Analyse ammoniakemissieniveaus van praktijkbedrijven in de varkenshouderij (1990-2003)

The main objectives of this study are: to gain insight in the variance structure of ammonia emission for the four main pig categories by analyzing available datasets (1990- 2003) measured in the Netherlands, to estimate the accuracy of the current measurement protocol of ammonia emission and to gain insight in the effects of modifying protocols on their accuracy. Results from the statistical analysis were used to test the accuracy of alternative measurement protocols based on different sampling strategies. To minimize the measurement error associated with ammonia emission measurements, it is proposed to increase the number of locations involved in the measurement schem

Protocol voor meting van lachgasemissie uit huisvestingssystemen in de veehouderij 2010 = Measurement protocol for nitrous oxide emission from housing systems in livestock production 2010

This report describes a measurement protocol for nitrous oxide emissions from animal housing systems. The protocol is based on sampling periods of 24 hours spread over one year and can be applied in specified animal categories

Protocol voor meting van methaanemissie uit huisvestingssystemen in de veehouderij 2010 = Measurement protocol for methane emission from housing systems in livestock production 2010

This report describes a measurement protocol for methane emissions from animal housing systems. The protocol is based on sampling periods of 24 hours spread over one year and can be applied in specified animal categories

Options for dust reduction from poultry houses

Large poultry houses emit high amounts of fine dust (PM10) and in many cases they exceed the ambient air quality standard set by the EU. Technologies for PM10 reduction need to be developed on short term to minimize PM10 emissions from poultry houses. Studied options for dust reduction were: application of an oil film on the litter and application of an ionization system. Rapeseed oil was sprayed daily in a quantity of 8 to 24 ml/m2 in broiler houses and 20 ml/m2 in layer houses. The ionization system was applied in a broiler house and had a voltage difference of -30kV, with a current of approximately 0.7 mA. Daily emissions of PM10 particles were determined at regular intervals by measuring concentrations at the ventilation inlet and outlet and by measuring the airflow rate. For the oil system PM10 emission reductions were in the ranges of 55 – 85% in broilers and 25 – 40% in layers. The ionization system, applied in broilers, reduced PM10 emission on average by 36%

Protocol voor meting van ammoniakemissie uit huisvestingssystemen in de veehouderij 2010 = Measurement protocol for ammonia emission from housing systems in livestock production 2010

A new measurement protocol for the determination of ammonia emissions of animal housing systems is elaborated. The main deviation from previous approaches is the requirement of multi-farmsite sampling. This report describes the new protocol for different animal categories

Comparison of CO2- and SF6- based tracer gas methods for the estimation of ventilation rates in a naturally ventilated dairy barn

Livestock production is a source of numerous environmental problems caused by pollutant gas emissions. In naturally ventilated buildings, estimating air flow rate is complicated due to changing climatic conditions and the difficulties in identifying inlets and outlets. To date no undisputed reference measurement method has been identified. The objective of this paper was to compare CO2- and SF6-based tracer gas methods for the estimation of ventilation rates (VRCO2 vs. VRSF6 ) in naturally ventilated dairy barns both under conventional and very open ventilation situations with different spatial sampling strategies. Measurements were carried out in a commercial dairy barn, equipped with an injection system for the controlled release of SF6, and measurement points for the monitoring of SF6 and CO2 concentrations to consider both horizontal and vertical variability. Methods were compared by analysing daily mean VRCO2=VRSF6 ratios. Using the average gas concentration over the barn length led to more accurate ventilation rates than using one single point in the middle of the barn. For conventional ventilation situations, measurements in the ridge seem to be more representative of the barn average than in the middle axis. For more open situations, both VRCO2 and VRSF6 were increased, VRCO2=VRSF6 ratios being also more variable. Generally, both methods for the estimation of ventilation rates gave similar results, being 10-12% lower with the CO2 mass balance method compared to SF6 based measurements. The difference might be attributed to potential bias in both methods

Fijnstofemissie uit stallen: leghennen in volièrehuisvesting = Dust emission from animal houses: layer hens in aviary systems

In this study emissions of fine dust (PM10 and PM2.5) from houses for layer hens in aviary systems were determined. In addition, emissions of ammonia, greenhouse gases and odour were determine

Fijnstofemissie uit stallen: vleeskalkoenen

In this study emissions of fine dust (PM10 and PM2.5) from houses for turkeys were determined. In addition, emissions of ammonia, greenhouse gases and odour were determine

Fijnstofemissie uit stallen: vleeskuikens = Dust emission from animal houses: broilers

In this study emissions of fine dust (PM10 and PM2.5) from houses for broilers were determined. In addition, emissions of ammonia, greenhouse gases and odour were determine