Biohydrogen production from specified risk materials co-digested with cattle manure |
| |
Authors: | Brandon H. Gilroyed Chunli Li Xiying Hao Angus Chu Tim A. McAllister |
| |
Affiliation: | 1. Agriculture and Agri-Food Canada, Lethbridge Research Centre, P.O. Box 3000, Lethbridge, Alberta T1J 4B1, Canada;2. Department of Civil Engineering, Schulich School of Engineering, University of Calgary, Calgary, Alberta T2N 1N4, Canada |
| |
Abstract: | Biohydrogen production from the anaerobic digestion of specified risk materials (SRM) co-digested with cattle manure was assessed in a 3 × 5 factorial design. Total organic loading rates (OLR) of 10, 20, and 40 g L−1 volatile solids (VS) were tested using manure:SRM (wt/wt) mixtures of 100:0 (control), 90:10, 80:20, 60:40, and 50:50 using five 2 L continuously stirred biodigesters operating at 55 °C. Gas samples were taken daily to determine hydrogen production, and slurry samples were analyzed daily for volatile fatty acid (VFA) concentration, total ammonia nitrogen (TAN), and VS degradation. Hydrogen production (mL g−1 VS fed) varied quadratically according to OLR (P < 0.01), with maximum production at OLR20, while production decreased linearly (P < 0.0001) as SRM concentration increased. Reduced hydrogen production associated with SRM inclusion at >10% VS may be attributed to a rapid increase in TAN (r = −0.55) or other inhibitors such as long chain fatty acids. Reduced hydrogen production (P < 0.01) at OLR40 versus OLR20 may be related to increased rate of VFA accumulation and final VFA concentration (P < 0.001), as well as inhibition due to hydrogen accumulation (P < 0.001). Biohydrogen production from SRM co-digested with cattle manure may not be feasible on an industrial scale due to reduced hydrogen production with increasing levels of SRM. |
| |
Keywords: | SRM Hydrogen Anaerobic digestion Fermentation |
本文献已被 ScienceDirect 等数据库收录! |
|