US Patent No: 5,651,889

Number of patents in Portfolio can not be more than 2000

Sludge treatment membrane apparatus

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Abstract

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A membrane apparatus includes a bubble supplying portion for supplying micro bubbles which is provided at a location in the vicinity of the entrance of a flow passage for raw liquid. Thus, the growth of a gel layer on a membrane surface can be prevented, and a large filtering amount can be maintained while preventing sludge from blocking the membrane. Moreover, since bubbles uniformly pass through the inter-membrane passages, sludge blocking can be evenly prevented over the entire surface of the membrane. When a flat membrane is used as the filtering membrane, there is provided an advantage of reducing the frequency of work for disassembling the frame and cleaning the membranes. A membrane treatment apparatus includes the membrane apparatus, an aeration apparatus, a circulating tank, and a filtrate pump. Since the relative density of raw liquid which has received bubbles in the membrane apparatus decreases, a difference in density is produced between that raw liquid and raw liquid which is newly supplied from the circulating tank to the passage and which contain no bubbles. Since this difference in density causes a flow of raw liquid, no power is needed for circulation. Accordingly, a circulating pump can be omitted so as to reduce costs including initial cost and operation cost.

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Patent Owner(s)

Patent OwnerAddressTotal Patents
MITSUI CHEMICALS, INC.TOKYO2763

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Hashimoto, Tadaaki Sakura, JP 3 16
Irie, Kouji Ichikawa, JP 4 24
Shirage, Hirokazu Chofu, JP 1 13
Wataya, Sakae Urayasu, JP 1 13
Yamamoto, Kimio Ichihara, JP 3 32

Cited Art Landscape

Patent Info (Count) # Cites Year
 
KUBOTA CORPORATION (3)
5,192,456 Apparatus for treating activated sludge and method of cleaning it 109 1992
5,437,787 Adsorption/reaction equipment 3 1993
5,482,625 Filtration membrane module 45 1994
 
BRITISH NUCLEAR FUELS PLC (1)
4,832,841 Liquid treatment apparatus 10 1987

Patent Citation Ranking

Forward Cite Landscape

Patent Info (Count) # Cites Year
 
CH2M HILL, INC. (5)
6,517,723 Method and apparatus for treating wastewater using membrane filters 52 2000
6,863,818 Method and apparatus for treating wastewater using membrane filters 46 2003
6,946,073 Method for treating wastewater in a membrane bioreactor to produce a low phosphorus effluent 48 2003
8,721,887 Method and system for treating wastewater 0 2010
8,105,490 Low phosphorus water treatment systems 0 2011
 
3M INNOVATIVE PROPERTIES COMPANY (2)
6,986,428 Fluid separation membrane module 12 2003
7,279,215 Membrane modules and integrated membrane cassettes 18 2003
 
ALFA LAVAL ASHBROOK SIMON-HARTLEY INC. (2)
7,279,100 Methods and apparatus for treating wastewater employing a high rate clarifier and a membrane 30 2005
7,410,584 Methods and apparatus for treating wastewater employing a high rate clarifier and a membrane 22 2007
 
Chiyoda Kohan Co., Ltd. (1)
6,197,203 Filtration method and filtration apparatus 5 1999
 
Minnesota Mining and Manufacturing Company (1)
6,514,412 Microstructured separation device 19 1998
 
MITSUI CHEMICALS, INC. (1)
6,224,766 Membrane treatment method and membrane treatment apparatus 3 1999
 
OVIVO LUXEMBOURG S.A.R.L. (1)
8,308,939 Efficient arrangement of membrane bioreactors 0 2009