A metallurgical microbial fuel cell (MFC) is an attractive alternative for recovery of copper from containing waste streams, as the metal recovered in its metallic form at cathode, while energy reduction can be obtained oxidation organic materials anode with possible additional production electricity. We studied MFC using a bipolar membrane pH separator. Under anaerobic conditions, maximum power density was 0.43 W/m2 current 1.7 A/m2. In presence oxygen, performance improved considerably to...

Abstract Anaerobic methanotrophic (ANME) archaea are environmentally important, uncultivated microorganisms that oxidize the potent greenhouse gas methane. During methane oxidation, ANME engage in extracellular electron transfer (EET) with other microbes, metal oxides, and electrodes through unclear mechanisms. Here, we cultivate ANME-2d ( ‘Ca . Methanoperedens’) bioelectrochemical systems observe strong methane-dependent current (91–93% of total current) associated high enrichment ‘ Ca...

There is a need for alternative catalysts oxygen reduction in the cathodic compartment of microbial fuel cell (MFC). In this study, we show that bipolar membrane combined with ferric iron on graphite electrode an efficient cathode system MFCs. A flat plate MFC felt electrodes, volume 1.2 L and projected surface area 290 cm2 was operated continuous mode. Ferric reduced to ferrous according Fe3+ + e- → Fe2+ (E0 = +0.77 V vs NHE, normal hydrogen electrode). This reversible electron transfer...

A methane-producing microbial electrolysis cell (MEC) is a technology to convert CO2 into methane, using electricity as an energy source and microorganisms the catalyst. MEC provides possibility increase fuel yield per hectare of land area, when produced in biofuel production processes converted additional methane. Besides increasing this also results more efficient use water, nutrients. In research, performance was studied for 188 days flat-plate design. Methane rate efficiency were...

Scaling up microbial fuel cells (MFCs) is inevitable when power outputs have to be obtained that can electrical devices other than small sensors. This research has used a bipolar plate MFC stack of four with total working volume 20 L and membrane surface area 2 m2. The cathode limited performance due oxygen reduction rate cell reversal. Furthermore, residence time distribution curves showed bending membranes resulted in flow paths through which the catholyte could from inlet outlet, while...

The use of mixed cultures to convert waste biomass into medium chain fatty acids, precursors for renewable fuels or chemicals, is a promising route. To an external electron donor in the form hydrogen ethanol needs be added. This study investigated whether cathode bioelectrochemical system can used as conversion acetate acids. We show that acids were produced at −0.9 V vs NHE potential, without addition mediator. Caproate, butyrate, and smaller fractions caprylate main products formed from...

The oxygen reduction rate at the cathode is a limiting factor in microbial fuel cell (MFC) performance. In our previous study, we showed performance of an MFC with ferric iron (Fe3+) cathode. Instead oxygen, was reduced to ferrous (Fe2+) bipolar membrane between anode and compartment. This resulted higher potential than usually obtained on metal-based chemical catalysts MFCs. this investigated operation same simultaneous biological oxidation catholyte. We show that immobilized microorganism...

Removal of nitrogen compounds from wastewater is essential to prevent pollution receiving water bodies. Bioelectrochemical systems enable energy-efficient removal and even recovery ammonia wastewaters.

A two-step treatment system for nutrient and energy recovery from urine was successfully operated six months. In the first step, phosphorus (P) recovered as struvite (magnesium ammonium phosphate or MAP) in a MAP reactor. The effluent of this reactor used total ammonia-nitrogen (TAN) hydrogen production Microbial Electrolysis Cell (MEC). This MEC coupled to Transmembranechemisorption (TMCS) module, which TAN an sulphate solution. had projected surface area 0.5 m2 at different dilutions....

The main limiting factor in Microbial Fuel Cell (MFC) power output is the cathode, because of high overpotential for oxygen reduction. Oxygen reducing biocathodes can decrease this by use microorganisms as a catalyst. In study, we investigated factors biocathode performance. Three were started up at different cathode potentials, and their performance catalytic behavior was tested means polarization curves cyclic voltammetry. controlled +0.05 V +0.15 vs Ag/AgCl produced current almost...

Raw metals are fundamental to the global economy as they essential maintain quality of our life well industrial performance. A number metal-bearing aqueous matrices appealing alternative supplies conventional mining, like solid and urban waste leachates, wastewaters even some natural extreme environments (e.g. deep marine sediments, geothermal brines). Some these sources already managed for recovery, while others not suitable either because too low in content recoverable or contain many...

A methane-producing biocathode that converts CO(2) into methane was studied electrochemically and microbiologically. The produced at a maximum rate of 5.1 L CH(4)/m(2) projected cathode per day (1.6 A/m(2)) -0.7 V versus NHE potential 3.0 (0.9 -0.6 potential. microbial community the dominated by three phylotypes Archaea six bacteria. Archaeal were most closely related to Methanobacterium palustre aarhusense. Besides methanogenic Archaea, bacteria seemed be associated with production,...

In this study, we identified mass and charge transfer resistances for an oxygen reducing biocathode in a microbial fuel cell (MFC) by electrochemical impedance spectroscopy (EIS). The was grown using nitrifying sludge as the inoculum. A standard model at electrode surface combined with diffusion across boundary layer used. EIS measurements were performed under variation of both linear flow velocities cathode potentials. Fitting data to constant potential different rates confirmed that...

Abstract BACKGROUND In a methane‐producing bioelectrochemical system ( BES ) microorganisms grow on an electrode and catalyse the conversion of CO 2 electricity into methane. Theoretically, methane can be produced bioelectrochemically from via direct electron transfer or indirectly hydrogen, acetate formate. Understanding mechanisms could give insight methods to steer process towards higher rate. RESULTS this study, production by mixed cultures were investigated. At cathode potential −0.7 V...

Complete removal and recovery of total ammonia nitrogen (TAN) from wastewaters in (bio)electrochemical systems has proven to be a challenge. The system performance depends on several factors, such as current density, TAN loading rate pH. interdependence among these factors is not well understood yet: insight needed achieve maximum ammonium at minimal energy input. aim this study was investigate the influence density efficiency input an electrochemical cell (EC). We therefore defined load...

Recycling of hydrogen gas (H2) produced at the cathode to anode in an electrochemical system allows for energy efficient TAN (Total Ammonia Nitrogen) recovery. Using a H2 recycling (HRES) we achieved high transport rates low input. At current density 20 A m-2, removal rate from influent was 151 gN m-2 d-1 demand 26.1 kJ gN-1. The maximum 335 50 and 56.3 High efficiency (73-82%) recovery (60-73%) were reached all experiments. Therefore, our HRES is promising alternative bioelectrochemical...

In the biotechnological desulfurization process under haloalkaline conditions, dihydrogen sulfide (H2S) is removed from sour gas and oxidized to elemental sulfur (S8) by sulfide-oxidizing bacteria. Besides S8, byproducts sulfate (SO42-) thiosulfate (S2O32-) are formed, which consume caustic form a waste stream. The aim of this study was increase selectivity toward S8 new line-up for biological desulfurization, applying two bioreactors with different substrate conditions (i.e., sulfidic...