The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 01, 2011
Filed:
Apr. 07, 2006
Shigeki Fujishima, Tokyo, JP;
Shigeki Fujishima, Tokyo, JP;
Kurita Water Industries Ltd., Tokyo, JP;
Abstract
A biological treatment method and device for organic wastewater, whereby the amount of minute organisms which reduce the amount of excess sludge and held within an activated sludge tank can be stabilized so that the treatment can be stabilized, are provided. Substrates for growing dispersed bacteria and/or dispersed bacteria are supplied to a sludge treatment tankwhich reduces the sludge by the minute organisms, so that the minute organisms grow stably and reduce the sludge. Specifically, a first and a second biological treatment step are conducted respectively in a first activated sludge tankand a second biological treatment tank. The sludge included in effluent which flows from the biological steps is separated in a sedimentation tank. The generated sludge obtained is supplied to the sludge treatment tank. The water to be treated which is bypassed via a bypass pathis introduced to a sludge treatment tankas substrates to be assimilated by bacteria so that dispersed bacteria are made to grow in the sludge treatment tankand the minute organisms are held stably in the sludge treatment tankto promote the reduction of sludge.