猪粪与秸秆协同发酵产热及溶解性有机质的转化特征

Pig Manure and Straw Ferment Produce Heat Collaboratively and Transformation of Dissolved Organic Matter

采用量热计法和三维荧光光谱,分别对猪粪发酵产热不同阶段温度、热值以及溶解性有机质(DOM)的转化特征进行了研究.结果表明:在不同C/N(猪糞与芦苇秸秆物料配比)的4组发酵产热试验中,纯猪粪发酵产热温度高于室温时间达到60 d,累积热量损失最多达8.862 kJ/g,是增温技术最为理想的配比;随着发酵产热的进行,纯猪粪发酵产热样品中类蛋白化合物荧光比值(P1,n+P2,n,0.625～0.546)逐渐减少,类富里酸物质荧光比值(P3,n,0.140～0.173)与类胡敏酸物质荧光比值(P5,n,0.051～0.097)逐渐增多,腐殖化程度逐渐加强,但是与其他各组相比其腐殖酸类物质增加最少,腐殖化程度最低;不同C/N物料产热过程中,尽管不同区域的荧光强度与热值的相关性不同,但不同C/N物料释放的热量均来源于微生物对简单有机化合物的分解.

Using the calorimeter method and three-dimensional fluorescence spectra technology, characteristics of temperature, heat quantity and dissolved organic matter （DOM） change at different stages of pig manure fermentation process was researched, respectively. The results showed that under different conditions for the C/N in four groups of heat production by fermentation experiments, the time during pure pig manure fermentation with the temperature higher than room temperature lasted for 60 days. However, the loss of cumulative heat appeared to be up to 8. 862 kJ/g, which was the most ideal ratio for this warming technology. With the heat production of pig manure fermentation, protein-like compound （P1,n ＋ P2,n,0. 625-0. 546） gradually decreased in the samples, while fulvic acid-like substance （ P3,, 0. 140-0. 173 ） and humic acid-like substance （ P5,n, 0. 051-0. 097 ） reversely increased. During this process, humification degree was gradually strengthened, but compared with the other groups, the humic acids increased the least and the humification degree was lowest. Additionally, the correlation between fluorescence intensity in different regions and the value of heat production were dissimilar of different ratios of C/N of material, but the released heat of different C/N material was totally derived from the matters decomposed from simple organic compounds by microorganisms.