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AssigneeZenon Environmental Inc.
InventorsPierre Lucien Cote, Arnold Frederic Janson, Steven Kristian Pedersen, Steven Ian Low
Estimating the term…
Limitation of the number of cassettes in an assembly currently used for the production of permeate is obviated by grouping plural cassettes into racks one or more of which may be isolated while permeate production from the remaining racks is uninterrupted. Ancillary functions such as back-pulsing, chemical cleaning and testing for defects in membranes (“integrity testing”) in one or more racks may proceed while production of permeate continues. The number of racks in a bank is determined by the period of the overall filtration cycle, typically 15 min, in which filtration period the ancillary period is a minor portion, typically 30 sec. The racks make it possible to use automatic on/off valves which open and close quicker than larger ones. The resulting saving in time, energy, and equipment costs, which when back-pulsing with permeate is surprisingly economical, is even greater when a chemical cleaning solution is to be used. In addition, the saving in cost of equipment and avoiding the wear and tear of pumps which are intermittently stopped and started, produces unexpected economic benefits. For even greater savings in operating costs, a bank of cassettes, or a bank of racks may be operated with a “gravity flow” system.
In a large plant comprising a bank of multiple cassettes for filtering a contaminated substrate, immersed in said substrate, and in open fluid communication with each other, each cassette comprising a multiplicity of membrane modules connected for operation in parallel in the cassette, a method comprising,
In a large plant a bank comprising a bank of racks for filtering a contaminated substrate, immersed in said substrate, and in open fluid commuication with each other, each rack comprising a multiplicity of membrane modules connected for operation in parallel in cassettes, a method comprising,
A large filtration plant comprising a bank of multiple cassettes for the production of permeate flowing immersed in a reservoir of substrate to be filtered, comprising,
Dependencies are inferred from the claim text.