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Title:
廃水処理システム
Document Type and Number:
Japanese Patent JP4446104
Kind Code:
B2
Abstract:

To provide a constitution of a wastewater treatment system which suppresses the generation of excessive sludge to the utmost and carries out sludge decomposition efficiently.

The wastewater treatment system is provided with: a flow quantity adjustment tank 1 which adjusts the flow quantity of wastewater which includes organic substances flowing in; an aeration tank 2 which carries out decomposition treatment of organic substances against the wastewater sent from the flow quantity adjustment tank 1 while activating microorganisms by aeration; a sedimentation tank 3 which settles and separates the treatment water sent from the aeration tank 2; and a sludge digesting tank 4 which decomposes the settled sludge sent from the sedimentation tank 3. In the wastewater treatment system that converts the supernatant water to the aeration tank 2 from the decomposition, the concentration of the dissolved oxygen in the aeration tank 2 is adjusted in the range of about 0.01 to about 0.6 mg/L, preferably, about 0.2 to about 0.5 mg/L in the wastewater treatment system. Thereby, the problem is solved from the activation of facultative anaerobic bacteria.

COPYRIGHT: (C)2009,JPO&INPIT


Inventors:
Kazuo Yamaoka
Application Number:
JP2007336681A
Publication Date:
April 07, 2010
Filing Date:
December 27, 2007
Export Citation:
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Assignee:
Wakao Electric Co., Ltd.
Claris Environment Co., Ltd.
International Classes:
C02F3/12; C02F3/30; C02F3/34
Domestic Patent References:
JP2008284428A
JP2002361279A
JP2004188281A
JP2007117790A
JP63294993A
JP11028493A
JP7251194A
JP6126293A
JP9122670A
JP11077085A
JP5277305A
JP2000167583A
JP2004248618A
JP2009057235A
JP59032998A
JP61178094A
JP2258099A
JP3077696A
JP4061999A
JP11047787A
JP2002018469A
JP2006110462A
JP2008200637A
Attorney, Agent or Firm:
Shigumi Nishino