Hi
Since Archimedes screws are used to pump waste water
the opposite way (produce energy) will work as well.
with 6 feet (about 2m) and 40000(us)gpm (about
3000l/s) you will get about 50 kW. the screw will,
instead of any kind of turbine, not clogg that fast.
this project is a good thing, please keep it going
regard
thomas
--- Radu Babau - VARSPEED Hydro
<[EMAIL PROTECTED]> wrote:
>
> Hello Ken,
>
>
> A rough calculation shows the opportunity to get
> ~150 kW output power, using a Kaplan or propellor
> turbine.
>
> However, the discharge of a waste water plant is not
> always that clean as you would like to believe.
> Those tiny suspension particles will make the
> turbine to clogg randomly, so it has to be cleaned
> quite often in comparison with clean water turbines.
> There is also higher errosion due to small metal and
> sand particles. This means higher general maitenance
> costs. One simple idea is to reverse the turbine
> speed once a day, using a softstarter for instance.
> The water turbulence would contribute to rotor
> cleaning, so you will have to seldom dismantle and
> clean it manually.
>
> Since you say the flow is constant, you could use a
> constant speed induction generator, and a fixed
> pitch rotor. Things with moving blades will have
> higher chances to get gripped by the muddy water.
> Please choose carefully the rotor characteristics.
>
> It's a feasible idea after all. There are
> experienced guys in the group who could put you on
> the track for a good propellor supplier. The first
> name which crosses my mind right now is Peter
> Ruyter, www.cargo-kraft.se
>
> BR,
>
> Radu
>
>
> ----- Forwarded message from Ken Carman
> <[EMAIL PROTECTED]> -----
> Date: Wed, 16 Feb 2005 16:48:21 -0800 (PST)
> From: Ken Carman <[EMAIL PROTECTED]>
> Reply-To: Ken Carman <[EMAIL PROTECTED]>
> Subject: waste water discharge . . .
> To: [EMAIL PROTECTED]
>
> Our city has a large water treatment facility with a
> discharge that has a head
> of 6 to 8 feet and a constant year-round flow of
> nearly 40,000 gpm. Is this a
> good opportunity to persue putting a turbine on or
> not?
>
> Ken [EMAIL PROTECTED]
>
> ----- End forwarded message -----
>
>
> [Non-text portions of this message have been
> removed]
>
>
>
>
>
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