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- What temperature and time to kill pathogens in faecal sludge?
What temperature and time to kill pathogens in faecal sludge?
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- joeturner
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Re: What temperature and time to kill pathogens?
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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You need to login to reply- 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
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You need to login to reply- former member
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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)
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You need to login to reply- paulv
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Re: What temperature and time to kill pathogens?
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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
Karachi, Pakistan
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You need to login to reply- groverhmc
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- Sanitation Adviser at WASTE NL
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Re: What temperature and time to kill pathogens?
I hope this graph helps you to have an idea.
Source: Decentralised sanitation and reuse. Lens, Zeeman and Letinga 2001
Kind regards
Grover
Source: Decentralised sanitation and reuse. Lens, Zeeman and Letinga 2001
Kind regards
Grover
Grover H. Mamani C.
MSc. Urban Water and Sanitation
The Netherlands
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MSc. Urban Water and Sanitation
The Netherlands
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Mobile: +919428621967(India), +31628476049(Netherlands), +59173006364(Bolivia)
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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
Karachi, Pakistan
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You need to login to replyRe: What temperature and time to kill pathogens?
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.
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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
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Assistant Professor, Environmental Sciences
Asian University for Women
20/A, M M Ali Road, Chittagong, Bangladesh
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www.auw.edu.bd
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
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You need to login to replyRe: What temperature and time to kill pathogens?
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.
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You need to login to reply- paulv
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- What temperature and time to kill pathogens in faecal sludge?
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