Abstract
Eucalyptus residues from pulp mill were pretreated with aqueous ammonia soaking (AAS) method to improve the efficiency of enzymatic hydrolysis. The optimized condition of AAS was obtained by response surface methodology. Meanwhile, hydrogen peroxide was introduced into the AAS system to modify the AAS pretreatment (AASP). The results showed that a fermentable sugar yield of 64.96 % was obtained when the eucalypt fibers were pretreated at the optimal conditions, with 80 % of ammonia (w/w) for 11 h and keeping the temperature at 90 °C. In further research it was found that the addition of H2O2 to the AAS could improve the pretreatment efficiency. The delignification rate and enzymatic digestibility were increased to 64.49 % and 73.85 %, respectively, with 5 % of hydrogen peroxide being used. FTIR analysis indicated that most syringyl and guaiacyl lignin and a trace amount of xylan were degraded and dissolved during the AAS and AASP pretreatments. The CrI of the raw material was increased after AAS and AASP pretreatments, which was attributed to the removal of amorphous portion. SEM images showed that microfibers were separated and explored from the initial fiber structure after AAS pretreatment, and the AASP method could improve the destructiveness of the fiber surface.
Funding source: Chinese Academy of Sciences
Award Identifier / Grant number: Y607kb1001
Award Identifier / Grant number: Y607ka1001
Funding source: South China University of Technology
Award Identifier / Grant number: 201607
Funding source: Nanjing Forestry University
Award Identifier / Grant number: JSBGFC14011
Funding source: Chinese Academy of Forestry
Award Identifier / Grant number: JSBEM201507
Funding source: Zhejiang University of Science and Technology
Award Identifier / Grant number: 2016REWB22
Funding source: Tianjin University of Science and Technology
Award Identifier / Grant number: 2014CXLG14
Funding source: Chinese Academy of Sciences
Award Identifier / Grant number: KLBM20160011
Funding statement: We are grateful for the financial support provided by The National Key Research and Development Plan (2017YGB0307900), Open Foundation of Key Laboratory of Renewable Energy, Chinese Academy of Sciences (Y607kb1001, Y607ka1001), Open Foundation of the State Key Laboratory of Pulp and Paper Engineering in South China University of Technology (201607), Open Foundation of the Jiangsu Key Lab of Biomass-based Green Fuels and Chemicals in Nanjing Forestry University (JSBGFC14011); Jiangsu Province Biomass Energy and Materials Laboratory in Institute of Chemical Industry of Forest Products, CAF (JSBEM201507); Open Foundation of Key Laboratory of Recycling and Eco-treatment of Waste Biomass of Zhejiang Province in Zhejiang University of Science and Technology (2016REWB22); Innovation Foundation for Young Teachers in Tianjin University of Science & Technology (2014CXLG14); CAS Key Laboratory of Bio-based Materials (KLBM20160011).
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Conflict of interest: The authors declare no conflicts of interest.
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