Jukka Rintala, Veera Koskue, Marika Kokko, Tampere University, and Chemistry and Bioengineering
Subjects
Paper, Geologic Sediments, Environmental Engineering, 116 Chemical sciences, 0208 environmental biotechnology, Industrial Waste, 02 engineering and technology, 010501 environmental sciences, 01 natural sciences, Methane, chemistry.chemical_compound, Pulp industry, Water Pollutants, Anaerobiosis, Methane production, Waste Management and Disposal, Finland, 0105 earth and related environmental sciences, Water Science and Technology, Civil and Structural Engineering, Methane potential, Liquid fraction, Ecological Modeling, Total dissolved solids, Pollution, 020801 environmental engineering, Lakes, Anaerobic digestion, Boreal, chemistry, Environmental chemistry
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. acceptedVersion
Published
2018
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