Concentrated collecting and treating device for harmful gas of septic tanks

The utility model discloses a concentrated collecting and treating device for harmful gas of septic tanks, and belongs to the field of urban construction facilities. The device is composed of a gas delivery pipe, a gas collecting chamber, a gas collecting cylinder and a gas discharge pipe, wherein the gas delivery pipe is distributed below the ground surface between every two adjacent septic tanks, 60-100 cm away from the ground surface, and higher than the water surfaces of the insides of the tanks, and the two ends of the gas delivery pipe are respectively communicated with a septic tank; the closed cuboid cavity gas collecting chamber is arranged underground at the middle position of a connecting line of every 5-10 septic tanks, the closed cuboid cavity gas collecting cylinder is arranged in the center of the gas collecting chamber, the two ends of the gas delivery pipe between two septic tanks and adjacent to the gas collecting chamber are respectively communicated with the gas collecting cylinder, the ga