SuSanA - Forum Kunena Site Syndication http://forum.susana.org/ Thu, 28 May 2015 03:58:34 +0000 Kunena 1.6 http://forum.susana.org/components/com_kunena/template/default/images/icons/rss.png SuSanA - Forum http://forum.susana.org/ en-gb Re: Lessons Learned from the Dissemination of Biodigesters for Sanitation in Haiti, from 2010 to 2013 - by: kellne http://forum.susana.org/forum/categories/35-biogas-sanitation-systems-and-dewats/11396-lessons-learned-from-the-dissemination-of-biodigesters-for-sanitation-in-haiti-from-2010-to-2013#13465 http://forum.susana.org/forum/categories/35-biogas-sanitation-systems-and-dewats/11396-lessons-learned-from-the-dissemination-of-biodigesters-for-sanitation-in-haiti-from-2010-to-2013#13465
Thanks for your contribution and for remembering our good discussion in Vietnam.
Please contact me on This e-mail address is being protected from spambots. You need JavaScript enabled to view it if you wold like to know details referring to my biogas experience in developing countries.

Looking forward

Regards from Arusha, Tanzania

Christopher,

Thanks, Elisabeth to encourage me to become active here in this forum.]]>
Biogas sanitation systems and DEWATS Thu, 28 May 2015 03:55:33 +0000
Re: Lessons Learned from the Dissemination of Biodigesters for Sanitation in Haiti, from 2010 to 2013 - by: pkjha http://forum.susana.org/forum/categories/35-biogas-sanitation-systems-and-dewats/11396-lessons-learned-from-the-dissemination-of-biodigesters-for-sanitation-in-haiti-from-2010-to-2013#13458 http://forum.susana.org/forum/categories/35-biogas-sanitation-systems-and-dewats/11396-lessons-learned-from-the-dissemination-of-biodigesters-for-sanitation-in-haiti-from-2010-to-2013#13458
Thanks for the information. I have gone through your presentation at FSM 3 and other posts.
Rate of biogas production from human wastes is, on an average, one cubic foot ( 0.03 cum) per person per day. That is, from a family having 5 members using a toilet, only 5 cft biogas will produce per day. One cooking burner consumes 17-18 cft of biogas per hour. Therefore, produced biogas is not enough to meet the requirement of cooking daily. One can use biogas for cooking purpose maximum 6-7 days a month, when biogas plant is fed only with human excreta. Therefore . it is not economically sustainable.
Your photographs of biogas plant in slides appear to be too large size. However, its capacity or size or number of users of toilets are not mentioned. Unnecessary larger size of biogas plant makes it further uneconomical.
Toilet linked biogas plant should be based on mixed feed. Animal waste and / kitchen wastes should be mixed to get higher biogas production. Based on my experimental observation, there is additive effect on biogas production, when human excreta is mixed with animal dung or kitchen waste in the digester.
A few hundreds of toilet linked biogas plants in one district in India have been installed last year. Utilisation rate of biogas by families is 100%. No any family is using LPG or any other fuel for cooking except biogas. All the biogas plants are based on mixed feed- human excreta with animal dung.Only 17-18 kg of animal dung is required to produce enough biogas to meet the cooking requirement of a family. You can find detail of the biogas and its utilisation in the book - Technological options for solid and liquid waste management, in the last chapter. Linke of the book is--mdws.gov.in/sites/upload_files/ddws/file...id_Waste_%28E%29.pdf

Regards
Pawan]]>
Biogas sanitation systems and DEWATS Wed, 27 May 2015 02:58:49 +0000
Re: Lessons Learned from the Dissemination of Biodigesters for Sanitation in Haiti, from 2010 to 2013 - by: muench http://forum.susana.org/forum/categories/35-biogas-sanitation-systems-and-dewats/11396-lessons-learned-from-the-dissemination-of-biodigesters-for-sanitation-in-haiti-from-2010-to-2013#13445 http://forum.susana.org/forum/categories/35-biogas-sanitation-systems-and-dewats/11396-lessons-learned-from-the-dissemination-of-biodigesters-for-sanitation-in-haiti-from-2010-to-2013#13445 youtu.be/R0W_ahWOgic?t=22m20s

Or jump to time: 22m20s in this video:



The question and answer session starts here:

youtu.be/R0W_ahWOgic?t=43m6s

I recommend checking out the question and answer session. Anthony got one question/comment by Doulaye Kone (Gates Foundation) and one question/comment by Christopher Kellner. Very interesting stuff about biogas in general and how to make it work in a country in particular.

Regards,
Elisabeth]]>
Biogas sanitation systems and DEWATS Tue, 26 May 2015 13:15:18 +0000
Are there any issues with anaerobic digestion of faecal sludge? - by: vishwanathdalvi http://forum.susana.org/forum/categories/35-biogas-sanitation-systems-and-dewats/13172-are-there-any-issues-with-anaerobic-digestion-of-faecal-sludge#13172 http://forum.susana.org/forum/categories/35-biogas-sanitation-systems-and-dewats/13172-are-there-any-issues-with-anaerobic-digestion-of-faecal-sludge#13172
We are designing a waterless toilet at the Institute of Chemical Technology, Mumbai. An important consideration is disposal of the concentrated feces+urine.

We are seriously considering using an anaerobic digester using the Dedko digester technology developed by Flycatcher Technologies (flycatchertech.weebly.com/).

We would really appreciate any heads up about potential pitfalls of anaerobic digesters especially when urine is added straight to the digester.]]>
Biogas sanitation systems and DEWATS Sun, 03 May 2015 14:12:23 +0000
Re: ABR-CW quick sizing tool - by: dmrobbins10 http://forum.susana.org/forum/categories/35-biogas-sanitation-systems-and-dewats/12962-abr-cw-quick-sizing-tool#13150 http://forum.susana.org/forum/categories/35-biogas-sanitation-systems-and-dewats/12962-abr-cw-quick-sizing-tool#13150
The first is a simple Excel tool that provides some rough design ideas. In this tool the strength of the wastewater is adjusted by adjusting the storage factor (see instructions at the bottom of page 1 of the tool). It uses 1.35 for a storage factor for residential strength wastewater, 1.8 - 2.4 for medium strength wastewater typical of a public market or hospital, and 2.5 - 3.5 for high strength.

The second is a constructed wetlands toolkit developed some years ago by the Bohal Environmental Management Office (BEMO) in the Philippines. This one is modeled using Reeds method. Pay special attention to the hydraulic conductivity of the media, as this has a big impact upon the overall sizing.

To my knowledge both of these have not been vetted by "professional" engineers and should be used with caution, and for discussion only, and not as a substitute for real engineering. It would be good to know if you find these useful or at least interesting.

Best,

Dave Robbins
This e-mail address is being protected from spambots. You need JavaScript enabled to view it ]]>
Biogas sanitation systems and DEWATS Fri, 01 May 2015 06:29:11 +0000
Re: ABR-CW quick sizing tool - by: AquaVerde http://forum.susana.org/forum/categories/35-biogas-sanitation-systems-and-dewats/12962-abr-cw-quick-sizing-tool#13106 http://forum.susana.org/forum/categories/35-biogas-sanitation-systems-and-dewats/12962-abr-cw-quick-sizing-tool#13106
Keep your self on very conservative side, e.g. use average temperature of colder season of possible location to design an "improved pre-treatment" (ABR) in front of CW.
Keep Up-flow velocity in ALL ABR-cambers less them 1 m/h!!! Especial if you do your first ABR-trail, do not reduce 40% CW-m2 as recommended in a GIZ/GTZ-paper. You may start very conservative with max. 10% reduction... without "wishful thinking" .

I have all different versions of BORDA's Excel used, I found them very cumbersome. They need further developments in my opinion. By the way, Prof. Otterpohl developed this "tropical"-Excel together with Mr. Sasse many years ago! E.g. in Moldavia one ABR for 30 m3/d been designed, I regret 1/2 the size necessary with BORDA's "tropical"-Excel without real practical ABR-experiences! I by my self ended up using just "common sense" & only pocket calculator for our cold climate conditions in Germany, just to keep on the save side...
see picture in German language:




Good luck
Detlef]]>
Biogas sanitation systems and DEWATS Wed, 29 Apr 2015 07:25:30 +0000
Reply: RE: Biogas Sanitation Systems Designs - by: basangreen http://forum.susana.org/forum/categories/35-biogas-sanitation-systems-and-dewats/12993-re-biogas-sanitation-systems-designs#13068 http://forum.susana.org/forum/categories/35-biogas-sanitation-systems-and-dewats/12993-re-biogas-sanitation-systems-designs#13068
If you have simple household related design digestor, please share with us

rgs, Prof.Basandorj

Mongolia]]>
Biogas sanitation systems and DEWATS Sun, 26 Apr 2015 07:15:05 +0000
Re: ABR-CW quick sizing tool - by: Marijn Zandee http://forum.susana.org/forum/categories/35-biogas-sanitation-systems-and-dewats/12962-abr-cw-quick-sizing-tool#13062 http://forum.susana.org/forum/categories/35-biogas-sanitation-systems-and-dewats/12962-abr-cw-quick-sizing-tool#13062
Thanks, I was aware of the DEWATS booklet by Sasse, et al. I find a bit unfortunate that they presented the formulas used in the spreadsheets as EXCEL code, rather than as the formulas they used to base the Excel code on.

Probably, a lot of the formulas that were used for this booklet are still valid. Though for colder climates some parameters (such as up flow speed)may have to be adjusted.

Regards

Marijn]]>
Biogas sanitation systems and DEWATS Sat, 25 Apr 2015 03:36:47 +0000
Re: Reply: RE: Biogas Sanitation Systems Designs - by: pkjha http://forum.susana.org/forum/categories/35-biogas-sanitation-systems-and-dewats/12993-re-biogas-sanitation-systems-designs#13051 http://forum.susana.org/forum/categories/35-biogas-sanitation-systems-and-dewats/12993-re-biogas-sanitation-systems-designs#13051 There are several information available on toilet linked biogas plants. I also implemented a few hundred such toilets.
If you require any specific information, you can post.
regards

pawan]]>
Biogas sanitation systems and DEWATS Fri, 24 Apr 2015 11:07:31 +0000
Re: ABR-CW quick sizing tool - by: jankn http://forum.susana.org/forum/categories/35-biogas-sanitation-systems-and-dewats/12962-abr-cw-quick-sizing-tool#13048 http://forum.susana.org/forum/categories/35-biogas-sanitation-systems-and-dewats/12962-abr-cw-quick-sizing-tool#13048 Exactly, the formulas are there in the book, but the Excel files are not available for general use (as far as I know).
I have seen those Excel files being used by BORDA colleagues; but you are right, a word of caution might be advised. Given that the original book has been published nearly 20 years ago now, I am certain that these calculations have been updated based on more recent findings and regional experiences with different design parameters. However, they can still serve as a starting point (!) for dimensioning DEWATS modules (namely Settler, a modified septic tank or ST; Imhoff tanks, biogas settlers or BGS, ABR, AF, PGF, and polishing pond or PP - to add some more abbreviations to the list), but final design should be reviewed by experienced regional experts.
Best
/Jan]]>
Biogas sanitation systems and DEWATS Fri, 24 Apr 2015 09:56:46 +0000
Re: ABR-CW quick sizing tool - by: muench http://forum.susana.org/forum/categories/35-biogas-sanitation-systems-and-dewats/12962-abr-cw-quick-sizing-tool#13047 http://forum.susana.org/forum/categories/35-biogas-sanitation-systems-and-dewats/12962-abr-cw-quick-sizing-tool#13047 Just to answer your question from 19 April quickly: yes "hab." is the abbreviation for habitant or user. Let me add that to our list of abbreviations: en.wikipedia.org/wiki/Wikipedia:WikiProj...iations_and_acronyms


Hi Jan,
Are those Excel files available for general use? I guess not, as perhaps in the hands of non-experts they do more harm than they do good? (I think this was one of the reasons for BORDA in the past to not make such Excel files available). Just wondering.

Regards,
Elisabeth]]>
Biogas sanitation systems and DEWATS Fri, 24 Apr 2015 09:42:17 +0000
Re: ABR-CW quick sizing tool - by: jankn http://forum.susana.org/forum/categories/35-biogas-sanitation-systems-and-dewats/12962-abr-cw-quick-sizing-tool#13046 http://forum.susana.org/forum/categories/35-biogas-sanitation-systems-and-dewats/12962-abr-cw-quick-sizing-tool#13046
http://www.sswm.info/sites/default/files/reference_attachments/SASSE%201998%20DEWATS%20Decentralised%20Wastewater%20Treatment%20in%20Developing%20Coun]]>
Biogas sanitation systems and DEWATS Fri, 24 Apr 2015 09:09:06 +0000
Reply: RE: Biogas Sanitation Systems Designs - by: fmunthali http://forum.susana.org/forum/categories/35-biogas-sanitation-systems-and-dewats/12993-re-biogas-sanitation-systems-designs#13030 http://forum.susana.org/forum/categories/35-biogas-sanitation-systems-and-dewats/12993-re-biogas-sanitation-systems-designs#13030
Fredrick Munthali]]>
Biogas sanitation systems and DEWATS Wed, 22 Apr 2015 16:48:23 +0000
Re: RE: Biogas Sanitation Systems Designs - by: Marijn Zandee http://forum.susana.org/forum/categories/35-biogas-sanitation-systems-and-dewats/12993-re-biogas-sanitation-systems-designs#12994 http://forum.susana.org/forum/categories/35-biogas-sanitation-systems-and-dewats/12993-re-biogas-sanitation-systems-designs#12994
This is a recurring topic. See for example this discussion:

forum.susana.org/forum/categories/171-fo...rience-in-this-field

If you use the search function (right top of the screen), you will find more discussions on the topic. I would recommend reading those. If you have more specific questions after that, please feel free to ask.

This is also a good resource:

www.susana.org/en/resources/library/details/877

Regards

Marijn]]>
Biogas sanitation systems and DEWATS Mon, 20 Apr 2015 14:51:11 +0000
RE: Biogas Sanitation Systems Designs - by: fmunthali http://forum.susana.org/forum/categories/35-biogas-sanitation-systems-and-dewats/12993-re-biogas-sanitation-systems-designs#12993 http://forum.susana.org/forum/categories/35-biogas-sanitation-systems-and-dewats/12993-re-biogas-sanitation-systems-designs#12993 We would there like to learn lessons from those who have successfully implemented such toilets. Would also anyone provide me with suitable designs for the same so that we can compare with what we are developing.
Any assistance rendered will be greatly appreciated.

Fredrick Munthali]]>
Biogas sanitation systems and DEWATS Mon, 20 Apr 2015 14:34:17 +0000