Environmental Sciences and Management Department, University of Liège, Arlon campus environnement, Avenue de Longwy 185, 6700 Arlon, Belgium.
Bioprocess Biosyst Eng. 2013 Jan;36(1):23-33. doi: 10.1007/s00449-012-0757-6. Epub 2012 May 30.
This study aimed at analysing the utilization of an electronic nose (e-nose) to serve as a specific monitoring tool for anaerobic digestion process, especially for detecting organic overload. An array of non specific metal oxide semiconductor gas sensors were used to detect process faults due to organic overload events in twelve 1.8-L anaerobic semi-continuous reactors. Three different load strategies were followed: (1) a cautious organic load (1.3 gVS L(-1) day(-1)); (2) an increasing load strategy (1.3-5.3 gVS L(-1) day(-1)) and (3) a cautious organic load with load pulses of up to 12 gVS L(-1) day(-1). A first monitoring campaign was conducted with three different substrates: sucrose, maize oil and a mix of sucrose/oil during 60 days. The second campaign was run with dry sugar beet pulp for 45 days. Hotelling's T(2) value and upper control limit to a reference set of digesters fed with a cautious OLR (1.3 gVS L(-1) day(-1)) was used as indirect state variable of the reactors. Overload situations were identified by the e-nose apparatus with Hotelling's T(2) values at least four times higher in magnitude than the upper control limit of 23.7. These results confirmed that the e-nose technology appeared promising for online detection of process imbalances in the domain of anaerobic digestion.
本研究旨在分析电子鼻（e-nose）作为一种特定的监测工具在厌氧消化过程中的应用，特别是用于检测有机过载。采用一系列非特异性金属氧化物半导体气体传感器，在 12 个 1.8-L 厌氧半连续反应器中检测由于有机过载事件而导致的工艺故障。采用了三种不同的负荷策略：（1）谨慎的有机负荷（1.3 gVS L（-1）天（-1））；（2）递增负荷策略（1.3-5.3 gVS L（-1）天（-1））；（3）谨慎的有机负荷，负荷脉冲高达 12 gVS L（-1）天（-1）。在 60 天内，使用三种不同的基质（蔗糖、玉米油和蔗糖/油混合物）进行了第一次监测活动。第二次活动使用干甜菜浆进行了 45 天。以谨慎的 OLR（1.3 gVS L（-1）天（-1））喂养的一批参考消化器的 Hotelling T（2）值和上限控制限被用作反应器的间接状态变量。过载情况通过电子鼻装置识别，Hotelling T（2）值至少比 23.7 的上限控制限高四倍。这些结果证实，电子鼻技术有望用于在线检测厌氧消化领域的工艺失衡。
