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Feeding the worms

Adding food scraps to the worm binEven though the worm bin needs a bit more work before it's completely critter-proof, I couldn't resist putting in the first round of food scraps Saturday.  Partly, the impetus was impatience on my part, but I was also thinking about worm biology.  Although we think that worms eat our garbage (and there is, in fact, a book with that name), worms really eat the microorganisms that eat our garbage.  Our worms can't do much with food scraps until the waste material has been composting for about a week, so I figured I'd better get that process started.

Covering the food scraps with beddingWe pick up food scraps twice a week, but right now I'm keeping the worms on a once a week feeding schedule.  For our estimated 9 pounds of worms, I figure they can handle 30 to 60 pounds of food scraps per week (plus however much bedding I mix in to keep the bin in good shape.)  Since the weather is still on the cool side and the worms are just getting used to their new home, I added 37 pounds for their first week's diet.  In a couple of weeks, I should be able to poke through this week's compost zone and see whether the worms have done their job, which will give me an idea about whether I should slow down or speed up Worm bintheir food intake.  I have high hopes that within a couple of months, the worm population will have expanded far enough that we can put all of the school's food scraps in without worrying about overloading the bin.

As a side note, you might notice the hamburgers poking out of the top of the mass of food scraps in the first photo.  Most websites will tell you to steer clear of breads, meats, and oils in your worm bin, mostly because they attract scavenging animals and can smell.  However, I suspect that the large size of our worm bin (and its distance from habitation) will mitigate these issues and allow us to mix in all types of waste.  I'll let you know if we have any problems.

Our chicken waterer keeps your backyard flock hydrated even if you have to leave town for the weekend.



This post is part of our Hands-on Wormkeeping lunchtime series.  Read all of the entries:





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Can you use wood chips for carbon?
Comment by Errol Wed Feb 23 15:35:10 2011
I could in a pinch, but wood chips are such a bit hunk of carbon that they'd take a lot longer to break down than anything else in the bin. I'd have to set the worm castings aside for a few months after the worms were done with them for the chips to finish up, or screen them out. Right now, I'm just using the wood chips for the carbon in our spillover compost pile, and am scrounging for smaller particles of carbon.
Comment by anna Wed Feb 23 16:07:36 2011

Some things are avoided from being added to bins due to the contents of the materials or the effect they have. Breads can sometimes cause heat spikes, citrus peels contain limonene (limonene is a natural insecticide, used as a solvent, and is a skin irritant).. so once it is oxidized it's potency is reduced and then they are able to process it.

Bedding... bedding is yet another food source. The materials used generally break down more slowly but they as well decompose and provide food sources for the worms.

Caution is used when offering food because aside from attracting things you don't want (ants, scavengers, etc.).. you run the risk of the contents hot composting. Improper hot composting puts out higher levels of carbon dioxide, ammonia, nitrous oxide.. or if too wet methane.

I'm not trying to be discouraging.. just one of the biggest pitfalls in vermicomposting is overfeeding (and not enough airflow... or too wet).

If you are looking to breakdown meats, grease, oils, dairy, etc. the black soldier fly maggot would make quick work of it. The worms do feed off of the microbes decomposing the materials.. but different microbes have different diets.

If you are trying to process too much materials.. maybe consider hot composting.. and like in nature let the worms finish off the compost.

Best of luck to you.

Comment by Anne Wed Feb 23 17:54:56 2011

Thanks for your feedback. We're working with scraps from a school, so we can't sort anything out without a lot of trouble. The author of Worm Cafe, which we based our system on, noted that nothing really causes too much trouble in large-scale worm bins like ours.

As long as you don't overfeed, of course! We're being very careful to weight the food and match it up to the weight of worms we have available. If anything, I'm going a little overboard on the bedding to make up for mixing so many odd things in there together, and that should keep the bin from having any real trouble. No signs of smell so far, which I take to be a good sign.

Since we weren't able to buy enough worms to use all of the food scraps right away, we're composting the rest in a traditional compost bin. And we do have black soldier flies on the horizon, although you really can't start those at this time of year since the adults don't start flying until April or May.

Comment by anna Wed Feb 23 18:48:51 2011

I've seen a few sewage treatment facilities using poplar wood chips (from their own grove of trees) for treating waste sludge via composting. It's a hot process and they use the chips because they do not break down very fast so may be reused at least three times and as many as five times before they are no longer adequate to the job. They are used to keep the piles aerated and eventually absorb and break down from the nutrients. They let the piles run hot to the point of being uncomfortable to stand near or breath the gases generated. Once out of range you can't tell it's there except for some vapor that escapes the building in winter. The farmers and gardeners in the area love the stuff and make the sewer plants some needed extra revenue even though the compost is fairly cheap--just not free. If you decided to use chips you could reuse them perhaps several times depending on how long you keep them in individual heaps. Just a thought for the future.

Comment by vester Wed Feb 23 19:09:49 2011
If screening the chips doesn't turn out to be more trouble than it's worth, I might try reusing them in the excess food scraps I'm composting without worms. Fascinating information that you shared about that possibility! Another alternative use for the slow-to-decompose wood chips mixed into faster decomposing waste might be mulch --- now that I'm getting my compost fix with worm castings and awesome manure, I'm starting to feel a bit of an empty spot for more mulch.... :-)
Comment by anna Wed Feb 23 19:46:16 2011
Sawdust?
Comment by Errol Thu Feb 24 07:02:08 2011
I think I read somewhere that sawdust is a bit more prone to mat down than other bedding (although I'll bet it would be less problematic than hand-torn cardboard.) We've been keeping our eyes open for a source of sawdust just for general use, but no sign of free piles of it yet! Once we finish hauling all of our manure, we'll probably start paying more attention to that search.
Comment by anna Thu Feb 24 09:41:36 2011
I can get it free at local sawmills and wood finishing operations. Free if I load it myself. $10 if they load it with their skidsteer.
Comment by Errol Thu Feb 24 10:52:03 2011
That's on our agenda, but we haven't taken the time yet to try to hunt them down.
Comment by anna Thu Feb 24 12:01:27 2011

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