METHOD AND APPARATUS FOR TREATING AMMONIA-CONTAINING SEWAGE

摘要

PROBLEM TO BE SOLVED: To provide a method and apparatus for removing ammonia by effectively oxidizing it to nitrogen gas without performing complicated control. SOLUTION: In this method and apparatus for treating ammonia-containing sewage, ammonia-containing sewage is supplied to the anaerobic biological reaction tank in which fine particles having ammonia adsorption capacity are suspended to be stagnated under an anaerobic microorganism present condition while adsorbing ammonia and ammonia is biologically reacted with nitrous acid to be converted to the nitrogen gas. A part of the outflow slurry in the anaerobic tank is subjected to solid-liquid separation treatment and separated water is taken out as treated water while separated sludge and the remainder of the outflow slurry of the anaerobic tank are supplied to an aerobic tank to oxidize ammoniacal nitrogen to nitrite nitrogen while suspended and fluidized. The outflow slurry of the aerobic tank is returned to the anaerobic tank.