I would recommend against Siemens controllers for your centrifuge, however.=
  :)

http://www.nytimes.com/2011/01/16/world/middleeast/16stuxnet.html




On Jan 15, 2011, at 17:39 PM, Carl Denk wrote:

> Self cleaning centrifuges are common in the industrial area. Some have a=
=20
> cleaning cycle, and other work in a continuous feed mode, with=20
> continuous drain of the heavier material. They are common in water/waste=
=20
> water treatment plants, chemical plants, etc. They may be used to=20
> concentrate the waste stream or in the product process. Might try to=20
> contact the process engineer or manufacturer and pick their brain.
>=20
> On 1/15/2011 7:17 PM, IVP wrote:
>> Hi all,
>>=20
>> I have a large outdoor fish pond (and a typo I just did, a fish
>> pong, which it does if you stir it up) that gets a lot of sun, so
>> made an algae killer with a 10W UV-C germicidal lamp
>>=20
>> http://dl.dropbox.com/u/18683201/UV-C_algae_killer.jpg
>>=20
>> (very reminiscent at night of Mr Burns in The Springfield Files.
>> Maybe I should call it Burnsy)
>>=20
>> As you can see, it will turn pea soup into clear water by
>> giving algae the Sunburn From Hell, which causes it to clump
>> in fluffy bits about 1mm big. That is the brown muck which
>> accumulates and needs flushing out. It's pretty 'sticky' too
>> and gradually coats anything it comes in contact with
>>=20
>> During the day the pond is murky because of this dead algae
>> generally scattering sunlight, but a night flash shows that the
>> water itself is pretty clear. Water is about 80cm deep
>>=20
>> http://dl.dropbox.com/u/18683201/day_night.jpg
>>=20
>> So I was looking around and found this site
>>=20
>> http://www.simplecentrifuge.com/gallery-series-17.html
>>=20
>> A high-speed centrifuge seems to a fairly good job of
>> removing the very light live algae, so it should be at least as
>> good with these bigger particles
>>=20
>> The question is though that some manual effort seems needed
>> to periodically remove the sludge and I'm wondering if anyone
>> has seen an automatic method that could be built at home. I
>> don't really have room for a settling tank, and have to keep the
>> health of the fish in mind too of course
>>=20
>> Any thoughts or suggestions appreciated
>>=20
>> I've thought about trying back-flushing, electrostatics (could
>> that be done in water ?), gravity, but not filtering. Filters clog
>> quickly and are just too high-maintenance
>>=20
>> Joe
>>=20
> --=20
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--=20
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