ONSITE SYSTEM FOR INDIVIDUAL RESIDENCES AND OTHER COMMUNITY FACILITIES IN UNSEWERED AREAS ADAPTING AEROBIC PROCESS

摘要

PURPOSE: An onsite system for individual residences and other community facilities in unsewered areas adapting aerobic process is provided to prevent shortening of aerobic microorganisms due to excessive aeration and formation of sediments on the bottom of the contact aeration tank by forming a screw type surface aeration means in a contact aeration tank. CONSTITUTION: The aerobic wastewater treatment method comprises the processes of collecting the wastewater in a flow equalization tank(4) in the state that inorganic and organic materials are removed by passing wastewater through a grit chamber and an initial screen tank(1); first treating organic materials of the collected wastewater in an anaerobic treatment tank using anaerobes; second treating residual organic materials in a contact aeration tank(5) using aerobes; and discharging the treated water by passing the resulting wastewater through an advanced wastewater treatment after settling the treated organic materials in a clarifier(6), wherein one screw type surface aeration means inside the contact aeration tank(5) is repeatedly ascended or descended by a screw ascent and descent device according to a certain cycle, and aeration and agitation are sequentially performed.