Biodegradability of fecal nitrogen in composting process

Biodegradability of fecal nitrogen was studied in composting process. Fecal nitrogen was subdivided into two fractions: a type originally inert in biological activity (NXI), and a slowly biodegradable one (NXS). During the composting process, an inert type of organic matter (NXIB) was reproduced by endogenous respiration of heterotrophic microorganism. Evaluations for fecal nitrogen formed a conclusion of 75% (NXS) and 25% (NXI), respectively. It was estimated that the NXIB could be 9% of initial fecal nitrogen. Thus, approximately 34% (NXI + NXIB) of initial fecal nitrogen remained in the composting material (mixture of sawdust and feces) as biologically inert type of organic nitrogen.