MULTI-STAGE IMMERSION-TYPE MEMBRANE SEPARATION DEVICE AND MEMBRANE SEPARATION METHOD
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United States of America Patent
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Dec 20, 2018
app pub date -
Aug 22, 2018
filing date -
Aug 22, 2018
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The present invention provides a submerged type membrane separation device and a membrane separation method which allow long-term stable filtration. In the submerged type membrane separation device including a membrane module having membrane units stacked on top of each other in stages, in each of which flat sheet membrane element each having a separation membrane are arranged, the membrane module is constructed of various membrane units differing in sludge-filtration resistance or pure-water permeation resistance, whereby it becomes possible to extend a device operation period of time lapsing before transmembrane plugging occurs, or equivalently, the necessity to clean membranes arises. Further, it also becomes possible to design to synchronize timings with which a plurality of membrane units require cleaning.
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