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

作者：Kokko Marika^*; Koskue Veera; Rintala Jukka

来源：Water Research, 2018, 133: 218-226.

DOI：10.1016/j.watres.2018.01.041

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

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 Nasijarvi contains approximately 1.5 million m(3) 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 m(3) of methane from sedimented fibres.

• 出版日期2018-4-15