Sewage in Washington, DC gets treated to such a degree that the remaining “biosolids” are sold as a soil conditioner/fertilizer: https://bloomsoil.com/about-bl

Sewage in Washington, DC gets treated to such a degree that the remaining “biosolids” are sold as a soil conditioner/fertilizer: https://bloomsoil.com/about-bloom-soil-amendment/ https://bloomsoil.com/about-bloom-soil-amendment/ They also generate 8MW of electricity from burning the methane produced during treatment, which is about a third of their electricity requirement.