MEASURING METHOD OF OXYGEN UTILIZATION RATE IN AERATION TANK, AND MEASURING APPARATUS THEREFOR

PROBLEM TO BE SOLVED: To improve the precision of measurement without requiring a large-scale measuring apparatus such as by a gas balance method. SOLUTION: Oxygen-saturated supernatant liquid c and oxygen-free supernatant liquid d are fed to a closed rr measuring device 4 filled with mixture liquid...

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1. Verfasser:	MATSUBARA KIWAMU
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 INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES MEASURING METALLURGY PHYSICS TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE TESTING TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To improve the precision of measurement without requiring a large-scale measuring apparatus such as by a gas balance method. SOLUTION: Oxygen-saturated supernatant liquid c and oxygen-free supernatant liquid d are fed to a closed rr measuring device 4 filled with mixture liquid (a) of an aeration tank 11 while inverter-controlling the flow rates of the supernatant liquids so as to maintain a constant relation among the flow rates of the oxygen-saturated supernatant liquid c, the oxygen-free supernatant liquid d, and oxygen-free sludge e and make DO in the closed rr measuring device 4 coincide with DO in the aeration tank 11. An oxygen utilization rate rr is determined from the DO and integrated flow rate of the oxygen-saturated supernatant liquid c, the integrated flow rates of the oxygen-free supernatant liquid d and the oxygen-free sludge e, and a measuring time after the coincidence of the DO in the closed rr measuring device 4 with the DO in the aeration tank 11. COPYRIGHT: (C)2005,JPO&NCIPI