Waste water treatment apparatus and washing method thereof
First Claim
1. A waste water treatment apparatus for separating and removing insoluble, granular material from waste water, comprising:
- a separation membrane having a feed side and a permeate side, wherein said separation membrane has a spiral-wound module structure;
a waste water inlet in fluid communication with said feed side of said separation membrane for introducing said waste water to said separation membrane;
a permeated water outlet in fluid communication with said permeate side of said separation membrane for receiving permeated water from said separation membrane, said permeated water outlet including a first valve in said permeated water outlet located downstream from said separation membrane operable between an open position where water flows out of said apparatus and a closed position for recycling said waste water from said separation membrane to said waste water inlet;
means for introducing compressed gas into said waste water inlet to form a mixture of gas and liquid in said waste water inlet for removing said insoluble, granular material deposited on said separation membrane from said separation membrane, said compressed gas introduction means comprising;
a gas source; and
a second valve operable between an open position for introducing said compressed gas into said waste water inlet and a closed position, said second valve being located between said gas source and said waste water inlet means, and said second valve being in said open position for introducing said compressed gas into said waste water inlet when said first valve is in a closed position and for recycling said waste water and said insoluble, granular material removed from said separation membrane to said waste water inlet; and
a recycle means for recycling said waste water and said insoluble, granular material and said separation membrane is washed with said mixture of gas and liquid.
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Accused Products
Abstract
A waste water treatment apparatus which can discharge cleaned waste water while separating and recovering insoluble granular components such as emulsions contained in various kinds of waste waters and various kinds of industrial waste waters, while minimizing the decrease of permeation flux by an effective separation membrane washing, and a washing method of the apparatus are disclosed. In washing the separation membrane, a passageway for water permeated through the separation membrane is intercepted, and a compressed gas is introduced into at least a waste feeding side of the separation membrane for a predetermined time, thereby flowing a gas liquid mixed liquid.
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Citations
15 Claims
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1. A waste water treatment apparatus for separating and removing insoluble, granular material from waste water, comprising:
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a separation membrane having a feed side and a permeate side, wherein said separation membrane has a spiral-wound module structure; a waste water inlet in fluid communication with said feed side of said separation membrane for introducing said waste water to said separation membrane; a permeated water outlet in fluid communication with said permeate side of said separation membrane for receiving permeated water from said separation membrane, said permeated water outlet including a first valve in said permeated water outlet located downstream from said separation membrane operable between an open position where water flows out of said apparatus and a closed position for recycling said waste water from said separation membrane to said waste water inlet; means for introducing compressed gas into said waste water inlet to form a mixture of gas and liquid in said waste water inlet for removing said insoluble, granular material deposited on said separation membrane from said separation membrane, said compressed gas introduction means comprising; a gas source; and a second valve operable between an open position for introducing said compressed gas into said waste water inlet and a closed position, said second valve being located between said gas source and said waste water inlet means, and said second valve being in said open position for introducing said compressed gas into said waste water inlet when said first valve is in a closed position and for recycling said waste water and said insoluble, granular material removed from said separation membrane to said waste water inlet; and a recycle means for recycling said waste water and said insoluble, granular material and said separation membrane is washed with said mixture of gas and liquid. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method for removing deposited, insoluble granular material from a separation membrane having a spiral-wound module structure of a waste water treatment apparatus, comprising the steps of:
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passing waste water to a feed side of said membrane treatment apparatus to produce a permeate and retentate; interrupting the flow of permeate through a permeate water outlet of said treatment apparatus, and introducing a compressed gas into a waste water inlet of said separation membrane to form a mixture of gas and liquid in said water inlet; flowing said mixture of gas and liquid into contact with said separation membrane to remove said deposited, insoluble, granular material from said separation membrane; and recycling said waste water and insoluble granular material removed from said separation back to said separation membrane; stopping the introduction of gas into said waste water inlet;
introducing compressed gas into said permeated water outlet to form a mixture of gas and liquid in said permeate water outlet; andflowing said mixture of gas and liquid in said permeated water outlet through said separation membrane from a permeate side of said separation membrane to a feed side of said separation membrane, to further remove said deposited insoluble granular material from said membrane. - View Dependent Claims (14, 15)
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Specification