Search found 302 matches
- Tue Feb 03, 2009 11:26 am
- Forum: Anaerobic Digester
- Topic: using aerobic process to heat anerobic digester?
- Replies: 2
- Views: 20935
Re: using aerobic process to heat anerobic digester?
Idea 1: ...will the air kill the anaerobic bacteria Yes. It could also make a dangerous, potentially explosive fuel/air mixture. You don't want to do that. Your Idea 2 sounds too complicated and expensive. (I would use all the organic material I had available to make biogas from, and focus my effor...
- Sat Jan 31, 2009 3:29 pm
- Forum: Anaerobic Digester
- Topic: water re-use
- Replies: 1
- Views: 18601
Re: water re-use
Your operation sounds like it might better lend itself to a batch feed or hybrid system, rather than the continuous feed design I have described here. The US EPA AgSTAR Handbook and Software provides the information you will need.
- Sat Jan 31, 2009 3:23 pm
- Forum: Anaerobic Digester
- Topic: Stable waste
- Replies: 1
- Views: 18513
Re: Stable waste
Yes. A good source of information for farm-scale operations can be found at US EPA's website. In particular, check out their handbook and FarmWare software.
- Thu Jan 29, 2009 11:30 am
- Forum: Anaerobic Digester
- Topic: Energy indepentend home
- Replies: 11
- Views: 43813
Re: Energy indepentend home
True. If you can maintain the temperature and the pH you should be good. There are a number of inexpensive pH meters on the market that would be handier than pH paper.As long as it is producing methane, then there is really no need to know everything.
- Thu Jan 29, 2009 10:38 am
- Forum: Anaerobic Digester
- Topic: Green waste
- Replies: 1
- Views: 18355
Re: Green waste
Yes. It sounds like a good feedstock. The fact that it has already started to rot should be a benefit.
- Wed Jan 28, 2009 4:48 pm
- Forum: Anaerobic Digester
- Topic: Energy indepentend home
- Replies: 11
- Views: 43813
Re: Energy indepentend home
Also, do you know where you can get some monitoring equipment, to monitor temperature,ph,co2,methane,and hydrogen sulfide? The short answer is yes. The longer answer would depend on how much you want to spend, how frequently you want to record the data, and how much you want to do manually vs autom...
- Tue Jan 27, 2009 6:07 pm
- Forum: Anaerobic Digester
- Topic: Energy indepentend home
- Replies: 11
- Views: 43813
Re: Energy indepentend home
Hi David, No time for more than a fly-by, but here's a link that has some good info on feedstocks and gas production. And David House's Biogas Handbook has this: Buswell [says]… “the present estimate is that from 5 to 10 cubic feet of gas can be obtained per pound of cornstalks, and that the rate of...
- Tue Jan 27, 2009 1:20 pm
- Forum: General Catchall
- Topic: alternative ventilation system
- Replies: 1
- Views: 16724
Re: alternative ventilation system
Are there any recent changes or results from your implementation of the design in Bristol Bay or elsewhere? Yes. We ended up abandoning the idea after installing it in about 20+ houses in 3 different villages, over a couple of years. But, that said, all of the problems had to do with site specific ...
- Fri Jan 16, 2009 11:12 am
- Forum: Anaerobic Digester
- Topic: Energy indepentend home
- Replies: 11
- Views: 43813
Re: Energy independent home
1- What would be the best crop to grow? That's probably a location-specific question, David. Rather than grow a crop specifically for fuel, you might consider feeding your digester agricultural 'waste' from other (perhaps more valuable) crops? Are you near an urban center -- like where people rake ...
- Thu Jan 08, 2009 2:42 pm
- Forum: Anaerobic Digester
- Topic: Homebuild digester and the pitfalls..
- Replies: 7
- Views: 35815
Re: Homebuild digester and the pitfalls..
...when paper is anaerobically digested it produces 4 times its paper weight in methane gas.. Is there any truth to this? Would you recommend putting shredded paper into an anaerobic digester? I don't know about the weight of gas per weight of feedstock, but it can be calculated from basic chemistr...
- Fri Jan 02, 2009 6:26 pm
- Forum: Anaerobic Digester
- Topic: Homebuild digester and the pitfalls..
- Replies: 7
- Views: 35815
Re: Homebuild digester and the pitfalls..
how do you keep the toilets clean? We used Shaklee products for years, until our local distributor moved away. After that we were able to find various other benign off-the-shelf products. But you're right. We didn't use bleach. Here is a photo of a 4-digester test setup I built recently, to test th...
- Thu Jan 01, 2009 7:06 pm
- Forum: Anaerobic Digester
- Topic: Homebuild digester and the pitfalls..
- Replies: 7
- Views: 35815
Re: Homebuild digester and the pitfalls..
Hi Mathew, I think I'd start by trying to get a rough estimate of quantities of waste and gas you can produce. Based on the quantities you describe (toilet wastes from a single family residence, a few chickens and some glycerol) I'd guess you probably can't generate enough gas to justify the cost of...
- Tue Dec 23, 2008 12:23 pm
- Forum: Anaerobic Digester
- Topic: Haiti Orphan Schoold electricity
- Replies: 1
- Views: 18825
Re: Haiti Orphan School electricity
Hi Lou,
Here is a digester design from Francisco X. Aguilar that may be suitable for your application. It is simple, minimum cost, and suitable for tropical environment. Little more than a polyethylene bag in a pit in the ground.
Hope this helps...
Here is a digester design from Francisco X. Aguilar that may be suitable for your application. It is simple, minimum cost, and suitable for tropical environment. Little more than a polyethylene bag in a pit in the ground.
Hope this helps...
- Mon Dec 15, 2008 1:18 pm
- Forum: Anaerobic Digester
- Topic: digester for suburban community
- Replies: 3
- Views: 22628
Re: digester for suburban community
1) Once we have obtained the gas, how do we purify it to determine how much is methane and how much is CO2? You can scrub the CO2 from the biogas by bubbling it through limewater. H2S can be removed by filtering it through steel wool. That said, I think most people don't bother -- at least not for ...
- Fri Dec 12, 2008 10:51 am
- Forum: Anaerobic Digester
- Topic: Biomass Calulator
- Replies: 1
- Views: 18306
Re: Biomass Calulator
The calculator is based on continuous feed. The inputs are per day.
- Fri Dec 12, 2008 10:46 am
- Forum: Anaerobic Digester
- Topic: BIOGAS PLANT INFO
- Replies: 1
- Views: 18307
Re: BIOGAS PLANT INFO
Hola Fernando,
Are you familiar with the USEPA's Agstar program? They have some design software and a comprehensive handbook free for downloading, that may fit your application better than my smaller scale stuff.
http://www.epa.gov/agstar/resources.html
Are you familiar with the USEPA's Agstar program? They have some design software and a comprehensive handbook free for downloading, that may fit your application better than my smaller scale stuff.
http://www.epa.gov/agstar/resources.html
- Fri Dec 12, 2008 10:35 am
- Forum: Anaerobic Digester
- Topic: digester for suburban community
- Replies: 3
- Views: 22628
Re: digester for suburban community
Hi Drew, I've played with the calculator a little bit but haven't been able to figure it out. It is based on a continuous feed design. The inputs (on the left side) are what would be added on a daily basis. Enter the estimated daily quantity of each feedstock, adjust the mixture till you get an appr...
- Fri Nov 28, 2008 11:03 am
- Forum: Anaerobic Digester
- Topic: saving the world and other fun stuff...
- Replies: 30
- Views: 104844
Re: saving the world and other fun stuff...
Did you see the stuff I added to the R&D Forum?
- Thu Nov 20, 2008 2:18 pm
- Forum: Anaerobic Digester
- Topic: saving the world and other fun stuff...
- Replies: 30
- Views: 104844
Re: saving the world and other fun stuff...
Glad to see you able to pick this back up, Nathan. I'll look forward to seeing what new information you find. And I would love to see it move forward -- like find some funding to build a prototype, test feasibility? For myself, I'm spread a mile wide and an inch deep. Too many projects, just trying ...
- Wed Nov 19, 2008 12:14 pm
- Forum: Anaerobic Digester
- Topic: saving the world and other fun stuff...
- Replies: 30
- Views: 104844
Re: saving the world and other fun stuff...
Good deal!
How goes your world?
How goes your world?