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Anaerobic Digestion of Steam-Exploded Wheat Straw and Co-Digestion Strategies for Enhanced Biogas Production
| Content Provider | MDPI |
|---|---|
| Author | Kaldis, Fokion Cysneiros, Denise Day, James Karatzas, Kimon-Andreas G. Chatzifragkou, Afroditi |
| Copyright Year | 2020 |
| Description | Wheat straw (WS) is considered a favourable substrate for biogas production. However, due to its rigid structure and high carbon to nitrogen (C/N ratio), its biodegradability during anaerobic digestion (AD) is usually low. In the present study, the effect of steam explosion pre-treatment on WS, combined with C/N adjustment with inorganic nitrogen, on biogas production was evaluated. Additionally, co-digestion of WS with protein-rich agri-industrial by-products (dried distillers’ grains with solubles (DDGS) and rapeseed meal (RM)) was assessed. Steam explosion enhanced biogas production from WS, whereas the addition of NH4Cl was beneficial (p < 0.05) for the digestion of steam-exploded wheat straw (SE). Furthermore, mono-digestion of the four different substrates seemed to be efficient in both inoculum to substrate ratios (I/S) tested (3.5 and 1.75 (w/w)). Finally, during co-digestion of WS and SE with DDGS and RM, an increase in the cumulative methane production was noted when higher amounts of DDGS and RM were co-digested. This study demonstrated that DDGS and RM can be used as an AD supplement to stimulate gas production and improve wheat straw biodegradability, while their addition at 10% on an AD system operating with WS can enhance gas yields at levels similar to those achieved by steam-exploded straw. |
| Starting Page | 8284 |
| e-ISSN | 20763417 |
| DOI | 10.3390/app10228284 |
| Journal | Applied Sciences |
| Issue Number | 22 |
| Volume Number | 10 |
| Language | English |
| Publisher | MDPI |
| Publisher Date | 2020-11-22 |
| Access Restriction | Open |
| Subject Keyword | Applied Sciences Paper and Wood Anaerobic Digestion Co-digestion Steam Explosion C/n Wheat Straw Rapeseed Meal Ddgs Biogas |
| Content Type | Text |
| Resource Type | Article |
