MICROBIAL FUEL CELL

A microbial fuel cell is a bio electrochemical device that uses living microorganisms to convert chemical energy stored in organic matter directly into electricity.

There are several types of microbial fuel cells and they are; double chamber, single chamber, stacked, sediment, upflow, tubular, microbial desalination cell, and microfluidic microbial fuel cells.

Double chamber microbial fuel cell consists of two separate chambers, an anode chamber and a cathode chamber, separated by a proton exchange membrane (PEM). The anode chamber contains the microorganisms that breakdown the organic matter, releasing electrons and protons. The electrons flow through an external circuit to the cathode chamber, where they are used to reduce oxygen or other electron acceptors. The protons flows through the proton exchange membrane (PEM) to the cathode chamber where they are used to form water.

Single chamber microbial fuel cell has a single chamber that contains both the anode and cathode electrodes. The microorganisms break down the organic matter releasing electrons and protons which are then used to generate electricity.

Stacked microbial fuel cell consists of multiple microbial fuel cells connected in series or parallel to increase the power output. Each microbial fuel cell has its own anode and cathode electrodes and the electrons are transferred between the microbial fuel cells through external connections.

Sediment microbial fuel cell uses a porous electrode placed in sediment or soil to harness energy from the microorganisms present in the sediment, while producing electricity.

Upflow microbial fuel cell has an upflow configuration where the waste water flows upwards through the microbial fuel cell, allowing for efficient treatment and power generation.

Tubular microbial fuel cell has a tubular configuration where the microbial fuel cell is shaped like a tube and the waste water flows through it while producing electricity.

Microfluidic fuel cell is a miniaturized microbial fuel cell that uses microfluidic channels to manipulate and control the flow of fluids and microorganisms while producing electricity.

The advantages of microbial fuel cells are; microbial fuel cells (MFCs) can produce electricity from renewable biomass sources such as wastewater, agricultural waste and marine sediments. MFCs have low operating costs as they do not require expensive catalyst or energy inputs. MFCs can sequester carbon dioxide from the atmosphere and convert it into electricity. MFCs can be used to treat wastewater while producing electricity. MFCs can be achieve, high efficiency in converting chemical energy into electrical energy. MFCs have a low environmental impact as they do not produce greenhouse gases or other pollutants during operation. MFCs can be designed to operate in a variety of environments and can be used for a wide range of applications.

The disadvantages of microbial fuel cells (MFCs) are; MFCs have relatively low power output compared to traditional fuel cells. MFCs are still in the early stages of development and scaling up the technology to commercial levels is a significant challenge. The stability of microorganisms in MFCs can be a challenge as they can be affected by changes in environmental conditions. The choice of electrode material can affect the performance and lifespan of M FCs. The capital costs of MFCs can be high, although they are decreasing as the technology advances. MFCs have a limited lifespan, typically ranging from a few months to a few years.

Microbial fuel cells find applications in the following; MFCs can be used to treat waste water, while producing electricity. MFCs can be used to generate power in remote areas or for small scale applications. MFCs can be used to clean up contaminated soil and ground water. MFCs can be used to power sensors to monitor water quality and detect pollutants. MFCs can be used to develop biodegradable materials that can replace traditional plastics. MFCs are used for the recycling of organic waste in space travel. MFCs embedded in soil can monitor nutrient levels and microbial activities while generating electricity and supporting precision agriculture. Microbial desalination cells (MDCs) can remove salt ions from brackish water simultaneously with electric generation.

The future of microbial fuel cells is based on the advances and development of the following technologies; research is ongoing to scale up MFCs to commercial levels, improve their performance and efficiency. MFCs are being explored for new applications such as bio-hydrogen and bio-methane production. MFCs are being integrated with other technologies such as solar panels and wind turbines to create hybrid systems. Research is ongoing to use MFCs to harness energy from marine environments such as ocean current and tidal power. MFCs in the future could be used to clean uo contaminated soil and ground water. MFCs could be used to generate power for space missions and develop implantable devices that can generate power from the body’s own fluids. MFCs are increasingly being combined with; membrane bioreactors, microbial electrolysis cells, algal bioreactors, anaerobic digesters to create a multifunctional hybrid and integrated systems.

 

SOURCES:

• Microbial fuel cells by Bruce E. Logan (editor).
• Microbial fuel cell: A bioelectrochemical system that converts waste to watts by Debabrata Das.
• Microbial fuel cells: principles and applications by Haluk Beyenal, Zhiyong Jason Ren and Bruce Logan.
• Microbial electrochemical system for energy harvesting and bioremediation by Eric T. Linderboom and Cees J. Buisman.
• Sustainable energy from microbial fuel cells by Yifeng Zhang, Zhiyong Jason Ren and Bruce Logan.