Re: [CAD_CAM_EDM_DRO] re: killing bacteria

Elliot Burke wrote:

> A standard way of killing bacteria in liquids is to use short wavelength UV:
> a bacteriacidal (?) lamp. These are little mercury vapor tubes, with no
> fluorescent lining. They efficiencly turn electrical power into 257 nm
> wavelength radiation, which kills just about anything.

Hg does have a 257.4 line but it is wimpy compared to the 253.6 line (~ 40 to 80 times ).
There are also good lines in the blue and the red which make it possible for people to use the lamps for illumination. For a
really intense lamp one should be able to take the outer shield off a regular yard lamp...leaving just the quartz envelope. Bear in
mind though that those lamps are intense and can do real eye damage.
The 253.6 line is so effective because that wavelength is both well absorbed by several bond structures and energetic enough to
cleave them .

> Don't look at them
> directly, or let the radiation contact you!

Sunburn city.

> They also have a green and a
> few other Hg line outputs, so you can seem when they are running. A UV
> absorbing glass or plastic is enough protection, or anything opaque.
> They should be available by special order at lighting distributors.
> Electrically they are the same as a fluorescent lamp, and so will start and
> run in a normal fixture.
>
> My guess is that these should kill any bacteria, if the liquid is at all
> transparent.
>
> If not, try ozone.
>
> The UV or ozone might break down the organics in you coolant.
>
> Elliot Burke
>
> Welcome to CAD_CAM_EDM_DRO@...,an unmoderated list for the discussion of shop built systems, for CAD, CAM, EDM, and DRO.
>
> Addresses:
> Post message: CAD_CAM_EDM_DRO@yahoogroups.com
> Subscribe: CAD_CAM_EDM_DRO-subscribe@yahoogroups.com
> Unsubscribe: CAD_CAM_EDM_DRO-unsubscribe@yahoogroups.com
> List owner: CAD_CAM_EDM_DRO-owner@yahoogroups.com, wanliker@...
> Moderator: jmelson@... timg@... [Moderator]
> URL to this page: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO
> bill,
> List Manager
>
> FAQ: http://www.ktmarketing.com/faq.html
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/