Patent ID: 6375838
Filing Date: 2002-04-23
Classification: C02F,C12M,Y02E

Abstract:
A sealed tank containing a liquid effluent and a methane fermentation biogas, comprising: a concrete footing, a steel or concrete shell ring and a sealed and corrosion-resistant dome including an inner membrane delimiting a sealed chamber containing the biogas corrosive environment, and an outer membrane enveloping the inner membrane and which, when pressurized, applies a given pressure to the volume of biogas or of corrosive environment contained in said chamber, said inner membrane extended downwardly by a skirt, the lower part of which is submerged below the level of the liquid effluent so as to seal the chamber above said level, the skirt being fixed, around its entire periphery, below the level of liquid effluent, to the interior wall of the shell ring by a seal pressed against the wall, using flat stainless steel bars which are fixed into the wall.