Title:
TEST METHOD FOR WASTEWATER TREATMENT
Document Type and Number:
Japanese Patent JP3301428
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a test method for controlling the operation state of an activated sludge method and a biological denitrification method.
SOLUTION: The general mass transfer coefficient of the oxygen dissolving speed of an aeration device at the time of aeration of an activated sludge mixed waste liquid is set to Kabs and the waste liquid is sufficiently aerated to obtain a value at a point of time when the concentration of dissolved oxygen becomes almost constant and the area S1 which is surrounded by a dissolved oxygen concentration change curve, which is obtained when the waste liquid to which a set amount of an easily decomposable BOD substance is added is aerated until the concentration D01 of dissolved oxygen at the start time of aeration becomes the obtained value, and an imaginary dissolved oxygen concentration change curve, which is calculated from a formula when aeration is started from the initial value D01 at the start time of aeration, is multiplied by Kabs to obtain a value BOD1 while the mixed liquid is brought to an anaerobic state for a definite time after a set amount of the easily decomposable BOD substance is added and, thereafter, aeration is started from the concentration D02 of dissolved oxygen at the start time of aeration to obtain a dissolved oxygen change curve and a value BOD2 is calculated from the formula corresponding to the initial value D02 by the same technique and, from the difference between BOD1 and BOD2, the concentration of nitrite ions or nitrite ions in the mixed waste liquid and the reaction quantity of denitrification reaction are measured.
Inventors:
Takao Ogawa
Application Number:
JP2000065799A
Publication Date:
July 15, 2002
Filing Date:
March 09, 2000
Export Citation:
Assignee:
Ogawa Environmental Research Institute Co., Ltd.
International Classes:
G01N33/18; C02F1/00; C02F3/12; C12M1/00; C12M1/34; (IPC1-7): G01N33/18; C02F3/12
Domestic Patent References:
| JP11160305A | ||||
| JP11290883A | ||||
| JP1028992A | ||||
| JP452556A | ||||
| JP52105663A |
Previous Patent: METHOD FOR TESTING PROCESSING WASTEWATER
Next Patent: PRIMER COMPOSITION FOR PLASTIC LENS
Next Patent: PRIMER COMPOSITION FOR PLASTIC LENS