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Technologies for Economic Development

BIOGAS as DEcentralized WAstewater Treatment System (DEWATS)

A solution for sanitation, wastewater treatment, and renewable energy


On-site wastewater treatment combined with biogas production, which could be used as cooking fuel - this reliable technology stands in the center of TED’s portfolio because:

The three-step-process happens in a biogas digester, ananaerobic baffled reactor (ABR) and a planted gravel filter (PGF). Together with a modern, hygienic and safe Amalooloo-Toilet with integrated hand washing device, TED offers a complete technical set for advanced and environmentally sound on-site sanitation.

In short: Biogas Technology is a method of changing organic waste into gas and fertilizer by anaerobic process, i.e. a process without oxygen.

Who are the target groups?

Besides organic waste, water is required for the operation of the digester; this could be domestic wastewater or in the case of a farm, urine from the animals could be used. At a modern house with bathroom and kitchen with wastewater pipes, the Biogas/DEWATS could be installed as replacement of a septic tank, conservancy tank or soak away pit or be combined with any of these. Physical mixing of water is normally not required as in TED's type of biogas digester as first wastewater treatment step, water is mixed with organic matter automatically by inflow and through ongoing biogas production in the digester. The solids remain in the Biogas Digester and are fully exploited and converted by natural bacteria into liquid and gas; the water that overflows into the Anaerobic Baffled Reactor is partially treated, but should not yet be used for irrigation; to clean the water up to safe hygienic levels, a planted gravel filter (root treatment) is required, where aerobic treatment takes place supported by the roots of the plants that transport oxygen into the water, which is then discharged in small quantities. The type of biogas digester introduced by TED can deal with all types of organic waste, as long as the internal digester temperature does not fall much and for long time below 13°C.

Material that could be used to feed the digester

Is biogas dangerous?

Biogas is weaker than bottled gas and is therefore less dangerous.

What are the benefits of biogas?

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