Search found 302 matches

by Bob
Sun Oct 06, 2002 7:41 am
Forum: Anaerobic Digester
Topic: saving the world and other fun stuff...
Replies: 30
Views: 69734

OK, it sounds like what you want to do is to determine the ultimate digestibility of your feedstock -- leaving aside digester design questions for now. That would lend itself to a batch feed process, where you take a measured quantity (& analysis) of feedstock, put it in your reactor (e.g. 2 liter b...
by Bob
Fri Oct 04, 2002 11:21 am
Forum: Anaerobic Digester
Topic: saving the world and other fun stuff...
Replies: 30
Views: 69734

What are your goals, Nathan? I can think of so many possibilities, ranging from basic interest in anaerobic digestion in general, to rigorous testing & measurement of specific feedstocks, feedrates (retention times), design geometry (e.g. single vs. 2-stage) etc. If you are specifically interested i...
by Bob
Fri Oct 04, 2002 10:32 am
Forum: Anaerobic Digester
Topic: saving the world and other fun stuff...
Replies: 30
Views: 69734

How simple can this be? Could we just get some airtight 5 gallon pails with a spigot to a balloon to capture gas for the container? How about using some 2-liter plastic soda bottles? Put them in a heated water bath -- cheap styrofoam cooler filled with water with aquarium heater set to 95degF. At t...
by Bob
Fri Sep 27, 2002 6:56 am
Forum: Bioshelter
Topic: Direct Action...
Replies: 1
Views: 11739

Thanks, Jeff. I checked out your link, will look deeper when I can. Looks good.
by Bob
Tue Sep 24, 2002 4:25 pm
Forum: Anaerobic Digester
Topic: saving the world and other fun stuff...
Replies: 30
Views: 69734

(reply cross-posted from email) Most interesting. On the surface, it seems like a viable idea. I believe it would be quite feasible to digest straw & chaff (wihout actually having done so). The lignin content could be problematic, but the C/N ratio should be excellent -- at least with the addition o...
by Bob
Tue Sep 24, 2002 12:47 pm
Forum: Anaerobic Digester
Topic: saving the world and other fun stuff...
Replies: 30
Views: 69734

H2 from agwaste

Most interesting idea, Nathan. With your permission, I'm taking the liberty of cross-posting your email (with links attached), that fleshes out the idea. =========================================== Bob, Here is a simple hypertext outline of the idea I mentioned in the forum post. I had two goals in ...
by Bob
Wed Jul 10, 2002 6:14 am
Forum: Anaerobic Digester
Topic: Milk does a digester good?
Replies: 1
Views: 5089

Hmm... Milk, huh?

That's a surprise. I don't its composition, but I would guess that, by itself, the C/N ratio would be too low to produce very much methane. Hydrogen, maybe?
by Bob
Sun Jul 07, 2002 4:06 pm
Forum: Anaerobic Digester
Topic: Beginner Digester Experiment
Replies: 1
Views: 5015

Thanks Dug Out,

good site! There's a lot that can be learned from such a simple system.
by Bob
Thu Jun 20, 2002 5:01 am
Forum: Bioshelter
Topic: ESA:Melissa Project
Replies: 9
Views: 27222

Do you have any links to information on this technology?
by Bob
Thu Jun 20, 2002 4:56 am
Forum: Biofilter
Topic: Wetland filter
Replies: 2
Views: 13880

I don't have a description of the "indoor wetland" portion of the treatment system per se, but do have a more general description of the Bioshelter of which it is a part here.


[This message has been edited by Bob (edited 06-20-2002).]
by Bob
Fri Apr 12, 2002 3:46 pm
Forum: Composting Toilet
Topic: urine separation from main compost
Replies: 1
Views: 11307

There are a number of urine-separating toilets on the market, but I haven't personally used any of them to know how they compare.Here is a link to one. And a couple of pictures.

Image
Image
by Bob
Fri Apr 12, 2002 3:31 pm
Forum: Composting Toilet
Topic: cling-proofing the waste chute
Replies: 4
Views: 16346

That's an interesting idea. The advantage of the throway liner is relatively little fuss, but disadvantage is that when you do throw it away, it will be pretty nasty, including uncomposted fresh material. I had in mind a more rigid, permanent, cleanable, non-stick (relatively) liner. Maybe 1/8" thic...
by Bob
Tue Apr 09, 2002 3:27 pm
Forum: Anaerobic Digester
Topic: design of digestor for greenhouse
Replies: 1
Views: 5042

Right off the top, that sounds like a very practical idea. Of course the devil is in the details.

With regard to burning the gas in fuel cells, I don't know. Last I checked, the only commercially available unit for natural gas cost about $1M, and I don't know what scrubbing it would need.
by Bob
Sat Feb 02, 2002 12:47 pm
Forum: Bioshelter
Topic: Sun Tempered Superinsulated Bioshelter
Replies: 3
Views: 15082

While, in general, I applaud your ideas and enthusiasm, I'd add qualifiers to a number of them--if we are talking about real-world feasibility. For example: I'm not sure that zero infiltration is either an ideal or healthy goal, let alone achievable. Exchanging gases with Gaia is not a bad thing, an...
by Bob
Sat Feb 02, 2002 11:21 am
Forum: Bioshelter
Topic: Bio-regenerative life support module.
Replies: 5
Views: 18298

Hi David, re: "... the Mall would be an ideal place to practice bio-regenerative life support methods because when they are closed at night one could use the bathroom resources in the planters, all they need do is store them during the day or maybe send it through the methane digester, extract energ...
by Bob
Thu Jan 24, 2002 2:50 pm
Forum: Anaerobic Digester
Topic: Gas for Cooking from household waste..
Replies: 1
Views: 4904

Hi David,

Did you check out my new digester calculator? With it, you should be able to answer some of your questions. To use it, you need to have Java enabled in your browser. If you have trouble getting it to work, let me know.

[This message has been edited by Bob (edited 01-24-2002).]
by Bob
Thu Jan 24, 2002 2:42 pm
Forum: Bioshelter
Topic: Bio-regenerative life support module.
Replies: 5
Views: 18298

Hear, hear!
by Bob
Sat Jan 19, 2002 12:10 pm
Forum: Composting Toilet
Topic: Welcome!
Replies: 3
Views: 14137

Ask away!
by Bob
Fri Dec 21, 2001 7:30 am
Forum: Anaerobic Digester
Topic: anaerobic digesters for dummies
Replies: 2
Views: 6343

I finally got a revised on-line design tool working. I still want to do some refinements, and add to the help info, but try this.

[This message has been edited by Bob (edited 12-21-2001).]
by Bob
Sat Dec 08, 2001 11:32 am
Forum: Anaerobic Digester
Topic: Biogas Digester for Dog Kennel wastes on Cyprus?
Replies: 19
Views: 27568

After thinking about it a little further, probably regular composting -- i.e. without worms -- might be better. The advantage of worms is that they do the work of turning the pile, to homogenize and aerate it, but the disadvantage is that you can't let the compost get hot enough to kill the pathogen...