title: Characterisation of water hyacinth with microwave-heated alkali pretreatment for enhanced enzymatic digestibility and hydrogen/methane fermentation.
abstract: Microwave-heated alkali pretreatment (MAP) was investigated to improve enzymatic digestibility and H2/CH4 production from water hyacinth. SEM revealed that MAP deconstructed the lignocellulose matrix and swelled the surfaces of water hyacinth. XRD indicated that MAP decreased the crystallinity index from 16.0 to 13.0 because of cellulose amorphisation. FTIR indicated that MAP effectively destroyed the lignin structure and disrupted the crystalline cellulose to reduce crystallinity. The reducing sugar yield of 0.296 g/gTVS was achieved at optimal hydrolysis conditions (microwave temperature = 190°C, time = 10 min, and cellulase dosage = 5 wt%). The sequentially fermentative hydrogen and methane yields from water hyacinth with MAP and enzymatic hydrolysis were increased to 63.9 and 172.5 mL/gTVS, respectively. The energy conversion efficiency (40.0%) in the two-stage hydrogen and methane cogeneration was lower than that (49.5%) in the one-stage methane production (237.4 mL/gTVS) from water hyacinth with MAP and enzymatic hydrolysis.
authors: State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China.
authors: Richen
authors: R
authors: Lin
authors: State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China. Electronic address: juncheng@zju.edu.cn.
authors: Jun
authors: J
authors: Cheng
authors: State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China; Department of Life Science and Engineering, Jining University, Jining 273155, China.
authors: Wenlu
authors: W
authors: Song
authors: State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China.
authors: Lingkan
authors: L
authors: Ding
authors: State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China.
authors: Binfei
authors: B
authors: Xie
authors: State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China.
authors: Junhu
authors: J
authors: Zhou
authors: State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China.
authors: Kefa
authors: K
authors: Cen
mesh_terms: D056804:Biofuels; D044602:Cellulases / Q000737:chemistry; D002482:Cellulose / Q000737:chemistry; D031806:Eichhornia / Q000737:chemistry* / Q000378:metabolism*; D005285:Fermentation; D006859:Hydrogen / Q000378:metabolism*; D006868:Hydrolysis; D008031:Lignin / Q000737:chemistry; D008697:Methane / Q000378:metabolism*; D008855:Microscopy, Electron, Scanning; D046529:Microscopy, Electron, Transmission; D008872:Microwaves; D017550:Spectroscopy, Fourier Transform Infrared; D013696:Temperature; D014961:X-Ray Diffraction
chemical_list: D056804:Biofuels; C036909:lignocellulose; D006859:Hydrogen; D002482:Cellulose; D008031:Lignin; D044602:Cellulases; D008697:Methane
keywords: Hydrogen; Methane; Microwave-heated alkali pretreatment; Water hyacinth