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Effects of thermal hydrolytic pre-treatment on biogas process efficiency and microbial community structure in industrial- and laboratory-scale digesters
SLU Swedish University of Agricultural Sciences, Sweden.
RISE - Research Institutes of Sweden, Bioscience and Materials, Agrifood and Bioscience.
Sundets Biogas, Sweden.
Cambi Group, Norway.
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2019 (English)In: Waste Management, ISSN 0956-053X, E-ISSN 1879-2456, Vol. 95, p. 150-160Article in journal (Refereed) Published
Abstract [en]

This study examined the impact of thermal hydrolysis process (THP) pre-treatment on anaerobic co-digestion of wastewater sludge and household waste and assessed whether THP was vital to achieve higher process capacity. Performance data were collected for both industrial- and laboratory-scale digesters and response in microbial community structure was evaluated by Illumina sequencing. Implementation of THP at the industrial-scale plant increased methane yield by 15% and enhanced substrate degradability. Possibility to extend the sludge retention time due to a higher solid content of the substrate, sanitisation of the digestate and improved fertiliser quality of the digestate were other industrial-scale benefits of THP installation. Continuously-fed laboratory-scale digesters were fed THP-treated or untreated substrate at an organic loading rate (OLR) of 5 g volatile solid (VS)/L/day, a feeding rate necessary at the corresponding industrial-scale plant to meet the estimated population increase within the municipality. The results indicated that the plant could have increased the capacity with unimpaired stability independently of THP installation, even though the retention time was significantly shortened during operation with untreated substrate. Microbial community analyses revealed increased contribution of the Clostridia class after THP installation in industrial-scale digesters and positive correlation between Firmicutes:Bacteriodetes and methane yield in all digesters. Differentiated profiles in laboratory-scale digesters indicated that a temperature increase from 37 to 42 °C in association with THP installation and altered substrate composition were strong determining factors shaping the microbial community. Overall, these findings can assist industrial-scale plants in choosing management strategies aimed at improving the efficiency of anaerobic digestion processes.

Place, publisher, year, edition, pages
Elsevier Ltd , 2019. Vol. 95, p. 150-160
Keywords [en]
Anaerobic degradation, Household waste, Organic loading rate, Sewage sludge, Temperature, Thermal hydrolytic process, Biogas, Efficiency, Industrial plants, Laboratories, Methane, Microorganisms, Sludge digestion, Wastewater treatment, Anaerobic digestion process, Hydrolytic process, Laboratory scale digesters, Microbial community analysis, Microbial community structures, Organic loading rates, Anaerobic digestion, Clostridia, Firmicutes
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-39266DOI: 10.1016/j.wasman.2019.06.004Scopus ID: 2-s2.0-85066983253OAI: oai:DiVA.org:ri-39266DiVA, id: diva2:1334707
Note

Funding details: Sveriges Lantbruksuniversitet; Funding details: Energimyndigheten, 38011.1; Funding details: Svenskt Vatten, 14-112; Funding text 1: We thank Mats Edström at Research Institutes of Sweden (RISE), Uppsala, Sweden, for assistance with project coordination and Johnny Ascue, Xinmei Feng and Leticia Pizzul for technical support. Johnny Isaksson is acknowledged for design of the graphical abstract. This work was financially supported by the Swedish University of Agricultural Sciences, Växjö municipality, Sweden, Cambi AS, the Swedish Energy Agency (grant number 38011.1 ) and the Swedish Water and Wastewater Association (SWWA, grant number 14-112 ). Appendix A

Available from: 2019-07-03 Created: 2019-07-03 Last updated: 2019-07-03Bibliographically approved

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