Low-Temperature Pretreatment of Organic Feedstocks with Selected Mineral Wastes Sustains Anaerobic Digestion Stability through Trace Metal Release
| Autor: | Marcos Quintela-Baluja, Jan Dolfing, Reihaneh Bashiri, Evangelos Petropoulos, Shamas Tabraiz, Paul J. Sallis, Neil D. Gray, Burhan Shamurad |
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| Rok vydání: | 2020 |
| Předmět: |
Minerals
Incinerator bottom ash biology Chemistry Methanogenesis Temperature General Chemistry Biodegradable waste 010501 environmental sciences biology.organism_classification Pulp and paper industry 01 natural sciences Methanosaeta Methane Anaerobic digestion chemistry.chemical_compound Bioreactors Metals Fly ash Environmental Chemistry Fermentation Anaerobiosis 0105 earth and related environmental sciences |
| Zdroj: | Environmental Science & Technology. 54:9095-9105 |
| ISSN: | 1520-5851 0013-936X |
| DOI: | 10.1021/acs.est.0c01732 |
| Popis: | A low-cost approach for enhancing mesophilic (37 °C) anaerobic digestion (AD) of organic waste using a low-temperature (37 °C) pretreatment with different mineral wastes (MW) was investigated. A higher and stable methane production rate, in comparison to MW-free controls, was achieved for 80 days at organic loading rates of 1-2 g VS/L·d, using a feed substrate pretreated with incinerator bottom ash (IBA). The boiler ash and cement-based waste pretreatments also produced high methane production rates but with some process instability. In contrast, an incinerator fly ash pretreatment showed a progressive decrease in methane production rates and poor process stability, leading to reactor failure after 40 days. To avoid process instability and/or reactor failure, two metrics had to be met: (a) a methanogenesis to fermentation ratio higher than 0.6 and (b) a cell-specific methanogenic activity to cell-specific fermentation activity ratio of >1000. The prevalence of Methanofastidiosum together with a mixed community of acetoclastic (Methanosaeta) and hydrogenotrophic (Methanobacterium) methanogens in the stable IBA treatment indicated the importance of Methanofastidiosum as a potential indicator of a healthy and stable reactor. |
| Databáze: | OpenAIRE |
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