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Title:
TREATMENT METHOD AND APPARATUS FOR ORGANIC WASTEWATER
Document Type and Number:
Japanese Patent JP2009101277
Kind Code:
A
Abstract:

To provide a batch treatment method and apparatus for organic wastewater which can recover phosphorus in the biological treatment of organic wastewater, and reduce the amount of generated surplus sludge.

The batch treatment method for organic wastewater comprises the first process for making phosphorus-containing wastewater flow into a biological reaction tank with activated sludge containing phosphorus generated by aeration treatment of the organic wastewater, the second process for agitating the activated sludge in the biological reaction tank and performing anaerobic operation in an anaerobic atmosphere to release phosphorus from the activated sludge, the third process for performing aerobic operation aerating the inside of the biological reaction tank after the second process, and the fourth process for performing static operation precipitating the activated sludge after the third process and then pulling out a part of supernatant liquid in the biological reaction tank to discharge it as treated water. The sludge in the biological reaction tank is pulled out in the second process and/or the third process and/or the fourth process, and a part of the sludge is liquefied. The liquefied sludge is made to flow into the first process and/or the second process.


Inventors:
TANAKA TOSHIHIRO
ARAKAWA KIYOMI
TSUNO HIROSHI
NAGAREI HIDEAKI
Application Number:
JP2007274111A
Publication Date:
May 14, 2009
Filing Date:
October 22, 2007
Export Citation:
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Assignee:
EBARA CORP
UNIV KYOTO
International Classes:
C02F3/12; B01D9/02; C02F1/58; C02F3/30; C02F11/00; C02F11/06
Attorney, Agent or Firm:
Shohei Oguri
Hironori Honda
Toshimitsu Ichikawa
Takeshi Takamatsu
Zenichi Soeda