Abstract:Based on the actual production and scientific research needs of semi-membrane-covered aerobic composting, a kind of energy-saving, environmentally friendly and intelligent semi-membrane covered aerobic composting system was designed, including a master control system, ventilation control system, sensor system and membrane sealing system. Based on the system functional requirements above, the work of designing holistic system, selection of function modules and independent design of each modules was done, specifically including: component selection and structure design of the master control system and ventilation control system, selection of sensors and establishment of monitoring methods, determination of communication methods, design of expansion module, selection of semi-membrane and an establishment of seal fixation solutions for membranes and compost pile and ventilation control program programming of membrane-covered compost system. Based on the above system modules, the device system can realize high-precision real-time monitoring and display of key parameters for composting, flexible and intelligent feedback control of ventilation and oxygen supply, and multi-device wireless communication and other functions. The China’s conventional trough composting model was selected as the composting infrastructure. The performance of aerobic composting with membrane covering was studied by using cow manure from surrounding dairy farms and corn stalks in the planting area as the main compost material. The results showed that during the entire composting process, the maximum temperature of the body exceeded 70℃ and the duration of high temperature met the requirements for the harmless treatment of manure. The oxygen concentration was maintained at a suitable level (higher than 5%), and the whole aerobic fermentation of the whole body under the film coating process was in good condition. From the actual conditions of the flow rate, frequency, temperature, pressure and oxygen concentration parameters monitored by the system and the realization effect of each functional module, each module of the system operated basically well and can basically realize the data of temperature, pressure, flow rate and frequency. The real-time acquisition, display and export functions enabled the local area network wireless communication functions of the total control system, the wind control system, and the PC, and can realize the function of intelligent feedback mode to adjust the ventilation mode. In general, the research and design of this equipment had a positive effect on the intelligence and greenness of China’s aerobic composting equipment, but the system still needed to be further upgraded to meet the actual production needs of membrane-covered aerobic compost.
