Evolution of anaerobic granular sludge (AGS) under high H2 partial pressure
XU Heng1,2, XIA Yu1, WANG Jian-Bing1, HE Xu-Wen1, WANG Kai-Jun2
1. School of Chemical and Environmental Engineering, China University of Mining & Technology(Beijing), Beijing 100083, China; 2. State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China
Abstract：To investigate the feasibility of in-situ/biological biogas upgrading (IBBU) in anaerobic wastewater treatment (AnWT) using anaerobic granular sludge (AGS), the evolution of AGS under high H2 partial pressure and shear force was monitored with increasing influent COD load in the anaerobic sequencing batch reactor (ASBR), in terms of reactor performance and characteristics of AGS. The results showed that smaller but intact AGS was formed and exhibited high-rate performance when the influent COD load was below 5g/(L·d). Propionate degradation via H2 interspecies transfer (HIT) mechanism was possibly enhanced in AGS. However, when the influent COD load was further increased over 6g/(L·d), uncontrollable propionate accumulation was observed. Therefore, it's necessary to find other techniques to reduce propionate accumulation under higher influent COD load in the future.
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