Microbial electrochemical technologies

Photos Description


The gradostat is an interconnected set of chemostats (0.5 L) that creates a gradient of solute concentrations, while maintaining the exponential growth of microbes. Each chemostat is a single chamber microbial electrolysis cell containing a working (graphite), counter (Ti/Pt), and reference (Ag/AgCl) electrode. This allows for the study of both the physiology and electrochemistry of microbes under a gradient of selective pressure.
Lab-scale Microbial Electrochemical Reactor for environmental biotechnology studies

Cross section: 100 cm2. Electrodes: Ti/Ir, graphite collectors, graphite felt. Membranes: anionic and cation exchange membranes. Tank volume: 2-5 L. Flow rate:100-300 mL/min.

Electrocoagulation reactor for wastewater treatment and removal of pollutants

Electrode area: 120 cm2. Number of electrodes: 16. Volume: 2 L. Mode operation: batch and continuous. Flow rate: 5-25 L/h.

Pre-Industrial Microbial Desalination Stack for sustainable desalination of brackish and sea water using organic matter Pre-Industrial Microbial Desalination Stack for sustainable desalination of brackish and sea water using organic matter

Cross section: 600 cm2. Compartments: 15-20 units. Electrodes: isostatic graphite + graphite felt / air diffusion cathode (Co/Mn based catalyzed carbon). Membranes: ion exchange membranes (anionic and cationic).

Applications: brackish desalination, removal of inorganic compounds from water (nitrate, sulphate, ammonia), sea water desalination, urban/industrial wastewater treatment for irrigation.

MET4Nitrogen MET4Nitrogen

It is a treatment system designed for the removal of nitrogen from waters with low loads of organic matter. It reproduces on a small scale a constructed wetland based on MET (Microbial Electrochemical Technologies), that is, a METland®, adapted to create anaerobic conditions that give rise to denitrification reactions. It consists of a first part of the enrichment of dissolved organic matter, based on the decomposition of plant materials, and a second part where the denitrification process takes place, accelerated thanks to the presence of electroactive microorganisms. It has a treatment flow of 500 L / day.

Applications: from tertiary treatments for the removal of nitrates in waters with low loads of organic matter –such as the effluents from WWTP (Wastewater treatment plants), until water extracted from aquifers contaminated with high nitrogen loads.

METland® for treating real wastewater and removed of pollutants METland  for treating real wastewater and removed of pollutants

This system, with which the wastewater from IMDEA Agua is treated, is based on the combination of the constructed wetlands with MET (Microbial Electrochemical Technologies). The METland® has an area of 10 m2  and is powered by pulses. In addition, it has a meteorological station and a continuous sensor system, both at the entrance and at the exit to measure water quality parameters.

Applications: removal of organic and inorganic components from water and removal of emerging contaminants. Treatment indicated for both urban and industrial water.

Electrogenic biofilters Electrogenic biofilters

For treating different kinds of wastewaters containing organic matter, can either be aerobic or anaerobic and combine them depending on the wastewater. Vertical reactor variant of the urban WW metlands re-purposed for industrial wastewater treatments. Volumes: 0,5-1L. Continuous or intermittent operation mode systems, with treating capacities ranging from 0,25 to 2 L/d. The reactor material is glass, filled with electrically conductive carbonous material of size range 3-7mm.

Gas cromatography

Agilent 490 micro GC portable Gas Chromatograph for direct in-line coupling to laboratory and field bioelectrochemical systems. This compact and portable equipment allows the detection and quantification in a few seconds of the presence of CO2, CH4, H1 and CO present in reactors and wastewater treatment and environmental decontamination units.

Electrochemical instrumentation

Two bipotentiostats / galvanostats μSTAT400 from Dropsens. They allow performing experiments with screen-printed electrodes (SPE) of different materials (coal, gold, PEDOT, ITO, etc.), with volumes of sample as small as a drop (50 μL). They also support the study and comparison of up to two working electrodes simultaneously.

Potentiostats model NEV4 from Nanoelectra, to monitor the operation of small-sized bioelectrochemical systems using chronoamperometers, cyclic voltammetry and power curves. Biologic Potentiostat SP-150. This equipment allows cyclic voltammetry, chronoamperometry and polarization curves to be performed routinely in bioelectrochemical systems. The model incorporates the Electrochemical Impedance Spectroscopy (EIS) module to perform the analysis and characterization of bioelectrochemical systems in terms of equivalent electrical circuits.

Nanoelectra Potentiostat NEV3. This equipment allows cyclic voltammetry, chronoamperometry and polarization curves to be performed routinely in bioelectrochemical systems that have electrical current requirements of up to 1A.

SolRayo Potentiostat, for bioelectrochemical applications of larger scale and higher powers. It has five independent channels of up to 2 A of current. Potentiostat NEV6 of Nanoelectra S.L., for bioelectrochemical applications with higher and larger scale power consumption requirements. It has eight independent channels of up to 1.5 A of current and 20 V of potential difference between the working electrode and the counter electrode.

Digital multimeters for automatic data acquisition. Keithley model 2700, with up to 40 DC / AC measurement channels, and two electrical current measurement channels.

Microbial Electrochemical Fluidized Bed Reactors (ME-FBR) Microbial Electrochemical Fluidized Bed Reactors (ME-FBR)

For wastewater treatment and to produce valuable products (bioelectrosynthesis)
Different electroconductive particles are used as fluidized electrode (electroconductive activated carbon, glassy carbon, functionalized activated/glassy carbon, etc).
BIOE group has designed ME-FBR with different working volumes (0.15 L, 0.50 L, 1.0 L) and configurations (wastewater treatment, denitrification, bioelectrosynthesis, etc) to work in continuous mode, semicontinuous mode and batch mode.