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    • 12. 发明专利
    • TREATMENT OF HARDLY DECOMPOSABLE COD COMPONENT IN WASTE WATER
    • JPH11207389A
    • 1999-08-03
    • JP2630098
    • 1998-01-26
    • EBARA CORPNOGUCHI HIROSHI
    • YONEYAMA YUTAKAHONMA YASUHIROTOKUNO MITSUHIRONOGUCHI HIROSHIUENO KOJI
    • C02F3/30
    • PROBLEM TO BE SOLVED: To provide a treatment method for waste water capable of efficiently and biologically treating ammoniacal nitrogen, organic nitrogen and hardly decomposable COD components. SOLUTION: In the method for treating the hardly decomposable COD components by biologically treating the waste water contg. BOD, COD, ammoniacal nitrogen and organic nitrogen, a first biological treatment vessel 1b under anaerobic conditions, a second biological treatment vessel 2a under aerobic conditions, the last biological treatment vessel 2b under the anaerobic conditions and the last biological treatment vessel 4a under the aerobic conditions are successively disposed. The waste water 5 is respectively dividedly introduced into the biological treatment vessels 1b, 3b under the anaerobic conditions. The treated water of the second biological treatment vessel 2a is partly circulated 7 to the first biological treatment vessel 1b and the waste water 5 is biologically treated while the waste water is successively passed through the respective treatment vessels. The first biological treatment vessels under the anaerobic condition described above and the second biological treatment vessels under the aerobic condition may be disposed in a plurality in multiple stages. The biological treatment vessels are preferably the treatment vessels provided with organism-fixed beds.