School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.
Bioresour Technol. 2012 Jan;104:266-73. doi: 10.1016/j.biortech.2011.11.041. Epub 2011 Nov 20.
Batch experiment was carried out in a simulated thermophilic aerobic digester to investigate the digestion process of one-stage autothermal thermophilic aerobic digester and to explore the sludge stabilization mechanism. Volatile solids removal was 38.4% at 408 h and 45.0% at 552 h. Chemical oxidation demand, total nitrogen, and ammonia nitrogen in supernatant increased rapidly up to 168 h, and all of them fluctuated moderately after 360 h. Volatile fatty acid (VFA) accumulated rapidly up to 24 to 168 h, then declined sharply, reaching a low concentration after 312 h. Propionic, iso-valeric, and iso-butyric acids, in addition to acetic acids, were also the major components of VFA. As the biochemical metabolic process was inhibited under oxygen-deficiency condition, the digestion system can produce acetic, propionic, butyric acids and other VFA constituents to meet the demand for NAD(+) and maximize ATP generation. The ORP affected the VFA production and depletion as well as sulfate levels.
在模拟高温好氧消化器中进行了批量实验，以研究单级自热高温好氧消化器的消化过程，并探索污泥稳定化机制。在 408 小时和 552 小时时，挥发性固体去除率分别为 38.4%和 45.0%。上清液中的化学需氧量、总氮和氨氮在 168 小时内迅速增加，在 360 小时后均呈适度波动。挥发性脂肪酸（VFA）在 24 到 168 小时内迅速积累，然后急剧下降，在 312 小时后达到低浓度。丙酸、异戊酸和异丁酸除了乙酸外，也是 VFA 的主要成分。由于在缺氧条件下生化代谢过程受到抑制，消化系统可以产生乙酸、丙酸、丁酸等 VFA 成分，以满足 NAD(+)的需求并最大限度地生成 ATP。氧化还原电位（ORP）影响 VFA 的产生和消耗以及硫酸盐水平。
