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Anaerobic digestion of 30−100-year-old boreal lake sedimented fibre from the pulp industry: Extrapolating methane production potential to a practical scale

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Details

Original languageEnglish
Pages (from-to)218-226
Number of pages9
JournalWater Research
Volume133
DOIs
Publication statusPublished - 15 Apr 2018
Publication typeA1 Journal article-refereed

Abstract

Since the 1980s, the pulp and paper industry in Finland has resulted in the accumulation of fibres in lake sediments. One such site in Lake Näsijärvi contains approximately 1.5 million m3 sedimented fibres. In this study, the methane production potential of the sedimented fibres (on average 13% total solids (TS)) was determined in batch assays. Furthermore, the methane production from solid (on average 20% TS) and liquid fractions of sedimented fibres after solid-liquid separation was studied. The sedimented fibres resulted in fast methane production and high methane yields of 250 ± 80 L CH4/kg volatile solids (VS). The main part (ca. 90%) of the methane potential was obtained from the solid fraction of the sedimented fibres. In addition, the VS removal from the total and solid sedimented fibres was high, 61–65% and 63–78%, respectively. The liquid fraction also contained a large amount of organics (on average 8.8 g COD/L), treatment of which also has to be considered. The estimations of the methane production potentials in the case area showed potential up to 40 million m3 of methane from sedimented fibres.

Keywords

  • Anaerobic digestion, Methane, Pulp and paper industry, Sedimented fibre

Publication forum classification

Field of science, Statistics Finland