POREX 博滤克斯（宝利事）管式膜应用描述-固体去除 SDI降低.pdf

F I LT R AT I O N ® POREX Tubular Membrane Filter Modules for Solids / SDI Reduction Choosing Tubular Membrane Filter Modules (TMF) for Silt Density / Solids Reduction The two (2) main technologies used to reduce suspended Reverse osmosis and Nanofiltration systems require protection from particulates solids are clarification or media filtration. Clarifiers require and in many cases there are particle dispersions in the low or submicron size continual supervision because they require a high level range that are not adequately handled by multimedia, cartridge or bag filtration. of monitoring and to prevent the passing large slugs of In the case of cartridge or bag filtration, change outs need to occur so frequently solids based upon temperature and chemistry changes. that it is cost prohibitive and labor intensive when trying to reduce the SDI (Silt The organic polymers used in clarifiers (used to promote Density Index) to an adequate level. Failure to reduce the level of the SDI will flocculation) can also cause problems. An excess of these result in poor system performance, plugging and fouling of the RO membrane, polymers will foul downstream filtration equipment such increased cleaning frequency and therefore a reduced lifespan of the RO modules. as RO membranes or Nanofilters. Since these polymers are These situations translate into higher operating costs. In most cases where these organic,they present a potential food source of bacteria difficult prefiltration conditions occur, the problem would best be addressed with which resulting biological growth and biofou