Beatrice Lang
Human waste can be converted into electricity through various methods, including the use of microbial fuel cells (MFCs), advanced poop-to-power plants, sludge pyrolysis, and innovative toilet systems. MFCs utilize human feces wastewater as a substrate to generate electricity, while advanced poop-to-power plants employ bacteria that digest sludge and produce methane. Pyrolysis involves converting sludge into char pellets that can replace coal, while new toilet systems separate liquid and solid wastes, using solid waste to produce biogas or methane for electricity generation. These methods not only generate electricity but also offer environmental benefits by reducing greenhouse gas emissions and providing renewable energy sources.
| Characteristics | Values |
|---|---|
| Process | Human waste is broken down into a dehydrated, odourless compost-like material. This is then converted into biodiesel or heat energy. |
| Technology | Microbial fuel cells (MFCs) are used to generate electricity during the process of wastewater treatment. |
| Use Cases | Human waste can be used as a renewable energy source to power vehicles, as demonstrated in Grand Junction, Colorado. It can also be used for heating or to power generators and micro-turbines. |
| Benefits | Reducing greenhouse gas emissions, decreasing reliance on fossil fuels, and improving sanitation issues. |
| Monetization | Treated human excrement can be traded for virtual or digital currency using a smartphone application. |
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What You'll Learn
Microbial fuel cells (MFCs)
MFCs have been described as "bioreactors that convert the energy in the chemical bonds of organic compounds into electrical energy through the catalytic activity of microorganisms under anaerobic conditions". The microbes' need for a compatible electron acceptor to deposit electrons is fulfilled by the anode of an MFC in the absence of a more suitable acceptor. The electrons collected by the anode are channelled across an external load (resistor) to harness usable energy. The final step of the electron transport occurs at the cathode in the presence of a terminal electron acceptor. Thus, a 'quasi-engineered' electron transport chain that mimics the bacterial respiratory chain forms the core of an MFC.
MFCs can be used to address three major sustainability issues: energy security, global warming, and wastewater management. MFCs can convert energy more efficiently than standard internal combustion engines, and in theory, an MFC is capable of energy efficiency far beyond 50%. MFCs can be coupled with wastewater treatment plants, using chemical process wastewater and synthetic wastewater to produce bioelectricity. MFCs have also found commercial use in the treatment of wastewater, with the city of Grand Junction in Colorado using MFCs to process human waste into renewable natural gas (RNG) or biomethane, which is then used to fuel fleet vehicles.
Research on MFCs has focused on four key aspects: minimising electrochemical losses, improving performance efficiency, lowering working costs, and scaling up systems for practical applications. MFCs have gained significant research interest, with an increasing number of publications on the topic in scientific, peer-reviewed journals.
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Anaerobic digestion
The anaerobic digestion process occurs in a sealed vessel called a reactor, which varies in shape and size depending on the site and feedstock conditions. These reactors contain complex microbial communities that break down the organic waste and produce biogas and digestate. Multiple organic materials can be combined in one reactor through a process called co-digestion, which helps increase biogas production from low-yielding or challenging-to-digest waste. Examples of co-digested materials include food waste, energy crops, crop residues, and fats, oils, and greases.
The use of anaerobic digestion facilities can help reduce the amount of waste transported to landfills or incineration facilities, thereby reducing carbon emissions from collection vehicles. Localised anaerobic digestion facilities embedded within an electrical distribution network can also minimise electrical losses associated with transporting electricity over a national grid. Additionally, anaerobic digestion can be employed to remediate sludge polluted with PFAS, significantly reducing the concentration of these harmful substances in sewage sludge.
In terms of renewable energy, anaerobic digestion offers a way to convert waste into electricity, heat, or vehicle fuel. This reduces dependence on fossil fuels, lowers greenhouse gas emissions, and improves environmental quality. For example, the Persigo Wastewater Treatment Plant in Grand Junction, Colorado, processes 8 million gallons of human waste into RNG, fuelling about 40 fleet vehicles. Similarly, the AgEnergy USA project in California aims to provide electricity to Sacramento County using RNG derived from food waste.
The implementation of anaerobic digestion has gained attention from governments worldwide due to its potential for waste-to-energy conversion and environmental benefits. For instance, the AgSTAR program in the United States promotes the use of anaerobic digesters on livestock farms to reduce methane emissions from animal waste. By encouraging the recovery and utilisation of biogas generated from organic waste, countries can turn waste management into a revenue opportunity while contributing to a more sustainable future.
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Biogas
The raw biogas can then be refined and upgraded to renewable natural gas (RNG) or biomethane by removing impurities and increasing its methane content. This RNG can be used interchangeably with fossil fuel-produced gas and has the potential to fuel anything that runs on natural gas. It can be injected into natural gas pipelines or used as vehicle fuel, powering engines, generators, microturbines, and fuel cells.
In the United States, cities like Grand Junction, Colorado, have implemented successful biogas initiatives. The Persigo Wastewater Treatment Plant processes 8 million gallons of human waste into RNG, which is then used to fuel about 40 fleet vehicles, including garbage trucks and buses. This reduces greenhouse gas emissions and provides an alternative to fossil fuels.
Additionally, the EPA's Landfill Methane Outreach Program (LMOP) encourages the waste industry to recover and utilize biogas generated from organic waste in landfills. Biogas systems provide revenue opportunities for farms, dairies, and industries while also reducing environmental impacts and creating local jobs.
The use of biogas as an energy source offers multiple benefits, including waste management, revenue generation, and a reduction in greenhouse gas emissions. By converting human waste into biogas, we can not only address sanitation issues but also harness a valuable renewable energy resource.
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Heat-harnessing solar cells
The concept of heat-harnessing solar cells revolves around their ability to reflect a significant portion of the energy they cannot convert into electricity. This reflection mechanism enables the storage of renewable energy as heat, providing an alternative to solely relying on light conversion.
One notable example of heat-harnessing solar cells in development is the thermoelectric generator created by scientists from the University of California, Riverside. This generator employs inexpensive materials, such as nickel-iron Permalloy and p-type silicon, to convert low-level waste heat into electricity. The device leverages the spin-Seebeck effect, where a temperature gradient induces a spin current, resulting in the generation of electrical voltage.
The applications of heat-harnessing solar cells are far-reaching. They can be integrated into photovoltaic solar panels, automobiles, computer chips, and household appliances to capture waste heat and enhance energy output. This versatility highlights the potential for widespread adoption in various industries.
Additionally, thermocells, a type of heat-harnessing technology, offer a cost-effective solution for converting heat into electricity. Thermocells operate without moving parts, generating electricity quietly and efficiently while minimising greenhouse gas emissions. This technology can be applied to a range of heat-radiating sources, including car engines, solar cells, and refrigerators, capturing and utilising low-temperature waste heat.
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Pyrolysis
One of the advantages of pyrolysis is its ability to minimise and eliminate corrosion and pollution compared to conventional charcoal production. By preserving alkaline, heavy metals, sulphur, and chlorine in plant residues, the development of large chlorinated aromatic chemicals can be prevented. Additionally, pyrolysis has a very low-temperature requirement, making it more energy-efficient than other systems used for energy generation from MSW.
The rotary pyrolysis technique is the most commonly used process for MSW pyrolysis due to its ample heat transfer and low energy consumption. To ensure the environmental friendliness of the process, pyrolysis facilities should be equipped with emission control systems.
Overall, pyrolysis offers a promising and eco-friendly solution for generating electricity from human waste by converting it into valuable energy sources such as biofuel and bio-oil.
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Frequently asked questions
The process of converting human waste into electricity reduces the negative impact of urbanization on ecosystems. It also helps to reduce greenhouse gas emissions when fossil fuels are replaced by renewable natural gas (RNG).
Human waste can be converted into electricity through a microbial fuel cell (MFC) or a microbial energy production system. MFCs use human feces wastewater as a substrate to generate electricity. The wastewater is first pretreated and then fed into the MFC, which produces electricity through a biological process. The microbial energy production system converts human waste into biodiesel or heat energy, which can be used to generate electricity.
The Persigo Wastewater Treatment Plant in Grand Junction, Colorado, processes 8 million gallons of human waste into RNG, which is then used to fuel about 40 fleet vehicles. In South Korea, the Ulsan National Institute of Science and Technology (UNIST) has built an outdoor laboratory called the Science Walden Pavilion, which treats human excrement and converts it into renewable energy. Nanyang Technological University (NTU) has also developed a No-Mix Vacuum Toilet that separates liquid and solid wastes and converts them into electricity and fertilizer.
