the little old lady wrote:
o.k. What is a black soldier fly composter? Do I want one? Does it compost the flies?
It's a farming operation that feeds waste organic matter to a special sort of maggot.
Black soldier fly larvae become exceedingly fat, because the adults don't eat. Their fatness can be useful, and the adults not eating makes them more sanitary. As mentioned above, the larvae are also quite tough, able to take a beating and to handle their liquor. As they get fat enough, they crawl away from the food looking for soil to burrow into, and so they harvest themselves.
You might want one if you have a use for large numbers of highly caloric insects: keeping chickens, raising fish, selling bait, etc.
You would also want one if you have access to sudden surges of greasy or high-protein food waste, and want it turned into something useful quickly, without the need for a huge amount of space, compost browns, or labor.
Similarly, you might want one to deal with food scraps in winter, with the feeding of livestock as a side benefit.
I've heard of schemes to make biodiesel out of the larvae.
The waste excreted by the flies isn't as good to grow in as worm castings, but it's a good first step.
"the qualities of these bacteria, like the heat of the sun, electricity, or the qualities of metals, are part of the storehouse of knowledge of all men. They are manifestations of the laws of nature, free to all men and reserved exclusively to none." SCOTUS, Funk Bros. Seed Co. v. Kale Inoculant Co.