Influence of Organic Loading Rate on the Performance of a Two-Phase Pressurized Biofilm (TPPB ) System Treating Food Waste
Yeqing Li1, Fang Yan1, Hong Liu1, 2, Yafei Wang1, Hong Nie3, Hao Jiang1, Mingyu Qian1, 4, Hongjun Zhou1
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1Institute of New Energy, State Key Laboratory of Heavy Oil Processing,
Beijing Key Laboratory of Biogas Upgrading Utilization, China University of Petroleum Beijing (CUPB),
Beijing, P. R. China, 102249
2Beijing Jeegreen Technology Development Co., Ltd., Beijing, P. R. China, 102200
3Institute of Agricultural Applied Microbiology, Jiangxi Academy of Agricultural Sciences,
Nanchang, P. R. China, 330200
4Faculty of Agricultural and Environmental Sciences, University of Rostock,
Justus-von-Liebig-Weg 6, 18059 Rostock, Germany
Submission date: 2016-12-27
Acceptance date: 2017-03-09
Online publication date: 2017-08-28
Publication date: 2017-09-28
Pol. J. Environ. Stud. 2017;26(5):2047–2052
A two-phase pressurized biofilm (TPPB) system, including a continuously stirred tank reactor (CSTR) and a pressurized biofilm anaerobic reactor (PBAR), was used to produce high calorific biogas without additional upgrading equipment. The influence of organic loading rate (OLR) on biogas and methane production performance was investigated. Three different OLR levels (4, 5, and 6 g-COD/L/d) were applied to the PBAR in sequence. The headspace pressure of PBAR was controlled at 1.0 MPa. Biogas production, gas composition, and process stability parameters were measured. Results found that the highest methane yield of 332.8 mL/g-COD was obtained at OLR of 5 g-COD/L/d. As compared to approximately 90% methane concentration at OLR of 3.1 g-COD/L/d, the methane content in produced biogas was only 76% at OLR of 5.0 g-COD/L/d. The pH value in the pressurized reactor has an important impact on the quality of produced biogas. Further study should focus on the solution strategies of maintaining suitable pH under higher pressure and higher OLR.