TREATMENT OF NITROGEN AND PHOSPHORUS IN SEWAGE

PURPOSE:To simultaneously remove nitrogen and phosphorus by preparing two aeration tanks at the minimum and controlling supply of air so that an anaerobic stage and an aerobic stage are performed respectively at the prescribed ORP value in a first tank and also the whole stage is regulated to the pr...

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Bibliographische Detailangaben
Hauptverfasser:	TSUMURA KAZUYUKI, YAMAMOTO KOJI
Format:	Patent
Sprache:	eng
Schlagworte:	CHEMISTRY CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATERTREATMENT OR WASTE MANAGEMENT GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS METALLURGY TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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Beschreibung
Zusammenfassung:	PURPOSE:To simultaneously remove nitrogen and phosphorus by preparing two aeration tanks at the minimum and controlling supply of air so that an anaerobic stage and an aerobic stage are performed respectively at the prescribed ORP value in a first tank and also the whole stage is regulated to the prescribed ORP value in a second tank in activated sludge treatment by intermittent aeration. CONSTITUTION:An aeration tank 2 is constituted of a first tank 2a into which sewage is introduced and a second tank 2b from which sewage is discharged to a precipitation tank 3. ORP value of the respective tanks 2a, 2b is measured by ORP meters 6a, 6b. An aeration stage and an anaeration stage are controlled by a timer. In the meantime, the feed rate of air is controlled so that ORP value in an anaerobic stage is set to