Citrus isn't so great for anaerobic digestion but it generated a bit of a discussion in one of my fb groups.
Thomas Gram sent this interesting article about an emerging solution for bio-remediation using an extract from citrus peel with sulfur to pull mercury and palladium out of polluted water and soil.
And then I saw this article on what happens to barren land when you dump tons and tons of citrus peel and wait long enough.
How 12,000 Tonnes of Dumped Orange Peel Grew Into a Landscape Nobody Expected to Find