有机负荷和进料频率对高含固厨余垃圾厌氧消化系统性能的影响

In order to maximize the processing capacity of the system, we explored the influence of different organic load rate (8.93, 10.71, 13.39 kg•m^-3•d^-1) and feeding frequencies (1, 2, 3 time(s)•d^-1) on the anaerobic food waste digestion system. The changes in methane production, SCOD, ammonia nitrogen, pH, and volatile fatty acids (VFAs) during the operation of the mesophilic anaerobic digestion system were examined. The results showed that the organic loading rate (OLR) of the system had an optimal value. The cumulative methane production of the system increased with the increase of OLR, and then decreased. The maximum OLR of anaerobic digestion system was 10.71 kg•m^-3•d^-1 and the anaerobic system exceeding this load failed. The total methane production under this load was 37.17 L and the VS degradation rate reached 72.58%. We observed a higher stability and stronger substrate processing capacity under this load. Increasing of feeding frequency can optimize the operating parameters of the system, and significantly increase gas and methane production of the system. The best performance occurred under the frequency of 3 time(s)•d^-1. Under this condition, the accumulative methane production during digestion was 45.03 L of which the highest methane production rate was 0.738 L•g^-1 and the average value was 0.480 L•g^-1 during the digestive process which was 20.30% higher than 1 time•d^-1. Addition of feeding frequency promote biogas production, enhance system stability, improve system's tolerance to ammonia nitrogen, alleviate the problem of system acid accumulation. Our study thus not only provide the best feeding load but also give a feasible suggest to enhance the process stability.