I have built up a collection of the best projects and ideas in a number of areas - eventually I’ll gather them on a website - I’m getting there with that …… but in the meantime ……..
Local mushroom production is getting well established - the first two are local green businesses using coffee grounds (these are in southwest England)
Nice video of an urban mushroom farm - seems to use only coffee grounds (bike with trailer collection and delivery service !!) http://grocycle.com/urban-mushroom-farm/
This video is the most important one to look at and show people, I think it lasts about 3 minutes. There is also a site with more words and a better description of the process from a similar project is http://www.fungi-futures.co.uk/how-do-we-turn-waste-coffee-into-gourmet-mushrooms/ and there is also a home-scale version of this https://www.growveg.co.uk/guides/growing-gourmet-mushrooms-at-home-from-waste-coffee-grounds/
I think it’s one of those things where medium scale may go better than small scale
Plastics Recycling also has huge potential - as a free raw material, as job creation, education, and local economy elements.
My estimate is that 1 million plastic bottles go into the waste every week in Merseyside
Precious Plastics is mostly focussed on building cheap and simple machinery to do plastic recycling - http://preciousplastic.com/ The video on the front page is the key one to look at, but they have a lot more good information and designs for machines there on the site. I think there is a lot of potential in this type of thing.
https://www.indiegogo.com/projects/transforming-plastic-to-save-our-planet#/ is a good video of making building bricks from waste plastic in a very simple way - you don’t have to sort and clean it so much as making smaller things. But, how would they fit with the building and fire regulations ? - their funding request is to get the proper testing done for that