title: [Effect of NaOH-treatment on dry-thermophilic anaerobic digestion of Spartina alterniflora].
abstract: In order to improve the biotransformation rate of lignocellulosic materials, sodium hydroxide (NaOH) was widely used to pretreat lignocellulosic materials. Effect of NaOH-treatment on dry-thermophilic anaerobic digestion of Spartina alternflora was studied by batch model under the temperature of 55 degrees C +/- 1 degrees C, at the initial total solid loading (TSL) of 20%. The results indicated that biogas production was inhibited by NaOH-treatment and improved by NaOH-treatment with water washed. The cumulative biogas yield of control (CK), NaOH-treated and NaOH-treated with water washed (NaOH + water) were 268.35 mL/g, 205.76 mL/g and 299.97 mL/g, respectively. The methane content of CK and NaOH + water treatments kept stable while fluctuation of NaOH-treated treatment during anaerobic digestion process was observed. Compared with CK and NaOH + water treatments, methane content of NaOH-treated treatment was improved by 5.30%. The content of hemi-cellulose and cellulose of S. alternifora decreased while content of lignin of S. alterniflora increased after 51-day anaerobic digestion. The crystallinity of cellulose of S. alterniflora increased after NaOH-treatment which was consistent to the result of FTIR. The lignocellulosic structure was destroyed and the biodegradability of S. alterniflora was increased by NaOH pretreatment. However, the amount of Na+ was taken into the anaerobic system, besides the high Na+ content in the plant itself which inhibited the anaerobic microorganisms. Therefore, NaOH-treatment is considered to be unsuitable for the anaerobic digestion of S. alterniflora.
authors.affiliation: Jiangsu Agricultural Waste Treatment and Recycle Engineering Research Center, Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China. chengy522@gmail.com
authors.forename: Guang-Yin
authors.initials: GY
authors.lastname: Chen
authors.forename: Zheng
authors.initials: Z
authors.lastname: Zheng
authors.forename: Zhi-Zhou
authors.initials: ZZ
authors.lastname: Chang
authors.forename: Xiao-Mei
authors.initials: XM
authors.lastname: Ye
authors.forename: Yan
authors.initials: Y
authors.lastname: Luo
mesh_terms: D000693:Anaerobiosis; D001673:Biodegradation, Environmental; D056804:Biofuels / Q000032:analysis*; D002482:Cellulose / Q000378:metabolism*; D005285:Fermentation; D006109:Poaceae / Q000187:drug effects / Q000378:metabolism*; D012972:Sodium Hydroxide / Q000737:chemistry*
chemical_list: D056804:Biofuels; D012972:Sodium Hydroxide; D002482:Cellulose