The Changing Principles Study of Multiple Parameters in the High Temperature Composting Process with Agricultural Livestock Manure

Abstract

The reasonable utilization of livestock manure could decrease the utilization of primary energy, possessing huge potential and meaning for sustainable development of economy. In this work, agricultural composting was runned with the material of fresh cow manure, pig manure and chicken manure as well as the bulking agent of 10% corn straw. The changing trends of parameters such as temperature, pH, the conductivity and the density were mainly studied. It showed that the composting temperature in three composting stages demonstrated a trend of initial increasing and then decreasing. The composting temperature in boxes of R1, R2 and R3 all exceeded 45 °C on the 3rd d of the composting reaction. On the 6th d of the composting reaction, the temperature of the boxes of R1, R2 and R3 reached the maximum of 65.7, 66.3 and 66.8 °C, respectively, which have satisfied the requirement of the hygienic standard of the fecal decontamination (GB7959-87). The initial water contents of the composting material of there were 65.28, 66.34 and 64.58%, respectively. The conductivity during experiments demonstrated a change of initial decreasing, then increasing and final decreasing. The conductivities were stable with values of 1.7, 1.9 and 2.0 S/cm, respectively when the compost is finished. e livestock manure.