Monitoring the biofiltration of α-pinene vapours through municipal solid waste and pruning residues composts using an e-nose

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Principal Components Analysis (PCA) carried out using the data sets obtained with a commercial electronic nose after 223 days and structure of α-pinene. R. López1, I. Cabeza1, J. R. Lock-Wah-Hoon1, I. Giráldez 2, M. Ruíz3, M. J. Díaz3

1 Instituto de Recursos Naturales y Agrobiología de Sevilla-CSIC, Avda. Reina Mercedes 10, 41012 Sevilla. .

2 Departamento de Química y Ciencia de los Materiales, Facultad de Ciencias Experimentales, Univ. de Huelva, Campus Universitario El Carmen, Avenida de las Fuerzas Armadas, 21071-Huelva.

3 Departamento de Ingeniería Química, Química Física y Química Orgánica, Facultad de Ciencias Experimentales, Univ. de Huelva, Campus Universitario El Carmen, Avenida de las Fuerzas Armadas, 21071-Huelva.

Keywords: Volatile organic compounds, terpenoid


The volatile organic compound (VOC) α-pinene, one of the most abundant component emitted during the composting of urban waste (MSW) and pruning waste (P), was treated in biofilters filled up with a MSW compost or a MSW+P compost. A photoionization detector was used to carry out the monitoring of the biofilters efficiency but GC-MS and an electronic nose were also used for the process study. Moisture content in biofilters below 66% (dw, MSW) or 51% (dw, MSWP) made efficiency decrease to less than 90%. GC-MS spectra indicated no intermediate products from α-pinene degradation appeared but e-nose data indicates a “smell” corresponding to S-compounds produced in MSW biofilter. These results show that electronic noses could become a powerful tool for the monitoring of VOC compounds in biofiltering and composting processes.

OdaLog® a new portable H2S gas detector

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odalogodalog sewer   The OdaLog® is a portable gas detector specifically designed for the wastewater industry, manufactured by App-Tek International – the industry-proven gas detection specialist for harsh environments.

   Due to the nature of the environment in which the instrument has to operate, the OdaLog® is designed to be intrinsically safe, corrosion-resistant, robust and able to log data for extended periods of time. The OdaLog® is primarily used at a location close to the source of Hydrogen Sulphide (H2S) emissions such as those found within sewerage pumping stations, receiving manholes and inside sewer collection lines. Also, it can be used as personal safety device for confined spaces (OdaLog® 7000 MkII).

Useful Key Issues when Choosing an Electronic Nose

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key issues for selecting o-sensors   In this paper, an innovative device to measure odour emission known as Electronic Nose (ENs) is presented. These devices allows a continuous monitoring in situ of odour emisions and are able to detect quick changes in the emission rate of odours avoiding a time-consuming use of a laboratory. In this article, the author comments the application of different sensors for a each particular case and compare in the use of an EN in different activities. In addition, a short introduction about the different e-noses available in the market is presented.

   Keywords: Odour; Pollution; Sensors; Olfactometry; Statistical Software.

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