LUXiao-fei,XUYu-lin,MAFang,et al.Effect of Temperature on CSTR-EGSB Two-stage Anaerobic Reactor[J].China Water & Wastewater,2023,39(1):65-72.
Effect of Temperature on CSTR-EGSB Two-stage Anaerobic Reactor
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第39卷
Number:
第1期
Page:
65-72
Column:
Date of publication:
2023-01-01
- Abstract:
- Biogas production efficiency and operational stability of biogas project (especially in the low temperature areas in the north) are very sensitive to the temperature conditions. This paper used a two-stage anaerobic reactor consisting of a continuous stirred tank and an expanded granular sludge bed (CSTR-EGSB) to evaluate the acidogenesis and methanogenesis efficiency at different temperatures with cow manure and rice straw as substrates. The SCOD, pH, total ammonia nitrogen (TAN) in the CSTR (acidogenic reactor) varied greatly when the temperature was in the range of 25-35 ℃. When the temperature decreased from 35 ℃ to 25 ℃, the proportion of acetic acid in total volatile fatty acids (VFAs) decreased from 62.9%-70.5% to 46.3%-59.4%. When the temperature of EGSB (methanogenic reactor) was decreased to 15 ℃, the biogas volumetric yield, proportion of methane and TCOD removal rate were still 127.33 mL/(L·d), 33.3% and 32.3%. The high?throughput sequencing results showed that Methanomicrobiaceae might play an important role in the methanogenesis process at low temperature. The limited acetic acid generation and intensified propionic acid accumulation at low temperature might be one of the reasons for the low methanogenesis efficiency of the biogas project. Therefore, psychrophilic methanogenic agents based on families of Methanomicrobiaceae and Euryarchaeota_unclassified can be further developed.
Last Update:
2023-01-01