Evaluation of Hydrothermal Pretreatment on Lignocellulose-Based Waste Furniture Boards for Enzymatic Hydrolysis
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Evaluation of Hydrothermal Pretreatment on Lignocellulose-Based Waste Furniture Boards for Enzymatic Hydrolysis Jingwen Zhao 1,2 & Dong Tian 1,2 & Jinguang Hu 3,4 & Fei Shen 1,2 & Yongmei Zeng 1,2 & Gang Yang 1,2 & Churui Huang 1,2 & Lulu Long 1,2 & Shihuai Deng 1,2 Received: 6 March 2020 / Accepted: 23 April 2020/ # Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract
Three typical waste furniture boards, including fiberboard, chipboard, and blockboard, were pretreated with conventional hydrothermal method. The responses of chemical composition, physicochemical morphology, and performances of enzymatic hydrolysis were evaluated. Results indicated the almost complete hemicellulose removal at higher pretreatment temperatures, the enhanced crystallinity index, and disordered morphology of the pretreated substrates indicated that the hydrothermal pretreatment deconstructed these boards well. However, the very low enzymatic hydrolysis (< 8% after 72 h) of the pretreated substrates showed the poor biological conversion. Three hypotheses for the weakened enzymatic hydrolysis were investigated, and results indicated that the residual adhesives and their degraded fractions were mainly responsible for poor hydrolysis. When NaOH postpretreatment was attempted, cellulose-glucose conversion of the hydrothermally pretreated fiberboard, chipboard and blockboard can be improved to 28.5%, 24.1%, and 37.5%. Herein, the process of NaOH hydrothermal pretreatment was integrated, by which the hydrolysis of pretreated fiberboard, chipboard and blockboard was greatly promoted to 47.1%, 37.3%, and 53.8%, suggesting a possible way to pretreat these unconventional recalcitrant biomasses. Keywords Waste furniture boards . Hydrothermal pretreatment . Post-pretreatment . Integration process . Enzyme-hydrolytic performances
Electronic supplementary material The online version of this article (https://doi.org/10.1007/s12010-02003315-9) contains supplementary material, which is available to authorized users.
* Fei Shen [email protected]; [email protected] Extended author information available on the last page of the article
Applied Biochemistry and Biotechnology
Introduction Buoyed by a strong domestic economy, construction sector, and requirements of furniture, China’s furniture industry has grown rapidly over the past 10 years and has become an important industry to produce many kinds of furniture for demands of domestic and foreign markets [1]. Lignocellulose-based materials played an important role in furniture production, in which 70% share of furniture boards were wood-based materials, and the wood consumption in furniture industry accounted for 10–15% of the total wood industry. However, approximately 6.0 × 107 t (equal to 8.5 × 107 m3) of the used furniture was annually discarded as solid waste in China [2]. The discarded furniture was accompanied by the problems of piled-up randomly without systematic recycling paths and appropriate valorizing technologies, and these issues are urgently confronting the
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