The main DOSS objective is to develop and evaluate gas sensors and sensor systems (collectively called electronic noses) for industrial applications, specifically a system for on-line process control. The sensors should provide real-time measurement assessment of odours at the source and possibly at the receptor location. Bio-filter outlet is estimated to be less than 5000 OU/m3 (Odour Units).
The DOSS uses six QMB sensors, six MOS sensors and four chemical/infrared/capacitive sensors for measuring O2, H2O, CO, CO2. The data during instrument development is gathered from sample bags and compared with reference odour concentrations (OU/m3). Results from experiments are presented. Principal components analysis (PCA) and partial least squares (PLS) regression plots indicate good classification and prediction expectation. Preliminary results on interfering compounds, e.g. H2O, H2S and CO2 are shown.
The method was thus far developed and evaluated under laboratory conditions. Generally, the results obtained with the electronic nose measurement method showed a good repeatability and a potential to get useful results comparable with odour emission over the range 1000–30,000 OU/m3.
Experiments with the DOSS have shown that the method has a high potential as fast, reliable odour-monitoring tool for rendering plant emission monitoring.