I have some friends/colleagues/interlocutors based in East Africa who are working on a number of sustainable design technologies, and I’m going to use this thread to showcase and document some of them.
Right now they are working on a “maggot nursery” that will hatch black soldier flies which can consume food waste.
The nursery looks like this:
Interestingly, those dividers are made out of an environmentally friendly material called aircrete (foamed concrete without aggregate)
Here’s a video of some grubs they harvested
The numbers are kind of astronomical. Right now they are trying to hatch 20kg of grubs, each kg is about 7500 grubs. 150,000 flies. They eat 10x their weight depending on the food. Food should be ‘semi-stinky,’ fermented but not rotten.
Another related project: azolla. Grass with high protetin amino acid and vitamin content can be used for animal feed, and grown in small spaces with the right hydroponic setup. Theirs includes an aircrete filter that uses activated charcoal from rice husks.
One application they are imagining is for refugee camps, as my friend explains
You know all refugee camps can’t let animals out to graze. Has to do with customs and vet clearences. So in camps animals eat whatever trash is availible. With these solutions u feed the crap to the bugs ferns and weeds then the animals khave high protien and nutrient rich feed which intern makes healthier people. Idea I’ve had for years. I worked in many camps over the years in different capacities and always made me sad that the people eating shit because theres no ability to grow food or feed animals. I can fix that or at least provide direction and a foundation for others smarter then me to perfect a solution (9/10/21)