Immersed-Membrane Water Treating Filtering Device Comprising Means Preventing Filterable Medium Backflowing to Filter Cleaning Gas Injecting Means
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Abstract
A water treating system is provided with a membrane chamber having one or more membranes disposed therein for filtering water. To periodically clean the membranes, there is provided a series of cleaning fluid inlets that permit a cleaning fluid, such as a gas, to be injected through the inlets into the membrane chamber which results in the cleaning fluid cleaning the membranes therein. The cleaning fluid inlets are normally closed and are adapted to open in response to the pressure of the cleaning fluid reaching a certain pressure level.
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Citations
68 Claims
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1-35. -35. (canceled)
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36. A filter system for treating water, comprising:
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a. one or more membranes disposed in a membrane chamber and adapted to be immersed in a filterable medium therein;
b. one or more cleaning fluid inlets for permitting a membrane cleaning fluid to be injected into the membrane chamber for cleaning the one or more membranes; and
c. the cleaning fluid inlet being normally closed, but which opens and permits cleaning fluid to flow therethrough in response to the cleaning fluid assuming a predetermined pressure level. - View Dependent Claims (37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66)
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67. A method of treating water comprising:
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a. directing the water into a membrane chamber having one or more immersed membranes disposed therein and filtering the water;
b. from time to time, cleaning the membranes by injecting a cleaning fluid through one or more normally closed cleaning fluid inlets and into the membrane chamber wherein the injected cleaning fluid, through agitation or turbulence, causes the membrane filters to be at least partially cleaned; and
c. the step of injecting the cleaning fluid including pressurizing the cleaning fluid such that the pressure of the cleaning fluid is sufficient to open the normally closed cleaning fluid inlets so as to cause the cleaning fluid to pass through the cleaning fluid inlets into the membrane chamber having the membrane filters therein. - View Dependent Claims (68)
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Specification