کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4997550 | 1459911 | 2017 | 10 صفحه PDF | دانلود رایگان |
- The co-digestion of easily- and slowly-degradable substrates is assessed in LBRs.
- A strategy to manage leachate flush and optimize methane production is proposed.
- A high leachate flush-rate at the start-up enhances substrate degradation rates.
- After methanogenesis started, leachate flush-rate can be reduced.
- Mature LBR can be used to degrade external VFAs after the methane production peak.
In anaerobic leach-bed reactors (LBRs) co-digesting an easily- and a slowly-degradable substrate, the importance of the leachate flush both on extracting volatile fatty acids (VFAs) at the beginning of newly-started batches and on their consumption in mature reactors was tested. Regarding VFA extraction three leachate flush-rate conditions were studied: 0.5, 1 and 2 L kgâ1 TS dâ1. Results showed that increasing the leachate flush-rate during the acidification phase is essential to increase degradation kinetics. After this initial phase, leachate injection is less important and the flush-rate could be reduced. The injection in mature reactors of leachate with an acetic acid concentration of 5 or 10 g Lâ1 showed that for an optimized VFA consumption in LBRs, VFAs should be provided straight after the methane production peak in order to profit from a higher methanogenic activity, and every 6-7 h to maintain a high biogas production rate.
Journal: Bioresource Technology - Volume 232, May 2017, Pages 93-102