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Subject: DIGEST 3.3. Discussion with Kenneth Yongabi (CM) et al.
From: "jacky foo (IOBB)" <[log in to unmask]>
Reply-To:IOBB E-Seminar: Biodegradation of Lubricating oil contaminated soil (08-31 May)" <[log in to unmask]>
Date:Mon, 22 May 2006 14:45:30 +0200
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Note: 
Please find original version of messages 
at http://www.iobbnet.org/drupal/node/view/885
which may contain images and html links. 

This interesting e-seminar will close on 31 May. 
Please take the opportunity materials available at  
http://www.iobbnet.org/news/e-sem-16.html  



+++++++++++++++ 
clean up large scale spills
Submitted by Jacky Foo on Tue, 16/05/2006 - 17:56.
+++++++++++++++ 

Paul T mentioned about clean up large scale spills :
>It occurs to me that any attempt to clean up large scale spills would
>still require a large amount of urea or pleurotus substrate.

Looking at the title of Yongabi's paper, I guess I was misled by it at
the beginning and throught that Pleurotus ostreatus was used as a
biocatalyst. In fact we are referring to only the spent mushroom
substrate.

>"Potentials of Pleurotus ostreatus and urea as Bio Catalysts in the
>Biodegradation of Lubricating oil contaminated soil" by Mr Kenneth
>Yongabi (Cameroon) et. al.

In clean up of spills, long compost piles have been used e.g. in
Finland where the contaminated soils are mechanically handled and
prepared for treatment in "piles" or compost windrows. See
"Bioremediation of petroleum hydrocarbon-contaminated soil by
composting in biopiles" by K.S. J¨rgensen*, J. Puustinen1, A.-M.
Suortti. 2000
-----
Jacky Foo
http://www.iobbnet.org





+++++++++++++++ 
Phytoremediation of Contaminated Soil
Submitted by IOBB Admin Paul T on Thu, 18/05/2006 - 00:39.
+++++++++++++++ 

IOBB Administration Paul Totterdell

Kenneth wrote

The combination of the oil components also provides a great carbon
source, the lipids concentration with the high protein source
generates a high level of lipo proteins that may be lower with the use
of plant based materials. Lipoprotein is very essential for building
the bacterial cell wall. With such a great amount of these nutrients
for the microbes the rate of metabolism in the various biochemical
pathways goes faster.

Paul writes:

The above suggests that the contaminating oil itself provides
resources for bacterial growth. With a self generating nitrogen supply
combined with the trace elements that will still be present in most
contaminated soils the whole process has potential to be self
sustaining.

Is there any data on the by products (wastes)of the bacterial
activity?

Is it possible to introduce a bacteria or other life form to the
process that will fix free nitrogen from the air spaces?

Regards
Paul T



+++++++++++++++ 
Biodegradation in case of polycyclic hydrocarbons by Pleurotus
Submitted by Sahibzada Irfanullah on Mon, 22/05/2006 - 11:17.
+++++++++++++++ 

Here is another good abstract that provides the potential of
application of Pleurotus even in the hydrocarbons of polycyclic
nature.

The article is "Biodegradation of soil-adsorbed polycyclic aromatic
hydrocarbons by the white rot fungus Pleurotus ostreatus" that can be
found at web link below.

http://www.scirus.com/srsapp/sciruslink?src=web&url;=http%3A%2F%2Fpoll
en.utulsa.edu%2FEnviron-Micro%2FPleurotus%2520and%2520polycyclic%2520h
ydrocarbons.pdf

Abstract
The white rot fungus, Pleurotus ostreatus, metabolized four soil
adsorbed polycyclic aromatic hydrocarbons:50% of pyrene (0.1 mg g_1
dry soil), 68% of anthracene and 63% of phenanthrene were mineralized
after 21 d. Biodegradation was increased to 75%, 80% and 75%,
respectively of the initial concentration when 0.15% Tween 40 was
added. Biodegradation of pyrene in the presence of surfactant and H2O2
(1.0 mM) was 90%. Benz[a]pyrene was also oxidized by Pleurotus
ostreatus but it is not mineralized.


Sahibzada Irfanullah Khan
IOBB National Representative - Pakistan

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