TREATING EQUIPMENT FOR EXCRETION-SERIES SEWAGE

摘要

PURPOSE:To simplify the title equipment by adding a high molecular flocculating agent to activated sludge slurry fed from a first biological treatment tank in which excretion-series sewage is biologically subjected to nitrating and denitrifying treatment and separating produced floc and sending the separated liquid to a second biological treatment tank. CONSTITUTION:Excretion 1 is agitated by a pump 3 and air 5 due to an ejector 4 in a biological treatment tank 2 and subjected to nitrating and denitrifying treatment without being diluted and thereafter large parts of activated sludge slurry 6 are introduced into a second biological treatment tank 7. Further one part 18 of activated sludge slurry is drawn out and a high molecular flocculating agent is injected from a chemical injector 19 to form floc in an agitation tank 20 and floc 22 is circulated to the tank 2 by a screen separator 21 and permeated liquid 23 is sent to a biological treatment tank 7. Waste water 8 is introduced into the tank 7 and aerobic treatment and anaerobic treatment are alternately performed by air 9 and outflow activated sludge slurry 10 is passed through a storage tank 11, a UF membrane separator 15 and an activated carbon adsorber 24 and discharged. By such a way, the need for the UF membrane separator for returning activated sludge is eliminated and the equipment can be simplified.