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Research r...Environmen...1000 Olfactometry Analyses

1000 Olfactometry Analyses and 100 TD-GC/MS Analyses to Evaluate Methods for Reducing Odour from Finishing Units in Denmark

Odour from pig production is one of the biggest barriers to expanding pig production units in Denmark. There is a great need to develop methods to reduce odour emission. However, it is very important that the solutions are economically feasible.

Abstract

During the last four years, the National Committee for Pig Production has carried out approximately 1000 olfactometry analyses of air samples from commercial pig production units. The measurements have primarily been carried out in finishing units because approximately 70% of odour originates from this part of an integrated pig production unit.

The aim was to evaluate different methods for reducing the odour emission. Case-control studies were performed to test different methods, and an intensive campaign measurement programme was conducted to investigate whether an idea for odour reduction has a potential for development.

In the case-control studies, the farms were visited every second week over a period of six months. Each time, the following samples and registrations were made: 1) air sample was collected in 30-litre tedlar bags during a 40-minute period, and analysed in accordance with European CEN standard for olfactometry the following day, 2) ventilation rate was determined using calibration measuring fans from Fancom and 3) ammonia and carbon dioxide concentrations were measured using detection tubes from Kitagawa and electronic equipment from the Veng system. During the last year of the project, the measurement protocol was enlarged to include sampling on adsorption tubes and analysis by gas chromatography and mass spectrometry (TD-GS/MS).

The overall conclusions of the tests were that 1) The odour emission is 3-5 times higher during the summer than during the winter, 2) There is a linear correlation between air exchange and odour emission, 3) The odour emission from a finishing unit with slurry system is the same before and after delivery of pigs as long as the ventilation rate is maintained, 4) Management factors are essential for controlling the odour emission from finishing units. 5) Biological purification of exhausted air is the only odour-cleaning technique that can be recommended, 6) Scrubbers with one filter using sulphuric acid can only be used for ammonia reduction and not for odour reduction, 7) comparison of odour strengths determined by olfactometry and TD-GS/MS indicated that phenols, indoles and volatile fatty acids do not play a major role for the odour emission. This part will be discussed in the presentation, however not in the proceedings.

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Author

Merete Lyngbye

Chief Project Manager

Tlf.: +45 3339 4361

E-mail: mel@lf.dk

Author

Anders Leegaard Riis

Senior Project Manager 

Tlf.: +45 3339 4385

E-mail: anr@lf.dk

Author

Thomas Ladegaard Jensen

Senior Consultant 

Tlf.: +45 3339 4938

E-mail: tlj@lf.dk

Author

Gunner Sørensen

Programme manager

Tel.: +45 3339 4398

E-mail: gs@seges.dk

 

Author

Michael Jørgen Hansen

Statistik