Questions tagged [fluid-filtration]

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Testing of water filtration device (and membranes removal characteristics)

I am doing my final year project as an undergraduate and am designing a brackish water filtration device that uses nanofiltration membranes. I wanted to know if there is any suggestions on how I could ...
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38 views

How the 3M Aura 9332+ masks filtrate airborne particles/virus?

The 3M Aura 9332+ mask is labeled FFP3 which means that it filters at least 99% of airborne particles. This article mentions that N95 masks (which filtrate 95% of airborne particles) filtrate the ...
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2answers
125 views

Why are/were sewers made large enough for somebody to walk down in there?

Today, I have been reading a lot about sewer systems on Wikipedia, in the hope that I would find information or at least photos showing what I think of as sewers, namely somewhere under the streets in ...
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28 views

Do companies recover CO2 and water from the purification step of cryogenic air separation, and how?

In the 3rd step of cryogenic air separation, filtered air is purified to remove water, CO2, and hydrocarbons from the N2-O2-Ar stream. Im interested in knowing what happens with that CO2 and water. ...
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46 views

Estimating Static Pressure @ Target Airflow (boost fans)

How do I estimate a pressure/flow curve for a filter of specified area, efficiency rating, MERV and MPR?(Duct work is negligible) I am trying to pick an appropriately rated fan/fans to maintain a ...
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88 views

Solid-liquid separation of a crystal slurry

Let me preface my question by saying I am a recent chemical engineering graduate and apologize if my inexperience shows. I have designed a batch process which results in a water slurry stream ...
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0answers
65 views

What's the flow resistance of a honeycomb sieve?

Honeycomb sieves are starting to see applications in wastewater screening. What is the flow resistance of a honeycomb screen? I would expect something similar to the Kirschmer formula (used for bar ...
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0answers
22 views

Determing the optimal dimensions for hydrocyclone water/sediment separation

OK, let's be clear: I'm a software engineer (retired), not a physicist, hydrologist, or hydraulics person, so please be gentle. Back Story: In the process of developing an open source system for ...
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1answer
41 views

Trying to determine the name of a filter set up

I am having an issue with caking in a process. I am already trying to figure out ways to prevent the caking in the first place but I need a short term solution that will allow the line to continue ...
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1answer
836 views

How can I separate gear oil from metal shavings to weigh worn metal?

I have tested a gear box for many hours. Where the gears are made of a hardened steel alloy and the housing is 7000 series aluminum. Now I drained the gear box of its gear oil and I need to weight the ...
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3answers
11k views

How to filter outside air during wildfire to safe breathable level?

I've had an experience of having outside air heavily polluted by wildfire smoke, and now I'm reading up on the wildfire happening in Southeast Asia. When the air outside got too polluted to breathe, I ...
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2k views

Why does filter efficiency decrease with thickness?

I understand that the most important parameters for a filter are basically pressure drop and thickness, both of which affect efficiency. However why does thickness cause a change in efficiency? I'm ...
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1answer
464 views

Gas cleaning in activated carbon filters - How much moisture is needed and why?

Biogas and sewage (typically around 60% CH4, rest CO2) gas is typically treated in activated carbon (ac) filters to remove H2S and siloxanes. The ac filters need a small amount of oxygen (>0,4%) to ...
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1answer
2k views

Filter Area for given flow rate

Background For a washing process after a crystallization we want to know how much filter area we would need and if said area will work for our fixed volume flow. Calculation $\dot{V_F}$ has a ...