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Title:
METHOD AND APPARATUS FOR BIOLOGICALLY TREATING ORGANIC WASTE LIQUID
Document Type and Number:
Japanese Patent JP2005103486
Kind Code:
A
Abstract:

To provide a technique capable of more largely reducing the production amount of sludge to be disposed of than a method for returning sludge to an aerobic biological treatment method after anaerobic digestion, in the aerobic biological treatment of organic wastewater.

In the biological treatment of organic wastewater, organic sludge produced in an aerobic biological treatment process and/or organic sludge produced in a first sedimentation process is concentrated to form concentrated sludge and, after the concentrated sludge is subjected to solubilization treatment by ultrasonic treatment, it is decomposed in an anaerobic digestion process and a part or the whole of digested sludge issued from the anaerobic digestion process is returned to the aerobic biological treatment process or the concentrated sludge is decomposed in the anaerobic digestion process and a part of the digested sludge issued from the anaerobic digestion process is solubilized by ultrasonic treatment to be returned to the anaerobic digestion process and a part or the whole of the residual digested sludge is returned to the aerobic biological treatment process, and residual digested sludge is disposed.


Inventors:
MORI TAKASHI
MIYAKE HARUO
YAMASHITA SHIGEKI
TANAKA TOSHIHIRO
OTSU TAKESHI
Application Number:
JP2003343159A
Publication Date:
April 21, 2005
Filing Date:
October 01, 2003
Export Citation:
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Assignee:
JAPAN SEWAGE WORKS AGENCY
EBARA CORP
International Classes:
C02F3/12; C02F11/00; C02F11/04; (IPC1-7): C02F3/12; C02F11/00; C02F11/04
Attorney, Agent or Firm:
Shohei Oguri
Hironori Honda
Toshimitsu Ichikawa
Takeshi Takamatsu
Yuriko Hamada
Zenichi Soeda