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On-site sanitation based on bio-additives and pit design (LSTH, UK and Tanzania, South Africa and Vietnam)
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Re: [SuSanA forum] On-site sanitation based on bio-additives and pit design (LSTH, UK and Tanzania, South Africa and Vietnam) (Processing technologies for excreta or faecal sludge)
Wageningen University is working on a final document, hopefully we will have it soon
best regards jeroen
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Re: On-site sanitation based on bio-additives and pit design (LSTH, UK and Tanzania, South Africa and Vietnam)
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forum.susana.org/forum/categories/53-fae...it=12&start=24#11976
--> I wrote here about research results that Katja Grolle from Wageningen Uni presented in Hanoi which were done as part of this project. I think she was also busy submitting a journal paper about this work, perhaps it is out by now?
And this thread where I talked about updating the Wikipedia article on pit additives with results from Katja's research (plus older research by WRC in South Africa):
forum.susana.org/forum/categories/53-fae...ve-microorganisms-em
Hope this helps a little bit.
Regards,
Elisabeth
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Dooes anyone know if there is a final report for this project (bio-additives generally rather than tiger worms specifically)? I can't immediately find it anywhere but I may not be looking in the right places!
Alison
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Re: On-site sanitation based on bio-additives and pit design (LSTH, UK and Tanzania, South Africa and Vietnam)
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Re: AW: a few more questions
Here are my answers to your questions:
The Sanger institute as you point out in the link is a world class institute doing work on genomics a.o. and is doing the 454 sequencing for us on the latrine samples, to identify what kind of bacteria and archea families are there.You mentioned the Sanger Institute like one should know what this is? Where and what is it? Oh, I guess it must be this one: www.sanger.ac.uk/
We have looked in our samples for the type of bacteria present, but also which Archea are there, several Archae are methanogenic and as a result their presence or absence might be associated with better performance.You said “we are looking at Archea data” – what do you mean exactly? I know that Archea = methanogens but would did you mean with this statement?
We will start in the new year, we have moved the website to our server now and hope to update it from January onwards.You said you are in the process of updating your website (www.sanitationventures.com) – I had a look and I can’t see any new information on there yet?
Well it will depend if the journals we have in mind accept our papers, but yes we intend to publish open access.You said that papers will come out in the next couple of months – where will they be published? I think you mentioned in the past that you will pay extra to have them available online, is this still the case?
The work was done in Wageningen and to my knowledge it was wastewater, but could as well have been sludge.You mentioned that the inoculum added was Dutch wastewater – is this really true or was it rather Dutch activated sludge from a WWTP?
We selected latrines where the groundwater table was at least 5 meters away, we installed piezometers and did soil type and soil moisture analysis. Climate data was also collected.You said all your latrines in Tanzania (and also in Vietnam?) were in well-draining soils – how did you measure whether the soil was well draining or not? Which of the soil characteristics were measured? How about rainfall data and level of groundwater, was that all taken into consideration?
I cannot tell you what kind of enzymes were used, and the increase was 12-15%.With those Novozyme enzymes from the US: when you did the lab work, did you see a 15% or a 50% increase in decomposition rates? What kind of enzymes are these? Do you happen to know if they are mentioned on their website, i.e. here: www.novozymes.com/en/Pages/default.aspx
Better performing latrines had higher contents of phophates but at the moment I do not yet have an explanation for this.You mentioned that phosphate helps in the good performing pit latrines – what do you mean by this and what is your explanation for this observation?
I think in a pit latrine we have an initial aerobic process breaking material down but think that the dominant processes are anaerobic.Is your assumption that the degradation processes in pit latrines is primarily of an anaerobic nature?
We did not encounter huge amounts of other waste. A few latrines (<10%) had rags in them, this is rural Tanzania, not urban Dar es Salaam or South Africa.When you took your core samples from the pit latrines how did you cope with the solid waste issue (normally lots of solid waste in the pits, like rags, plastic bags and so forth)?
Hope these answers make things a bit clearer.
Regards,
Jeroen
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- You said “we are looking at Archaea data” – what do you mean exactly? I know that Archaea = methanogens but would did you mean with this statement?
- You said that papers will come out in the next couple of months – where will they be published? Could you pay extra to have them available online?
- You said all your latrines in Tanzania (and also in Vietnam?) were in well-draining soils – how did you measure whether the soil was well draining or not? Which of the soil characteristics were measured? How about rainfall data and level of groundwater, was that all taken into consideration?
- With those Novozyme enzymes from the US: when you did the lab work, did you see a 15% or a 50% increase in decomposition rates? What kind of enzymes are these? Do you happen to know if they are mentioned on their website, i.e. here: www.novozymes.com/en/Pages/default.aspx
- You mentioned that phosphate helps in the good performing pit latrines – what do you mean by this and what is your explanation for this observation?
- Is your assumption that the degradation processes in pit latrines is primarily of an anaerobic nature?
- When you took your core samples from the pit latrines how did you cope with the solid waste issue (normally lots of solid waste in the pits, like rags, plastic bags and so forth).
Freelance consultant on environmental and climate projects
Located in Ulm, Germany
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I am writing this post to provide people who don't have access to Youtube videos with a quick overview of what Jeroen Ensink presented during the fourth webinar that SEI organised on 26 November (see Arno's post about it here: forum.susana.org/forum/categories/139-ge...mit=12&start=12#6564).
Jeroen’s presentation starts exactly here in the Youtube video:
(the total duration of presentation and Q&A session was 19 minutes)
New concepts for on-site sanitation based on bio-additives and pit design - the fundamentals of pit latrine research
by Jeroen Ensink who works at the London School of Hygiene and Tropical Medicine in London, UK
The powerpoint slides that he used:
Please log in or register to see it.
Notes that I took from his presentation:
- Their grant was a 5-year grant (ending next year) which included diverse work packages such as consumer demand studies, toilet designs, taking products to market, black solider fly work in South Africa, Tiger Toilet,.... In this presentation he focused on just one part of the research: the fundamentals of pit latrine research.
- The starting point for the research is: why do some pit latrines fill up fast (in 2-3 years) while others don’t fill up fast and rather last forever – if if all things are equal (i.e. same soil characteristics, same number of users, same diet, etc.)?
- They took the latrine fill-up rate (FUR) as the main indicator whether a pit latrine is performing “well” or not. This means a latrine that fills up fast is classified as not performing well. They found a variation in fill-up rate from around 0.25 L of faecal sludge per person per day to over 2 L/person/day.
- They selected 50 latrines in Vietnam and 50 in Tanzania (all in well draining soils) and followed them for 2 years (monitored use and management of the pit latrine). During this time they measured every 2 months with a laser reader the level in the pit.
- After 2 years, a core sample of the pit was taken and shipped to the UK. With this core sample many different parameters were analysed, for example the Sanger Institute in Cambridge did the microbial analyses (with 454 sequencing).
Questions from the audience:
(1)
Question by me: "I thought the most important parameter about a pit filling up fast or not are the soil characteristics and hydrogeological conditions. Is this not the case?"
Answer by Jeroen:
"We chose only latrines in free draining soils; we found that even if they are all in soils with the same characteristics, there are still signification differences in fill-up rates.”
(2)
Question by me: "There are many suppliers of pit additives. What questions would you ask them to find out if their product really works or not?"
Answer by Jeroen:
"We have tested all commercially available pit additives that we could get hold of together with the University of Kwa-Zulu Natal in South Africa (see also here on the forum: forum.susana.org/forum/categories/53-fae...dge-includes-em#1005). None of them worked! My question back to the supplier would be: what is in it? Most likely they won’t tell you though! (trade secret). Probably a mixture of different bacterial strains. The problem is that you first have to build up a large amount of bacteria before the biodegradation process can work; this will initially increase the biomass and make the pit fill up even faster initially. - We have worked with Novozyme in the US (a large enzyme company: www.novozymes.com/en/Pages/default.aspx). In the lab, we found with some strains a 15% (or 50%?) more rapid decomposition rate. In any case we have found that there are certain microbiota in well-performing pits.”
(3)
Questions by Daniel Yeh and Dorothee Spuhler: "Do you have data on diets and on user behaviour?"
Answer by Jeroen:
"Yes, we have a large database which we are analyzing statistically with the help of some statisticians at the University of Glasgow (we have 50,000 different variables). Our data base is huge. We can look at every parameter and can control for any variable. We have data on use patterns, diet and so forth. Our problem is that the diet in rural Tanzania is so uniform (rice and beans all the time, with some maize), so we cannot look at different factors there. The data from Vietnam might give us more insight, as the diet is more varied there.”
(4)
Question by Marc Deshusses: "Have you looked at parameters such as pH, nitrogen content, ammonium and their correlation with biogas production?"
Answer by Jeroen:
"Yes and we have found that the key parameter for good performance is the moisture content, which needs to be in the right range (not too wet and not too dry). Also phosphates help in good performing pit latrines; pH and temperature also play a role.”
(Alison Parker mentioned in the chat field: “We are about to publish a review which correlates diet and demographics to faeces characteristics.”)
(5)
Question by Laura Talsma: "Do you have data on calorific value of the pit content? Can we access all your data on faecal sludge characteristics, will you share it?"
Answer by Jeroen:
"No, we did not measure the calorific value. We will publish a paper in about 2 months with many of the results that I mentioned. “
Alison Parker mentioned in the chat field: “We have data on calorific values from pits in Zambia (EPSRC funded)- EPSRC is the Engineering and Physical Sciences Research Council. The project is this one: transformingwasteproject.com/.”
Marc Deshusses was also interested in the calorific data and said they found a big spread in the values for faecal sludge in South Africa. They hope to find it to be above 12 MJ/kg. Laura Talsma said they are doing calorific tests of the waste collected by Sanergy in Kenya.
In his closing statement, the moderator Nelson Ekane said: How do plastics and pads from menstrual hygiene management affect the biodegradability in the pits? Something we could discuss on the forum. (I would guess that plastic waste is probably a hindrance in biodegradation of the organic matter because it gets in the way, prevents mixing and moisture transfer and alike)
If anyone has further questions or comments, then please put them here by replying to this post.
Thank you again to Jeroen for giving this presentation and for answering our questions!
Regards,
Elisabeth
P.S. Their project website is this: www.sanitationventures.com (currently not very up to date but Jeroen said he is in the process of updating it).
Freelance consultant on environmental and climate projects
Located in Ulm, Germany
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My Wikipedia user profile: en.wikipedia.org/wiki/User:EMsmile
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You need to login to replyIf you have been following this discussion and are interested in hearing more about the project on new concepts for on-site sanitation based on bio-additives and pit design led by London School of Hygiene and Tropical Medicine please join the upcoming live webinar.
The webinar, hosted by SEI, will take place on Tuesday 26 November 2013, 16:30 - 17:15 (CET – Sweden time), and will give you an opportunity to interact with Jeroen (and two other grantees). For more details how to participate (with or without microphone rights) please see here:
forum.susana.org/forum/categories/139-ge...nment-institute#6427
If you miss the live event, the recording will be provided a few days after the webinar.
Best regards,
Kim
Stockholm Environment Institute
Postbox 24218,104 51 Stockholm, Sweden
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Re: AW: WG: Sanitation Updates
The following link is to a journal paper which we published in July and which is an output of our BMGF funded project.
best regards
Jeroen
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sanitationupdates.wordpress.com/2013/07/...tion-to-fly-catches/
Characteristics of latrines in central Tanzania and their relation to fly catches
PLoS One. 2013 Jul 18;8(7).
This is an open access journal. The full text of the paper is available here:
www.plosone.org/article/info%3Adoi%2F10....journal.pone.0067951
Authors: Irish S, Aiemjoy K, Torondel B, Abdelahi F, Ensink JH.
Abstract:
The disposal of human excreta in latrines is an important step in reducing the transmission of diarrhoeal diseases. However, in latrines, flies can access the latrine contents and serve as a mechanical transmitter of diarrhoeal pathogens. Furthermore, the latrine contents can be used as a breeding site for flies, which may further contribute to disease transmission. Latrines do not all produce flies, and there are some which produce only a few, while others can produce thousands. In order to understand the role of the latrine in determining this productivity, a pilot study was conducted, in which fifty latrines were observed in and around Ifakara, Tanzania.
The characteristics of the latrine superstructure, use of the latrine, and chemical characteristics of pit latrine contents were compared to the numbers of flies collected in an exit trap placed over the drop hole in the latrine. Absence of a roof was found to have a significant positive association (t=3.17, p=0.003) with the total number of flies collected, and temporary superstructures, particularly as opposed to brick superstructures (z=4.26, p<0.001), and increased total solids in pit latrines (z=2.57, p=0.01) were significantly associated with increased numbers of blowflies leaving the latrine. The number of larvae per gram was significantly associated with the village from which samples were taken, with the largest difference between two villages outside Ifakara (z=2.12, p=0.03). The effect of latrine superstructure (roof, walls) on fly production may indicate that improvements in latrine construction could result in decreases in fly populations in areas where they transmit diarrhoeal pathogens.
Photo of drop-hole modification and trap placement:
Black plastic construction tape and nails were used to adapt the drop-hole and cover other potential exit points (Figure 1). Households were instructed on how to remove and replace the trap when they need to use the latrine. After 24 hours the traps were collected. The traps were transported back to the laboratory and frozen in a -20 °C freezer for 45 minutes to kill the flies. Flies were identified to the family level [15]. All specimens were preserved in ethanol (70% dilution). Each latrine suitable for fly trapping (n=42) was trapped once between July 7 and August 3, 2011.
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You need to login to replyRe: On-site sanitation based on bio-additives and pit design (LSTH, UK and Tanzania, South Africa and Vietnam)
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So I can see there is not any type of rocket science involved, joust general common sense. More or less the same groundwater related effluent discharge pre-consideration are in-place by our local standards in Germany too.
I am just wondering how this general common sense will be put in place by possible upcoming businesses minded ordinary sanitation entrepreneurs in general, as I know even specialist here in Germany get mixed up too.
I guess you have to allow percentages of wrong implementations. Real 100% perfections are not possible in this local-global world... C’est la vie
Best Regards,
Detlef SCHWAGER
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- Sanitation systems
- Treatment of wastewater, sludges, organic waste, excreta
- Septic tanks (conventional or upgraded)
- On-site sanitation based on bio-additives and pit design (LSTH, UK and Tanzania, South Africa and Vietnam)