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https://www.fishlaboratory.com/fish/aquarium-filter/
An aquarium filter should be running 24 hours a day, even at night. The filtration system in an aquarium is not only responsible for keeping the water clear. In fact, they are …
https://www.sciencedirect.com/topics/engineering/flow-filtration
Filtration is a physical, pressure-driven separation process, where the application of pressure on the feed-side results in a pressure gradient through the membrane: the TMP. The TMP is defined as. (1) TMP = p F − p P normal flow filtration mode. (2) TMP = p F − p R 2 − p P tangential flow filtration mode.
https://water.mecc.edu/courses/ENV110/lesson6_5b.htm
The backwash frequency is the same as filter run time. Either term can be used to signify the number of hours between backwashing. The backwash period is the length of time which backwashing lasts. The backwash water is the water used to backwash the filter. For the filters we're considering, backwash water should be 1-5% of the water filtered during the filter run.
https://www.cdc.gov/coronavirus/2019-ncov/community/ventilation.html
Thus, the increased ACH and lower k value associated with the portable HEPA filtration unit reduced the wait time from the original 5 hours and 45 minutes to only 1 hour and 24 minutes, saving a total of 4 hours and 21 minutes before the room could be safely reoccupied.
https://cdn.cytivalifesciences.com/dmm3bwsv3/AssetStream.aspx?mediaformatid=10061&destinationid=10016&assetid=17054
Cross flow filtration (CFF, also known as tangential flow filtration TFF) is a filtration technique in which the starting solution passes tangentially along the surface of the filter. A pressure difference across the filter drives components that are smaller than the pores through the filter. Components larger than the filter pores are retained ...
https://www.cytivalifesciences.com/en/us/support/online-tools/crossflow-and-normal-flow-filtration/
Normal Flow Filtration (NFF) Calculator . Calculates the required productivity, required filter area, and number of 10 inch Equal. View Calculator. Permeate Volume and Process Time Calculator. Enter some process values to calculate the permeate volume and process time. View Converter.
https://www.pall.com/content/dam/pall/food-beverage/literature-library/non-gated/FBTADIRCROSSEN.pdf
Direct flow filtration systems suited for handling higher suspended solids loads are diatomaceous earth (DE, Kieselguhr) or other types of precoat filtration systems, automated self-cleaning screen devices, hollow fiber modules operated in direct flow mode, multi-media beds, and more.
https://www.tblplastics.com/tangential-flow-filtration-tff/
Tangential flow filtration (TFF), also known as Cross-flow filtration, is a process of separation widely used in bio-pharmaceutical and food industries.It is different from other filtration systems in that the fluid is passed parallel to the filter, rather than being pushed through a membrane perpendicularly which can clog the filter media.
https://www.mrwa.com/WaterWorksMnl/Chapter%2018%20Filtration.pdf
The rate of flow on a filter depends on the type of filter. A rapid sand filter will have a flow of 2-3 gpm/square foot of filter area. The high rate filter may have 4-6 gpm/square foot applied to the surface. A constant rate flow valve is almost fully closed when a filter is clean so that the desired water level on top of the filter is maintained.
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