What temperature and time to kill pathogens in faecal sludge?

15.6k views

Page selection:
  • joeturner
  • joeturner's Avatar
  • Posts: 717
  • Karma: 23
  • Likes received: 185

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.

Please Log in to join the conversation.

You need to login to reply
  • maryanneleblanc
  • Posts: 1
  • Likes received: 0

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

Please Log in to join the conversation.

You need to login to reply
  • former member
  • Posts: 101
  • Likes received: 3

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)

++++++++
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.

Please Log in to join the conversation.

You need to login to reply
  • F H Mughal
  • F H Mughal's Avatar
  • Senior Water and Sanitation Engineer
  • Posts: 1026
  • Karma: 20
  • Likes received: 227

Re: What temperature and time to kill pathogens?

Thanks, pal. I appreciate

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

Please Log in to join the conversation.

You need to login to reply
  • paulv
  • Topic Author
  • Posts: 19
  • Likes received: 5

Re: What temperature and time to kill pathogens?

Please Log in to join the conversation.

You need to login to reply
  • F H Mughal
  • F H Mughal's Avatar
  • Senior Water and Sanitation Engineer
  • Posts: 1026
  • Karma: 20
  • Likes received: 227

Re: What temperature and time to kill pathogens?

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

Please Log in to join the conversation.

You need to login to reply
  • groverhmc
  • groverhmc's Avatar
  • Sanitation Adviser at WASTE NL
  • Posts: 7
  • Karma: 3
  • Likes received: 5

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
Grover H. Mamani C.
MSc. Urban Water and Sanitation
The Netherlands
E-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.
Mobile: +919428621967(India), +31628476049(Netherlands), +59173006364(Bolivia)
Attachments:
The following user(s) like this post: mst, paulv

Please Log in to join the conversation.

You need to login to reply
  • F H Mughal
  • F H Mughal's Avatar
  • Senior Water and Sanitation Engineer
  • Posts: 1026
  • Karma: 20
  • Likes received: 227

Re: What temperature and time to kill pathogens?

The attached paper on Bacterial Die-off Kinetics in WSP might help.

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

This message has an attachment file.
Please log in or register to see it.

The following user(s) like this post: JKMakowka, paulv

Please Log in to join the conversation.

You need to login to reply
  • JKMakowka
  • JKMakowka's Avatar
  • Just call me Kris :)
  • Posts: 1044
  • Karma: 35
  • Likes received: 359

Re: 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.
The following user(s) like this post: canaday

Please Log in to join the conversation.

You need to login to reply
  • nazimuddin
  • nazimuddin's Avatar
  • Posts: 33
  • Karma: 2
  • Likes received: 10

Re: What temperature and time to kill pathogens?

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, 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

Please Log in to join the conversation.

You need to login to reply
  • JKMakowka
  • JKMakowka's Avatar
  • Just call me Kris :)
  • Posts: 1044
  • Karma: 35
  • Likes received: 359

Re: 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.

Please Log in to join the conversation.

You need to login to reply
  • paulv
  • Topic Author
  • Posts: 19
  • Likes received: 5

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?

Please Log in to join the conversation.

You need to login to reply
Page selection:
Share this thread:
Recently active users. Who else has been active?
Time to create page: 0.195 seconds
Powered by Kunena Forum