Biosolids - The Word
NEBRA Information Update on the creation & official use in numerous jurisdictions of the term "biosolids" (2008)

Residuals (organic residuals, organic wastes): wastes from human activities that contain carbon and are putrescible (will decompose fairly quickly), including pulp and paper mill residuals, food processing residuals, industrial process residuals (e.g. gelatin from film production), animal manures, and food scraps.  Biosolids and septage are other kinds of organic residuals.