Abstract:

Four pilot swine manure composting experiments were conducted to investigate the temporal-spatial dis-tribution of pile temperature of aerated static bin composting system during the composting of swine manure.The re-suits are as follows:(1)the pile temperature undergoes three phases(heating,thermophilic and cooling phases),and the duration of the thermophilic phase is long enough to conform to the sanitary standard of the non-hazardous treatment of nightsoil;(2)the pile structure can be improved by adding rice straw in sawdust,and the increasing rate of temperature is more significantly enhanced than that with sawdust,thus benefiting the temperature increasing process and the composting process;(3)when corn corb is used,the thermophilic phase with the temperature be-ing controlled at 70℃ is prolonged compared with that at 60 ℃ which would postpone the maturity of composts;(4)the distribution of pile temperature presents gradient effect,that is,the temperature in the under layer is higher than that in the upper layer in the initial phase,while it is opposite after entering the therm ophilic phase.

Key words: animal waste, aerobic composting, composting temperature, temporal-spatial distribution, gradient effec