Influence of storage on the physical and chemical properties of Scots pine bark
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Influence of storage on the physical and chemical properties of Scots pine bark Johanna Routa 1
&
Hanna Brännström 2 & Jarkko Hellström 3 & Juha Laitila 1
Received: 30 March 2020 / Accepted: 15 October 2020 # The Author(s) 2020
Abstract Bark is currently used mainly to produce energy, but the extraction of valuable compounds before combustion offers an interesting cascading use for debarking biomass. Buffer storage is an inevitable part of bark biomass logistics, but substantial dry matter and extractive losses can degrade the properties and reduce the economic value of the raw material during storage. In this study, moisture and ash content, calorific value, and extractives content and composition of Scots pine (Pinus sylvestris) sawmill bark were determined over 2 months of buffer storage, and the change in energy content during storage was calculated. The results showed that the energy content (MWh m−3) of the bark increased 3% during storage, while at the same time the moisture content decreased 16%. The content of acetone-soluble extractives decreased markedly, with only 56% of the original amount remaining after 8 weeks of storage. In particular, hydrophilic, phenolic extractive compounds were rapidly lost after debarking and piling of the bark. About 60% of condensed tannins (CT) and about 26% of the quantified lipophilic compounds were lost after 2 weeks of storage. The fastest rate of decrease and the most significant changes in extractives content and composition occurred within the first 2 weeks of storage. Utilization of these valuable compounds necessitates fast supply of material for further processing after debarking. The comprehensive utilization of bark requires efficiency at all levels of the supply chain to ensure that tree delivery times are kept short and loss of bark is avoided during harvest and transport. Keywords Bark . Pinus sylvestris . Moisture . Energy content . Extractives . Debarking
Introduction EU-wide environmental targets and policy objectives for the period from 2021 to 2030 are presented in the 2030 Climate and Energy Framework. One of the key targets is achieving at least a 32% renewable share of energy in the EU [1]. The share of renewable fuels in the Finnish national energy supply was set to be increased to 38% of total energy consumption by Supplementary Information The online version contains supplementary material available at https://doi.org/10.1007/s12155-02010206-8. * Johanna Routa [email protected] 1
Forest Technology and Logistics, Natural Resources Institute Finland, Yliopistokatu 6B, 80101 Joensuu, Finland
2
Biorefinery and bioproducts, Natural Resources Institute Finland, Teknologiakatu 7, 67100 Kokkola, Finland
3
Food processing and quality, Natural Resources Institute Finland Myllytie 1, 31600 Jokioinen, Finland
2020 [2], and this goal was actually achieved in 2014 [3]. The success was achieved mainly by increasing the use of various types of biomass, especially forest chips and forest industry by-products, in energy generation. According to the l
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