Electrolysis-enhanced anaerobic digestion of wastewater

Tartakovsky, B.; Mehta, P.; Bourque, J.-S.; Guiot, Serge R.

doi:10.1016/j.biortech.2011.02.097

Cited by 122 publications

(63 citation statements)

References 32 publications

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“…Tartakovsky et al (2011) observed improved AD performance based on applied potentials of 2.8-3.5 V with dimensionally stable electrodes in a UASB reactor. The improvement was attributed to enhanced hydrolysis due to micro-aerobic conditions at the anode and additional H 2 input for methanogenesis and improved biogas quality at the cathode.…”

Section: Discussionmentioning

confidence: 86%

“…Several studies already highlighted that combining anaerobic digesters with a BES resulted in a higher level of biogas production , Sasaki et al 2011a, Sasaki et al 2010b, Tartakovsky et al 2011, Vijayaraghavan and Sagar 2010, Weld and Singh 2011. Different AD-BES configurations, such as the utilization of a BES as preor post-treatment device outside the AD reactor or the direct application of a BES in the digester, may lead to enhanced methane production.…”

Section: Introductionmentioning

confidence: 99%

“…The direct application of the cathode in an AD reactor resulted in enhanced COD removal and methane production during anaerobic digestion of filter paper and garbage slurry, respectively (Sasaki et al 2011a, Sasaki et al 2010b). The introduction of both the anode and cathode of a BES in the sludge bed of an UASB (Tartakovsky et al 2011) or in a CSTR (Vijayaraghavan and Sagar 2010) also resulted in increased methane production. A BES can also be used for post-digestion polishing of highly loaded wastewaters, leading to side products such as H 2 .…”

Section: Introductionmentioning

confidence: 99%

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Biomass retention on electrodes rather than electrical current enhances stability in anaerobic digestion

et al. 2014

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Anaerobic digestion (AD) is a well-established technology for energy recovery from organic waste streams. Several studies noted that inserting a bioelectrochemical system (BES) inside an anaerobic digester can increase biogas output, however the mechanism behind this was not explored and primary controls were not executed. Here, we evaluated whether a BES could stabilize AD of molasses. Lab-scale digesters were operated in the presence or absence of electrodes, in open (no applied potential) and closed circuit conditions. In the control reactors without electrodes methane production decreased to 50% of the initial rate, while it remained stable in the reactors with electrodes, indicating a stabilizing effect. After 91 days of operation, the now colonized electrodes were introduced in the failing AD reactors to evaluate their remediating capacity. This resulted in an immediate increase in CH 4 production and VFA removal. Although a current was generated in the BES operated in closed circuit, no direct effect of applied potential nor current was observed. A high abundance of Methanosaeta was detected on the electrodes, however irrespective of the applied cell potential. This study demonstrated that, in addition to other studies reporting only an increase in methane production, a BES can also remediate AD systems that exhibited process failure. However, the lack of difference between current driven and open circuit systems indicates that the key impact is through biomass retention, rather than electrochemical interaction with the electrodes.

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Section: Discussionmentioning

confidence: 86%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Biomass retention on electrodes rather than electrical current enhances stability in anaerobic digestion

et al. 2014

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“…Lower H 2 S values in the MEC-septic tank were measured between day 25 to day 60 of phase 1 and during phase 2, they became below detection limits (<2 ppmv). The H 2 S concentrations in the control reactor were as high as 700 ppmv (day [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] and on average about 200 ppmv (day 20-98). …”

Section: Biogas Compositionmentioning

confidence: 99%

“…Electrochemical assisted anaerobic digestion has been introduced as a new alternative to improve the anaerobic digestion process [9][10][11]. The implementation of a microbial electrolysis cell (MEC) coupled with a digester can allow in situ production of H 2 and O 2 by applying an electric field.…”

Section: Introductionmentioning

confidence: 99%

Performance of a lab-scale bio-electrochemical assisted septic tank for the anaerobic treatment of black water

Zamalloa¹,

Arends²,

Boon³

et al. 2013

New Biotechnology

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Performance of a lab-scale bio-electrochemical assisted septic tank for the anaerobic treatment of black water. New Biotechnology 30 (5) 573-580 doi:10.1016/j.nbt.2013.01.009 Title: Performance of a lab-scale bio-electrochemical assisted septic tank for the anaerobic treatment of black water. AbstractSeptic tanks are used for the removal of organic particulates in wastewaters by physical accumulation instead of through the biological production of biogas. Improved biogas production in septic tanks is crucial to increase the potential of this system for both energy generation and organic matter removal. In this study, the effect on the biogas production and biogas quality of coupling a 20 L lab-scale septic tank with a microbial electrolysis cell (MEC) was investigated and compared with a standard septic tank. Both reactors were operated at a volumetric organic loading rate of 0.5 gCOD/L d and a hydraulic retention time between 20 and 40 days using black water as an input under mesophilic conditions for a period of 3 months. The MEC-septic tank was operated at an applied voltage of 2.0 ±0.1V and the current experienced ranged from 40 mA (0.9 A/m 2 projected electrode area) to 180 mA (5 A/m 2 projected electrode area). The COD removal was of the order of 85% and the concentration of residual COD was not different between both reactors. Yet, the total phosphorous in the output was on average 39% lower in the MEC-septic tank. Moreover, the biogas production rate in the MEC-septic tank was a factor of 5 higher than in the control reactor and the H 2 S concentration in the biogas was a factor of 2.5 lower. The extra electricity supplied to the MECseptic tank was recovered as extra biogas produced. Overall, it appears that the combination of MEC and a septic tank offers perspectives in terms of lower discharge of phosphorus and H 2 S, nutrient recuperation and a more reliable supply of biogas.

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A Promising Strategy for Renewable Energy Recovery

Zhao

Zhang

2020

Bioelectrosynthesis

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Electrolysis-enhanced anaerobic digestion of wastewater

Cited by 122 publications

References 32 publications

Biomass retention on electrodes rather than electrical current enhances stability in anaerobic digestion

Biomass retention on electrodes rather than electrical current enhances stability in anaerobic digestion

Performance of a lab-scale bio-electrochemical assisted septic tank for the anaerobic treatment of black water

A Promising Strategy for Renewable Energy Recovery

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