摘要
以玉米秸秆和水稻秸秆为原料在不同温度下制备水热炭,观察原料种类与制备温度对水热炭理化特性的影响并进一步探究水热炭添加对秸秆厌氧发酵产甲烷的强化作用.研究发现,相同温度条件下,玉米秸秆的碳化程度较棉花秸秆更高;同一原料制备的水热炭,表面O-H、C-O含氧官能团丰度随温度升高而降低,但高温有利于材料碳化程度、表面孔隙复杂度的提高与表面碳微球构筑.将不同水热炭分别添加到秸秆厌氧消化系统中,发现水热炭对秸秆厌氧消化产甲烷具有明显强化效果.其中,Y1对秸秆厌氧发酵产甲烷强化效果最佳,累积甲烷产量与最大产甲烷速率较对照组分别提高13.74%与12.06%,发酵过程中VFA降解速度较对照组明显加快且体系应对pH值变化的稳定性增强.微生物群落结构研究发现水热炭添加使秸秆厌氧发酵体系中Firmicutes、Synergistota等产酸功能菌与Methanosarcina、Methanospirillum等氢营养型产甲烷菌得到富集,这可能与水热炭表面丰富的含氧官能团有关.
In this study,different types of hydrochars were prepared from corn straw and cotton straw at different temperatures to clarify the effects of preparation conditions such as temperature,materials on its physicochemical properties and the promotion effects of hydrochars addition on corn straw anaerobic digestion were explored further.The results showed that the carbonization degree of corn straw was higher than that of cotton straw at the same preparation temperature.The oxygen-containing functional groups of hydrochars such as O-H and C-O were decreased when the reaction temperature was elevated but it was conducive to the improvement of carbonization degree,the construction of surface pore structure and the microsphere morphology at the higher temperature.The hydrochars were added to the corn straw anaerobic digestion system,and the corn straw hydrochar prepared at 180℃had the most significant promotion effect which increasing the cumulative methane production and the maximum methane production rate by 13.74%and 12.06%,respectively.Meanwhile,it contributed to the degradation of VFA and stabilized the variance of pH in the anaerobic digestion system.Microbial analysis showed the acidobacterium such as Firmicutes and Synergistota as well as hydrogenotrophic methanogenesis such as Methanosarcina and Methanospirillum were enriched to accelerate the methane production.It may be related to the abundant oxygen-containing group of hydrochar.
作者
耿涛
赵立欣
姚宗路
申瑞霞
于佳动
罗娟
GENG Tao;ZHAO Li-xin;YAO Zong-lu;SHEN Rui-xia;YU Jia-dong;LUO Juan(Institute of Environment and Sustainable Development in Agriculture,Chinese Academy of Agricultural Sciences,Key Laboratory of Low-carbon Green Agriculture in North China,Ministry of Agriculture and Rural Affairs P.R.China,Beijing 100081,China)
出处
《中国环境科学》
EI
CAS
CSCD
北大核心
2024年第8期4415-4424,共10页
China Environmental Science
基金
国家自然科学基金-青年科学基金项目(32301727)
中央级公益性科研院所基本科研业务费专项(BSRF202221)
中国农业科学院科技创新工程。
关键词
农业废弃物
秸秆
水热炭
厌氧发酵
产甲烷
agricultural wastes
corn starw
anaerobic digestion
hydrochar
methanogenesis