Jaime has suggested baking/brewing yeast (is there a big difference?). There must be a way to keep the bacteria alive in the digester effluent, while also reducing the effluent volume and improving the portability. Maybe a combination of the two things? This seems like a useful area of inquiry. I did, however, assume that someone out there already had this nailed down...anyone else!?
Saludos, A On 9/29/10, Greg Austin <[email protected]> wrote: > Hi > > We have a similar problem here with our small digesters, and typically > use cow manure as a starter. We have also looked into the tablets, > and yes they are enzymes, and really don't do what's required. Sorry > not to be able to offer a solution, but hope someone else can provide > ideas?! > > Regards > > -- > > Greg Austin > AGAMA Biogas (Pty) Ltd > T +27 21 7013364 > F +27 21 7024920 > E [email protected] > W www.agama.co.za > W www.biogaspro.com > > On 29 Sep 2010, at 4:47 AM, [email protected] > wrote: > >> Send Digestion mailing list submissions to >> [email protected] >> >> To subscribe or unsubscribe via the World Wide Web, visit >> >> http://lists.bioenergylists.org/mailman/listinfo/digestion_lists.bioenergylists.org >> >> or, via email, send a message with subject or body 'help' to >> [email protected] >> >> You can reach the person managing the list at >> [email protected] >> >> When replying, please edit your Subject line so it is more specific >> than "Re: Contents of Digestion digest..." >> >> >> Today's Topics: >> >> 1. Re: Inoculation for Small Digesters (Marc de Piolenc) >> 2. Re: Costs of different household biodigesters (Eric Buysman) >> >> >> ---------------------------------------------------------------------- >> >> Message: 1 >> Date: Wed, 29 Sep 2010 10:44:58 +0800 >> From: Marc de Piolenc <[email protected]> >> To: For Discussion of Anaerobic Digestion >> <[email protected]> >> Subject: Re: [Digestion] Inoculation for Small Digesters >> Message-ID: <[email protected]> >> Content-Type: text/plain; charset=ISO-8859-1; format=flowed >> >> The tablets are probably enzymes, when what you need are the >> microorganisms that produced the enzymes. You may need to produce your >> own packaged inoculant, but if you succeed you may have a marketable >> product. Research is the first step; find out the techniques used in >> microbiological laboratories for culturing and preserving the >> organisms >> you need, then see if they all have a common preservation medium. >> >> Best, >> Marc de Piolenc >> Iligan City, Philippines >> >> Archivale catalog: http://www.archivale.com/catalog >> Polymath weblog: http://www.archivale.com/weblog >> Translation services: http://www.proz.com/profile/639380 >> Ducted fans: http://massflow.archivale.com/ >> >> On 9/29/2010 1:07 AM, Alexander Eaton wrote: >>> HI All, >>> >>> We have been doing our systems start (for small household scale >>> digesters) with the paunch waste from slaughterhouses, adding 50-100 >>> liters of the waste along with manure and water as an initial charge. >>> Transporting this waste (wet, heavy, and a bit nasty) is a bit of a >>> pain. My technicians keeping hinting at better incolculant >>> solutions, >>> and I would like to see if there is anyone out there making really >>> effective inoculates (or knows how to make them) that are dry, >>> simple to >>> apply, but really effective in starting a digester. Efficient and >>> fast >>> start-up is a really crucial aspect of technology adoptions, and >>> using >>> effluent from functioning digesters or the paunch waste has >>> produced the >>> best results for us as far as start-up rates. We have seen a brand >>> of >>> tablets for septic tanks, but we have not found them to improve >>> start-up >>> times as compared with straight manure. Thanks in advance. >>> >>> Saludos, >>> >>> A >>> >>> -- >>> Alexander Eaton >>> Sistema Biobolsa >>> IRRI-Mexico >>> >>> Mex cel: (55) 11522786 >>> US cel: 970 275 4505 >>> >>> [email protected] <mailto:[email protected]> >>> [email protected] <mailto:[email protected]> >>> sistemabiobolsa.com <http://sistemabiobolsa.com> >>> www.irrimexico.org <http://www.irrimexico.org> >>> >>> >>> >>> _______________________________________________ >>> Digestion mailing list >>> [email protected] >>> http://lists.bioenergylists.org/mailman/listinfo/digestion_lists.bioenergylists.org >> >> >> >> ------------------------------ >> >> Message: 2 >> Date: Tue, 28 Sep 2010 19:47:36 -0700 (PDT) >> From: Eric Buysman <[email protected]> >> To: For Discussion of Anaerobic Digestion >> <[email protected]> >> Subject: Re: [Digestion] Costs of different household biodigesters >> Message-ID: <[email protected]> >> Content-Type: text/plain; charset="iso-8859-1" >> >> Dear all, >> >> The investment costs (part paid by the farmer) in Cambodia are as >> follows: >> >> Plant size 4 m3 6 m3 8 m3 10 m3 15 m3 >> Estimated cost (USD)* 400 470 550 625 890 >> Subsidy (USD) 150 150 150 150 150 >> >> The digester model is a modified version of the Deenbandhu >> digester, a fixed >> dome digester. The digester have a 2 year warranty and last >> typically for 15-20 >> years. >> >> On top of that users receive a flat rate subsidy of $150, which >> originates from >> carbon finance. The program costs are, I believe, now $250 per >> biogas plants. >> This is a joint SNV- Cambodian government programme. >> >> In Vietnam the costs are almost 1 million VND per m3, that is around >> $50/m3 >> digester volume, on top of that farmers receive a flat rate $50 >> subsidy. Their >> digester model is based on the Chinese dome digester. >> >> Cheers, >> >> Eric >> >> >> >> >> >> ________________________________ >> From: Alexander Eaton <[email protected]> >> To: For Discussion of Anaerobic Digestion >> <[email protected] >> > >> Sent: Wed, September 29, 2010 7:48:18 AM >> Subject: Re: [Digestion] Costs of different household biodigesters >> >> HI All, >> >> We have reinforced polyethylene geomembrane digester in a variety of >> sizes that >> come as a "kit" with all connections, biogas reservoir, geo-textil >> ground liner, >> gas management systems with high pressure relief valve and filter, >> and simpler >> burner. The system can be installed in the ground or above ground, >> and the >> material has a 20 year guarantee. We service and guarantee the >> systems for two >> years, and offer low cost service for the life of the system >> (currently only in >> Mexico). There may be additional costs associated with a roof or >> greenhouse >> structure for the digester. Note that Jaime has also included the >> price of a >> greenhouse cover for the Bolivia systems, which many others leave >> out. Our >> intention is no use of concrete, but sometimes there is a bit of >> work needed to >> make the pig-pen or stable drain adequately to the digester. Retail >> prices (all >> in) are below, and the sizes refer to m3. We have made systems of 1 >> and 2 m3 >> for test purposes, but these are not much less expensive than that >> of 4 meters >> as the entrance and exits cost the same and our asembly labor is >> nearly the same >> as well (therefore larger systems are less expensive per m3). From >> these prices >> we offer discounts for good programs, low income families, and for >> higher >> quantities purchased. >> >> >> >> Bolsa Sizes Costo (MXN) Costo (US$) >> 4 $9,292 $743 >> 8 $12,802 $1,024 >> 12 $16,312 $1,305 >> 16 $19,823 $1,586 >> 20 $20,515 $1,641 >> 30 $28,813 $2,305 >> >> We also built a lot of regular plastic digesters in the style of Jaime >> (Taiwanese or Preston Digester), and the costs in Mexico (same >> components, >> double layer bag), were only about 10-20% lower. This is higher >> than Jaime has >> shown, which could be because of higher material prices in Mexico. >> >> >> For SNV's program in Africa, their prices for the concrete dome >> digesters were >> nearly identical for those I listed above. We are quite a bit >> cheaper overall >> as our system requires only a couple hours (one technician installs >> 3 per day) >> versus a week of construction. Also, our materials prices are much >> cheaper at >> higher volumes. >> >> >> It is important to note that it can be very misleading to state >> "costs" for >> these types of systems. These sorts of speculations often seem to >> project the >> idea that someone is building the system in their backyard, and >> therefore it is >> appropriate to externalize many of the costs. When installing the >> "appropriate >> tech" style bag digester, there are a few days of installation >> preparation, plus >> acquisition of materials, etc. Just pulling off the price tag of >> the materials >> often does not appropriately encapsulate the full cost of the >> installation. >> This tends to set up false expectations to those who would like to >> promote the >> technology, or when a government wants to spend to have them >> installed. I >> beleive (please comment Jaime) that the Bolivia program has a >> subsidy in place >> for installation, transport, and labor, which is crucial to >> consider. The >> families are also required to supply certain materials and labor for >> the >> installation. >> >> >> I also have a full study of Life Cycle Costs, which is arguably a >> better measure >> of the cost of a system that you want to last a long time. With a >> longer >> projected life span (and repairability), geomembrane digesters were >> about 40% >> less expensive over a 10 year span than lower quality plastic >> systems. Dome >> digester tend to hold their value longer in some cases, but there is >> a higher >> abandonment rate due to slow gas leaks that reduce end user >> satisfaction. >> >> >> Saludos, >> >> A >> >> >> >> On Tue, Sep 28, 2010 at 6:03 PM, Jaime Marti Herrero >> <[email protected] >> > >> wrote: >> >> Hi >>> plugflow digester made of tubular polyethilene cost in Bolivia: >>> -For cold climate : 230 us$ with 6.5m3 of liquid volume, green >>> house, three >>> biogas reservoirs, and one bunner >>> -For valley climate: 185 us$ with 3,5m3 of liquid volume, 66% sun >>> cover, two >>> biogas reservoirs and one bunner >>> -For tropical climate 168 us$ witk 3 m3 of liquid volume, 66% sun >>> cover, two >>> biogas reservoirs and one bunner >>> all of are load with 20kg of fresh cow manure and 60 liters of >>> water per day, >>> producing about 700 liters of biogas per day. >>> >>> We have done 1m3 tubular polyethilene digester for research >>> considerations using >>> 2m circunference plastic and 4,8 meters long. i dont have the cost >>> because a >>> plastic factory donate this material to our laboratory. >>> >>> i hope this helps >>> keep in touch >>> jaime >>> ----- >>> Jaime Mart? Herrero >>> >>> >>> Technical advisor of biogas for the GTZ-Bolivia >>> CIMNE (www.cimne.com) >>> Building Energy and Environment Group >>> International research cooperation area >>> La Paz ? Bolivia >>> Tel. (+591)-73 090 621 >>> >>> >>> BIOGAS AND BOLIVIA >>> -Taller Biogas Bolivia >>> http://tallerbiogas.blogspot.com >>> -Video: Biodigester installation in bolivian Altiplano >>> http://es.youtube.com/watch?v=3Sl0XEN5Bgo >>> http://www.youtube.com/watch?v=Vs0JuV8WD_c >>> -Manual gratuito-Biodigestores familiares: Gu?a de dise?o y manual de >>> instalaci?n >>> http://www.upc.edu/grecdh/pdf/2008_JMH_Guia_biodigestores.pdf >>> >>> >>> >>> >>> ________________________________ >> Date: Tue, 28 Sep 2010 10:50:06 -0700 >>> From: [email protected] >>> >>> To: [email protected] >>> Subject: [Digestion] Costs of different household biodigesters >>> >>> >>> Hi all, >>> >>> I would like to know if anyone knows or have a good estimate of the >>> cost of the >>> following small scale biodigesters: >>> >>> 1- Plug-flow polyethylene biodigester type (like the ones in >>> Bolivia) (between >>> 1-10 m3).... I don't know if it's possible to build one with such >>> small size >>> like 1m3 >>> 2- Chinese fixed-dome (between 1m3-10 m3) >>> 3- ARTI type biodigester (1-2 m3) >>> >>> Thanks, >>> >>> Ivo Oliveira >>> >>> _______________________________________________ Digestion mailing >>> list >>> [email protected] >>> http://lists.bioenergylists.org/mailman/listinfo/digestion_lists.bioenergylists.org >>> >>> _______________________________________________ >>> Digestion mailing list >>> [email protected] >>> http://lists.bioenergylists.org/mailman/listinfo/digestion_lists.bioenergylists.org >>> >>> >>> >> >> >> -- >> Alexander Eaton >> Sistema Biobolsa >> IRRI-Mexico >> >> Mex cel: (55) 11522786 >> US cel: 970 275 4505 >> >> [email protected] >> [email protected] >> sistemabiobolsa.com >> www.irrimexico.org >> >> >> -------------- next part -------------- >> An HTML attachment was scrubbed... >> URL: >> <http://lists.bioenergylists.org/pipermail/digestion_lists.bioenergylists.org/attachments/20100928/3ff167db/attachment.html >> >> > >> >> ------------------------------ >> >> _______________________________________________ >> Digestion mailing list >> [email protected] >> http://lists.bioenergylists.org/mailman/listinfo/digestion_lists.bioenergylists.org >> >> >> End of Digestion Digest, Vol 1, Issue 17 >> **************************************** > > -- Sent from my mobile device Alexander Eaton Presidente Sistema Biobolsa Mex cel: (55) 11522786 US cel: 970 275 4505 [email protected] [email protected] sistemabiobolsa.com www.irrimexico.org _______________________________________________ Digestion mailing list [email protected] http://lists.bioenergylists.org/mailman/listinfo/digestion_lists.bioenergylists.org
