<table border=0 cellpadding=2 cellspacing="0"><tr><td>
<pre>Hi everyone

In response to a previous posting.............

the exact nature of the wastewater - both volume per kilo of
fruit processed and pollution characteristics - depends upon
the oil extraction process (classical/3 phase/2 phase etc.)

As a guide, this is some ball-park data for Tunisian
wastewaters:


pH 4.5 - 6.0
Water Content 83 - 92
Organic and Volatile Material 7 - 15
Mineral Solids 1 - 2
Residual Oil 0.3 - 30.0
Total Sugars 2 - 8
Reducing Sugars 1 - 8
Polyalcohols 1.0 - 1.5
Protein 0.5 - 7.5
Pectins and Tannins 1.0 - 1.5
Polyphenols 5-17


Suspended Solids 35 - 40 g/l
BOD5 65 - 70 g/l
COD 40 - 400 g/l

(All units % unless otherwise stated)

OME tends to be pretty acidic and reasonably
phytotoxic - so don't go overboard with the irrigation!!!!
The amount of organic pollution (as measured by BOD/COD) is
the problem at wastewater treatment works - coupled with the
variable flow rates/load and seasonal nature.

Hope this is of some use

Glynn

__________________________________________________ ________________

Dr. Glynn Skerratt
Director
Centre for Environmental Technology
Staffordshire University
School of Sciences
College Road
Stoke-on-Trent
ST4 2DE

tel. +44 1782 294354
fax +44 1782 295768
mobile 07714 096833
e-mail rgs1@staffs.ac.uk or Glynn@environment14001.freeserve.co.uk
http://www.staffs.ac.uk/schools/scie...y/cet/cet.html
</pre>
</td></tr></table>