Implication of diffusion and significance of anodic pH in nitrogen-recovering microbial electrochemical cells

Haddadi, Shokouh Hosseinzadeh; Elbeshbishy, Elsayed; Lee, Hyung-Sool

doi:10.1016/j.biortech.2013.05.075

Cited by 47 publications

(21 citation statements)

References 23 publications

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“…Then they proved that a nonnoble cathode has a similar performance to Pt-based cathode. Haddadi et al [118] have shown that the addition of urea to MFCs can help maintain a neutral pH, because urea hydrolysis liberates ammonia, which counteracts the acidification process. The experiments were conducted in microbial electrochemical cells with cation and anion exchange membranes in batch mode and were intended for ammonium recovery (61 %).…”

Section: Bio-electro-oxidation Of Ureamentioning

confidence: 99%

Urea removal from aqueous solutions—a review

2016

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The abundance of urea in the natural environment is dictated by the fact that it is one of the major products of mammalian protein metabolism. Due to the extensive use of urea in many branches of industry, it is produced in large quantities. Urea enters into the environment not only with wastewater from the production plants but also by leaching from the fields, agro-breeding farms, and the effluents from the plants using it as a raw material. There are many methods of urea removal, but most of them are still being developed or are very new. The methods themselves differ in terms of physicochemical nature and technological ingenuity. Many wastewater treatment methods include processes such as hydrolysis, enzymatic hydrolysis, decomposition in the biological bed, decomposition by strong oxidants, adsorption, catalytic decomposition, and electrochemical oxidation. In this work, methods of urea removal from aqueous solutions have been reviewed. Particular attention was paid to electrochemical methods.

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Section: Bio-electro-oxidation Of Ureamentioning

confidence: 99%

Urea removal from aqueous solutions—a review

2016

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“…As a result of cathode reduction reaction, the pH of the catholyte could increase to above 11-12, which will facilitate conversion of 89 ammonium to ammonia for subsequent recovery by stripping. Ammonia recovery by MFCs has been successfully demonstrated in laboratory studies (Kuntke et al 2011), and higher current generation would greatly enhance the ammonia recovery (Haddadi et al 2013, Kuntke et al 2014). …”

Section: Introductionmentioning

confidence: 99%

“…When cation exchange membranes (CEMs) are used (Cheng et al 2013, Haddadi et al 2013, Logan et al 2008b, Rozendal et al 2006a), the current is carried by cations such as NH4 + ions moving from the anolyte into the catholyte through the CEM. The NH4 + ions, once transported into the catholyte, are converted into NH3 molecules because the catholyte is usually rendered basic by the production of OH − ions therein (Haddadi et al 2014, Kim et al 2008, Kuntke et al 2012).…”

Section: Introductionmentioning

confidence: 99%

“…Some studies indicate that NH4 + transport dominates the current across the (Haddadi et al 2013). However, this conclusion was based on the assumption that the diffusion of NH4 + ions under these conditions is the same, whose validity/generality is not yet clear.…”

Section: Introductionmentioning

confidence: 99%

“…This type of process has been demonstrated in various BES including microbial fuel cells (MFCs) and microbial electrolysis cells (MECs). In MECs, a higher current density would greatly enhance ammonia recovery (Haddadi et al 2013), and thus MECs with external power exhibit a better performance for ammonium recovery than MFCs (Zhang et al 2014a). It was reported that ammonia can be recovered from ammonium-rich wastewater, such as 6 synthetic wastewater, urine, and swine wastewater (Kim et al 2008, Kuntke et al 2011, Kuntke et al 2012, Qin and He 2014).…”

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confidence: 99%

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Resource recovery by osmotic bioelectrochemical systems towards sustainable wastewater treatment

Qin

2017

Environ. Sci.: Water Res. Technol.

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(academic)Recovering valuable resources from wastewater will transform wastewater management from a treatment focused to sustainability focused strategy, and creates the need for new technology development. An innovative treatment concept -osmotic bioelectrochemical system (OsBES), which is based on cooperation between bioelectrochemical systems (BES) and forward osmosis (FO), has been introduced and studied in the past few years. An OsBES can accomplish simultaneous treatment of wastewater and recovery of resources such as nutrient, energy, and water (NEW). The cooperation can be accomplished in either an integrated (osmotic microbial fuel cells, OsMFC) or coupled (microbial electrolysis cell-forward osmosis system, MEC-FO) configuration.In OsMFC, higher current generation than regular microbial fuel cell (MFC) was observed, resulting from the lower resistance of FO membrane. The electricity generation in OsMFC could greatly inhibit the reverse salt flux. Besides, ammonium removal was successfully demonstrated in OsMFC, making OsMFCs a promising technology for "NEW recovery" (NEW: nutrient, energy and water). For the coupled OsBES, an MEC-FO system was developed. The MEC produced an ammonium bicarbonate draw solute via recovering ammonia from synthetic organic solution, which was then applied in the FO for extracting water from the MEC anode effluent. The system has been advanced with treating landfill leachate. A mathematical model developed for ammonia removal/recovery in BES quantitatively confirmed that the NH4 + ions serve as effective proton shuttles across cation exchange membrane (CEM). Resource Recovery by Osmotic Bioelectrochemical Systems towards Sustainable Wastewater TreatmentMohan Qin Abstract (general audience)Nowadays, wastewater is no longer considered as waste. Instead, it is a pool for different kinds of resources, such as nutrient, energy, and water (NEW). Various technologies were developed to achieve NEW recovery from wastewater. A novel concept, osmotic bioelectrochemical system (OsBES) has been introduced and studied in the past few years. OsBES is based on two technologies: bioelectrochemical systems (BES) and forward osmosis (FO); and the corporation between these two technologies could accomplish simultaneous wastewater treatment and resource recovery. We investigated two kinds of OsBES: one is osmotic microbial fuel cells (OsMFC), and the other is microbial electrolysis cell-forward osmosis system (MEC-FO). For OsMFC, a mathematical model was built to understand the internal resistance, which will affect the current generation according to Om's law (I=U/R). The salt transport across the cation exchange membrane (CEM) is related to the current generation. The ion transport, especially ammonium/ammonia transport, across CEM membrane in BES was modelled, which will help the BES design and operation for ammonia recovery systems. The system performance for wastewater treatment and resource recovery in MEC-FO was fully investigated with both synthetic wastewater and landfill leach...

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Bioelectrochemical System in Wastewater Treatment: Resource Recovery from Municipal and Industrial Wastewaters

Guo

Ngo

2021

Sustainable Resource Management, Volume I

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Implication of diffusion and significance of anodic pH in nitrogen-recovering microbial electrochemical cells

Cited by 47 publications

References 23 publications

Urea removal from aqueous solutions—a review

Urea removal from aqueous solutions—a review

Resource recovery by osmotic bioelectrochemical systems towards sustainable wastewater treatment

Bioelectrochemical System in Wastewater Treatment: Resource Recovery from Municipal and Industrial Wastewaters

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