Much animal manure is being applied to small land areas close to animal confinements, resulting in environmental degradation. This paper reports a study on the emissions of ammonia (NH3), methane (CH4), and nitrous oxide (N2O) from a pasture during a 90-d period after pig slurry application (60 m3 ha-1) to the soil surface. The pig slurry contained 6.1 kg total N m-3, 4.2 kg of total ammoniacal...

A pilot-scale multilayer rapid infiltration system (MRIS) for domestic wastewater treatment was established and efficient removal of ammonia and chemical oxygen demand (COD) was achieved in this study. The microbial community composition and abundance of ammonia oxidizers were investigated. Efficient biofilms of ammonia oxidizers in the stationary phase (packing material) was formed successfull...

INTRODUCTION Ammonia vapor is one of the nitrification by-products produced by a tubular bioreactor being developed at the NASA Johnson Space Center for wastewater treatment during long duration space missions (Figure 1). In order to quantify this NH3 vapor production, a portable diode laser-based gas sensor for NH3 detection using overtone infrared absorption spectroscopy was developed, and a ...

tion for contact effects and of the small difference between NH3 and air mobilities. It points, however, in the same direction as the NH3-air work; namely, to a preferential change in concentration of NH3 molecules in the neighborhood of both ions. This effect is noticeable even at high concentrations of NH3. One thus sees in the negative ion the effect of the dielectric constant of NH3 on the ...

Cropland soil is an important source of atmospheric nitric oxide (NO) and ammonia (NH3). Chinese croplands are characterized by intensive management, but limited information is available with regard to NO emissions from croplands in China and NH3 emissions in south China. In this study, a mesocosm experiment was conducted to measure NO and NH3 emissions from a typical vegetable-land soil in the...

[1] Significant uncertainty exists in the magnitude and variability of ammonia (NH3) emissions. NH3 emissions are needed as input for air quality modeling of aerosols and deposition of nitrogen compounds. Approximately 85% of NH3 emissions are estimated to come from agricultural nonpoint sources, which are suspected to have a strong seasonal pattern. Because no seasonal information is available...

Mineral extraction can significantly affect the groundwater flow and hydrochemical environment. However, for hilly areas, significant ground elevation changes complex geological conditions make it difficult to accurately analyze predict impact of mineral mining. This study takes Nuodong rare earth mining area as an example. Based on field investigations experiments, GOCAD software (version 2022...

Ammonia (NH3) emission is a major concern for the poultry industry. We hypothesized that fi ber in corn distiller’s dried grains with solubles (DDGS), wheat middlings (WM), and soybean hulls (SH) would lower NH3 emission by increasing bacterial growth in the large intestine, which would 1) repartition N excretion from uric acid to bacterial protein and 2) produce volatile fatty acids that could...

Urbanization has been found to impact stormwater runoff quantity and quality. A study catchment with mixed land use, residential and industrial were investigated and the water quality discharged from the catchment were sampled and tested for four basic water quality parameters; BOD5, NH3-N, NO3-N and P. One dry weather flow and several stormwater runoff were sampled. Results were compared to th...

The effects of urea and rumen-degradable protein (RDP) on microbial growth, digestibility, and fermentation were examined using dual-flow continuous culture. The experimental design was a 4 x 4 Latin square with a 2 x 2 factorial arrangement of treatments. Factors were urea infusion (0.4 g/L of artificial saliva) and RDP concentration, and the treatments were as follows: 1) low RDP (8% of dieta...