Concurrent Phosphorus Recovery and Energy Generation in Mediator-Less Dual Chamber Microbial Fuel Cells: Mechanisms and Influencing Factors

Almatouq, Abdullah; Babatunde, Akintunde

doi:10.3390/ijerph13040375

Cited by 44 publications

(16 citation statements)

References 18 publications

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“…No deterioration in 15 current (in OCV) was noticed, which confirms the effect of P recovery on the current. Similar findings were observed in previous studies (Almatouq & Babatunde, 2016;Cusick et al, 2014). After each cycle, the cathode electrode was replaced with a new electrode and the used electrode was removed for maintenance.…”

Section: Cathode and Membrane Scalingsupporting

confidence: 77%

“…Therefore, most of COD was consumed by methanogens in long cycle duration and that led to decrease CE. In addition, current deterioration due struvite precipitation on the cathode surface decreased CE as well (Almatouq & Babatunde, 2016). …”

Section: Cathode and Membrane Scalingmentioning

confidence: 99%

“…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 with the free protons in the solution to produce hydrogen gas (Equations [1] and [2]) .Anode chamber: CH 3 COO-+ 4 H 2 O → 2 HCO 3-+ 9 H + + 8 e -Cathode chamber: 8 H + + 8 e -→ 4 H 2 (2) 3 The consumption of protons at the cathode chamber increases solution pH (Moussa et al, 2006). Based on this hypothesis, the cathode chamber in the MEC can be used to precipitate P as struvite.…”

mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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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Section: Cathode and Membrane Scalingsupporting

confidence: 77%

Section: Cathode and Membrane Scalingmentioning

confidence: 99%

mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Almatouq

Babatunde

2017

Bioresource Technology

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“…Thus, most of COD was utilized by methanogens in long batch duration and that caused of decrease the CE. As well, the current was deteriorated and the CE was further decreased because struvite precipitation on the surface of cathode electrode (Almatouq and Babatunde, 2016).…”

Section: Cod Removal Efficiencymentioning

confidence: 99%

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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A Critical Review on Prospects and Challenges in “Conceptualization to Technology Transfer” for Nutrient Recovery from Municipal Wastewater

Lanjewar¹,

Mishra²,

Mukherjee³

et al. 2022

Sustainable Water Treatment

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Concurrent Phosphorus Recovery and Energy Generation in Mediator-Less Dual Chamber Microbial Fuel Cells: Mechanisms and Influencing Factors

Cited by 44 publications

References 18 publications

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

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

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

A Critical Review on Prospects and Challenges in “Conceptualization to Technology Transfer” for Nutrient Recovery from Municipal Wastewater

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