Effects of Indigenous and Exogenous Microbial Inocula on Dynamic Changes of Enzyme Activities during Composting in a Bioreactor

Abstract

The composting with chicken manure as raw material was carried out to study the effects of indigenous and exogenous inoculation on temperature, oxygen concentration, as well as protease activity, urease activity, dehydrogenase activity and cellulase activity in different composting stages by using a composting bioreactor. The treatment with indigenous microbial inocula had higher temperature and lower oxygen concentration at the beginning stage of composting. During the period of raising temperature, the protease activity, urease activity and temperature were highly significant positive correlation (p <0.01); At the period of raising temperature and High-Temperature, dehydrogenase activity and temperature were all highly significant positive correlation between (p <0.01); There was a significant positive correlation between the temperature and cellulase activity at the High-Temperature period (p <0.05) . Endogenous microbial inocula was favor of protein and urease activity increased rapidly, and the promoted the quick start of composting during the temperature raising; At the High-Temperature stage, cellulase and dehydrogenase activity were advanced after inoculated indigenous microbial inocula, promoted oxidation-reduction reaction during the composting.