Lignocellulosic structural changes of Spartina alterniflora after anaerobic mono- and co-digestion |
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| Authors: | Shiguan Yang Jihong Li Zheng Zheng Zhuo Meng |
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| Institution: | 1. State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210093, PR China;2. National Engineering Laboratory of Biomass Power Generation Equipment, Renewable Energy School, North China Electric Power University, Beijing 102206, PR China;1. Advanced Environmental Biotechnology Center, Nanyang Environment and Water Research Institute, Nanyang Technological University, Singapore;2. School of Public Health, Shanghai Jiaotong University, Shanghai, PR China;3. Nanyang Environment and Water Research Institute, Nanyang Technological University, Singapore;4. Sembcorp Industries Ltd., Jurong Island, Singapore;5. School of Civil and Environmental Engineering, Nanyang Technological University, Singapore;1. College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China;2. Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, PR China;1. State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China;2. MaREI Centre, Environmental Research Institute, University College Cork, Cork, Ireland;3. School of Engineering, University College Cork, Cork, Ireland;1. Laboratoire de technologie écologique, Institut d’Ingénierie de l’Environnement, Faculté de l’environnement naturel, architectural et construit (ENAC), Station 2, Ecole Polytechnique Fédérale de Lausanne (EPFL), 1015 Lausanne, Switzerland;2. Laboratoire d’hydraulique environnementale, Institut d’Ingénierie Civile, Faculté de l’environnement naturel, architectural et construit (ENAC), Station 18, Ecole Polytechnique Fédérale de Lausanne (EPFL), 1015 Lausanne, Switzerland;3. Climate Risk Management Unit, Institute for Environment and Sustainability, Joint Research Centre, European Commission, Ispra, Italy;1. Federal University of Paraná, Department of Bioprocess Engineering and Biotechnology, Centro Politécnico, 81531-990 Curitiba, Paraná, Brazil;2. Federal University of Technology – Paraná, Department of Bioprocess Engineering and Biotechnology, 84016-210 Ponta Grossa, Paraná, Brazil |
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| Abstract: | Lignocellulosic structural changes of Spartina alterniflora after anaerobic digestion were investigated by Fourier transform infrared (FTIR) spectroscopy, X-ray diffractometry (XRD), and scanning electron microscopy (SEM). Batch experiments for anaerobic mono-digestion of S. alterniflora and co-digestion with potato at S. alterniflora to potato (SA:P) of 4:1 and 6:1 (based on volatile solids VS]) were performed at 35 ± 1 °C at initial VS of 6%. FTIR spectroscopy study showed that the ratio of lignin to carbohydrate peak area for digested S. alterniflora was more than twice that for the undigested one, and the ratio of lignin to hemicellulosic peak area of samples from co-digestion was approximately twice that from mono-digestion, indicating co-digestion improved hemicellulosic degradation of S. alterniflora. This should attribute to the concentration increase of volatile fatty acids with a peak of about 11 g Ae l?1 for co-digestion compared with 5 g Ae l?1 for mono-digestion. XRD analysis indicated that anaerobic digestion decreased the crystallinity of S. alterniflora by 6.1–8.6%, but the degree of crystallinity decrease for co-digestion was slightly different from that of mono-digestion. SEM observation showed that physical structural destruction of S. alterniflora caused by co-digestion was similar to that caused by mono-digestion, and the degradation of S. alterniflora stem occurred mainly in vascular bundle tissue, whereas the degradation of parenchyma cells was not obvious. |
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