal in BESs. Moreover, this study indicates that pursuing a high coulombic efficiency may not be necessary for wastewater treatment, as it consumes less energy at the lower value. Unlabelled Image • A membrane-less sleeve type BES (BioE) was designed for treatment of CGW • The removal of phenol/COD was enhanced while the CE was relatively low (0.42% ~2.6%) • Enhanced methanogenic process and higher biomass promoted the phenol/COD removal • H 2 produced from the cathode may accelerate phenol transformation and COD removal [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
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Abstract:A bioelectrochemical system (BES) is a technology with potential for accelerating the degradation of recalcitrant compounds, the components and configurations of which are important for treatment performance. In the present work, a membraneless sleeve-type BES (termed BioE) was designed for the treatment of synthetic coal gasification wastewater (CGW, phenol as a model pollutant) and real CGW. Compared with the biological control (termed Bio), the phenol removal rate and COD removal efficiency increased by 2.6 and 2.1 fold in the BioE, respectively. However, the coulombic efficiency of this system was relatively low, ranging from 0.42% to 2.6%. This combination of results indicated that anode respiration was not the main process in the BioE. The increased CH 4 production and higher levels of methanogens obtained from the BioE confirmed that the methanogenic process proceeded, possibly facilitated by the diffusion of H 2 from the cathode to the anode. This study provides new insight into biocathode function for COD oxidation removal in BESs. Moreover, this study indicates that pursuing a high coulombic efficiency may not be necessary for wastewater treatment, as it consumes less energy at the lower value. Unlabelled Image • A membrane-less sleeve type BES (BioE) was designed for treatment of CGW • The removal of phenol/COD was enhanced while the CE was relatively low (0.42% ~2.6%) • Enhanced methanogenic process and higher biomass promoted the phenol/COD removal • H 2 produced from the cathode may accelerate phenol transformation and COD removal [ABSTRACT FROM AUTHOR]
ISSN:15675394
DOI:10.1016/j.bioelechem.2019.05.013