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采用离子色谱和三维荧光光谱,分别对鸡粪堆肥不同阶段水溶性有机物(DOM)中典型小分子有机酸、磷酸和荧光有机物进行了研究。分析显示,所研究的7种酸(乙酸、琥珀酸、苹果酸、草酸、柠檬酸、酒石酸及磷酸)中,苹果酸的含量最高(>1 000 mg/L),草酸的浓度最低(<3 mg/L),琥珀酸和柠檬酸未检测到。随着堆肥的进行,各种酸的含量先上升而后下降,堆肥结束降至最低;堆肥过程样品所有荧光峰强度之和与COD达到显著相关(R=0.917,P<0.05),类蛋白荧光峰强度与总荧光峰强度的比值不断降低,而类富里酸荧光峰强度与总荧光峰强度的比值不断上升。结果表明,堆肥过程小分子有机酸主要出现在堆肥中期;类蛋白荧光强度或类富里酸荧光强度与总荧光强度之比可以有效表征堆肥腐熟过程。
By using ion chromatography and three-dimensional fluorescence spectroscopy, typical small molecules of organic acids, phosphoric acid and fluorescent organic compounds in different stages of chicken manure composting were studied. The analysis showed that the contents of malic acid (> 1 000 mg / L) and oxalic acid were the lowest (<3) in the seven acids studied (acetic acid, succinic acid, malic acid, oxalic acid, citric acid, tartaric acid and phosphoric acid) mg / L), succinic acid and citric acid were not detected. With the progress of composting, the contents of various acids increased first and then decreased, and the composting ends to a minimum. The sum of all the fluorescence intensities of composting process samples was significantly correlated with COD (R = 0.917, P <0.05) The ratio of the intensity to the total fluorescence peak intensity continuously decreases, while the ratio of the fluorescence intensity of the type fulvic acid to the total fluorescence intensity increases. The results showed that the small organic acids in the compost mainly appeared in the middle stage of compost; the ratio of the fluorescence intensity of the proteinoid or the type of fulvic acid to the total fluorescence could effectively characterize the compost maturation process.