denitrification Articles
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Influence of plant communities on denitrification in a tidal freshwater marsh of the potomac river, United States
Received for publication May 9, 2008. We investigated whether marsh surface elevation, plant community composition (annuals vs. perennials), and organic matter quantity/quality were associated with differences in denitrification rates in an urban tidal freshwater marsh of the Potomac River, United States. We measured denitrification rates using both denitrification enzyme activity (DEA) with ...
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The Use of Water Quality and Process Models for Minimizing Wastewater Utility Greenhouse Gas Footprints
The Use of Water Quality and Process Models for Minimizing Wastewater Utility Greenhouse Gas Footprints provides an understanding of the processes that are responsible for the major contributions to GHG emissions from WWTP and sewer systems (e.g. heterotrophic denitrification, autotrophic nitrification, autotrophic denitrification, methanogenesis). This knowledge is translated into mathematical ...
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Soil formate regulates the fungal nitrous oxide emission pathway
Fungal activity is a major driver in the global nitrogen cycle, and mounting evidence suggests that fungal denitrification activity contributes significantly to soil emissions of the greenhouse gas nitrous oxide (N2O). The metabolic pathway and oxygen requirement for fungal denitrification are different from those for bacterial denitrification. We hypothesized that the soil N2O emission from ...
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Nitrous oxide emission from agricultural soils
Anthropogenic nitrogen loading, particularly fertiliser usage in agricultural soils is thought to be a potentially important source of nitrous oxide (N2O) emission, which can be controlled by properly managed fertiliser usage. In this research, laboratory scale experiments were conducted to evaluate N2O production and emission from agricultural soils under variable oxygen availability conditions. ...
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Nitrous oxide (N2O) emissions from biotrickling filters used for ammonia removal at livestock facilities
Recently several manufacturers of nitrifying biotrickling filters for ammonia (NH3) removal at animal houses have started to add a denitrification step to the installation, aiming to reduce the amount of discharge water by conversion of NH3 to nitrogen gas (N2). The aim of this research was to quantify the possible formation of nitrous oxide (N2O), which is a potent greenhouse gas, in three of ...
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Oxygen-induced dynamics of nitrous oxide in water and off-gas during the treatment of digester supernatant
Nitrous oxide (N2O) is a potent greenhouse gas and of special concern in wastewater treatment. It is formed in biological wastewater treatment under both aerobic and anaerobic conditions. A major reason for high N2O emissions is low oxygen concentration during nitrification. In this full-scale study of N2O emissions from a sequencing batch reactor for treating digester supernatant, the oxygen ...
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A greenhouse gas source of surprising significance: anthropogenic CO2 emissions from use of methanol in sewage treatment
The impact of methanol (CH3OH) as a source of anthropogenic carbon dioxide (CO2) in denitrification at wastewater treatment plants (WWTPs) has never been quantified. CH3OH is the most commonly purchased carbon source for sewage denitrification. Until recently, greenhouse gas (GHG) reporting protocols consistently ignored the liberation of anthropogenic CO2 attributable to CH3OH. This ...
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Pilot scale evaluation of SANI® process for sludge minimization and greenhouse gas reduction in saline sewage treatment
This study reports on a pilot trial of the SANI® process (Sulfate reduction, Autotrophic denitrification and Nitrification Integrated process) in Hong Kong. A pilot-scale SANI plant treating saline sewage at 10 m3/day was scaled-up from a lab-scale system treating synthetic saline sewage. The plant consisted of a sulfate reduction up-flow sludge bed (SRUSB), an anoxic bioreactor (BAR1) for ...
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Carbon footprints of Scandinavian wastewater treatment plants
This study estimates the carbon footprints of 16 municipal wastewater treatment plants (WWTPs), all situated in Scandinavian countries, by using a simple model. The carbon footprint calculations were based on operational data, literature emission factors (efs) and measurements of greenhouse gas emissions at some of the studied WWTPs. No carbon neutral WWTPs were found. The carbon footprints ...
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OxyMem MABR-Severn Trent - Case Study
Project Details Challenges The consumption of energy is one of the highest operational costs for Severn Trent and the main cause of greenhouse gas emissions for the company. Solution MABR system can potentially reduce up to 75% energy consumption compared to conventional activated sludge using bubble-based aeration. Energy reduction They were seeking a solution that reduced their energy ...
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Potential of nitrous oxide recovery from an aerobic/oxic/ anoxic SBR process
Nitrous Oxide (N2O) is a kind of greenhouse gas which has a great influence on the global warming. And it is also a powerful oxidant in combustion reactions, which can improve the output power of biogas power generation from 5.7% to 7.3%. It is generally known that the amount of N2O emitted from wastewater treatment is 3% of the total global emissions of N2O. So it is of great significance for ...
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Top Applications of Shortcut Nitrogen Removal
Skipping a step streamlines treatment of a range of high-ammonia wastewater sidestreams Over the years there has been an ongoing quest to make wastewater nutrient removal more efficient than traditional activated sludge treatment, which is effective but uses a great deal of energy, carbon, and oxygen. There has been progress, starting with full nitrification-denitrification and simultaneous ...
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Interactive effects of climate change with nutrients, mercury, and freshwater acidification on key taxa in the North Atlantic Landscape Conservation Cooperative region
The North Atlantic Landscape Conservation Cooperative LCC (NA LCC) is a public‐private partnership that provides information to support conservation decisions that may be affected by global climate change (GCC) and other threats. The NA LCC region extends from southeast Virginia to the Canadian Maritime Provinces. Within this region, the U.S. National Climate Assessment documented increases in ...
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Methodology for the assessment of the greenhouse gas impact of wastewater sludge treatment
Nitrous oxide (N2O) and methane (CH4) emissions from the wastewater sector represent the second largest source of greenhouse gas (GHG) emissions of the waste sector. A protocol has been developed to measure GHG from sewage sludge treatment. GHG measurements were performed on two industrial sewage sludge composting plants. Measurement campaigns showed GHG emissions range between 0.18 to 3.40 ...
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Saline sewage treatment and source separation of urine for more sustainable urban water management
While energy consumption and its associated carbon emission should be minimized in wastewater treatment, it has a much lower priority than human and environmental health, which are both closely related to efficient water quality management. So conservation of surface water quality and quantity are more important for sustainable development than green house gas (GHG) emissions per se. In this ...
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Reductions in greenhouse gas (GHG) generation and energy consumption in wastewater treatment plants
Greenhouse gas (GHG) emission and energy consumption by on-site and off-site sources were estimated in two different wastewater treatment plants that used physical–chemical or biological processes for the removal of contaminants, and an anaerobic digester for sludge treatment. Physical–chemical treatment processes were used in the treatment plant of a locomotive repair factory ...
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Treatment of Biogas Produced in Anaerobic Reactors for Domestic Wastewater: Odor Control and Energy/Resource Recovery
Anaerobic municipal wastewater treatment in developing countries has important potential applications considering their huge lack of sanitation infrastructure and their advantageous climatic conditions. At present, among the obstacles that this technology encounters, odor control and biogas utilization or disposal should be properly addressed. In fact, in most of small and medium size anaerobic ...
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Perspectives on greenhouse gas emission estimates based on Australian wastewater treatment plant operating data
Primary operating data were collected from forty-six wastewater treatment plants (WWTPs) located across three states within Australia. The size range of plants was indicatively from 500 to 900,000 person equivalents. Direct and indirect greenhouse gas emissions were calculated using a mass balance approach and default emission factors, based on Australia's National Greenhouse Energy ...
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Algae as a Gamechanger for Ecosystem Restoration
Moderator: Dr. Kuldip Kumar, Principal Environmental Scientist, MWRD Chicago The speakers for this session of the Algae Biomass Summit on Algae Ecosystem Restoration had over 100 years of experience combined. We had the pleasure of hearing them speak on how algae can help restore the ecosystem. This topic includes removal of harmful bloom, reducing fertilizer use through soil amendments, and ...
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The Water Footprint of Beef
While production of most meat is much more water-intensive than growing vegetables, until beef production goes down, there are ways the industry can increase water efficiency According to a 2019 report by the Intergovernmental Panel on Climate Change (IPCC), our food system accounts for approximately 33% of greenhouse gas emissions, and humanity’s ever-expanding agricultural land use is ...
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