Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 32 for “"dissolved organic nitrogen"”.
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Dissolved organic nitrogen in the river test and estuary
… rivers and estuaries have generally focused on dissolved inorganic nitrogen (DIN), although this accounts for only a part of the total nitrogen (TN) in these systems. Dissolved organic nitrogen (DON) has not yet been fully considered as a factor contributing to the nitrogen pool in aquatic …
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Total and dissolved organic nitrogen analysis in an urban watershed
Thesis (M.Eng.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 2003.
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Role of Dissolved Organic Nitrogen in the Soil Nitrogen Cycle of Forest Ecosystems
In the last years, dissolved organic N (DON) has been shown to be a crucial part of the soil N cycle in forest ecosystems. Despite this, information on its dynamics, sources and fate is still lacking. Especially data from (sub)tropical forest ecosystems are scarce. Therefore, this study …
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Assessment and characterization of dissolved organic nitrogen removal in simulated soil aquifer treatment systems
… contaminants.Therefore, this research focused on dissolved organic nitrogen (DON) that has yet to be adequately investigated. Effluent DON could be problematic in the receiving waters as a nitrogen source causing eutrophication. It can also act as a precursor for nitrogenous disinfection …
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Treatability of Dissolved Organic Nitrogen in Truckee Meadows Water Reclamation Facility Using Coagulation or Ozone Treatment
… load allocation (WLA) of 500 lbs/day for total nitrogen and a significant portion of the total nitrogen in TMWRF's effluent is comprised of dissolved organic nitrogen (DON). This research addressed the treatability of DON collected from different process streams at TMWRF using ozone (O3) …
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Relationships Among Soil Properties and Soil CO2 Efflux in a Loblolly Pine-Switchgrass Intercropped System
… of total soil CO2 efflux. Low molecular weight organic acids (LMWOAs), dissolved organic carbon (DOC) and dissolved organic nitrogen (DON), microbial biomass and activity were measured to evaluate the impact of intercropping switchgrass (Panicum virgatum L.) in a loblolly pine (Pinus taeda L.) …
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Effect of combined UV and free chlorine on the formation of chloronitromethanes
… MCNM forms in greater quantities at chlorine to nitrogen (Cl:N) ratios less than 3, while TCNM forms in greater quantities at Cl:N ratios greater than 3. Even so, the increase in TCNM formation did not increase linearly as the Cl:N ratio increased; there was a decreased rate of return when Cl:N …
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Controls on nitrogen fixation and nitrogen release in a diazotrophic endosymbiont of shipworms
Nitrogen fixation is an ecologically important microbial process that can contribute bioavailable combined N to habitats low in N. Shipworms, or wood-boring bivalves, host N2-fixing and cellulolytic symbiotic bacteria in gill bacteriocytes, which have been implicated as a necessary adaptation to an …
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Marine ecosystem model analysis using data assimilation
… microbial loop, a variable chlorophyll a to nitrogen ratio and dissolved organic nitrogen) led to larger improvements in model performance at BATS relative to NABE. Calibrated parameter values developed at NABE performed better than the default parameter values when applied at BATS. Solutions …
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The Biogeochemical Cycling of Dissolved Organic Carbon in the Iberian Margin Upwelling System (NE Atlantic Ocean
Dissolved organic carbon (DOC) is the quantitatively most important organic carbon reservoir in the world's oceans and its determination at ocean margins, where the exchange of terrestrial and oceanic organic matter occurs, is important for estimating cross-slope fluxes to deep waters. With the …
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Impact of operating conditions on thermal hydrolysis pre-treated digestion return liquor
… process (THP) can significantly add to the nitrogen load of a wastewater treatment plant (WWTP) and introduce UV quenching substances to the wastewater stream when recycled. While there are mature technologies in place to handle the inorganic nitrogen produced due to the thermal …
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Characterizing the effects of hydrothermal processes on bioactive compounds in wastewater bioenergy systems
… production processes that can be applied to wet organic-laden wastes, such as animal manures, municipal wastewater, and food processing wastes. In particular, we analyzed the impacts of a novel integrated process combining algal wastewater treatment with hydrothermal liquefaction (HTL) on the …
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Wastewater Carbon Diversion and Recovery via Primary Sludge Production, Thermal Hydrolysis, and Anaerobic Digestion
… cutting-edge technologies that enable wastewater organic carbon diversion and recovery through the enhancement of sludge production and blending, digestibility, dewaterability, and dewatered cake odor emission control. A comprehensive literature review showed that iron-based coagulants tend to …
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An Investigation of Dissolved Organic Matter in a Shallow Coastal Bay Subject to <i>Aureococcus anophagefferens</i> Blooms
… anophagefferens </em>is capable of using dissolved organic nitrogen (DON) and dissolved organic carbon (DOC) substrates to support growth, and this utilization is hypothesized to give the organism a competitive advantage relative to other phytoplankton when inorganic nutrient …
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Modeling macroalgae growth to optimize biomass.
… or ammonium (NH4) and phosphates (PO4) into dissolved organic nitrogen and phosphorus as well as both labile and refractory particulate organic nitrogen and phosphorus according to the CE-QUAL water-quality model built into EFDC. The ability to specify both nutrient concentrations and …
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The fate of anthropogenic nitrogen in a redox stratified pond: an isotopic approach
… biogeochemical effects accompanying increased nitrogen pollution. Cape Cod is home to roughly 1,000 ponds and lakes which play an important role in local ecosystems, but the cycling of nitrogen in these waters is not well understood. The goal of this research is to identify the major …
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Chemical characterization of dissolved organic matter (DOM) in seawater : structure, cycling, and the role of biology
… areas relating to the characterization of dissolved organic matter (DOM): further determination of the chemical compounds present in high molecular weight DOM (HMWDOM), the cycling of individual compounds within the HMWDOM pool, and the biological controls on DOM release. The first section …
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The influence of urbanization on runoff generation and stream chemistry in Massachusetts watersheds
… correlated with mean annual phosphate (PO4) or dissolved organic nitrogen (DON) concentrations. A multiple regression of wetlands plus open water percentage and septic density explains 51% of the variability in NO3 concentrations and highlights the potential importance of wetlands (sinks) and …
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Bioavailability of dissolved organic matter in coastal waters
Dissolved organic matter (DOM) is the largest reservoir of organic matter in the ocean containing the same amounts of carbon as atmospheric carbon dioxide. DOM consists of a mixture of compounds ultimately originating from terrestrial and aquatic plant, and microbial materials. The complex chemical …
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Effect of Process Intensification Techniques on Biosolids Management
… odor mitigation, as well as phosphorus and nitrogen removal. The first part of this study was conducted to understand the effect of anaerobic digester solids retention time (SRT) on odor emission from biosolids. A kinetic model and inhibitory studies showed the emission of methanethiol (MT), …
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