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Subject:

Re: water conserving or recycling flotation systems?

From:

Mark Nesbitt <[log in to unmask]>

Reply-To:

[log in to unmask]

Date:

Wed, 31 May 2006 12:35:29 +0100

Content-Type:

text/plain

Parts/Attachments:

Parts/Attachments

text/plain (62 lines)

Hi Lisa

I used a reycling system in Bahrain - it worked fine. We used a 
floation machine flowing into *two* large settling tanks, with the 
pump drawing water from the second tank. Most of the heavy silt 
settles in the first tank. A spare water tank held water for cleaning 
out the floation machine after every 200 litres of soil.

A water tanker came every 5 days,  when I took the opportunity to 
clean the whole system, but we could have doe this less often.

I think cross-contamination between samples (from the recycled 
water) is unlikely, as (a) the recycled water is drawn from below the 
surface, whereas charred remains will (mostly) be floating at the 
surface and (b) I doubt that wet charred remains would survive 
passage through a pump. But it would be easy to check this during 
operation. But for a multi-period site it would be best to batch 
samples, with complete cleaning of the machine between samples 
of different periods.

Mark

On 30 May 2006, at 12:34, Lisa Gray wrote:

> Dear all,
> 
> I'm hoping to help set up a flotation system in Kent this summer. My
> client has a water meter and we're  facing drought orders (hosepipe
> bans and threats of stand pipes)in the South East of England (bizzare
> but true) so water use will have to be carefully managed. I've read
> about water recycling flotation systems and I'm wondering what the
> experiences are of people who've used them. I'm also hoping those of
> you used to working in dry environments or situations where you can't
> use mains water can give me some design advice or point out some
> useful publications
> 
> all the best,
> 
> Lisa
> 
> Lisa Gray MSc
> Freelance Archaeobotanist
> 89 St. John's Rd,
> Faversham,
> Kent,
> ME13 8EN
> 01795 590603/ 07812028697



*********************************
Dr Mark Nesbitt
Centre for Economic Botany
Royal Botanic Gardens
Kew
Richmond, Surrey
TW9 3AE

Tel (direct): +44 (0)20 8332 5719
Fax: +44 (0)20 8332 5768
Visit www.plantcultures.org.uk

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