a DIY mini-protein skimmer


JohnHuff

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This is another mini-project made of recycled materials. It's the cheapest mini-project to date, under $5(!), but ended as a fail.

We had a couple of empty plastic bottles lying around and I knew we could make something with it and I decided to see if we could make a mini protein skimmer. All it is 2 empty water bottles joined by a 90 deg elbow. The vertical water bottle has a small hole drilled on top for water intake and a bio-ball and some cut up straws at the bottom.








The horizontal bottle has a mini-bulkhead fitting and 90 elbow poking out in the middle and another hole drilled at the end for water outlet. The water outlet has a small curved 5/16 piece of tubing in it. The water level in the horizontal bottle can be adjusted by moving the the curved tubing in and out.

The theory is that water coming in from the top of the vertical water bottle goes down the cut up straws creating a lot of water/air interface and bubbles which then fall into the horizontal tube with the water and then exit through the 90 degree elbow. The DOC (dissolved organic compounds) or gunk will be attracted to the bubbles and exit with them.

The main problem with this project, like the last one is that you can only miniaturize down to a certain point. At some point, there isn't enough water flow, pressure or distance to create similar conditions that a bigger one can. In this case, there wasn't enough water flow coming from the mini-water pump or height to create enough bubbles.

I'm thinking about modifying this to either
1) add more cut up straws to create more water/air contact
2) remove straws and bioball because I think at this size, the action of the stream of water falling on water will create bubbles itself
3) upsize to 2 liter bottles and a bigger pump to make it work.

As a functioning protein skimmer it was a failure but as a father/son project it was a success!
 
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j.w

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Well good for you for trying it together...........onward and upward to the next idea!

Oh and you can't delete the whole post once you've posted it as I have found. It seems something always has to be typed in the box unless there is something I am missing. Guess all you can do is say sorry or oops!
 
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JohnHuff

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Thanks everyone! I've now bought some more material, the most important of which is a ball valve, because I think the most important thing is to be able to adjust the water level and using the curved tubing just wasn't accurate enough. So, more on that later :)
 

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