Study on dynamics model of Biodegration of organic matter in aerobic mesophilic composting reactor for sanitary disposal of human feces

摘要

Aerobic composting is a method for sanitary disposal of human feces as has been used in bio-toilet systems. As the composting method can be used at family in city to save water and to control water pollution, it would be favorable if the composting process could be controlled for easily orperating and saving energy as far as possible. In this study, batch experiments were conducted using a closed aerobic composting reactor with sawdust as the bulky matrix to simulate the condition of a bio-toilet for sanitary disposal of human feces. Attention was paid to the Biodegration property of organic matter. Under a controlled condition of temperature at 35°C(near composting condition at home without heating), moisture content at 60%, and continuous air supply, more than 63% fecal organic removal was obtained in a two-week composting period. Based on assumptions that the organic matter of feces was invided into two parts included degradation and undegradation, the organic matter’s biochemical degradation of similar level 1 dynamics model can build. Using the experimental data of composting reaction under mesophilic composting conditions, calculated out respectively reaction kinetics constants 0.2684. Without an automatically controlled heating system, mesophilic composting could be considered to also keep more than 63% fecal organic removal, while proloogting maturity period of compost.