METHOD FOR EVALUATING DENITRIFICATION STRENGTH OF SLUDGE

WIPO Patent Application WO/2012/008226

A1

[Problem] To provide a method for controlling the denitrification strength of a liquid mixture containing activated sludge in a process of treating the activated sludge or biological denitrification. [Solution] A precipitation test method using cylinders, which comprises, when the ratio of the liquid face level of a liquid mixture containing activated sludge in a cylinder to the liquid face level of a sludge layer after allowing the same to stand is referred to as SV, comparing SV2 with SV1 [wherein SV1 represents an SV value measured after a shorter standing time; and SV2 represents an SV value measured after a longer standing time] to thereby evaluate the denitrification level of the liquid mixture containing activated sludge. A method which comprises preliminarily adding a BOD solution to a liquid mixture containing activated sludge in a cylinder, which is to be allowed to stand over a longer time, and mixing therewith followed by standing, then measuring SV2s and comparing the SV2s with SV1 to thereby evaluate the denitrification strength according to the amount of nitrate nitrogen in the liquid mixture containing activated sludge.

OGAWA TAKAO (JP)

PCT/JP2011/061931

January 19, 2012

May 25, 2011

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OGAWA ENVIRONMENTAL RES INST INC (JP)
OGAWA TAKAO (JP)

C02F3/34; C02F1/00; C02F3/12

JP2001255319A	2001-09-21
JP2005238089A	2005-09-08
JP2006205111A	2006-08-10
JPS5845318B2	1983-10-08
JPH11183365A	1999-07-09
JPH10194724A	1998-07-28
JP2007319787A	2007-12-13

"Haisui no Kassei Odei Shori, revised new edition, Koseisha Koseikaku edition", 15 April 1986, article MAKIO NAKASHIO, pages: 255

SUGIHARA, Tetsuo (JP)
Tetsuro Sugihara (JP)

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