Pressostatic odor control cover for slurry treatment tank with device for reducing the inner volume occupied by harmful and malodorous gases

A pressostatic odor control cover for a slurry treatment tank for a slurry, said treatment tank being delimited by a base and lateral containment walls, said pressostatic odor control cover comprising:

• a gas impermeable flexible membrane;
• a gas-tight continuous fixing system configured to fix a margin of said membrane to said tank;
• an insufflation device configured to insufflate air inside said cover, the insufflation device being connected to the membrane;
• a discharge valve configured to discharge said air out of said cover;
• and
• a diaphragm permeable to liquids and gases, the diaphragm being disposed below the membrane with respect to the base of the tank and fixed to the membrane to delimit a reduced volume of said odor control cover occupied by harmful gases and malodorous substances released from a free surface of the slurry, the diaphragm dividing the reduced volume subtended by the pressostatic control cover into two separate chambers including
• an upper chamber delimited by the diaphragm and a top of the flexible membrane, and
• a lower chamber delimited by the diaphragm, a lower portion of the flexible membrane with respect to the base of the tank, and the free surface of the slurry,
• wherein said air insufflation device is connected to said membrane above said diaphragm with respect to the base of the tank, the air insufflation device being configured to insufflate new air in the upper chamber to maintain the upper chamber at a higher pressure than a pressure in the lower chamber, thereby preventing a passage of polluted air from the lower chamber to the upper chamber, and
• said discharge valve is connected to said membrane below said diaphragm with respect to the base of the tank.