Jul. 28, 2025
Machinery
Biogas digesters – a simple form of technology that turns waste into fuel – have been around for centuries. But only recently have intrepid urban homesteaders begun adding this nifty piece of equipment alongside their chicken coops, vegetable gardens, and rain barrels.
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One way to bring biogas to your home is by purchasing a ready-to-use system. HomeBiogas offers a backyard-scale model that retails for under $. The Israel-based company claims to have sold their devices, which resemble a small tent and are capable of producing an hour of cooking fuel per liter of food waste, to about families in 76 countries.
It’s also possible to build a biogas digester DIY-style, but keep in mind that doing so is significantly more complex than creating a compost pile or installing a rain barrel.
Even if you buy a pre-fab kit, successfully converting waste to usable fuel takes dedication – and, sometimes, a lot of trial and error. That’s why we’ve created this little tutorial to fill you in on the basics. Think of it as Biogas 101. Let’s begin class:
What Is the Difference between Biofuel and Biogas?
Organic waste, whether animal manure, humanure, grass clippings, or food scraps, can be converted into liquid fuel (ethanol) or gas fuel (methane). The former, often referred to as biofuel, is produced on a large scale in the Midwest, mixed with petroleum-based gasoline, and sold at gas pumps throughout the country. The latter product, often referred to as biogas, is sometime harvested from landfills, sewage treatment facilities, and the manure lagoons at factory farms, which typically convert the fuel to electricity to power their operations.
How Can I Use Biogas?
At the home scale, biogas is not typically converted to electricity, but used directly as a cooking fuel. Biogas is nearly identical to fossil fuel-based natural gas, and can be used in household applications like furnaces, water heaters, stoves, and ovens. Minor modifications may be required on some appliances, however (converting a standard stove, for example, simply requires the removal of the pressure-reducing nozzle inside each burner). Biogas digesters also produce liquid and solid byproducts, which may be used as fertilizer.
How Does a Biogas Digester Work?
Most people are familiar with aerobic decomposition – this is what occurs in any successful compost pile. Anaerobic decomposition, in contrast, is what takes place in the mucky soils of a swamp, or in a waterlogged compost pile. The microbes that naturally proliferate in such conditions give off awful, gaseous smells as they do their work. Those gases are combustible if captured in a sealed tank or other container – and by capturing the gas, you also capture the smell.
The Internet is awash in DIY digester designs, but all employ a few basic features. The main component is a sealed tank where the digestive process (decomposition, that is) takes place and the gas is collected. This could be a 55-gallon drum, a plastic water tank, or a rubber “bladder” (imagine a giant Ziploc bag made of thick rubber). The feedstock (i.e. manure, kitchen scraps, etc.) is deposited through a chute on one side of the tank; some systems also incorporate a grinder that shreds the material into a uniform sludge, which increases the efficiency of the device.
On the opposite side of the tank, an overflow valve allows wastewater to be diverted for irrigation, while a valve on top channels methane to household appliances through the ordinary gas pipe found any home supply warehouse. A special type of filter must be fitted onto the gas line to remove hydrogen sulfide, a naturally-occurring, but extremely stinky, component of biogas.
Can a Biogas Digester Be Used in Any Climate?
Yes, in theory.
Biogas digesters are most common in tropical countries because the microbes that do the magic require warm weather to proliferate – 70- to 80-degree temperatures are needed day and night for optimal performance. In colder climates, they are often placed in a greenhouse or underground for insulation. Otherwise, some form of artificial heat must be provided to ensure a reliable source of fuel in the winter months – which defeats the purpose, of course. Summer-only operation is always an option.
What Kind of Maintenance Does a Biogas Digester Require?
The daily operation of a biogas digester consists primarily of adding the raw materials and harvesting the nutrient-rich water that overflows from the tank (living tissue is primarily water, which is released in the process of decomposition). The thick sludge that accumulates at the bottom of the tank must be removed occasionally (it is an excellent fertilizer).
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Suggested reading:It is also important to monitor the pH inside the tank on a regular basis. Depending on the raw materials used and other environmental factors, the slurry inside the tank can easily tip toward the acidic end of the pH scale, which causes the microbes to die off and biogas production to cease. Acidification is easily remedied with the addition of an alkaline substance like lime or baking soda.
Is It Safe?
While biogas is, of course, flammable, small-scale digesters do not pressurize the fuel to the degree of, say, a propane tank. This reduces the risk of explosion to almost nil. If the gas does escape from the tank, it simply dissipates into the air. Ventilation is required when using a digester inside a greenhouse, as breathing the gas in an enclosed space is hazardous to health.
Is It Legal?
American building codes, to our knowledge, do not directly address home-scale biogas digesters. Most people using them are unlikely to seek permission from local authorities, nor is it clear that they are required to. In essence, biogas digesters are simply a wet, enclosed compost pile, and that is certainly legal. On the other hand, they could be viewed as a device to hold flammable gases, which is the sort of thing that concerns building inspectors. Proceed at your own risk.
What’s Better: DIY or a Kit?
The trade-off here is price versus willingness to tinker. Biogas-producing microbes are finicky and may not do their job if conditions aren’t just right – so it may be totally worthwhile to pay for a product that has been refined by professional designers who have worked out all the kinks. On the other hand, a DIY digester can be built for as little as $50 in parts.
How Can I Learn More/Connect with Others?
Biogas is a combustible gaseous fuel that is collected from the microbial degradation of organic matter in anaerobic conditions. Biogas is principally a mixture of methane (CH4) and carbon dioxide (CO2) along with other trace gases. Biogas can be collected from landfills, covered lagoons, or enclosed tanks called anaerobic digesters.
Biogas is commonly made from animal manure, sludge settled from wastewater, and at landfills containing organic wastes. However, biogas can also be made from almost any feedstock containing organic compounds, both wastes and biomass (energy crops). Carbohydrates, proteins and lipids are all readily converted to biogas. Many wastewaters contain organic compounds that may be converted to biogas including municipal wastewater, food processing wastewater and many industrial wastewaters. Solid and semi-solid materials that include plant or animal matter can be converted to biogas.
Methane is the principal gas in biogas. Methane is also the main component in natural gas, a fossil fuel. Biogas can be used to replace natural gas in many applications including: cooking, heating, steam production, electrical generation, vehicular fuel, and as a pipeline gas.
Biogas is being collected and used to generate electricity or steam at many landfills, wastewater plants and breweries in Florida. However, many opportunities for biogas production are yet to be implemented. Until recently, the low cost of fossil fuels has hindered implementation of biogas production. There is a limited awareness of the potential and advantages of biogas production by citizens, government officials, and in the business sector that has limited interest in biogas production. More education, demonstration and investment in biogas technology would help overcome these barriers.
The broad types of wastes and biomass feedstocks that are suitable for production of biogas and limited data on production levels and biogas yields make it difficult to accurately calculate the total amount of biogas, which can be produced in the state. If the annual biogas potential from only municipal wastewater, dairy manure, poultry manure, MSW, and energy crops is estimated, a rough potential of 205.7 billion cu ft of natural gas equivalent results, which is half of the 400 billion cu ft of natural gas used for electrical generation in Florida in .
Biogas production can reduce the pollution potential in wastewater by converting oxygen demanding organic matter that could cause low oxygen levels in surface waters. Nutrients, like nitrogen and phosphorous are conserved in biogas effluents and can be used to displace fertilizers in crop production.
While combustion of biogas, like natural gas, produces carbon dioxide (CO2), a greenhouse gas, the carbon in biogas comes from plant matter that fixed this carbon from atmospheric CO2. Thus, biogas production is carbon-neutral and does not add to greenhouse gas emissions. Further, any consumption of fossil fuels replaced by biogas will lower CO2 emissions.
Biogas can be made at home or at a business from food waste, yard and grass trimmings, and some organic solid wastes. However, efficient use of biogas is more readily accomplished at larger scales. A typical home might cook for an hour per day on biogas from home waste sources.
Current prices for natural gas are around $7 per cuft. Depending on the particular application this is very similar to current estimates for the cost of biogas production.
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