Zhang Bo, He Pinjing, Lü Fan, Shao Liming
State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China.
J Environ Sci (China). 2008;20(3):297-303. doi: 10.1016/s1001-0742(08)60047-9.
The vegetable wastes and flower stems were co-digested to evaluate the anaerobic hydrolysis performance of difficultly biodegradable organic wastes by introducing readily biodegradable organic wastes. The experiments were carried out in batches. When the vegetable wastes were mixed with the flower stems at the dry weight ratio of 1 to 13, the overall hydrolysis rate increased by 8%, 12%, and 2% according to the carbon, nitrogen, and total solid (TS) conversion rate, respectively. While the dry weight ratio was designed as 1 to 3, there was a respective rise of 5%, 15%, and 4% in the conversion rate of carbon, nitrogen, and TS. The enhancement of anaerobic hydrolysis from the mixed vegetable wastes and flower stems can be attributed to the formation of volatile fatty acids (VFA) and nutrient supplement like nitrogen content. The maximum VFA concentration can achieve 1.7 g/L owing to the rapid acidification of vegetable wastes, loosing the structure of lignocellulose materials. The statistic bivariate analysis revealed that the hydrolysis performance was significantly related to the physical and biochemical compositions of the feeding substrate. Especially, the soluble carbon concentration in the liquid was significantly positively correlated to the concentration of nitrogen and hemicellulose, and negatively correlated to the concentration of carbon and lignocellulose in the feeding substrate, suggesting that the regulation and control of feedstock can have an important influence on the anaerobic hydrolysis of organic wastes.
将蔬菜废弃物和花茎进行共消化，通过引入易生物降解的有机废弃物来评估难生物降解有机废弃物的厌氧水解性能。实验采用分批进行。当蔬菜废弃物与花茎以干重比1:13混合时，根据碳、氮和总固体（TS）转化率，总体水解率分别提高了8%、12%和2%。而当干重比设计为1:3时，碳、氮和TS的转化率分别提高了5%、15%和4%。蔬菜废弃物和花茎混合后厌氧水解的增强可归因于挥发性脂肪酸（VFA）的形成以及氮含量等营养补充。由于蔬菜废弃物的快速酸化，木质纤维素材料结构松散，VFA的最大浓度可达到1.7 g/L。统计双变量分析表明，水解性能与进料底物的物理和生化组成显著相关。特别是，液体中的可溶性碳浓度与进料底物中的氮和半纤维素浓度显著正相关，与碳和木质纤维素浓度显著负相关，这表明原料的调控对有机废弃物的厌氧水解有重要影响。
