TREATMENT EQUIPMENT OF LIVESTOCK WASTEWATER OF SOLID-LIQUID SEPARATION TYPE

摘要

PURPOSE: A treatment equipment of livestock wastewater is provided, which has a bottomless cylindrical settling tank(36) at the central top part in the aeration tank(34), and in which settled sludge at the bottom of the bottomless settling tank is recycled to the aeration tank(34) naturally by agitation of water swirling caused by air diffusion through air spargers(38) at the bottom of the tank(34), thereby preventing the rottenness of the sludge and diminishing the number of works for removing sludge to 2-4 times an year. CONSTITUTION: The system comprises the following steps: (i) a vacuum screen(20) in which dregs and solid in the effluent water from a raw water tank(10) are removed and fed to a dry bed(40); (ii) a reaction tank(30) that has a symmetry three dimensional sludge separator(35) at center bottom, air spargers at the bottom, a bottomless settling tank(36) at the center top and an aeration tank(34) in it, in which water is purified by the activated sludge, the purified water is fed to the cylindrical bottomless settling tank(36) and the settled sludge is recycled to the aeration tank by agitation caused by water swirling, the settled sludge at the bottom of the aeration tank(34) being transferred to the drying bed(40) after a time of 3-6 months is elapsed; (iii) a discharge line(32) set at top of the settling tank(36) for discharging the treated water.