Meng Liqiang, Li Weiguang, Zhang Xiancheng, Zhao Yi, Chen Li, Zhang Shumei
Institute of Microbiology, Heilongjiang Academy of Sciences, 150010, Harbin, China.
Institute of Advanced Technology, Heilongjiang Academy of Sciences, 150020, Harbin, China.
Heliyon. 2020 Sep 22;6(9):e04988. doi: 10.1016/j.heliyon.2020.e04988. eCollection 2020 Sep.
The present study included lab-scale sewage sludge (SS) composting amended by molasses and spent mushroom substrate (SMS) in 5 L composting reactor system. The influence of molasses and SMS amendment on nitrogen loss and humification of SS composting was evaluated. The results showed that SMS amendment, especially combination with molasses raised composting temperature, increased CO volatilization, promoted organic matter degradation, improve germination index and humification process. The addition of SMS and molasses contain carbohydrates used as carbon source and energy substance by microorganisms could increase microbial activity and ammonia assimilation. In the SMS + molasses treatments, NH volatilization was reduced by 33.1%-37.3% and NO volatilization was only 17.8%-25.4% of that in the control treatment, furthermore, the nitrogen loss rate was reduced by 27.2%-32.2%. Consequently, the addition of SMS and molasses improved the compost maturity and reduced nitrogen loss in the SS composting process.
本研究在5升堆肥反应系统中进行了实验室规模的污水污泥（SS）堆肥，该堆肥用糖蜜和蘑菇渣（SMS）进行了改良。评估了糖蜜和SMS改良对SS堆肥氮素损失和腐殖化的影响。结果表明，SMS改良，特别是与糖蜜结合，提高了堆肥温度，增加了CO挥发，促进了有机物降解，提高了发芽指数和腐殖化过程。添加的SMS和糖蜜含有碳水化合物，可作为微生物的碳源和能量物质，能增加微生物活性和氨同化作用。在SMS + 糖蜜处理中，NH挥发减少了33.1%-37.3%，NO挥发仅为对照处理的17.8%-25.4%，此外，氮损失率降低了27.2%-32.2%。因此，添加SMS和糖蜜提高了堆肥成熟度，减少了SS堆肥过程中的氮损失。
