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:
Jul. 14, 2009
Filed:
Sep. 13, 2007
Toyoshi Yamaguchi, Kawasaki, JP;
Kunio Miyazawa, Sakura, JP;
Yasuki Yao, Tokyo, JP;
Toshiaki Tsubone, Tokyo, JP;
Jun Miyata, Yokohama, JP;
Yoshinori Yomura, Kawasaki, JP;
Toyoshi Yamaguchi, Kawasaki, JP;
Kunio Miyazawa, Sakura, JP;
Yasuki Yao, Tokyo, JP;
Toshiaki Tsubone, Tokyo, JP;
Jun Miyata, Yokohama, JP;
Yoshinori Yomura, Kawasaki, JP;
JFE Engineering Corporation, Tokyo, JP;
Abstract
A method and an apparatus for treating organic wastewater and sludge which remarkably reduce the generated amount of sludge at a much lower running cost, and which reduce the size and the capacity of the solubilization tank. The method and apparatus for treating sludge employs a biological treatment system, wherein a biological treatment of wastewater is carried out, and a solid-liquid separation unit for separating a solid from a liquid in the wastewater after the biological treatment, to obtain a treated wastewater and a sludge. The apparatus has a means for obtaining a withdrawn sludge from a part of the sludge and an alkali-treatment tank, wherein an alkali-treatment of the withdrawn sludge is carried out. The apparatus also has a biological solubilization tank which solubilizes the sludge after the alkali-treatment under an anaerobic, anoxic or microaerophilic condition, and a means for recycling the solubilized sludge to the biological treatment system.