METHOD AND DEVICE FOR FLUID TREATMENT

Title:

METHOD AND DEVICE FOR FLUID TREATMENT

Document Type and Number:

WIPO Patent Application WO/2002/074703

Kind Code:

A1

Abstract:

A method for fluid treatment capable of efficiently performing a concentrating treatment of the suspension requiring the concentrating treatment in a sewage disposal plant and various types of wastewater treatment facilities, especially the sludge containing large amount of harmful odor components due to advancement of decay and difficult to receive the concentrating treatment, and also capable of remarkably reducing the odor components and carbonic acid contained in concentrated sludge and lower separated liquid by preventing odor substances from being produced in a concentration process, comprising the steps of, in a process for concentrating or dewatering the residual substances after evaporation contained in the liquid, placing the sludge under the reduced pressure of 5 to 70 kPa for less than 15 minutes so as to transfer a part of the dissolved gas components in the liquid to a gaseous phase and limit the activation of microorganisms in the liquid, performing a decompressing treatment under the reduced pressure, leading the liquid into a gravity thickening tank for gravitational concentration or leading the decompressed liquid or gravitationally concentrated sludge to an agglutination tank for coagulation, and dewatering the sludge by a dehydrator.

Inventors:

HAGINO TAKAO (JP)
HATA RYOSUKE (JP)
IRIUCHIJIMA YOSHIHARU (JP)
YOSHIDA HIDEKI (JP)

Application Number:

PCT/JP2001/008330

Publication Date:

September 26, 2002

Filing Date:

September 26, 2001

Export Citation:

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Assignee:

EBARA CORP (JP)
HAGINO TAKAO (JP)
HATA RYOSUKE (JP)
IRIUCHIJIMA YOSHIHARU (JP)
YOSHIDA HIDEKI (JP)

International Classes:

C02F11/12; C02F1/00; C02F1/20; C02F1/24; C02F1/38; C02F1/52; (IPC1-7): C02F11/12; C02F1/20; C02F1/24

Foreign References:

JP2000271596A	2000-10-03
JP2000005505A	2000-01-11
JPS59109209A	1984-06-23
JPH0527520B2	1993-04-21
JPH06304598A	1994-11-01

Other References: