A fixed-dome plant comprises of a closed, dome-shaped digester with an immovable, rigid gas-holder and a displacement pit, also named ‘compensation tank’. The gas is stored in the upper part of the digester. When gas production commences, the slurry is displaced into the compensating tank. Gas pressure increases with the volume of gas stored, i.e. with the height difference between the two slurry levels. If there is little gas in the gas-holder, the gas pressure is low.
Infatable Bio-digesters consists of a heat-sealed plastic or rubber bag (balloon), combining digester and gas-holder. The gas is stored in the upper part of the balloon. The inlet and outlet are attached directly to the skin of the balloon.These types of digesters are portable hence the ease of movements.
Corrosive compounds such as H2S and NH3 are unavoidable by-products of the biogas production process. All equipment in the digester tanks comes into contact with these corrosive elements. Unless corrosion-resistant materials are used, damage to equipment will occur.
It is essential to avoid breakdowns, as restarting a digester is a long and delicate operation.
Properly specified stainless steel can withstand corrosive environments in a biogas plant. This is why stainless steel is typically utilised in:
- Digesters
- Pumps and valves
- Agitators
- Pipes and fittings
- Purification applications.
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To guarantee smooth operation and complete safety of the Biogas plant, frequent or periodic inspection has to be done. This will ensure efficient production of Biogas and Organic manure daily and avoid any leakage of liquid or gaseous substances from the plant.