What is a Biodigester?
A Biodigester simply means a tank which digests organic material biologically. A biodigester Tank is biological tank which digests, anaerobically, without air, organic material and produces methane gas for cooking, lighting and heating ect.
Meriam Webster dictionary defines a biodigester as;
A device or structure in which the digestion of organic waste matter by bacteria takes place with the production of a burnable biogas and a nutrient-rich slurry.
This anaerobically process takes place in a digester tank where bacteria to converts the waste into water and methane. The composition of the gases produced by this type of biodigester is about 60% Methane, 30% Carbon Dioxide.
Water leaves the tank for re-use in other places. The bacteria used are anaerobic. This means that they can survive in places where there is no oxygen. In addition, they procreate and multiply themselves. For this reason, the systems don’t require another dosing.
However, for a Biodigester to produce enough methane to make it practical for cooking alone, it would require all the household waste and toilet waste plus more manure from large farm animals. The Intergovernmental Panel on Climate Change (IPCC) estimates that an average biodigester tank produces 25.5 g of methane per user per day, which is not enough even for cooking a one-pot evening meal. As most UK households do not keep cattle or pigs, small scale Biodigesters are not practical in the many homesteads
Biodigesters are, however, superb solutions for rural -urban communities, towns and cities where the system can be used for human waste management.
In rural areas, bio digesters are built in settlements where there is adequate animal manure for the sole purpose of producing Biogas.
Biodigester Solution For Human Waste Management
A biodigester does not need a sewage system. This is because solid waste is turned to water. The water leaves through an outlet or percolates to the ground. Bacteria in use work under a different range of temperature. A colourless and odourless gas commonly known as Bio Gas is generated.
The concept intends to address sanitation challenges facing most people in rural areas and many schools.
Biodigester Toilet Design
A biodigester toilet is a modern way to manage and control human waste. It is eco-friendly and maintenance free. It is most common in schools and in several individual residences mostly in rural areas.
Many people are replacing the traditional awful pit latrines and septic tanks with the modern biodigester toilets. The work involves construction of a biodigester based on the number of users or number of household members. of the toilet is done locally.
Bacteria in the systems decompose the waste and turn it to boil. A boil is a liquid rich in organic fertilizer. In addition, it is odourless, free from pathogens, and perfect for agriculture.
However, ensure that the person you are hired and trust to set up a biodigester is qualified and with the necessary skill. Checking for a license and a portfolio as poor installations can be catastrophic.
The toilets have a protruding ventilation unit. Ventilation ensures that they remain odourless as decomposition takes place. The ventilation system in some toilet includes a fan which uses wind energy. Most toilets have translucent roof material to allow adequate light inside. The toilets do not need water as well. As a result, it reduces the power and water bill.
The toilet is friendlier to children, unlike the old pit latrines that were prone to accidents. In design, the loo is never to be full. After installing a bio-toilet, you don’t dig another after a few years unlike in latrines.