TOWER-TYPE REACTOR FOR SEWAGE TREATMENT Russian patent published in 1997 - IPC

FIELD: sewage treatment for removal of hard-to-oxidize organic matter, environmental control. SUBSTANCE: proposed tower-type bioreactor comprises vertical body having expanded upper portion and filled with fluidized packing bed. Lower portion of reactor body accommodates peripheral chamber filled with granular packing. Upper portion of reactor body houses peripheral cylindrical annular settler having conically shaped bottom and slit for passage of sludge. Cylindrical portion of settler forms inner mouth filled with stationary fibrous packing disposed under settler. Upper portion of reactor further comprises device for removing excess sludge. This device is made in form of funnel communicating with conduit for removing excess activated sludge and arranged centrally in expanded portion of reactor body. Lower portion of reactor body is made in form of truncated cone and houses conical water distributor and conical baffle plate arranged beneath slit for passage of sludge in settler. Latter is provided in its upper portion with stationary fibrous packing, with semisubmerged coaxial cylindrical partition, with cover through which pass connection pipes for removal of biogas to boiler and to carbonator, and with collector adapted to collect water after settling treatment. Inner mouth of bioreactor has tightly fitting lid and openings for water by-pass. Peripheral water clarification chamber is filled with granular packing, is arranged outside of reactor body, and has water distributing pocket communicating with conduit for removing water after settling treatment. System for washing granular packing is made in form of pair-wise arranged semicircular conduits having connection pipes disposed in upper and lower portions of water clarification chamber. Proposed bioreactor makes it possible to reduce amount of excess activated sludge, to increase specific bioreactor productivity, to improve its mass exchange properties. EFFECT: greater degree of sewage purification from organic and suspended matter; considerably expanded range of effective uses due to versatility of proposed bioreactor. 2 cl, 1 dwg