A container for gas in which the pressure is maintained constant when the amount, therein contained, changes, specifically suited for accumulating biogas generated from waste waters and biological sludges

摘要

An outer convering membrane has the form of a convex surface whereby the biogas source is covered so as to form an insulated from the outside space or canopy and a flexible and impremeable membrane located at the inside of the space. It is therefore divided in two separated chambers or volumns of which the lower one is occupied by biogas and the upper one comprises an air chamber or lung from which air taken off or into which air is supplied from the outside to comply with the steps of collecting, stocking and taking off the biogas at a constant pressure. The two flexible membranes are united to one another along a closed line whereby the air chamber is formed which, at its turn is united to the biogas source along a closed line whereby the lower chamber is formed wherein the gas is collected.