曝气距离对植物源废弃物气流膜好氧发酵效率的影响

利用工厂化气流膜堆肥方式,探究了距离风机不同位置对堆体中废弃尾菜配伍蘑菇渣和醋糟发酵效率的影响.试验将尾菜、醋糟和蘑菇渣按照鲜重比1:1:3混合均匀后,放入气流膜发酵槽中,覆盖戈尔膜,底部曝气发酵30 d,以靠近风机一侧的终点为0点,分别于距离风机1.5、4.5、9.0、13.5、16.5 m处取样,测定了堆肥过程中距...

Effect of Aeration Distance on Aerobic Fermentation Efficiency of Plant Wastes in Air Flow Membrane Fermentation Process

In this study, the effects of different locations away from the fan on the fermentation efficiency of the vegetable wastes mixed with mushroom residue, vinegar bad in aerobic-membrane composting reactor were investigated. Vegetable wastes, vinegar grains and mushroom residue were mixed in a fresh weight ratio of 1:1:3, transferred into aerobic-membrane composting reactor, covered gas flow membrane, and aerated via the bottom of pile body for 30 days. Samples were taken from 1.5, 4.5, 9, 13.5 and 16.5 m positions away from the fan to evaluate the variations of physicochemical properties such as temperature, water content, pH value, C/N ratio, germination index and nutrient contents in these samples during the composting process. Results showed that during composting, differences of the fermentation efficiency at different locations away from the fan were observed to some extent. Total nutrient contents of decaying materials at 1.5, 4.5 and 9 m away from the fan were higher than 5% with the values of 5.31%, 5.2% and 5.27%, respectively; however, the total nutrient contents of in materials at 13.5 m and 16.5 m away from the fan were only 4.94% and 4.83%, respectively. At the end of composting, the germination index of decaying materials at each site reached 102.8%, 89.3%, 98.0%, 82.4% and 85.5%, respectively, which were all above 80%. The results of field experiment showed that compared with application of raw materials, amended with decaying materials increased cowpea yields, especially for treatments added decaying materials collected from 1.5 m, 4.5 m and 9 m sites away from fan, the yields of which increased by 1.8%, 4.52% and 6.78%, respectively, compared with chemical fertilizer treatment. To sum up, this study observed that in the air flow membrane composting process, materials at different locations away from the fan can be fermented, and the decaying materials closer to the fan have higher nutrient contents and better plant growth promotion effect in the field.