Impact of applied voltage on methane generation and microbial activities in an anaerobic microbial electrolysis cell (MEC)

Ding, Aqiang; Yu, Yang; Sun, Guang–Zhen; Wu, Donglei

doi:10.1016/j.cej.2015.07.054

Cited by 248 publications

(58 citation statements)

References 26 publications

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“…Subsequently, the removal efficiency dropped when the applied voltage rose above 0.8 V. Increasing of the removal efficiency by 30%, was achieved when the applied voltage was raised from 0.4 V to 0.8 V. As well, increasing the applied voltage above 0.8 V had a negative effect on COD removal, where high voltage could prevent bacterial activity. Thereby, low COD removal was recorded (Ding et al, 2016). Identical results, with high COD removal efficiency, were previously reported in two chamber MEC (Ding et al, 2016).…”

Section: Cod Removal Efficiencysupporting

confidence: 58%

“…Thereby, low COD removal was recorded (Ding et al, 2016). Identical results, with high COD removal efficiency, were previously reported in two chamber MEC (Ding et al, 2016). It was shown that the applied voltage had a big influence on COD removal and that applying the optimal value can enhance COD removal and lower the operational cost.…”

Section: Cod Removal Efficiencysupporting

confidence: 49%

“…Depending on this supposition, the cathode chamber in the MEC reactor could be used to deposit P as struvite. Technology of MECs have been used for production and generation different useful products such as bio-hydrogen production , biomethane production (Ding et al, 2016), ammonium recovery (Kuntke et al, 2014) and P recovery (Cusick and Logan, 2012;Cusick et al, 2014). The recovery of P in MEC has not been studied in enough depth, just few researches have focused on the subject to date.…”

Section: Research Articlementioning

confidence: 99%

See 2 more Smart Citations

Technology of Microbial Electrolysis Cell with Statistical Optimization by Response Surface Methodology for Bio-Hydrogen Production and Phosphorus Recovery

Alshehri

2018

Int J Appl Sci Biotechnol

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In this study, two chamber microbial electrolysis cells (MECs) were used to investigate effect of applied voltage and concentration of influent COD on bio-hydrogen (H2) production and phosphorus (P) recovery. On the cathode chamber P as crystals were precipitated (the maximum was 94%), and verified as struvite, using X-ray diffraction and scanning electron microscopy analysis. Maximum of the H2 production rate was 0.31m 3 /m 3 /d. H2 production and P recovery have highly affected by applied voltage according to statistical optimization, while P recovery only had significantly affected by influent COD concentration. The range from 28 to 42%, was the total of energy recovery in the MEC. The current findings demonstrated capability of H2 production and P recovery using MECs technology.

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Section: Cod Removal Efficiencysupporting

confidence: 58%

Section: Cod Removal Efficiencysupporting

confidence: 49%

Section: Research Articlementioning

confidence: 99%

See 1 more Smart Citation

Technology of Microbial Electrolysis Cell with Statistical Optimization by Response Surface Methodology for Bio-Hydrogen Production and Phosphorus Recovery

Alshehri

2018

Int J Appl Sci Biotechnol

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“…This phenomenon was observed not only in synthetic wastewater but also in animal and winery wastewater experiments . For this reason, some researchers intended to develop MECs that aimed at maximizing methane production . However, methane, though useful, cannot compete with hydrogen in terms of energy content and applicability.…”

Section: Figurementioning

confidence: 99%

Persistent Hydrogen Production by the Photo‐Assisted Microbial Electrolysis Cell Using a p‐Type Polyaniline Nanofiber Cathode

Jeon

Kim

2016

ChemSusChem

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A microbial electrolysis cell, though considered as a promising, environmentally friendly technology for hydrogen production, suffers from concomitant production of methane. The high hydrogen/methane ratio at the initial operation stage decreases with time. Here we report for the first time the photoassisted microbial electrolysis cell (MEC) for persistent hydrogen production using polyaniline nanofibers as a cathode. Under 0.8 V external bias and laboratory fluorescent light illumination in a single-chamber MEC, continuous hydrogen production from acetate at a rate of 1.78 mH2 m d with 79.2 % overall hydrogen recovery was achieved with negligible methane formation for six months. Energy efficiencies based on input electricity as well as input electricity plus substrate were 182 and 66.2 %, respectively. This was attributed to the p-type-semiconductor characteristics of polyaniline nanofibers in which photoexcited electrons are used to reduce protons at the surface and holes are reduced with electrons originating from acetate oxidation at the anode. This method can be extended to microbial wastewater treatment for hydrogen production.

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“…MECs have been used for different applications such as hydrogen production , methane production (Ding et al, 2016), ammonium recovery (Kuntke et al, 2014) and P recovery (Cusick & Logan, 2012;Cusick et al, 2014). The recovery of P in MEC has not been studied in depth; few studies have focused on the topic to date.…”

mentioning

confidence: 99%

Concurrent hydrogen production and phosphorus recovery in dual chamber microbial electrolysis cell

Almatouq

Babatunde

2017

Bioresource Technology

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Concurrent hydrogen (H 2 ) production and phosphorus (P) recovery were investigated in dual chamber microbial electrolysis cells (MECs). The aim of the study was to explore and understand the influence of applied voltage and influent COD concentration on concurrent H 2 production and P recovery in MEC. P was efficiently precipitated at the cathode chamber and the precipitated crystals were verified as struvite, using X-ray diffraction and scanning electron microscopy analysis. The maximum P precipitation efficiency achieved by the MEC was 95%, and the maximum H 2 production rate was 0.28 m 3 -H 2 /m 3 -d. Response surface methodology showed that applied voltage had a great influence on H 2 production and P recovery, while influent COD concentration had a significant effect on P recovery only. The overall energy recovery in the MEC was low and ranged from 25 ± 1 to 37 ± 1.7 %. These results confirmed MECs capability for concurrent H 2 production and P recovery.Keywords: Bio-electrochemical System; Phosphorus Recovery; Microbial Electrolysis Cell; Struvite; Response Surface Methodology IntroductionDue to population growth, the global demand for unsustainable resources is rising. As a result, concerns around resource depletion are increasing. Phosphorus is one of the most 2 important unsustainable nutrients on our planet. Phosphorus is essential for all forms of life, especially for plant growth. Unfortunately, estimates show that phosphorus rocks will be depleted within the next 50-100 years (Cooper et al., 2011). Therefore, alternative sources of phosphorus should be discovered to balance the high demand for phosphorus. Magnesium ammonium phosphate (struvite) is one of most common phosphate fertilizers that can be recovered from different streams of wastewater. Struvite is an efficient slow release fertilizer that can be used for crop growth, and is an excellent alternative for phosphate rocks (Rahman et al., 2014).Struvite precipitation occurs in the equimolecular concentration of magnesium (Mg), ammonium (NH 4 ) and (P); these elements combine with water to form struvite. The precipitation of these components is also highly dependent on pH, where struvite starts to precipitate at pH > 8 (Doyle & Parsons, 2002). The most common methods for P recovery as struvite are chemical addition and carbon dioxide stripping through aeration. These processes are effective for struvite precipitation; however, the operation cost is too high. Using chemical addition to raise the solution's pH can account for up to 97% of struvite cost (Jaffer et al., 2002;Morales et al., 2013).Microbial electrolysis cells (MECs) are a new and promising approach for hydrogen (H 2 ) production from organic matter, including wastewater and other renewable resources. In MECs, electrochemically active bacteria oxidise organic matter and generate CO 2 , electrons and protons. The bacteria transfer the electrons to the anode and the protons are released into the solution. The electrons then travel through a wire to a cathode and combine wit...

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Impact of applied voltage on methane generation and microbial activities in an anaerobic microbial electrolysis cell (MEC)

Cited by 248 publications

References 26 publications

Technology of Microbial Electrolysis Cell with Statistical Optimization by Response Surface Methodology for Bio-Hydrogen Production and Phosphorus Recovery

Technology of Microbial Electrolysis Cell with Statistical Optimization by Response Surface Methodology for Bio-Hydrogen Production and Phosphorus Recovery

Persistent Hydrogen Production by the Photo‐Assisted Microbial Electrolysis Cell Using a p‐Type Polyaniline Nanofiber Cathode

Concurrent hydrogen production and phosphorus recovery in dual chamber microbial electrolysis cell

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