The use of electrochemically active bacteria to break down organic matter, combined with the addition a small voltage (>0.2 V in practice) specially designed microbial electrolysis cells (MECs), can result high yield hydrogen gas. While was invented only few years ago, rapid developments have led yields approaching 100%, energy based on electrical input many times greater than that possible by water electrolysis, and increased gas production rates. MECs used make are similar design fuel...

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...

Previous studies have shown that the application of cation exchange membranes (CEMs) in bioelectrochemical systems running on wastewater can cause operational problems. In this paper effect alternative types ion membrane is studied biocatalyzed electrolysis cells. Four are used: (i) a CEM, (ii) an anion (AEM), (iii) bipolar (BPM), and (iv) charge mosaic (CMM). With respect to electrochemical performance four configurations, rated order AEM > CEM CMM BPM. However, with transport...

We developed an integrated system for storage of renewable electricity in a microbial fuel cell (MFC). The contained capacitive electrode that was inserted into the anodic compartment MFC to form bioanode. This bioanode compared with noncapacitive on basis performance and capacity. capacity were investigated during polarization curves charge-discharge experiments. During reached maximum current density 1.02 ± 0.04 A/m(2), whereas output only 0.79 0.03 A/m(2). experiment 5 min charging 20...

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...

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....

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...

Nitrogen (N) is an essential nutrient for plants and plays important role in agriculture. However, the cycle between nitrogen input into agriculture content wastewater has been broken. Recently, recovery from was demonstrated using electrochemical system (ES) combined with a gas permeable membrane. Once concentrated, ammonia recovered acid, producing either ammonium sulfate (AS) or nitrate (AN). The ES operated at different conditions while guaranteeing certain removal concentrated...

Ammonia recovery from centrate of an anaerobic digester was investigated using onsite bipolar-electrodialysis (BP-ED) pilot scale plant coupled to two liquid/liquid membrane contactor (LLMC) modules. To investigate the process performance and robustness, operated at varying current densities, load ratio (current nitrogen loading), in continuous intermittent (Donnan) mode. A higher led total ammonium (TAN, sum ammonia ammonium) removal efficiency, whereas increase applied did not have a...

The use of granular electrodes in Microbial Fuel Cells (MFCs) is attractive because granules provide a cost-effective way to create high electrode surface area, which essential achieve current and power densities. Here, we show novel reactor design based on capacitive granules: the fluidized bioanode. Activated carbon (AC) are colonized by electrochemically active microorganisms, extract electrons from acetate store granule. Electricity harvested AC an external discharge cell. We...

Bioelectrochemical systems (BESs) are a novel, promising technology for the recovery of metals. The prerequisite upscaling from laboratory to industrial size is that high current and power densities can be produced. In this study we report copper sulfate stream (2 g L(-1) Cu(2+)) using scale BES at rate. To achieve this, used novel cell configuration reduce internal voltage losses system. At anode, electroactive microorganisms produce electrons surface an electrode, which generates stable...

The use of high surface area electrodes, like carbon-based felt or granules, in Bioelectrochemical Systems is crucial for volumetric current production. In case activated carbon granules are used, charge can also be stored the form an electric double layer pores, which has been shown to improve bioanode performance. So far, it not known how much generated by a single granule. this study, we investigate production and storage behavior Two types one graphite granule tested find untapped...

Understanding the electrochemical properties of bio-anodes is essential to improve performance bioelectrochemical systems. Electrochemical Impedance Spectroscopy (EIS) often used study these in detail. Analysis EIS response, however, challenging due interfering effect large capacitance typically graphite and carbon-based electrodes. In this study, we flat electrodes made conductive Fluorine-doped Tin Oxide (FTO) as anode, monitored bio-anode performance. We show that with configuration, it...