论文部分内容阅读
利用傅里叶变换显微红外光谱技术对鸡粪沼渣好氧堆肥颗粒尺度下氧气渗透深度进行了量化表征。用于表征鸡粪沼渣颗粒氧气渗透深度的显微红外透射光谱法光谱采集范围为750~4000cm-1,光谱分辨率16 cm-1,像素点大小6.25μm×6.25μm,扫描次数16次。鸡粪沼渣好氧堆肥样品经冷冻干燥处理后,应采用石蜡切片技术制成12μm薄片,选取2856 cm-1和1640cm-1代表脂肪类化合物,1568 cm-1和3001cm-1代表芳香族化合物作为氧气渗透深度边界判定特征波长,且氧气渗透深度终点定义为差分曲线迅速下降的一点。鸡粪沼渣颗粒氧气渗透深度较小,介于7~20μm范围内动态变化,其符合指数关系式。研究结果表明,采用傅里叶显微红外透射光谱法判定好氧堆肥颗粒氧气渗透深度具有可行性,但应根据不同物料特性,选用适用的方法和技术参数。
The oxygen infiltration depth under aerobic composting of chicken manure biogas slurry was quantitatively characterized by Fourier transform infrared spectroscopy. The microscopic infrared transmission spectroscopy spectral range of 750 ~ 4000cm-1, spectral resolution 16 cm-1, pixel size of 6.25μm × 6.25μm and number of scanning times of 16 were used to characterize the oxygen penetration depth of chicken dregs. The aerobic composting samples of chicken manure biogas residues should be made into 12μm slices by paraffin section technique after freeze-drying. 2856cm-1 and 1640cm-1 were selected for the fat compounds, and 1568cm-1 and 3001cm-1 for the aromatic compounds The characteristic wavelength is determined as the oxygen penetration depth boundary and the oxygen penetration depth endpoint is defined as the point where the difference curve rapidly decreases. The osmotic pressure of chicken manure biogas residue is smaller, ranging from 7 ~ 20μm, which is consistent with the exponential relationship. The results show that it is feasible to determine the oxygen penetration depth of aerobic compost particles by Fourier transform infrared transmission spectroscopy. However, the suitable methods and technical parameters should be selected according to different material characteristics.