presence and activity of denitrifiers. These factors have The effect of NO3--N diffusion on the order and rate of debeen studied bv several workers, for example, Bremner and nitrification reaction was studied in IS soils from various locations in Shaw (1958a, 1958b), Nommik (1956), Patrick (1960), the U.S. The soils were amended with 0.5% rice straw and incubated Broadbent and Clark (1965), and...

NO(3) concentration profiles were measured in the sediments of a meso-eutrophic lake with a newly developed microelectrode. The depth of penetration of NO(3) varied from only 1.3 mm in organic-rich profundal silty sediments to 5 mm in organic-poor littoral sandy sediments. The thickness of the zone of denitrification in the organic-rich sediments was <500 mum. Oxygen profiles measured simultane...

in recent years, there has been increased concern over pollution of groundwater by NOj-, yet little is known about microbial N transformations below the crop rooting zone. This study investigated the importance of microbial denitrification below the crop rooting zone of conventional and no-till corn plots. The soil was a well-drained Matapeake silt loam located in the Atlantic Coastal Plain. Pl...

Coastal environments are nitrogen (N) removal hot spots, which regulate the amount of land-derived N reaching open sea. However, mixing between freshwater and seawater creates gradients inorganic bioavailable organic matter, affect cycling. In this study, we compare nitrate reduction processes estuary offshore archipelago in coastal Baltic Sea. Denitrification rates were similar both environmen...

A denitrifying microbial consortium was enriched in an anoxically operated, methanol-fed sequencing batch reactor (SBR) fed with a mineral salts medium containing methanol as the sole carbon source and nitrate as the electron acceptor. The SBR was inoculated with sludge from a biological nutrient removal activated sludge plant exhibiting good denitrification. The SBR denitrification rate improv...

Low air pressure is a feature of high-altitude regions. Domestic wastewater from such regions typically has low carbon-to-nitrogen ratio (C/N ratio). These factors combine to make traditional biological nitrogen removal in inefficient and more energy-intensive. The partial denitrification-anaerobic ammonium oxidation (PD/A) process was reported remove ammonia municipal sewage, consuming fewer c...

Riparian wetlands have been shown to be effective "sinks" for nitrate N (NO3-), minimizing the downstream export of N to streams and coastal water bodies. However, the vast majority of riparian denitrification research has been in agricultural and forested watersheds, with relatively little work on riparian wetland function in urban watersheds. We investigated the variation and magnitude of den...