SYSTEM FOR TREATMENT OF ORGANIC WASTE WATER CONTAINING NITROGEN

摘要

PROBLEM TO BE SOLVED: To provide a system for treatment of organic waste water containing nitrogen, which can be made compact by rationalizing the system, is high in a nitrogen removal efficiency and can surely remove nitrogen.

SOLUTION: This system is provided with: a suspended sludge-used biological treatment apparatus 11 for biologically treating organic waste water 20 containing nitrogen with activated sludge of a suspended state; a membrane separation apparatus 12 for subjecting the biologically treated liquid to be discharged from the suspended sludge-used biological treatment apparatus to membrane separation to obtain a separated liquid and separated sludge; and an anaerobic microbe fixed bed apparatus 13 for biologically treating the separated liquid by the action of a microbe fixed on a support under an anaerobic condition. A step of removing a nitrogen component contained in the separated liquid is carried out mainly in the anaerobic microbe fixed bed apparatus 13. A submerged membrane separation system is suitably adopted in the membrane separation apparatus 12 so that an oxygen-containing diffusion gas is removed and a nitrification step is also carried out in the membrane separation apparatus 12.

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