Energy recovery evaluation in an up flow microbial electrolysis coupled anaerobic digestion (ME-AD) reactor: Role of electrode positions and hydraulic retention times

Sangeetha, T.; Guo, Zechong; Liu, Wenzong; Gao, Lei; Wang, Ling; Cui, Min-Hua; Chen, Chuan; Wang, Aijie

doi:10.1016/j.apenergy.2017.10.026

Cited by 59 publications

(12 citation statements)

References 54 publications

(76 reference statements)

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“…Moreover, anaerobic MFC had more biodegradable substrate than WAS MFC with better substrate removal efficiency of 2 times than that of the WAS MFC . The microbial consortia in anaerobic sludge usually consist of fermentative, acetogenic, and methanogenic archea that oxidize organic compounds in the absence of oxygen and possess exoelectrogenic characteristics . Compared to activated sludge, the carbon nitrogen ratio in anaerobic sludge was higher than aerobic sludge, and this might have facilitated the better fermentation and conversion of organics .…”

Section: Resultsmentioning

confidence: 99%

“…12 The microbial consortia in anaerobic sludge usually consist of fermentative, acetogenic, and methanogenic archea that oxidize organic compounds in the absence of oxygen and possess exoelectrogenic characteristics. 19 Compared to activated sludge, the carbon nitrogen ratio in anaerobic sludge was higher than aerobic sludge, and this might have facilitated the better fermentation and conversion of organics. 20 The overall results revealed the potential of using sludge in SMFC for effective wastewater treatment.…”

Section: Effects Of Sludge Nature On the Cod Removal Efficiencymentioning

confidence: 99%

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Sludge selection on the performance of sediment microbial fuel cells

et al. 2018

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Summary Sediment microbial fuel cells (SMFCs) are being constructed and operated to produce renewable power for remote monitoring. They are highly advantageous than typical MFCs. In this study, 2 kinds of sludge (activated sludge and anaerobic sludge) were used in SMFCs for investigating their performance characteristics such as the power density production and chemical oxygen demand (COD) removal. The performance of the SMFC with anaerobic sludge was found to be better than that of activated sludge. Experimental results revealed that the maximum power density and COD removal were reported in anaerobic sludge SMFC (10.36 mW/m2, 62%) and the activated sludge SMFC produced 3.97 mW/m2, with a COD removal of 58.2%. The dissolved oxygen values for activated and anaerobic sludge were 3.45 and 0.75 ppm respectively. Control SMFC was run without sediment, and its performance was inferior compared to the SCMFCs with sludge. Generally, the anaerobic SMFC had 2.52 times better power density production than the activated SMFC and control. Moreover, the COD removal was 19% higher than the control. Results concluded that the selection of sludge plays an important role in the SMFC performance. The findings of this study will be useful for the practical applications of SMFCs in real wastewater treatment plants and energy production in the future.

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Section: Resultsmentioning

confidence: 99%

Section: Effects Of Sludge Nature On the Cod Removal Efficiencymentioning

confidence: 99%

Sludge selection on the performance of sediment microbial fuel cells

et al. 2018

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“…The interest of implementing an MEC to produce methane as often been presented as a complement to anaerobic digestion (AD). It is generally claimed that MECs can operate with lower concentrations of substrate than AD so, for instance, effluents from a digester could be an appropriate inlet stream for an MEC [17,62,67,68]. Coupling MEC to AD has been shown to accelerate the degradation of some recalcitrant compounds and alter the AD microbial community thus increasing biogas production [16].…”

Section: Mec For Methanation and Microbial Electrosynthesismentioning

confidence: 99%

Microbial electrolysis cell (MEC): Strengths, weaknesses and research needs from electrochemical engineering standpoint

et al. 2020

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Microbial electrolysis cells (MECs) produce hydrogen at the cathode associated with the oxidation of organic matter at the anode. This technology can produce hydrogen by consuming less electrical energy than water electrolysis does. However, it has been very difficult so far to scale up efficient MECs beyond the size of small laboratory cells. This article firstly revisits the fundamentals of MECs to assert their theoretical advantages. The low formal equilibrium cell voltage of 0.123 V and electrical and thermal energy yields as high as 10 and 12, respectively, are major assets. Other theoretical strengths are discussed, including the possibility to produce methane, and some safety advantages. The experimental achievements at pilot scale (several litres volume) are analysed through the prism of electrochemical engineering. This analysis leads to recommendations to modify some research efforts, notably by giving priority to increasing current density rather than working with volumetric parameters, using Faradaic yields to detect dysfunctions, and systematizing control experiments at open circuit. The critical analysis successively addresses electrolytes, electrode kinetics, temperature, substrate concentration, reactor architecture, and control procedures. It brings to light intrinsic weaknesses of the MEC concept and identifies improvements that can be made using current technology, for instance, by the catalysis of hydrogen evolution at neutral pH. The problem of the low electrolyte conductivity is pointed out and, in return, how increasing it can be detrimental to the key issue of anode acidification. Finally, research lines are proposed with the objective of moving ahead towards MEC development.

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“…In addition to material modification, the positioning of electrodes could influence the performance of MECs. A study tested the impact of electrodes positioning in the top and bottom portions of the cells [36]. It was found MECs with electrodes arranged at the bottom had better performance with methane production of 304.5 mL/L/day compared to 154.6 mL/L/day for MECs with electrodes arranged at the top.…”

Section: Electrodesmentioning

confidence: 99%

Design Configurations and Operating Parameters of Bio-electrochemically Enhanced Anaerobic Digestion

Shabib¹,

Abdallah²,

Shanableh³

et al. 2021

IJESD

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Bio-electrochemical anaerobic digestion (AD) is one of the most recent advancement in anaerobic treatment processes. Microbial electrolysis cells (MECs) are used for bio-electrochemical treatment, where the supplied external power is used to enhance the performance of AD. Multiple studies have investigated the viability of MECs under various operating parameters and for different organic wastes. The present paper aims at reviewing the latest literature regarding bio-electrochemical enhanced AD through MECs. It was concluded that MEC reactors significantly enhance AD performance under different supplied voltages, temperatures, electrodes configuration, as well as other operating parameters. Based on the compiled literature, further comprehensive life cycle assessment of MECs is recommended prior to any full-scale implementation.

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Energy recovery evaluation in an up flow microbial electrolysis coupled anaerobic digestion (ME-AD) reactor: Role of electrode positions and hydraulic retention times

Cited by 59 publications

References 54 publications

Sludge selection on the performance of sediment microbial fuel cells

Sludge selection on the performance of sediment microbial fuel cells

Microbial electrolysis cell (MEC): Strengths, weaknesses and research needs from electrochemical engineering standpoint

Design Configurations and Operating Parameters of Bio-electrochemically Enhanced Anaerobic Digestion

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