Biomass Water Purification

This is a grow-harvest unit, it's the basis of any autonomous residence for modern living. The reason is to use biomass to extract the excess nutrients in wastewater takes time, in a city you can't put in ponds and they cost too much anyway so the game is a high growing volume with a small footprint.

This cube satisfies that, 16" on a side it has 24-times the lighted surface to footprint, can stack to 7-high, 4 cubes handle a person per day, 6 cubes per pig, 10 cubes per dairy cow for farms producing conservatively 2-gallons of biodiesel a day for a person, 3-gal/pig, 5-gal/cow.

The water at the end is almost pure so treated and recycled, the pressed cakes good soil enhancements, adding organics with some minerals to preserve moisture.