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Int. J. Environ. Res. Public Health 2017, 14(12), 1483; doi:10.3390/ijerph14121483

Microbial Insight into a Pilot-Scale Enhanced Two-Stage High-Solid Anaerobic Digestion System Treating Waste Activated Sludge

1
State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China
2
China Northwest Architecture Design and Research Institute Co. Ltd., Xi’an 710018, China
*
Author to whom correspondence should be addressed.
Received: 9 November 2017 / Revised: 24 November 2017 / Accepted: 27 November 2017 / Published: 30 November 2017
(This article belongs to the Section Environmental Engineering and Public Health)
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Abstract

High solid anaerobic digestion (HSAD) is a rapidly developed anaerobic digestion technique for treating municipal sludge, and has been widely used in Europe and Asia. Recently, the enhanced HSAD process with thermal treatment showed its advantages in both methane production and VS reduction. However, the understanding of the microbial community is still poor. This study investigated microbial communities in a pilot enhanced two-stage HSAD system that degraded waste activated sludge at 9% solid content. The system employed process “thermal pre-treatment (TPT) at 70 °C, thermophilic anaerobic digestion (TAD), and mesophilic anaerobic digestion (MAD)”. Hydrogenotrophic methanogens Methanothermobacter spp. dominated the system with relative abundance up to about 100% in both TAD and MAD. Syntrophic acetate oxidation (SAO) bacteria were discovered in TAD, and they converted acetate into H2 and CO2 to support hydrogenotrophic methanogenesis. The microbial composition and conversion route of this system are derived from the high solid content and protein content in raw sludge, as well as the operational conditions. This study could facilitate the understanding of the enhanced HSAD process, and is of academic and industrial importance. View Full-Text
Keywords: enhanced two-stage high-solid anaerobic digestion; hydrogenotrophic methanogenesis; syntrophic acetate oxidation; waste activated sludge enhanced two-stage high-solid anaerobic digestion; hydrogenotrophic methanogenesis; syntrophic acetate oxidation; waste activated sludge
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Wu, J.; Cao, Z.; Hu, Y.; Wang, X.; Wang, G.; Zuo, J.; Wang, K.; Qian, Y. Microbial Insight into a Pilot-Scale Enhanced Two-Stage High-Solid Anaerobic Digestion System Treating Waste Activated Sludge. Int. J. Environ. Res. Public Health 2017, 14, 1483.

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