Browsing by Subject "Emission"

Now showing 1 - 6 of 6
  • Thumbnail Image
    Publication
    Emission von Ammoniak (NH₃) und Lachgas (N₂O) von landwirtschaftlich genutzten Böden in Abhängigkeit von produktionstechnischen Maßnahmen
    (2003) Leick, Barbara Cornelia Elisabeth; Engels, Christof
    The goal of this research was to quantify event-based NH₃ and N₂O emissions in various farming systems and to propose emission-avoidance strategies. Emission measurements were made on pasture land (Allgaeu, Hohenheim) and on cultivated fields (Hohenheim, Biberach). These measurements were made after applying organic and mineral fertilizers, after incorporating crop residues, and after freeze / thaw cycles; furthermore, experiments were conducted using container plants of different species (leguminous, and non-leguminous) and different fertilizers. NH3 emissions data was gathered under field conditions using the wind tunnel method and the IHF method (Integrated Horizontal Flux). In the container experiments, data was gathered by taking photo-acoustic measurements. N₂O emissions data was compiled using closed chambers (Hohenheim measuring chambers) and using an open-chamber system in which an exchange occurred between the air in the chambers and the ambient air. N₂O levels were determined using a gas chromatograph or by photo-acoustic measurements. The NH₃ emissions after applying liquid manure to pasture land varied between 11 and 40% of the total nitrogen applied. Emission levels of less than 20% occurred when it rained shortly after spreading liquid manure causing it to be washed into the soil. The application technique (splash plate, surface banding and liquid manure injection) had no apparent influence on NH₃ emissions under these conditions. The N₂O emissions after liquid manure fertilization on pasture land in Hohenheim were 0.16% of the total NH4+-N. In comparison, the emissions in the Allgäu were between 1.7 and 2.3% of the total NH4+-N applied. Liquid manure injection led to higher emissions as did application using a splash plate. In the Allgäu, the N₂O emissions after mineral-nitrogen fertilization were markedly lower (0.3 to 0.8% of applied N) than after liquid manure application. In Hohenheim, the nitrogen form had no distinct influence on the emissions (<0.16% of applied N). Definitive differences between the two locations were observed during the experiments. These differences were based on N₂O losses due to the respective soil and weather conditions (precipitation, temperature). The higher emissions after applying liquid manure compared to those after applying mineral nitrogen fertilizer are explainable in that aside from the nitrogen compounds found in liquid manure, carbon compounds which promote the microbial formation of N₂O were also entering the soil. The NH3 emissions after liquid manure fertilization on cultivated fields using a splash plate varied between 25 and 35% of the applied NH4+-N. By using a slurry cultivator which combines application with immediate incorporation, the NH3 emissions can be clearly reduced to 6% of the applied NH4+-N. Application with a drag hose, in comparison to using a splash plate, did not always result in an emission reduction; however, in taller plants, a readable emission reduction was measured. The N₂O emissions after liquid manure application on cultivated fields varied between 0.1 and 2.2% of the applied NH4+-N whereby the emissions after guided application with the drag hose were always higher than after using a splash plate. Mineral fertilizer had lower N2O emissions (<0.13% of applied N), especially when ammonium fertilizer was brought out in combination with a nitrification inhibitor. The incorporation of green manure crops notedly increased N₂O emissions. N₂O emission after the incorporation of legumes was especially high. In the container experiments, a diurnal rhythm of the N₂O and NH₃ flows in growing rape and vetch was observed. This indicated a stomatal flow of these gaseous nitrogen forms. N₂O emissions also occurred outside of the vegetation period at temperatures between 0 and 5°C, with the N₂O emissions from the nitrogen fertilized parcels being greater than the emissions from the unfertilized parcels. In container experiments, the N₂O emissions after freeze / thaw cycles were greater from white clover than from perennial rye grass. In fallow soil columns, the N₂O emissions after freeze / thaw cycles were especially high if the content of nitrate and water-soluble organic carbon in the soil was large. The results of this research show that the emission of nitrogen-containing compounds after organic and inorganic fertilization can be reduced through application methods (immediate incorporation), appropriate fertilization technology (addition of nitrification inhibitors), but also through fertilizer application under favourable weather conditions to include seasonal and volume adjustment of the fertilizer based on the growth requirements of the plants. Because high N₂O emissions can also occur at low temperatures, cultivation practices that influence the availability of mineral nitrogen and easily degradable organic substances in the soil during cold weather have a large impact on the N₂O emissions from agricultural land.
  • Thumbnail Image
    Publication
    Grundlagenuntersuchungen zur Wirkung neuartiger Ureaseinhibitoren in der Nutztierhaltung
    (2008) Reinhardt-Hanisch, Annett; Hartung, Eberhard
    Due to the agreements held by Germany in international and national programmes to reduce climate and environmental deterioration particularly in relation to ammonia emissions from livestock housing, additional measures have to be taken in order to ensure that international and national objectives will be achieved. Within the framework of a BMBF-funded interdisciplinary research project, new types of urease inhibitors had been tested for application in animal housing. The present work shows the necessary basic studies, which formed the basis for the investigations under conditions similar stall conditions and in practice stall in the second part of the project (LEINKER, 2007). The main objective of the present work was to investigate the effect of different urease inhibitors on urea hydrolysis, and thus to quantify the ammonia release of urea applied on cattle slurry under standardized, reproducible and controlled laboratory conditions and to investigate possible influencing factors (Pre-screening). Subsequent objectives result in the following: development of an appropriate measuring system and implementation of a standardized test, study of various urease inhibitors at different substrate temperatures and inhibitor concentrations, selection of the urease inhibitor which has the best reduction effect, and quantification of other factors influencing the effect of the selected urease inhibitor. In order to assess the inhibitor effect, the protonated ammonium and the available ammonia in slurry should be detected by means of conducting slurry analysis. In addition, the first indications of a long-term effect of the selected urease inhibitor, its impact on biogas accumulation, and its effect on liquid swine manure should be derived. In order to carry out the investigations, a water-tank measuring system had been configured and validated. The 28 measuring tanks of the measurement system, where each tank was filled by 2 l of slurry, worked according to the principle of dynamic chamber and were kept at constant temperature using a water bath. A gas analysis based on NDIR spectroscopy had been used in order to sustain continuous measurement of ammonia concentrations in the measuring device. The standardized test, applied in the main experiments, had been developed in the preliminary experiments. Among the five pre screened urease inhibitors (four new active agents + reference NBTPT active ingredient), the urease inhibitor D is selected for further investigations in the project, as this is the best inhibitor having significant reduction effect, which was in general dependent on the substrate temperature and the inhibitor concentration in terms of ammonia release. For an effective reduction of ammonia release, it seems useful to deploy more often smaller quantities of the inhibitor. The urease inhibitor D showed a significant reduction effect regardless of the origin and the layer thickness of the respective liquid manure. In comparison with the urease inhibitor D treated variants, more urea is significantly converted to ammonia and ammonium-nitrogen at a layer thickness of 4 mm than at a layer thickness of 90 mm. Apart from the ammonia release, the resulting nitrogen balance of all the tests showed no indication of further significant gaseous nitrogen losses, e.g. as nitrous oxide. In the experiments, no significant influence of urease inhibitor D had been detected on the (urea independent) basic release of ammonia from the respective liquid manure resulting from the degradation of organic substances. In practice, this means that the use of urease inhibitors is only reasonable in the presence of urea. The preliminary related investigations showed that the duration effect of the urease inhibitor D is dependent on temperature; no adverse effects caused by the inhibitor D of treated slurry on the biogas accumulation. Similar relations, as in cattle slurry, had been recognized and showed for the urease inhibitor D in pig slurry. As part of the investigations, a urease inhibitor is selected for cattle and pig slurry urea hydrolysis, and thus the ammonia release is significantly reduced. The basic investigations afforded an important contribution to the expansion of knowledge in this area, and lead on the other hand to develop new techniques in order to reduce the ammonia emissions from livestock housing.
  • Thumbnail Image
    Publication
    Intensive pig production and manure management in Beijing, North China Plain
    (2014) Mendoza Huaitalla, Roxana; Gallmann, Eva
    China, at the forefront of the livestock revolution, has experienced a more industrialized change, with an increment of the large livestock farms and of the decoupling between the livestock and arable land. Meat production in China is dominated by pork, which comprises approximately 50% of worldwide pig production. The description of the pig husbandry and manure management systems in the large animal operations of the NCP is not widely available. In order to describe the status quo of the pig production and manurial management systems in the NCP, a large-size pig farm with a dimension of 10 ha and an annual stock of 12,000 breeding swine and 20,000 market pigs or porkers was selected. An intensive sampling plan as far as feasible of pig manure, wastewater, drinking water, and feed, the main pig farm inputs and outputs, was started in 2009. The manurial system identified in the farm was denominated as “gan qing fen” or “cleaning the manure dryly”. In this system, the pig manure (faeces with some remains of urine) was collected manually by scraping the mainly non-slatted floors of the pigsties twice a day, and the floors were then flushed with water. The results showed that the pig manure was characterized by high nutrient and heavy metal contents that might be due to the solid fraction separation from the liquid fraction under the gan qing fen manurial management system. The piggery wastewater was characterized by very low concentrations of nutrients and heavy metals as a result of their dilution with flushing water, mainly used for cleaning the pigsties. Manure and wastewater samples from weaning pigs contained the highest concentrations of nutrients and heavy metals; that could be due to the high supplementation rates of these minerals in the weaner diets. In general, it seems that the manual daily collection of pig manure in the gan qing fen system is an efficient practice in order to maintain nutrient contents in pig manure, but the use of flushing water should be reduced as it can lead to further environmental pollution. China has issued a range of environmental standards in recent years. The Chinese national standards are adoptions of international standards and are consistent across all of China. Chinese and German recommendations were compiled in order to compare them with the results obtained in this study. Based on the comparisons, it is stated that pig drinking water sourced from groundwater wells was of optimum quality as it is used for both pigs and humans. Trace minerals in pig feeds, such as lead (Pb), chromium (Cr) and cadmium (Cd), were found to be within the range of values given by the Chinese and German feeding recommendations. However, high mineral concentrations of zinc (Zn), manganese (Mn), copper (Cu), and arsenic (As), mainly found in the weaning feed samples, surpassed the given thresholds by almost ten times. Pig manure was compared with the German and Chinese standard for biowaste due to the nonexistence of a specific standard for animal manure in both countries. It was observed that maximum Cd, Cu and Zn concentration values surpassed the thresholds established in those recommendations. Similarly, trace mineral concentrations in the piggery wastewater were compared with the Chinese standard for irrigation water, however, it was not compared with any German standard due to the different nature of the effluent generated from the Chinese gan qing fen manurial management system, and it was found that Pb, Cd, Cr, Cu, and Zn did not comply with the irrigation water quotes. Furthermore, there is a need to re-evaluate the current Chinese standards and to strengthen the recommendations focused on the disposal, reuse and recycling of manure and wastewater of livestock origin in general. In order to evaluate the air pollutants produced in the pig farm, i.e. gas concentrations of carbon dioxide (CO2) and ammonia (NH3), and particulate matter, were measured making use of four different measurement devices. High dust concentrations were identified in the pig barns, especially during the feeding and manure cleaning events inside the farrowing and weaning barns with slatted floors. The highest NH3 concentration was recorded in the weaning barn during the summer season, while the highest CO2 concentration was reported in the gestation barn during the winter season. To conclude, using the example of an intensive pig farm near Beijing, it was identified that the main issues were the decoupling between the cropland and the pig farm, the existence of nutrient surpluses in the pig manure originating from the uncontrolled nutrient supply into the pig feeds, the manure mismanagement (open manure storage), a lack of infrastructure (broken curtains, windows, inoperative fans), aerial pollutants (high indoor concentrations of CO2, NH3 and PM1-10), extensive hand labour, and obsolete know-how with respect to resource conservation, among the most significant.
  • Thumbnail Image
    Publication
    Qualitativer Vergleich von Modellen zur Bewertung von Klimaschutzmaßnahmen in Europa unter besonderer Berücksichtigung der Landwirtschaft
    (2006) Vabitsch, Anna Maria; Zeddies, Jürgen
    Agriculture in Europe is responsible for a considerable fraction of greenhouse gas emissions. Methane, nitrous oxide and carbon dioxide emissions from agricultural sources account for about 10% of the total European greenhouse gas emissions. The contribution that agriculture can and should make to the achievement of the agreed European goals for emission reductions has to be assessed. The aim of this study is to analyse the possibilities and conditions for greenhouse gas mitigation in the agricultural sector in comparison to other economic sectors. It addresses the question of how meaningful and efficient it is to reduce greenhouse gas emissions from farming. A review of the literature showed that various measures for emissions reductions are available for agriculture as well as for the other sectors. In order to assess the efficiency of these mitigation measures, a quantification of abatement costs is necessary. For this purpose, economic-ecological models were chosen which were developed mostly for political advice and analysis. A detailed analysis and assessment of the chosen models was carried out in order to evaluate the model results. The comparative assessment of model results arrives at the conclusion that there is presently no model available that satisfies all the requirements demanded of an environmental indicator for climate policy. For this comparison of models, a selection of representative models was described and analysed in detail. The following models were chosen for the detailed analysis and assessment: POLES, MERGE, EPPA-EU, PRIMES / GENESIS, RAINS / GAINS, CAPRI, AROPA GHG and RAUMIS. They were differentiated between highly aggregated models which represent the global economy with its impacts on the climate system and, in contrast, disaggregated models which focus on a single sector and/or region. Two categories of model structures were observed: general and partial equilibrium models based on the neo-classical economic theory of perfect markets and, on the other hand, optimisation models which were solved by the maximisation of (regionally weighted) profit and benefit. An important feature which distinguishes between the models is the sectoral and material resolution. Aggregated energy models are commonly used, most of which not only reproduce the energy sector, but also the other sectors. However, they only account for energy-related CO2 emissions. These models provide important information on the most relevant emitting sector (energy) and the most important greenhouse gas (CO2), but they neglect the presence of the other Kyoto-gases and the possibilities of an integrated approach for emission reductions. The results of assessments of mitigation potential in the agricultural sector using energy models are incomplete because the relevance of non-CO2 emissions and their possible contribution to overall emission reductions are disregarded. As a second focus models of the agricultural sector were analysed and assessed. These models describe the agricultural production process with a high degree of resolution and determine specific mitigation costs of single measures and options. Additionally, some of these models assess the interactions and effects of simultaneously reducing emissions of different greenhouse gases. However, the problem still exists that results from models of different sectors are not comparable with one another. The main reasons for this are the varying model assumptions and the specific conditions. A method to resolve this dilemma is provided by the models that integrate top-down and bottom-up elements in one model framework. This means that several sectors and countries are simultaneously modelled (top-down) but detailed information on specific gases and mitigation options is integrated as well (bottom-up). Using this procedure, the comparison of different sectors is possible and sector-specific accuracy in the definition of abatement costs, for instance, is also achieved. This procedure is most advanced in the case of integrated assessment models. This approach aims to account for as many aspects as possible of one environmental problem as well as for all its interactions and impacts on other environmental goals. At present, these very complex model systems are most readily applicable to find solutions for the optimal spatial, temporal and material allocation of mitigation measures and investment. The significance of these model results is, of course, also dependent on the available database and on the assumptions made. These models come to the conclusion, among other things, that the integration of agricultural greenhouse gas emissions into a holistic mitigation approach may provide a significant reduction in mitigation costs. Despite the high level of uncertainties regarding the model results, it can be concluded that the agricultural sector should definitely contribute to achieving the agreed emission reductions.
  • Thumbnail Image
    Publication
    Untersuchungen zum Emissionsgeschehen von Ammoniak und Methan in der Mastschweinehaltung
    (2017) Gronow-Schubert, Stephanie; Gallmann, Eva
    The growing of feed crops, the production of farm livestock and the processing of livestock products, along with the associated use of farmland for this entire production chain, all engender greenhouse gases on a worldwide scale. In this respect, ammonia and methane emissions are directly associated with livestock farming including the feeding of pigs for slaughter. The main aim of the work presented in this thesis was investigation of emissions produced in this way, and into selected strategies applied for reducing ammonia and methane release, particularly in management of liquid manure inside a fattening unit. In this context, the paper focusses on the three approaches – measuring, analysing and modelling - which are accordingly established as the following part-targets: • Applying emission reduction strategies as part of liquid manure management in a conventional fattening unit and comparing the resultant emissions with those from a reference system where no emission reduction actions had been taken. The selected emission reduction strategies should be practicable and sustainably applicable in existing livestock housing systems. • Analysing the main factors of influence on emissions throughout the fattening period during different seasons of the year, with special consideration of time series effects and regressions. • Examining the possibilities of substance flow modelling, application to own measurement data rather or for assessing the potential of emission reduction methods as well as evaluation of the selected approach for substance flow modelling. In-barn liquid manure management with fattening pigs markedly influences ammonia and methane emissions whereby the concrete reduction potentials are not yet sufficiently clarified. Within this study, a first work package compares, through a case control approach, the liquid manure management strategies - weekly emptying of the liquid manure channel as well as covering of the underfloor stored liquid manure surface as well as the addition of Effective Microorganisms to the liquid manure – with the strategies tested for emission reduction potential and compared over a feeding cycle in each case with the stored manure method as reference. The pig housing used in the trial was divided into two compartments (experimental and reference compartment) each holding 50 animals. In quasi-continuous measurement, incoming air, compartment and exhaust air ammonia and methane concentrations, temperatures of incoming air, compartment and exhaust air, and the temperature and pH of the liquid manure, were all recorded. Additionally, liquid manure samples were analysed in 14-day rhythm and the level of liquid manure measured as well as the degree of dirtiness of pen floors. Also recorded were pig weights and performance or feeding data. No further differences in terms of feeding, ventilation or management existed between trial and reference compartments. The applied reduction strategies were able to partially reduce ammonia and methane emissions (weekly emptying of liquid manure channel: methane emission rates reduced by 39 % based on emission rate in grams per day and livestock unit; liquid manure cover: 13.8 % ammonia emission rates reduction in grams per day and livestock unit), had in part no effect, or even a negative influence on the emissions (weekly emptying of the liquid manure channel: no effect on ammonia emissions; liquid manure cover: 119.9 % rise in methane emission rates in terms of grams per day and livestock unit). The selected interval of one week between emptying the liquid manure channel was not sufficient as a reduction strategy. With covering of the liquid manure surface underfloor, it is important to consider that the almost airtight sealing of the liquid manure surface delivered favourable conditions for methanogenesis. The influence of the addition of Effective Microorganisms to the liquid manure on the emissions of ammonia and methane was marginal. The emissions of ammonia increased of 8.3 % and the emissions of methane of 5.9 %. The evaluations (time series and regression analyses) of the data from the reference compartments from a total of four feeding cycles (two summer and two winter cycles) comprised the second work package. The time series analysis enabled insight into the relationships between the ammonia and methane emissions in terms of time, and insights into the influential factors affecting release and transport of the gases. For example, the time-related influences of high temperatures on the system “fattening unit” and on the release of emissions, could be graphically shown. The time series analysis gave indications as to how dynamic, or how stable, climatic conditions can be in pig housing. The regression analyses clearly showed that the emission process, with ammonia as well as with methane, is influenced particularly through the amount of liquid manure involved, the temperature and the air volume flow. In the same way, the distance between the liquid manure surface and the slatted flooring (‘headspace’) was found to have direct influence on the release of ammonia and methane from the liquid manure. A larger ‘headspace‘ correlated with reduced emissions and vice versa. Following recording and statistical evaluation of the emission data, the contribution that can be made through substance flow modelling of ammonia emissions towards increasing knowledge on the emission process and on methods for its reduction within pig housing was examined as a third work package. This involved the transfer of selected recorded data into the substance flow model. Serving as basis was the model from CORTUS et al. (2010a) adapted in three steps to take account of the conditions in the pig housing being used. The constructional outline of the trial livestock housing served as system limit. Berkeley Madonna 8.3.18 software was used for numerical integration of the differential equation system. Own data was applied for calibration and validation, in each case taken from the reference compartment of two different feeding cycles. In principle, the adapted model was capable of modelling ammonia concentrations and emissions. In addition, the influence of the liquid manure temperature and pH value of the liquid manure could be depicted. However, the model generally reacted sensitively to temperature and pH values. Because of this, the model underestimated and overestimated recorded values, in part substantially. An important influence on the model accuracy appeared to be related to the submodel considering urine puddles. For the purposes of own modelling, this submodel was cut out of the main model during its adaptation according to the recorded data. Compared to recordings, modelling of gas concentrations and emissions offers the advantage of cost-efficient and time-saving estimations of emission potential for different housing systems, e.g. for feeding pig production. Calibration and validation, as well as adaptation to suit the type of application requires, however, particular care and expertise. Through the various methods for measurement, analysis and modelling that were applied, the work reported here contributes to better understanding of the emission process and the reduction of emissions, particularly in the case of liquid manure management in feeding pig production.
  • Thumbnail Image
    Publication
    Vergleich von zwei Haltungssystemen für Mastschweine mit unterschiedlichen Lüftungsprinzipien - Stallklima und Emissionen
    (2003) Gallmann, Eva; Jungbluth, Thomas
    The main goal of this work was to carry out a system comparison of two different housing systems for fattening pigs with regard to indoor climate and the gas emission and to derive a corresponding data basis in the frame of long-term measurements with a high temporal resolution. The housing systems to be compared were a conventional stable with fully slatted floor and a conversion solution designed as a kennel housing system with natural ventilation. The system comparison of the two different housing systems for fattening pigs was carried out in two spatially separated compartments of the experimental pig facility for fattening pigs in Hohenheim. During the investigations the conventional practical housing system served as reference system and featured fully slatted floor, six small groups with nine pigs each, forced ventilation with underfloor extraction. As comparison system a conversion solution for forced ventilated pig houses was developed and realized. It was designed as a kennel housing system with separate climatic areas and with natural ventilation. The kennel housing system consisted of two larger animal groups with 24 pigs each, it showed slatted floor at the activity area and a level concrete covered lying area for resting. The natural ventilation system in the kennel housing system was designed as a gravity shaft system with an additional, solar-powered fan in one chimney for optional supporting ventilation. No differences between the housing systems existed concerning feeding (sensor liquid feeding, four-phases nutrient adjusted feeding), occupation, demanuring, stocking management (all in - all out) and the animals origin. The relevant measuring parameters for evaluating the indoor climate and gas emissions as temperature, humidity, ventilation rate, gas concentrations (NH3, CO2, CH4), animal activity, wind speed and wind direction were registered with a high temporal resolution. In addition at regular intervals also manure samples were analysed, dust concentration measurements were carried out as well as data concerning the floor soiling, the animal weight, weight gain and feed conversion ratio were documented. Between the housing systems "fully slatted floor, forced ventilation (FSF)" and "kennel housing, natural ventilation (KN)" a clear difference existed concerning the indoor climate mainly due to the different ventilation systems. At both housing systems the indoor concentrations of NH3, CO2 and CH4 were acceptable, but at the same time lower at system KN than at system FSF, so it can be concluded, that the air exchange in the animals area was sufficient. Inside the kennels of the system KN the air quality was strongly dependent on the soiling with animals´ droppings, especially during warm days, when the pigs tend to switch the functional areas. Depending on the temperature and given the lower resting area requirements of the younger animals, some of the covered resting areas were heavily soiled. The indoor dust concentrations (PM 10; PM 2,5; PM 1,0) were during all measurements about two third lower at system KN than at system FSF. For all data sets a negative correlation between dust concentration and air flow rate per livestock unit LU (500 kg live weight) was determined. At both housing systems the dust concentrations during feeding were due to the increased animal activity two to six times higher than between the feeding times. Comparing the mean emission rates of NH3, CO2 und CH4, significant differences between the housing systems with entirely lower emission rates of the natural ventilated system KN were found during all four fattening periods under investigation. Due to manifold dynamic interrelations between the different influencing factors on the emissions at such complex systems as animal houses, also significant differences between the fattening periods within one housing systems were found. Therefore a seasonal effect on the emissions could not be proven on basis of the gained data sets. Considering both the daily mean values and typical daily courses of the gas emissions, different relationships between air flow rate, exhaust air concentration and emission were found between the two housing systems. At the forced ventilated housing system FSF as a result of increasing air flow rates the exhaust air concentrations were lowered (diluting effect) but the emissions raised up. At the natural ventilated housing system KN the relations were not always clear or opposite effects were observed. Increasing air flow rates resulted partly in just as increased exhaust air concentrations but following lower emissions. At both housing systems short emissions peaks of NH3 and CO2 can be explained by an increased animal activity during feeding.