Questions tagged [fluid-filtration]

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What material can wick up fluids while not allowing micro-organisms to pass?

I'm looking for a material that can wick up a solution containing nutrients and sugars. The dirty side of the wick should touch a medium to draw up the solution, on the clean side of the wick ...
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1answer
30 views

How to pre-process paint residue prior to an RO system?

I am planning to install a reverse osmosis (RO) waste system that will purify waste before putting it into a drain. However there are certain substances like fibrous matter, fats, grease and ...
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42 views

Is there a valve design or system that can do this?

I am trying to come up with a way to bleed air from a tube to avoid air (gas) from reaching the other end of the tube. Is there a way to do this automatically? It must be able to work in all ...
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1answer
53 views

Membrane permeate prediction software

I wanted to know if there are any open software or even purchasable software available to predict the permeate quality through a nanofiltration module. I am designing a plant for my final year ...
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1answer
64 views

Does filter surface area affect resistance?

I am in the process of designing the enclosure for a small kiosk like project, and intend on having two fans (Noctua NF-A12x25, chosen for their high runtime rating, quietness, as well as other ...
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1answer
28 views

Nanofiltration Membranes design understanding

I am doing some research to design a nanofiltration assisted water treatment plant and wanted to know some information on purchasing membranes. I am not sure whether or not these membranes come in ...
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85 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
224 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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31 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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102 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
76 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
26 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
42 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
968 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
16k 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
499 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 ...