A. Kvic Model (Floating Drum Model)
It consists of a deep well shaped underground digester connected by inlet and outlet pipes . a mild steel gas storage drum, inverted over the slurry goes up and down around a guide pipe corresponding to the accumulation and withdrawal of gas.


Benefits

Capacity to maintain steady pressure of biogas by the movement of gas holder Inbuilt provision for scum breaking Volume of gas is known just by observing the position of the drum

B. Fixed Dome
The main feature of this design is that the digester and gas holder are opart of composite unit made of brick masonry. It has a cylindrical digester with dome shaped roof and large inlet and outlet tank.


Advantages

The plant is cheaper than the floating drum plants by 20-30%

C. Deenbandhu Model ( Fixed Dome Model)
It consists of a deep well shaped underground digester connected by inlet and outlet pipes . a mild steel gas storage drum, inverted over the slurry goes up and down around a guide pipe corresponding to the accumulation and withdrawal of gas.

Advantages

The deenbandhu type costs about 20 % less than that that of janata model and 40 % less than the floating drum type of same size capacities

D. UASB UP-FLOW ANAEROBIC SLUDE BLANKET REACOR
UASB UP-FLOW ANAEROBIC SLUDE BLANKET REACOR is appropriate and economical process this type is used to treat waste water and for the production of biogas. The upward motion of released gas bubbles cause hydraulic turbulence that provides reactor mixing without any mechanical parts at the top of the reactor, the water phase is separated from sludge solids and gas in a three phase separator ( also known the gas-liquid –solids separator i.e. GLSS) .