Science Inventory

Search Criteria: the term 'nitrogen OR phosphorus OR nutrient' in any part of any record.
  • Archive Status = Active

  •   (Sorted by Relevance Rank)
    Records 1 to 25 of 618

    Multi-objective optimization of nitrogen abatement plans for a coastal estuary of Cape Cod, Massachusetts (PRESENTATION)
    Eutrophication of coastal estuaries is an issue of growing concern, especially in areas with economies dependent on clean water for fish habitat and tourism. One such example is the Three Bays estuary of Cape Cod, Massachusetts, USA, which is impaired by excess nitrogen primarily...
    Natural infrastructure in large river basins: quantifying nutrient and hydrologic effects using “big” data and modeling (PRESENTATION)
    Integrating natural infrastructure into traditional stormwater and nonpoint source nutrient management is gaining popularity, particularly for challenges such drinking water protection and solutions to harmful algal blooms. This approach often involves a balance of maintaining in...
    delta15N of Chironomidae: an index of nitrogen sources and processing within watersheds as part of EPA’s National Aquatic Resource Surveys (PRESENTATION)
    Nitrogen (N) removal in watersheds is an important regulating ecosystem service that can help reduce N pollution in the nation’s waterways. However, measurement of processes that remove N such as denitrification can be quite expensive and time consuming. Measures that int...
    How the distribution of anthropogenic nitrogen has changed in Narragansett Bay (RI, USA) following major reductions in nutrient loads. (JOURNAL)
    Over the past decade, nitrogen (N) loads to Narragansett Bay have decreased by more than 50%. These reductions were, in large part, the direct result of multiple wastewater treatment facility upgrades to tertiary treatment, a process which employs N removal. Here, we document eco...
    Cyanobacterial nitrogen fixation and phosphorus scavenging during a HAB forming (2018 NALMS) (PRESENTATION)
    The efforts towards reduction of nutrient contamination of surface waters has greatly gained attention to mitigate increasing incidences of harmful cyanobacterial blooms (HABs), but little attention has been paid on the roles and importance of N2-fixation and phosphorus scavengin...
    Pilot-Scale Application of Shotblast Dust for Phosphorus Removal (JOURNAL)
    Phosphorus contamination is a global issue, and cost-effective remediation is sought for removing phosphorus from water. We applied a novel use of waste material called shotblast dust in a pilot-scale reactor to remove phosphorus from water. Results indicate that shotblast dust w...
    Nitrogen inputs drive nitrogen concentrations in U.S. streams and rivers during summer low flow conditions (JOURNAL)
    Ecological and human health impairments related to excess nitrogen (N) remain widespread in U.S. streams and rivers despite recent efforts to reduce N loading. Many studies have quantified the relationship between N inputs to watersheds and stream N export in terms of mass loads....
    Nitrogen uptake and allocation estimates for Spartina alterniflora and Distichlis spicata (JOURNAL)
    Salt marshes have the potential to intercept nitrogen that could otherwise impact coastal water quality. Salt marsh plants play a central role in nutrient interception by retaining N in above- and belowground tissues. We examine N uptake and allocation in two dominant salt marsh ...
    Challenges and Opportunities for Regional Nutrient Accounting in Life Cycle Assessment: Nutrient Fate & Transport Section (PRESENTATION)
    Estimating the environmental impacts associated with nutrients across the life cycle of a product, process, or service is an understudied and complex topic in life cycle assessment (LCA). Nutrients, such as nitrogen and phosphorus, cycle through the environment and often exist in...
    Alternative leach fields: nitrogen removal and response to saltwater intrusion (PRESENTATION)
    Communities are presently evaluating alternative methods of nitrogen removal from groundwater including wetland and watershed restorations, living shorelines, permeable reactive barriers, and rain gardens. As part of a larger project seeking to identify components of vulnerabilit...
    Characterization of organic nitrogen in aerosols at a forest site in the southern Appalachian Mountains (PRESENTATION)
    There is extensive evidence showing that boreal and temperate forests are affected by anthropogenic activities, both industrial and agricultural. Such activity results in unprecedented quantities of reactive nitrogen (N) being released into the atmosphere, subsequently altering g...
    Differential Sensitivity of Wetland-Derived Nitrogen Cycling Microorganisms to Copper Nanoparticles (JOURNAL)
    Metallic nanoparticles (NPs), the most abundant nanomaterials in consumer and industrial products, are the most probable class to enter and potentially affect the environment. In this study, wetland-derived microcosms were incubated with copper nanoparticles (Cu-NP) and ionic CuC...
    Nutrient Recovery from Municipal Wastewater for Sustainable Food Production Systems: An Alternative to Traditional Fertilizers - Cincinnati (PRESENTATION)
    This research evaluates fertilizer production from struvite (i.e., magnesium ammonium phosphate hexahydrate) generated from mixed wastewater. It compares the struvite production against traditional commercial fertilizers (e.g., diammonium phosphate). This analysis sheds light o...
    Mechanisms of Phosphorus Removal by Phosphorus Sorbing Materials (JOURNAL)
    Stormwater filters are a structural best management practice designed to reduce dissolved P losses from runoff. Various industrial byproducts are suitable for use as P sorbing materials (PSMs) for the treatment of drainage water; P sorption by PSMs varies with material physical a...
    Nutrient export from highly managed coastal watersheds: Lessons learned from long-term monitoring data (PRESENTATION)
    The health of estuarine ecosystems is often influenced by hydraulic and nutrient loading from upstream watersheds. This study analyzed a long-term (1979~2014) water quality and discharge data set collected from four adjacent coastal watersheds in south Florida where land and wat...
    Seasonal disconnect between hydrology and retention drives riverine nitrogen export Willamette River Basin, Oregon (PRESENTATION)
    Watershed nutrient balance studies traditionally focus on annual timescales to examine factors controlling landscape level nutrient inputs, processing, and export. In areas with strongly seasonal precipitation, leaching losses may be greater during wet seasons when hydrologic fo...
    Long-term trends in total inorganic nitrogen and sulfur deposition in the US from 1990 to 2010 (JOURNAL)
    Excess deposition (including both wet and dry deposition) of nitrogen and sulfur are detrimental to ecosystems. Recent studies have investigated the spatial patterns and temporal trends of nitrogen and sulfur wet deposition, but few studies have focused on dry deposition due to t...
    Integrated Science Assessment (ISA) for Oxides of Nitrogen, Oxides of Sulfur and Particulate Matter Ecological Criteria (Second External Review Draft, Jun 2018) (ASSESSMENT DOCUMENT)
    This draft Integrated Science Assessment (ISA) represents a concise synthesis and evaluation of the most policy-relevant science and will ultimately provide the scientific bases for EPA’s decision on retaining or revising the current secondary standards for NO<sub>2</sub>, SO<sub...
    Research Update: Nutrient Management and Control (PRESENTATION)
    Presentation to be given at the 2018 Nutrients Permitting Workshop, Columbus, OH. Presentation Outline: U.S. EPA, ORD Overview Research Plans &ndash; Safe and Sustainable Water Examples: Green Infrastructure Performance Monitoring LCA of Nutrient Control Technologies Nutrient Con...
    Nutrient recovery from municipal wastewater for sustainable food production systems: An alternative to traditional fertilizers - Newport, RI (PRESENTATION)
    Nitrogen (N) and phosphorus (P) nutrient discharge regulations are becoming more stringent with increased environmental impacts, especially in surface water bodies. Many wastewater treatment plants (WWTPs) have been equipped with the necessary nutrient removal technologies to mee...
    Contributions to the Nutrient Toolbox: Identifying Drivers, Nutrient Sources, and Attribution of Exceedances (PRESENTATION)
    Nutrients are a leading cause of impairments in the United States, and as a result tools are needed to identify drivers of nutrients and response variables (such as chlorophyll a), nutrient sources, and identify causes of exceedances of water quality thresholds. This presentatio...
    Long-term nutrient addition increases respiration and nitrous oxide emissions in a New England salt marsh (JOURNAL)
    Salt marshes may act either as greenhouse gas (GHG) sources or sinks depending on hydrological conditions, vegetation communities, and nutrient availability. In recent decades, eutrophication has emerged as a major driver of change in salt marsh ecosystems. An ongoing fertilizati...
    Quantifying Periphyton Community Responses to Nutrients in a Southeast Coastal Plain Watershed using a Molecular Approach (PRESENTATION)
    Nutrient (nitrogen and phosphorus) pollution is a water quality issue in the US, including within the southeastern states that comprise US EPA Region 4. Biotic condition of southeastern streams with respect to nutrients has been evaluated using biological indicators based on mac...
    Nutrient recovery from municipal wastewater for sustainable food production systems: An alternative to traditional fertilizers - Seattle (PRESENTATION)
    In order to have a deeper understanding of the nutrient management in terms of sustainability and holistic system consideration, the study compared different levels of nutrient removal and recovery technologies (Struvite precipitation using proprietary techniques and added N redu...
    Comparative Emergy Evaluation of Nutrient Removal and Nutrient Recovery Technologies and the Implications to Nutrient Management (PRESENTATION)
    The urbanization of the modern community creates large population centers that generate concentrated wastewater. A large expenditure on wastewater treatment has to be invested to make a modern city function without human and environmental health problems. Society relies on syste...