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Showing 1 to 20 of 31 for “"nutrient load"”.
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Nutrient load analysis of Lago de Yojoa, Honduras
… a controversial subject. This thesis describes a nutrient load analysis performed to gain a better understanding of the water quality. Loads were calculated for point sources, non-point sources, and other sources. These loads were applied to a trophic model to determine the lake's trophic status. …
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Towards value from waste: Bioreactor selection for the reduction of nutrient load and production of Poly-y-glutamic acid
… of biomass retention on productivities and nutrient removal, under continuous and nonsterile conditions. The dilution rate was increased beyond the calculated critical dilution rate to confirm that biomass retention would allow operation at higher dilution rates, whilst still maintaining or …
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Nutrient Loadings Into Conesus Lake
A nutrient loading study utilizing field measurements has not been performed on Conesus Lake tributaries since the construction of a perimeter sewer. The database from this study includes many parameters and is quite large. This report details the results of measurements for stream nutrient …
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Aquaculture and pollution studies of an Australian fish: silver perch, Bidyanus bidyanus (Mitchell 1838) (Teraponidae)
… grown zooplankton, and quantifies solid and nutrient load from rearing of silver perch at different temperatures. The present study demonstrated that silver perch can grow significantly faster at a temperature close to it's optimum. It also show that sewage grown zooplankton was an …
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Impact of Substrate on Nutrient Removal in In-Ditch Bioreactors
Drainage ditches, or grassed waterways, collect nutrient-laden runoff from agricultural fields and transport it to nearby waterbodies. The high nitrogen and phosphorus content in this water leads to negative effects, such as eutrophication in the receiving waters. In-ditch bioreactors are a simple, …
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Identifying control points of excessive nitrate load in a pastoral catchment to support lake management
… different sources and transport mechanisms of nutrients in the lake catchment. Above the threshold, rainfall events led to the mobilisation of nitrogen from the overland flow pathway. In contrast, events below the threshold led to pronounced organic N release from subsurface runoff. The …
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Effective Modeling of Nutrient Losses and Nutrient Management Practices in an Agricultural and Urbanizing Watershed
… Manassas is experiencing eutrophication due to nutrient loads associated with agricultural activities and urban development in its drainage areas. Two watershed model applications using HSPF, and one receiving water quality model application using CE-QUAL-W2, were linked to simulate Lake …
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Nutrient Transport in the Lake Poinsett System
Concentrations and loads of nutrients transported through the Lake Poinsett system were monitored from April 1, 1970 to April 1, 1971. An annual 2.07x 10~ m3 surface discharge into Lake Poinsett transported 1.66 x 104 kg (PO4) phosphorus, 1.28 x 104 kg nitrate nitrogen, and 3.90 x 104 kg organic …
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A GIS-Based Watershed Impact Management Model
… in a significant reduction of sediment yield and nutrient load. However, no changes were evident in groundwater nitrate loading despite the addition of BMPS. The replacement of all non-urban areas with forest trees in the Yocona river basin, (scenario c) resulted in decreased runoff and sediment …
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The operation of a completely mixed activated sludge pilot plant employing alum addition for phosphorus removal
… of 67 percent. The reduced carbonaceous and nutrient load to the secondary biological process provided more complete phosphate removal and resulted in a reduction in hard-to-handle secondary sludge. In addition to consistently high removals of phosphorus, the pilot plant achieved 93 percent …
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Effects of Hydrological Connectivity on the Benthos of a Large River (Lower Mississippi River, USA)
… both the community changes and changes in the nutrient load and sediment makeup are temporary, only persisting until reconnection to the river channel occurs.
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Development of error correction techniques for nitrate-N load estimation models
Excess nutrient loads carried by streams and rivers are a great concern for environmental resource managers. In agricultural regions, excess loads are transported downstream to receiving water bodies, potentially causing algal blooms, which could lead to numerous ecological problems. To better …
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Evaluation of the microbial risks associated with duckweed cultivation on agro-industrial wastewaters
… have been shown to grow on a range of high nutrient load, agricultural and municipal waste streams. Duckweed species therefore offer sustainable, circular economy opportunities to couple wastewater valorisation with high protein content plant growth for potential animal feed applications. …
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The macrobenthos of the Mlalazi estuary: KwaZulu-Natal
… results indicated high concentrations of nutrients (nitrates, nitrites, orthophosphates, total phosphates) during the two sampling periods. Since there were no major industries and the prawn farm was not yet established during the 1989-1991 sampling period, high nutrient concentrations …
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New applications of STEPL watershed modeling of CAFO feedlot runoff and implications of surface water impacts
… the Spreadsheet Tool for Estimating Pollutants Load (STEPL). STEPL estimates the annual nutrient load of nitrogen and phosphorus, among other pollutants, by land use for a watershed. The Dry Creek Watershed Basin of Sioux County, Iowa, is delineated to capture runoff from large CAFO cattle …
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Origin and Transport of Nutrients in the Upper Big Sioux River, South Dakota
… studied to determine the origin and transport of nutrients in the Big Sioux River. The area was divided into three segments. Two of the segments, the Big Sioux River and Willow Creek Basins, were primarily agricultural drainage areas, and one segment was the city of Watertown. Sampling stations …
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Characterization of a Riparian Wetland Renwick Reservoir, Pembina County, ND
… problems include pollutants consisting of nutrients, sediment accumulation, turbid water and organic enrichment. Forty-one percent of the sediments deposited are in the newly-formed riparian wetland at the headwaters of the reservoir. This problem illustrates a need to characterize wetlands …
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Observations and implications of sediment-water interactions in the Niagara impoundment of southwest Virginia
… to redistribute the impoundment influent nutrient load, causing an enhance~ ment of the quantities released during the summer months, thus magnifying the impact on the waters of Smith Mountain Lake. The maintenance of aerobic benthic conditions could, at a tremendous energy cost, prevent …
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Assessing environmental equivalents for water quality trading
… dischargers who need to reduce their pollutant loads with land managers who could offset those loads with nonpoint source (NPS) reductions to economically achieve water quality improvements in a watershed. The potential issues impeding WQT are its inability to address trading risks and quantify …
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Evaluation of Rotational Bale Grazing as an Alternative Winter-Hay Feeding System for Beef Cows
… high fuel consumption, soil compaction, limited nutrient dispersion, heightened nutrient runoff risks, low forage yields, and nitrogen loss from manure. Rotational bale grazing (RBG) offers an innovative approach to winter hay feeding by strategically positioning hay bales on pasture prior to the …
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