—With surplus sludge after being treated for 30 minutes at 5MPa, 150℃ as matrix, the operating efficiency of mesophilic two-phase anaerobic digestion system was examined. The result showed that the removal rate of sludge VS decreased as organic load increased and the removal rate of the system VS was 59.4%, 54.7%, 50.21%, and 42.2% respectively when the organic load was 0.98, 1.57, 2.35 and 3.13kgVS/m3•d. If acidogenic phase controlled in ethanol-type fermentation period, the specific hydrogen production of acidogenic phase in this condition achieved 0.018 L•H2/g•VS. When the two phase anaerobic digestion system organic load at 3.13 kgVS/(m3•d), the removal rate of acidification phase and the two phase system VS removal is 15.7% and 42.2% respectively. In anaerobic digestion acidification stage portion EPS from activated sludge floc in vivo release, such as the release of methane-producing bacteria Extracelluler Polymer Substances （EPS） could not be timely use will result in the increase of sludge EPS impact sludge settling and dewatering performance.
—Surplus sludge, mesophilic two-phase anaerobic digestion, ethanol-type fermentation.
Guang Li and Xiangkui Han are with the Key Laboratory of Songliao Aquatic Environment, Ministry of Education, Ji Lin Jian Zhu University, Changchun, China (e-mail: email@example.com; firstname.lastname@example.org). Jing Li is with Jilin Jian Yuan Design Group fifth Institute, Changchun, China (e-mail: email@example.com).
Cite:Guang Li, Jing Li, and Xiangkui Han, "Efficiencies of Mesophilic Two-Phase Anaerobic Digestion of Pretreated Surplus Sludge," International Journal of Environmental Science and Development vol. 4, no. 5, pp. 576-581, 2013.