Re: suggestions to agitate stream flow?

Would it be possible to get a little more information on this problem?  It
sounds interesting, but it appears to have some pretty serious constraints.
Where are the VOC's coming from?  Existing ground water contamination,
natural sources, or a current effluent stream?  What is the stream flow rate
and dimensions?  What is the VOC loading and composition you need to
mitigate? Are there other locations besides the stream which could be used
for the mitigation?  Could you just fill a few porous bags with activated
charcoal and some rocks and make a filtering dam?

There are some resins which can remove VOC's from water or air without too
much trouble.  They come in bead form and could be placed into your stream
between screens or in bags.  A little microwaving will remove the VOC's
later on.  If this is worthwhile, I can probably come up with a source for
them.

One would hate to develop and install a system only to have it made obsolete
when the paint can up stream was removed.

Michael



"Robert Kim" <[EMAIL PROTECTED]> wrote in message
news:[EMAIL PROTECTED]
> On Wed, 20 Nov 2003, Mike Halloran wrote:
>
> > Yes, but the only head available is the hydraulic gradient of the stream
bed.
> > And because the grade is not very steep, the entry to a narrow vertical
channel
> > would become quite long.
> >
> > Me, I'd try to build the stream bed up, with concrete or plywood, so the
stream
> > becomes wide and shallow and the narrow channel is horizontal.
> >
> > That would also allow the sun to interact with the VOCs, by increasing
the
> > water temperature and raising the evaporation rate, and by exposing them
to UV
> > radiation and the possibility of reacting chemically to become something
else.
> >
> > The plywood is also degradable, so the apparatus will eventually
decompose and
> > flush itself away.
>
> Thank you, Mike.  That's a pretty good idea you have.  Now the sunlight
> into that area is low since it is heavily wooded but the increase in
> surface area to enhance evaporation could help a lot.
>
> I greatly appreciate your input on this.
>
> Bob