State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, China.
Bioresour Technol. 2013 Nov;148:461-6. doi: 10.1016/j.biortech.2013.08.118. Epub 2013 Aug 27.
This study investigated the effect of pH (uncontrolled, 8.0, 10.0 and 12.0) and temperature (mesophilic, thermophilic and extreme thermophilic) on hydrolysis and acidification of dewatered sludge in 7-day batch fermentation experiment. Solublization of COD, protein and carbohydrates as well as concentration and composition of VFAs were investigated. Sludge hydrolysis was enhanced with higher pH and temperature. The maximum SCOD, soluble protein and carbohydrates was observed at pH 12.0 at extreme thermophilic condition. The maximum VFAs yield was obtained at thermophilic and was 2.15 times that at mesophilic condition, but it took more time to reach the maximum. The VFAs consisted of acetic, propionic, iso-butyric, n-butyric, iso-valeric, and n-valeric acids, and acetic acid was the prevalent product in most cases except for uncontrolled pH and pH 8.0 at mesophilic condition. The methane production was as follows: pH 8.0>pH 10.0>uncontrolled (0.015)>pH 12.0; mesophilic>thermophilic>extreme thermophilic.
本研究在 7 天批式发酵实验中考察了 pH 值（未控制、8.0、10.0 和 12.0）和温度（中温、高温和极端高温）对脱水污泥水解和酸化的影响。研究了 COD、蛋白质和碳水化合物的溶出以及 VFAs 的浓度和组成。随着 pH 值和温度的升高，污泥水解得到增强。在极端高温条件下 pH 值为 12.0 时，最大 SCOD、可溶性蛋白质和碳水化合物。在高温条件下，VFAs 的最大产率最高，是中温条件下的 2.15 倍，但达到最大值所需的时间更长。VFAs 由乙酸、丙酸、异丁酸、正丁酸、异戊酸和正戊酸组成，除未控制 pH 值和中温条件下 pH 值为 8.0 外，在大多数情况下，乙酸是主要产物。甲烷的产生情况如下：pH 值 8.0>pH 值 10.0>未控制（0.015)>pH 值 12.0；中温>高温>极端高温。
