Liquid treatment method and apparatus

摘要: An improved method and apparatus for treating liquor containing biodegradable wastes wherein the is first delivered to a quiescent primary settling zone then an aeration zone. The aerated downwardly through column of submerged fixed media having high surface area volume ratio so that aerobic microorganisms can grow on their surface. recirculated media, withdrawn from unit after treatment. A portion top recycled back into denitrify nitrate rich by deoxygenating dissolved nitrates equalize BOD load in secondary treatment