猪粪常温厌氧消化处理的有机物迁移转化特征研究

Characteristics of organic matter migration and transformation in anaerobic digestion of pig manure at ambient temperature

为研究猪粪常温厌氧消化过程的有机物迁移转化特征,本文在实验室条件下利用生物发酵罐对猪粪进行常温(18~28℃)厌氧消化处理,对消化液提取液进行紫外-可见全波长分析和三维荧光光谱分析,对猪粪原料和消化液残留固体进行傅里叶红外光谱分析和热重分析。结果表明:常温厌氧消化条件下,猪粪样品的累积产甲烷量为151.12 mL/gVS,日甲烷最高产量为3.75 mL/gVS;消化液中有机物浓度降低,但胡敏素、酪氨酸含量升高;原料中的纤维素和半纤维素不断被分解,木质素则在消化液中沉积下来,同时出现。

In order to identify the characteristics of organic matter migration and transformation in anaerobic digestion of pig manure at ambient temperature, the anaerobic digestion experiment with pig manure was carried out at room temperature(18~28 ℃) using a biological fermentation tank under laboratory conditions. The UV-visible full wavelength analysis and 3 D-EEM fluorescence spectroscopy were performed on the digestive extract, and Fourier Transform-Infrared Spectroscopy and thermogravimetric analysis were used to analyze the pig manure and its solid residue in the anaerobic digestion effluent. Three conclusions were obtained in the end. Firstly, the cumulative methane production of pig manure was 151.12 ml/g VS, and the maximum daily gas production was 3.75 ml/g VS. Secondly, the content of the organic matter reduced in the anaerobic digestion effluent, but those of humin and tyrosine increased;the cellulose and henicellulose in the raw material were constantly degraded, but lignin remained in the residue. Lastly, carbonate deposition was observed in the solid residue of anaerobic digestion.