☆ 4.8 Article

Enhanced anaerobic co-digestion of fat, oil, and grease by calcium addition: Boost of biomethane production and microbial community shift

BIORESOURCE TECHNOLOGY (2020)

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Journal

BIORESOURCE TECHNOLOGY
Volume 296, Issue -, Pages -

Publisher

ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2019.122353

Keywords

Fat, oil, and grease; Anaerobic co-digestion; Microbial community; Calcium pretreatment; Biomethane

Categories

Agricultural Engineering Biotechnology & Applied Microbiology Energy & Fuels

Funding

  1. National Research Foundation of Korea (NRF) - Korean government (MEST) [2017R1A2B2004143]
  2. Korea Energy Technology Evaluation and Planning (KETEP) - South Korean government (MSIP) [KETEP-20163010092250]

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This work focused on the application of calcium (0.1-1% w/v) to overcome the inhibition caused by the high loadings (2% v/v) of fat, oil, and grease (FOG) in the context of biomethane production, organic removal, and microbial community shift. Addition of 0.5% calcium showed maximum biomethane production (6-fold increase); biomethane production decreased following the addition of calcium (> 0.5%). The highest organic removal rates were 83 and 89% upon the addition of 0.3 and 0.5% calcium, respectively. Addition of calcium facilitated the growth of bacteria of phylum Firmicutes from the Clostridium, Syntrophomonas, and Sedimentibacter genera. The population of members from the genus Methanosaeta increased after the addition of 0.5% calcium, which is one of the factors responsible for high biomethane production. This study demonstrated that addition of calcium is an attractive strategy to avoid the inhibition of the growth of anaerobic microflora due to the presence of high FOG concentrations.

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