Talk:Azolla and Duckweed Calculations

The downside with a very "tight" nutrient cycle involving humans is the risk of retaining in the system: pharmaceuticals, hormones, microbes/other pathogens. The larger the number of people using this toilet, the higher the likelihood that somebody will be on some antidepressant or birth control pill. Possible solution: dry all waste and burn it. Collect urine with sawdust, dry it, burn it. Collect humanure, dry it, burn it. Use the resulting ashes to fertilize the duckeweed/azolla pond. Some nitrogen would be lost but that's OK, it's minimal. Urine sawdust could be continuously aerated to keep it dry. My suggestion: use human urine and humanure in other ways (e.g. fertilize trees, biomass plants). --Rasmus (talk) 22:32, 13 April 2016 (CEST)