Aeration method
First Claim
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1. A method of cleaning outer surfaces of membranes for use in filtering a liquid, the method comprising the steps of:
- providing a bundle of porous hollow fiber membranes mounted between upper and lower potting sleeves and immersed in the liquid; and
directing gas bubbles toward the bundle from around a circumference of the bundle transversely of a vertical axis of the bundle with one or more gas feeding rings fitted around the circumference of the bundle at locations spaced from the potting sleeves, the ring comprising a tube having an axis extending circumferentially around the bundle and having spaced openings formed to allow gas to be fed inwardly toward the bundle.
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Abstract
A method and filtration module (5) for providing gas bubbles within an array of vertically disposed porous hollow membranes (6) to clean the outer surfaces of said membranes (6) when the array is immersed in a liquid by feeding (10) the gas bubbles into the array transversely of the vertical axis of the array. In one preferred form, the gas bubbles are retained within the array using a sleeve (11) surrounding the array (6) at least along part of its length.
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Citations
17 Claims
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1. A method of cleaning outer surfaces of membranes for use in filtering a liquid, the method comprising the steps of:
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providing a bundle of porous hollow fiber membranes mounted between upper and lower potting sleeves and immersed in the liquid; and directing gas bubbles toward the bundle from around a circumference of the bundle transversely of a vertical axis of the bundle with one or more gas feeding rings fitted around the circumference of the bundle at locations spaced from the potting sleeves, the ring comprising a tube having an axis extending circumferentially around the bundle and having spaced openings formed to allow gas to be fed inwardly toward the bundle. - View Dependent Claims (2, 3, 4)
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- 5. A membrane filtration module comprising a bundle of porous hollow fiber membranes mounted in a lower potting sleeve and one or more gas feeding rings fitted around a circumference of the bundle at locations spaced from the lower potting sleeve, the ring comprising a tube having an axis extending circumferentially around the bundle and having spaced openings formed to allow gas to be fed inwardly toward the bundle.
Specification