| 摘要 |
A multistage wastewater treatment apparatus is provided to maximize the biofilm forming ratio of a contact media by allowing agitation units to rotate organic waste in a direction, and prevent an oligotrophic state of microorganisms due to inflow disconnection of wastewater by enabling an inner settling tank to transfer and return the organic waste. A multistage wastewater treatment apparatus comprises: an anaerobic tank(10) into which wastewater flows through an inflow path(12); a buffer aerobic tank(20) which is connected to the anaerobic tank, and in which a contact media(22), a flow rate adjusting aerator(24), an agitation unit(26) are disposed to perform nitrification, denitrification, and the removal of ammonia; a multistage anaerobic tank(30) which is connected to the buffer aerobic tank, and in which a contact filter media(32), a flow rate adjusting aerator(34), and an agitation unit(36) are disposed to perform nitrification and phosphorous uptake; an inner settling tank(40) which is connected to the multistage anaerobic tank, and in which solid and liquid are separated from the organic waste; a sludge tank(50) which is connected to the inner settling tank, and into which the organic waste settled by the solid-liquid separation; and a treated water tan(60) which is connected to the inner settling tank, into which supernatant separated by the solid-liquid separation flows, and which injects chlorine into the supernatant to discharge the chlorine-injected supernatant to the outside. |
