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- What temperature and time to kill pathogens in faecal sludge?
What temperature and time to kill pathogens in faecal sludge?

- paulv
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What temperature and time to kill pathogens?
Is there a recommended temperature and time to heat fecal matter to kill pathogens and make it safe from a human health perspective?
In the USA you will need to treat it according to EPA "Class A (EQ) biosolid" regulations, which includes methods for heat pasteurization as far as I know.
Microbiologist & emergency WASH specialist
Last Edit: 06 Jan 2014 05:30 by JKMakowka.
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I have also the similar question:I am working in Mongolia on fecal composting. Lowest temperature is -40 degree C.
Under which low temperature e.coli or salmonella can be killed or partially destroyed?
Thank you
Nazim
Under which low temperature e.coli or salmonella can be killed or partially destroyed?
Thank you
Nazim
Sayed Mohammad Nazim Uddin, PhD
Visiting Research Associate & Sessional Lecturer
Community-based Research Laboratory (CBRLab)
Department of Geography, University of Victoria
Victoria, BC, Canada
Email: This email address is being protected from spambots. You need JavaScript enabled to view it.
Assistant Professor, Environmental Sciences
Asian University for Women
20/A, M M Ali Road, Chittagong, Bangladesh
Email: This email address is being protected from spambots. You need JavaScript enabled to view it.
www.auw.edu.bd
As far as I know, low temperatures will for the most part (save for some cellular damage due to ice crystals forming) not really kill any bacteria. It will prevent them from multiplying but otherwise pretty much conserve them.
What could be interesting in a cold but dry country like Mongolia though might be sun based UV treatment. I am speculating a bit here, but under the right conditions and with the cellular DNA repair mechanisms pretty much shut down due to the cold, direct sunlight (e.g. limited cloud-cover) especially at higher sub-tropical altitudes might be quite efficient in killing bacteria.
What could be interesting in a cold but dry country like Mongolia though might be sun based UV treatment. I am speculating a bit here, but under the right conditions and with the cellular DNA repair mechanisms pretty much shut down due to the cold, direct sunlight (e.g. limited cloud-cover) especially at higher sub-tropical altitudes might be quite efficient in killing bacteria.
Microbiologist & emergency WASH specialist
Last Edit: 08 Jan 2014 05:34 by JKMakowka.
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The attached paper on Bacterial Die-off Kinetics in WSP might help.
F H Mughal
F H Mughal
F H Mughal (Mr.)
Karachi, Pakistan
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- groverhmc
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- Sanitation Adviser at WASTE NL
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Grover H. Mamani C.
MSc. Urban Water and Sanitation
The Netherlands
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pathogenskilltime.png (Filesize: 41KB)
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Dear Mr. Grover,
That is a very useful and interesting graph. Could you kindly upload the full publication?
Regards,
F H Mughal
That is a very useful and interesting graph. Could you kindly upload the full publication?
Regards,
F H Mughal
F H Mughal (Mr.)
Karachi, Pakistan
- paulv
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Re: What temperature and time to kill pathogens?
Thanks, pal. I appreciate
Best,
F H Mughal
Best,
F H Mughal
F H Mughal (Mr.)
Karachi, Pakistan
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Re: What temperature and time to kill pathogens?
Yes, most bacteria will go dormant at such temperatures. I just noticed a pathogen kill graph posting that should help on the question. In the S-Lab at Providence College US we are experimenting with several options for killing pathogenic bacteria including: SOLDIS, NH3 from urine, slow sand filtering and carbon filtering (this is just getting underway. Our work is related to our Microflush toilet which produces a small amount of blackwater that we are seeking to treat (
forum.susana.org/forum/categories/106-us...mit=12&start=12#5616
).
There is a project in the UK on a nano membrane technology and this has been reported on the SuSanA forum.
( forum.susana.org/forum/categories/105-pr...nfield-university-uk )
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There is a project in the UK on a nano membrane technology and this has been reported on the SuSanA forum.
( forum.susana.org/forum/categories/105-pr...nfield-university-uk )
++++++++
Note by moderators: This post was made by a former user with the login name smecca who is no longer a member of this discussion forum.
Last Edit: 17 Jan 2014 18:02 by muench. Reason: added two hyperlinks to related forum posts
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- maryanneleblanc
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Re: What temperature and time to kill pathogens?
This link no longer works. Try this one:
www-wds.worldbank.org/servlet/WDSContent...d/PDF/multi0page.pdf
www-wds.worldbank.org/servlet/WDSContent...d/PDF/multi0page.pdf
- joeturner
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Just a note of caution - even if those temperatures are definitive, the whole volume of the faeces would have to be raised to that temperature for that time for the pathogens to be completely sanitised.
Using a temperature probe to find areas of high temperature may not be enough if there are also areas where the pathogens survive. It will depend on the treatment system as to whether this is a problem in any given situation.
Using a temperature probe to find areas of high temperature may not be enough if there are also areas where the pathogens survive. It will depend on the treatment system as to whether this is a problem in any given situation.
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- What temperature and time to kill pathogens in faecal sludge?
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