What temperature and time to kill pathogens?
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TOPIC: What temperature and time to kill pathogens?

What temperature and time to kill pathogens? 05 Jan 2014 23:19 #6897

  • paulv
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Is there a recommended temperature and time to heat fecal matter to kill pathogens and make it safe from a human health perspective?

Re: What temperature and time to kill pathogens? 06 Jan 2014 06:25 #6898

  • JKMakowka
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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.
Krischan Makowka
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Last Edit: 06 Jan 2014 06:30 by JKMakowka.

Re: What temperature and time to kill pathogens? 08 Jan 2014 02:51 #6912

  • nazimuddin
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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
Sayed Mohammad NAZIM UDDIN
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Re: What temperature and time to kill pathogens? 08 Jan 2014 06:31 #6914

  • JKMakowka
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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.
Krischan Makowka
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Last Edit: 08 Jan 2014 06:34 by JKMakowka.
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Re: What temperature and time to kill pathogens? 08 Jan 2014 07:33 #6915

  • F H Mughal
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The attached paper on Bacterial Die-off Kinetics in WSP might help.

F H Mughal
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Re: What temperature and time to kill pathogens? 09 Jan 2014 18:22 #6937

  • groverhmc
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I hope this graph helps you to have an idea.

pathogenskilltime.png


Source: Decentralised sanitation and reuse. Lens, Zeeman and Letinga 2001

Kind regards

Grover
Grover H. Mamani C.
MSc. Urban Water and Sanitation
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Re: What temperature and time to kill pathogens? 12 Jan 2014 08:14 #6953

  • F H Mughal
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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
F H Mughal (Mr.)
Karachi, Pakistan

Re: What temperature and time to kill pathogens? 13 Jan 2014 03:01 #6960

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Re: What temperature and time to kill pathogens? 13 Jan 2014 17:19 #6972

  • F H Mughal
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Thanks, pal. I appreciate

Best,
F H Mughal
F H Mughal (Mr.)
Karachi, Pakistan

Re: What temperature and time to kill pathogens? 17 Jan 2014 15:51 #7036

  • smecca
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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...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)
Stephen Mecca, Ph.D.
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Department Engineering-Physics-Systems
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Providence College
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Last Edit: 17 Jan 2014 19:02 by muench. Reason: added two hyperlinks to related forum posts
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