谷类秸秆接种瘤胃液的厌氧消化性能和三维荧光光谱特征

doi:10.11934/j.issn.1673-4831.2018.11.011

Abstract

Abstract:

The performance of volatile fatty acids (VFAs) and methane production during anaerobic digestion of cereal straw (rice, wheat and sorghum straw) and its three-dimensional excitation emission matrix fluorescence spectroscopic characteristics were investigated in an automatic biochemical methane potential test system inoculated with rumen fluid. The results show that, rumen microorganism from dairy cattle owns strong hydrolysis and acidification ability for cereal straw. After 5 d of anaerobic digestion, the amount of total VFAs (TVFAs) for rice, wheat and sorghum straw were 410.9, 430.9, and 472.0 mg·g^-1 volatile solids (VS), respectively. The modified Gompertz model fits well to methane producing profile of cereal straw. After 55 d of operation, the corresponding methane yields were 66.29, 103.79, and 76.89 mL·g^-1 VS, respectively. Three fluorescence components, i. e., tyrosine-like, tryptophan-like and humic-like substances with low molecular weight, were identified in dissolved organic matter, using three-dimensional excitation emission matrix (EEM) fluorescence coupled with parallel factor analysis (PARAFAC). The relationship between fluorescence intensity of the tryptophan-like materials and TVFAs could be well expressed by a power function. The humidification index (HIX) of dissolved organic matter decreased after 5 d and then increased gradually during anaerobic digestion.

Key words: cereal straw, rumen microorganism, anaerobic digestion, methane, volatile fatty acids

CLC Number:

X705

SU Liang-hu, CHEN Mei, SUN Xu, CHEN Yu-dong, ZHANG Long-jiang. The Anaerobic Digestion Performance of Cereal Straw Inoculated With Rumen Fluid and Its Three-Dimensional Excitation Emission Matrix Fluorescence Spectroscopic Characteristics[J]. Journal of Ecology and Rural Environment, 2018, 34(11): 1034-1041.

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The Anaerobic Digestion Performance of Cereal Straw Inoculated With Rumen Fluid and Its Three-Dimensional Excitation Emission Matrix Fluorescence Spectroscopic Characteristics

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