厨余垃圾干式厌氧发酵过程中的挥发性脂肪酸测定方法研究

Study on the Determination Method of Volatile Fatty Acids in Dry Anaerobic Fermentation of Kitchen Waste

在厨余垃圾干式厌氧发酵过程中,挥发性脂肪酸浓度是一个重要的监测指标,通过每天测定挥发性脂肪酸浓度可以了解厌氧发酵系统的运行情况。分别采用Nordmann滴定法、气相色谱法和比色法测定了厨余垃圾干式厌氧发酵过程中挥发性脂肪酸的浓度。试验结果表明,由于比色法待测样品预处理过程较多等原因,导致采用比色法测定挥发性脂肪酸浓度的结果较不稳定。气相色谱法操作繁琐、样品预处理过程较多,单个样品试验时间较长,适用于需要测定单种挥发性脂肪酸浓度的情况。Nordmann滴定法能够克服这些缺点,兼具有操作简单、精密度高等优点,因此建议厨余垃圾厌氧发酵过程中挥发性脂肪酸的浓度优先使用Nordmann滴定法进行测定。

During the dry anaerobic fermentation process of kitchen waste,the concentration of volatile fatty acids is an important monitoring index.By determining the concentration of volatile fatty acids daily,the operation situation of the anaerobic fermentation system could be understood.The Nordmann titration method,gas chromatography method,and colorimetric method were used to determine the concentration of volatile fatty acids in dry anaerobic fermentation process of kitchen waste.The experimental results showed that,due to the many pretreatment processes of the samples to be tested,the results of determination of volatile fatty acids by colorimetric method were unstable.Gas chromatography was cumbersome,had more sample pretreatment process,and the experiment time of a single sample was longer,which was suitable for determining the concentration of a single volatile fatty acid.Nordmann titration method could overcome these shortcomings and had the advantages of simple operation and high accuracy.Therefore,it was recommended to prioritize the use of Nordmann titration method to determine the concentration of volatile fatty acids in the anaerobic fermentation process of kitchen waste.