TY - CONF

T1 - Merging and elevation of ventilation chimneys as method to reduce odour nuisance from pig production

AU - Bjerg, Bjarne Schmidt

PY - 2016

Y1 - 2016

N2 - Danish farmers that wish to establish or expand animal production facilities have to document that the expected odournuisances at the neighbours are kept below certain thresholds. To do so the expected odour emission must be calculatedfrom norm figures for expected odour emission from the wished production, and a certain atmospheric dispersion model(OLM) must be used to calculate whether the requirements are fulfilled. The farmers can choose to use the dispersionmodel for a calculation that takes into account individual preconditions as locations and design of ventilations chimneys.Alternatively they can use standard curves that gives the required distance to neighbours calculated at standardizedpreconditions. If the thresholds are not met, the farmer can include environmental technologies mentioned on a speciallist maintained by the environmental authorities. Currently biological air cleaners are the sole technology mentioned onthe list that significantly can reduces the odour emission and the consequent required distance to the neighbours. Analternative to the relative expensive biological air cleaners is to release the air at a larger height which increases thedilution of odour before it reaches the neighbours. Low potentials found in elder analyses in relatively small herds mightexplain why the method is not already frequently used. Larger herds improve the possibilities to use larger chimneys andgenerate a larger vertical momentum which increases the effective release height.The aim of this work is to enlighten the potential of merging and elevation of ventilation chimneys in order to reduceodour concentration around large pig production facilities. The analyses are based on an assumed facility with aninstalled ventilation capacity of 720000 m3h-1, which, in the reference case, is assumed to be released from 60 chimneys0.7 m above the roof. Merging these chimneys to four or fewer 10 m high chimneys reduces the odour nuisance distanceto the neighbours by 59-67 %.

AB - Danish farmers that wish to establish or expand animal production facilities have to document that the expected odournuisances at the neighbours are kept below certain thresholds. To do so the expected odour emission must be calculatedfrom norm figures for expected odour emission from the wished production, and a certain atmospheric dispersion model(OLM) must be used to calculate whether the requirements are fulfilled. The farmers can choose to use the dispersionmodel for a calculation that takes into account individual preconditions as locations and design of ventilations chimneys.Alternatively they can use standard curves that gives the required distance to neighbours calculated at standardizedpreconditions. If the thresholds are not met, the farmer can include environmental technologies mentioned on a speciallist maintained by the environmental authorities. Currently biological air cleaners are the sole technology mentioned onthe list that significantly can reduces the odour emission and the consequent required distance to the neighbours. Analternative to the relative expensive biological air cleaners is to release the air at a larger height which increases thedilution of odour before it reaches the neighbours. Low potentials found in elder analyses in relatively small herds mightexplain why the method is not already frequently used. Larger herds improve the possibilities to use larger chimneys andgenerate a larger vertical momentum which increases the effective release height.The aim of this work is to enlighten the potential of merging and elevation of ventilation chimneys in order to reduceodour concentration around large pig production facilities. The analyses are based on an assumed facility with aninstalled ventilation capacity of 720000 m3h-1, which, in the reference case, is assumed to be released from 60 chimneys0.7 m above the roof. Merging these chimneys to four or fewer 10 m high chimneys reduces the odour nuisance distanceto the neighbours by 59-67 %.

M3 - Paper

Y2 - 26 June 2016 through 29 June 2016

ER -