Biodigesters : Modern Human Solid Waste Management
Biodigesters: Modern Human Solid Waste Management
What is a Biodigester?
Biodigesters system is a system that utilizes organic waste, particularly animal and human excreta and digests these organic material biologically to produce water and biogas. A biodigester consists of an airtight container that inhibits anaerobic bacteria microorganisms that breaks down the the waste. The fermentation process is anaerobic which takes place without oxygen and the bacteria responsible for decomposition are methanogenic. The processed waste is an organic pathogen-free water that is rich in nitrogen.
Many people think of a biodigesters are tanks that digests, anaerobically, without air, organic material and produces methane gas for cooking, lighting and heating. While this is true 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. Most standard biodigesters tanks produces 25.5 g of methane per user per day, which is not enough even for cooking a one-pot evening meal. These biodigesters therefore are mainly for human solid waste management.
Biodigesters are however, superb solutions for urban human waste management in areas where the sewage infrastructure system is not available. In rural areas, biodigesters can be used where there is adequate animal manure with the main purpose of biogas production . To produce 1 m3 of biogas, to cook 3 meals daily for a small family of 4 you need at least 5 litres of pig manure/day. 8 large pigs (breeding adults) will produce 5+ litres/day. An example of a simple biodigester for animal manure is shown below.
A simple home-made family Biodigester System
‘A typical simple biodigester is shown above.
Biodigesters for Waste Management
Biodigseters are the best waste water management option as it is a complete on-site sewer system, handling both grey and black water.
Biodigester system use biodegradation process to break down organic matter to produce methane gas and carbon dioxide. The natural aerobic and anaerobic bacteria acts on solid waste to completely bio-degrade ensuring that what remain is water and biogas. Water produced is released to the environment via French Drain.
Advantages of Biodigesters
Biodigester can be installed in;
4. Gated community
5. Petrol station
7. Commercial Buildings
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