Sludge drying and waste gas purifying system for municipal sewage

The utility model discloses a sludge drying and waste gas purifying system for municipal sewage. The sludge drying and waste gas purifying system comprises a coarse screen filter tank, a fine screen grit chamber, a sludge dewatering device, a waste gas collecting device and a waste gas purifying device, the coarse screen filter tank is provided with a water inlet well, a water collecting tank and a coarse screen filter; the fine grid grit chamber is provided with a high-level water well, a water inlet conveying channel, a fine grid filter and a rotational flow grit chamber; the waste gas collecting device comprises a gas suction pipe and a first isolation hood; the fine grid filter is erected above the water inlet conveying channel, and the sludge output end of the rotational flow grit chamber is communicated with the sludge dewatering device to output wet sludge; air suction pipes are installed below the first isolation hoods to suck waste gas, and the output ends of the air suction pipes communicate with th