What is microbial fuel cell wastewater treatment

A microbial fuel cell is a rapidly growing, eco-friendly and green technology. As per this technology, the microorganisms are employed to convert the chemical energy stored in the biodegradable portion of organic matter into direct electric current by simultaneously treating the wastewater.

How does a microbial fuel cell work?

Microbial fuel cells work by allowing bacteria to do what they do best, oxidize and reduce organic molecules. … Microbes at the anode oxidize the organic fuel generating protons which pass through the membrane to the cathode, and electrons which pass through the anode to an external circuit to generate a current.

What are the different types of microbial fuel cells?

There are two types of microbial fuel cells (MFCs): mediator or mediator-less. The mediator type was demonstrated in the early 20th century and uses a mediator: a chemical that transfers electrons from the bacteria in the cell to the anode.

How does MFC treat water?

1.1. An MFC typically contains two electrodes (anode and cathode). Bacteria on the anode decompose organic matter in wastewater producing electrons and protons. The electrons flow to the cathode through an external circuit, generating electricity, and protons diffuse from the anode to the cathode.

What is the role of microorganisms in wastewater treatment?

Microorganisms are the workhorses of wastewater treatment systems and anaerobic digesters, where they are responsible for removal of pollutants and pathogens, recovery of nutrients and energy, and producing clean water.

What is a microbial electric cell?

A microbial electrolysis cell (MEC) is a technology related to Microbial fuel cells (MFC). Whilst MFCs produce an electric current from the microbial decomposition of organic compounds, MECs partially reverse the process to generate hydrogen or methane from organic material by applying an electric current.

What bacteria is used in microbial fuel cells?

Gram-negative microorganisms used in MFC are presented Bacillus violaceus, Escherichia coli, Pseudomonas fluorescens, Proteus vulgaris, Pseudomonas methanica, Desulfuromonas acetoxidans, Geobacter sulfurreducens, Methylovorus dichloromethanicum, Methylovorus mays, Shewanella putrefaciens, Geobacter metallireducens, …

How is wastewater produced?

Wastewater is the polluted form of water generated from rainwater runoff and human activities. It is also called sewage. It is typically categorized by the manner in which it is generated—specifically, as domestic sewage, industrial sewage, or storm sewage (stormwater).

Where are microbial fuel cells used?

MFCs are attractive for power generation applications that require only low power, but where replacing batteries may be impractical, such as wireless sensor networks. Wireless sensors, powered by microbial fuel cells can then for example be used for remote monitoring (conservation).

What does Chemical Oxygen Demand measure?

The chemical oxygen demand (COD) test is commonly used to indirectly measure the amount of organic compounds in liquid waste. It is expressed in milligrams/grams per liter, which indicates the mass of oxygen consumed per liter of solution. Older references may express the units as parts per million (ppm).

Article first time published on

How efficient are microbial fuel cells?

Microbial fuel cells (MFC) allowed more than 99.9% of Fe removal (final pH of 7.7). Electrocoagulation using Fe electrodes efficiently removed Fe (>94%) after 60 min. MFC is more efficient than electrocoagulation to treat Fe-rich acid mine drainage.

What can microbial fuel cells power?

Biodegradable matter in waste materials such as faeces and urine can be converted into electricity. This was demonstrated in a microbial fuel cell latrine in Ghana, which suggested that toilets could in future be potential power stations.

What is microbial waste treatment?

Microbial Wastewater Treatment focuses on the exploitation of microorganisms as decontaminating tools to treat polluted wastewater, a worldwide concern. Microorganism-based processes are seen as promising technologies to treat the ever-increasing problem of polluted wastewater.

What microbes are used in wastewater treatment?

• 2.1. Bacteria. They play vital role in the wastewater treatment and are primarily responsible for removing and transforming these organic compounds in an effluent treatment. …
• 2.2. Protozoa. …
• 2.3. Metazoa. …
• 2.4. Filamentous bacteria. …
• 2.5. Algae. …
• 2.6. Fungi.

What are the 3 stages of wastewater treatment?

There are three main stages of the wastewater treatment process, aptly known as primary, secondary and tertiary water treatment.

Why microbial fuel cells are considered a source of sustainable energy?

1. They use living organisms as catalysts to generate electricity from certain substrates. 2. … They can be installed in waste water treatment plants to cleanse water and produce electricity.

What is the role of microbes in bioremediation?

Principle of bioremediation Microorganisms are suited to the task of contaminant destruction because they possess enzymes that allow them to use environmental contaminants as a food. … For bioremediation to be effective, microorganisms must enzymatically attack the pollutants and convert them to harmless products.

What is microbial energy?

In microbial energy technologies, microorganisms make fuels out of raw organic materials, thereby converting the chemical energy in the biomass into chemical energy in the form of ethanol or hydrogen, for example. In addition, microbes can convert solar energy to hydrogen.

How do bacteria produce electrons?

Microorganisms decompose organic or inorganic matters (or substrates) in the anode chamber to produce electrons. These electrons flow from anode to cathode via an external circuit made of conductive materials, such as copper-based wires, to generate electricity.

How is bioremediation done?

Bioremediation relies on stimulating the growth of certain microbes that utilize contaminants like oil, solvents, and pesticides for sources of food and energy. … Bioremediation can either be done “in situ”, which is at the site of the contamination itself, or “ex situ,” which is a location away from the site.

Is microbial fuel cell the future?

Technologies that utilize microbial metabolisms to break down organic/inorganic matter in order to produce an electrical current could be a promising solution for both power generation and waste management in the future.

How can microbes provide fuels for cars and electricity?

In devices, called microbial fuel cells (MFC) they can extract electrons from their food sources such as organic materials and feed them into an electrical circuit to generate power. This way they can even turn plain soil into a source of energy!

What are the 5 steps of wastewater treatment?

1. Step 1: Screening and Pumping. …
2. Step 2: Grit Removal. …
3. Step 3: Primary Settling. …
4. Step 4: Aeration / Activated Sludge. …
5. Step 5: Secondary Settling. …
6. Step 8: Oxygen Uptake. …
7. Sludge Treatment.

How is wastewater treated?

1. Wastewater treatment is a process used to remove contaminants from wastewater and convert it into an effluent that can be returned to the water cycle. …
2. Processes commonly used include phase separation (such as sedimentation), biological and chemical processes (such as oxidation) or polishing.

What are the 2 types of wastewater?

Two types of wastewater First of all, wastewater can be broken down into two broad categories – sewage and non-sewage.

What is chemical oxygen demand in wastewater treatment?

Chemical oxygen demand (COD) is the amount of dissolved oxygen that must be present in water to oxidize chemical organic materials, like petroleum. COD is used to gauge the short-term impact wastewater effluents will have on the oxygen levels of receiving waters.

Why is COD high in wastewater?

Sources: COD increases as the concentration of organic material increases. It also increases if inorganic compounds susceptible to oxidation by the oxidant (typically dichromate) are present. Water with high COD typically contains high levels of decaying plant matter, human waste, or industrial effluent.

Why is COD higher than BOD?

COD is normally higher than BOD because more organic compounds can be chemically oxidised than biologically oxidised. This includes chemicals toxic to biological life, which can make COD tests very useful when testing industrial sewage as they will not be captured by BOD testing.

Why are microbial fuel cells important?

Nevertheless, using microbial fuel cells may help reduce environmental contaminants such as wastewater, reduce atmospheric carbon dioxide by using it to rebuild fuels, and may potentially provide a renewable energy source. Microbial fuel cells create electricity through the use of microorganisms.

Which of these bacteria is a redox mediator in microbial fuel cells?

For instance, Pseudomonas aeruginosa can produce pyocyanin and phenazine-1-carboxamide as redox mediators for electricity generation in BES [44,45], and many Shewanella species (well-known Fe(III)-respiring bacteria) can excrete flavins (riboflavin and flavin mononucleotide) as redox mediators to facilitate exocellular …

What is an example of a biofilm?

Biofilms are a collective of one or more types of microorganisms that can grow on many different surfaces. Microorganisms that form biofilms include bacteria, fungi and protists. One common example of a biofilm dental plaque, a slimy buildup of bacteria that forms on the surfaces of teeth. Pond scum is another example.