Integration of hydrogen production and waste heat recovery in electrochemical wastewater treatment

Jiang, Juyuan; Hu, Jianli; Cui, Mingxian; He, Tianbiao

doi:10.1016/j.renene.2011.12.007

Cited by 24 publications

(12 citation statements)

References 4 publications

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“…The feasibility of using WEC systems for H 2 production during wastewater treatment has been assessed for synthetic [12,[14][15][16][17][18][19] and real domestic and industrial wastewaters [8,9,[20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Molecular hydrogen production from wastewater electrolysis cell with multi-junction BiOx/TiO2 anode and stainless steel cathode: Current and energy efficiency

Cho

Hoffmann

2017

Applied Catalysis B: Environmental

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Electrochemical hydrogen evolution reaction (HER) has been recognized as a viable approach to generate a clean energy fuel. However, substantial technical breakthroughs are needed to reduce the costs for electricity and chemical reagents. In this study, we explore a specific wastewater electrolysis cell (WEC) as an alternative of decentralized H 2 production coupled with onsite water treatment. A prototypical WEC consists of a multi-junction semiconductor anode and a stainless steel cathode paired in single compartment cell. A distinct layer of BiO x /TiO 2 on anode surface had relatively low crystallinity that was shown to be beneficial for higher oxide formation and O 2 evolution. The over-potential and Tafel slope of the BiO x /TiO 2 anode were determined to be 0.32 V and 120 mV decade-1. In a single compartment WEC with a NaCl electrolyte ([Cl-] ≤ 50 mM), the current density (j) ranged up to 500 A m-2 at cell voltages less than 6 V, while the current efficiency (CE) for free chlorine (FC) evolution showed maximum value near 0.3. The CE and energy efficiency (EE) for the HER were assessed using NaCl solutions (50 mM with or without 2.5 g L-1 urea) and real wastewater with variable compositions ([Cl-]: 6 ~ 33 mM, [chemical oxygen demand]: 60 ~ 790 mg L-1). The ohmic resistance of wastewater electrolyte rules out the usage of membrane separation, resulting in side reactions such as reduction of O 2 whose CE values monotonically decreased with an increasing j under the diffusion controlled regime. Chloride ions reduce the electron consumption during O 2 reduction, while elevated levels of FC significantly lower the CE for the HER. The combined presence of oxidizable organic compounds and Clenhance the CE for the HER as long as the concentration of organics is enough to quench FC to maintain a pseudo steady-state concentration. The highest CE (0.8) and EE (0.23) for HER were observed during electrolysis of real wastewater at j values exceeding 200 A m-2. However, a dependency of value of EE on the applied cell voltage needs to be addressed further.

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Section: Introductionmentioning

confidence: 99%

Molecular hydrogen production from wastewater electrolysis cell with multi-junction BiOx/TiO2 anode and stainless steel cathode: Current and energy efficiency

Cho

Hoffmann

2017

Applied Catalysis B: Environmental

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“…Furthermore, relevant recovery possibilities should be considered, such as chemicals, electric power and heat. The larger the electrochemical cell and the higher the current densities applied, the greater the heat recovery that can be achieved (Jiang et al, 2012). Finally, a significant boost to electrochemical applications is expected to be given by a future shift towards decentralized treatment, due to their ease for remote control but also their potential independency from the power grid (Radjenovic & Sedlak, 2015), as well as by the availability of cheap and renewable electricity.…”

Section: Discussionmentioning

confidence: 99%

“…The ion-exchange membrane allows for selective passage of negatively (anion-exchange membrane) or positively (cation-exchange membrane) charged ions. Using a membrane results in the formation of two electrolyte chambers (Jiang et al, 2012). This separation provides specific advantages, such as product recovery in the separate electrolyte chambers, pH gradient, and separation of toxic products in the case of bioelectrochemical systems.…”

Section: The Electrochemical Cellmentioning

confidence: 99%

Electrochemical removal of sulfur pollution

Ntagia¹,

Prévoteau²,

Rabaey³

2020

Environmental Technologies to Treat Sulphur Pollution: Principles and Engineering

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Sulfur compounds are common contaminants in gaseous and aqueous waste streams such as sour gases, sewage and industrial wastewaters. The broad range of sulfur compounds contained in the wastewater, as well as the total sulfur concentration, the pH range and the presence of additional contaminants, e.g. organic compounds or trace metals, will define the selection of the treatment strategies. Sulfur pollution treatment today comprises a wide range of biological (

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“…To most effectively counteract the impact of the emissions and the energy import balances associated with transportation fuels, hydrogen must be produced from domestically available renewable resources such as wind, solar, and biomass [3]. Among the methods of hydrogen production from renew-able resources, a variety of technologies for biohydrogen production has been developed and attracted an increasing interest in the world [4][5][6][7][8][9][10][11][12][13][14]. Recently, fermentative hydrogen production from high concentrated organic wastewater has been studied extensively and developed rapidly, which can solve the water pollution problems as well as generate hydrogen [3,[15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Effect of Initial Sludge Loading Rate on the Formation of Ethanol Type Fermentation for Hydrogen Production in a Continuous Stirred‐Tank Reactor

Ren

2012

Env Prog and Sustain Energy

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Ethanol type fermentation has attracted an increasing interest because of its high hydrogen yield. A continuous stirred-tank reactor (CSTR) was introduced and the effect of sludge loading rate (SLR) on formation of ethanol type fermentation for hydrogen production was investigated in this research. It was found that the initial SLR influenced the formation process of ethanol type fermentation remarkably. When the CSTR was started up with an initial SLR of 0.63 kg chemical oxygen demand (COD)/kg mixed liquor volatile suspend solid (MLVSS)/d (COD: COD, MLVSS: mixed liquor volatile suspended solids), ethanol type fermentation was recognized within 16 days that was 7 and 14 days prior than the earlier SLR of 0.75 and 1.47 kg COD/kg MLVSS/d, respectively. However, the highest hydrogen-producing rate of the activated sludge came up to 0.102 m 3 /kg MLVSS/d when initial SLR of 1.47 kg COD/kg MLVSS/d. A succession of acidogenic fermentation types had occurred during the formation process of ethanol type fermentation, they were mixed acid fermentation, propionic acid type fermentation, butyric acid type fermentation and ethanol type fermentation in a sequence. Moreover, it was also found that ethanol type fermentation could occur within a pH range of 4.0-5.3, much wider than that have been reported previously.

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Integration of hydrogen production and waste heat recovery in electrochemical wastewater treatment

Cited by 24 publications

References 4 publications

Molecular hydrogen production from wastewater electrolysis cell with multi-junction BiOx/TiO2 anode and stainless steel cathode: Current and energy efficiency

Molecular hydrogen production from wastewater electrolysis cell with multi-junction BiOx/TiO2 anode and stainless steel cathode: Current and energy efficiency

Electrochemical removal of sulfur pollution

Effect of Initial Sludge Loading Rate on the Formation of Ethanol Type Fermentation for Hydrogen Production in a Continuous Stirred‐Tank Reactor

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