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.
Results
Showing 1 to 20 of 98 for “"organic nitrogen"”.
-
Characterisation of Algal Derived Organic Nitrogen
… of compounds comprising the dissolved organic nitrogen (DON) pool is an important task for chemical oceanographers wishing to understand its role in the marine N cycle. Low DON concentrations, problems with saline matrices and a lack of pre-concentration methods have all contributed to …
-
Dissolved organic nitrogen in the river test and estuary
… 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 systems. Advances …
-
Total and dissolved organic nitrogen analysis in an urban watershed
Thesis (M.Eng.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 2003.
-
Soil Organic Nitrogen - Investigation of Soil Amino Acids and Proteinaceous Compounds
Soil carbon (C) and nitrogen (N) are predominantly in organic form. Proteins/ peptides, as an important organic form of N, constitute a substantial part of soil organic matter. On one hand, proteins/peptides are an important N source for plants and microorganisms, particularly in soils where …
-
The formation of nitric oxide from organic nitrogen contained in fossil fuels.
Thesis: Ph. D., Massachusetts Institute of Technology, Department of Mechanical Engineering, 1973
-
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 …
-
Organic nitrogen uptake by marine algae: consequences for marine ecosystem functioning and biodiversity
Dissolved organic nitrogen (DON) represents a major pool of fixed, reactive nitrogen in marine systems. It is now recognized that this pool can support primary production and the ability of some algal species to exploit DON compounds as sources of Nitrogen (N) may indicate that specific DON …
-
Assessment and characterization of dissolved organic nitrogen removal in simulated soil aquifer treatment systems
… 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 by-products. In …
-
Characterization and treatment of organic matter, UV quenching substances, and organic nitrogen in landfill leachates
… although variations in leachate composition and organic loading continue to have negative impacts on downstream treatment processes. Leachate samples were collected from four landfills both before and after on-site treatment to evaluate the extent of biological treatment. The samples vary in age, …
-
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) …
-
Characterization and treatment of UV quenching substances and organic nitrogen in landfill leachates and thermal hydrolysis/anaerobic digestion centrate
… of the country. Biologically recalcitrant organic nitrogen, adds to effluent nitrogen making it difficult to meet these requirements. The study aimed at characterizing landfill leachate and centrate fractions to develop an understanding that might help design on-site treatment methods. …
-
Chemical Survey of Selected South Dakota Lake Sediments
Available phosphorus, organic carbon, and organic nitrogen were measured in bottom sediments of 16 lakes and ponds in northeast South Dakota. These lakes were glaciated, relatively shallow, and productive. Ranges of the surface sediments were: available phosphorus, 2 to 42 ppm; organic carbon, 0.94 …
-
Distribution of Colloidal Material in Activated Sludge as Influenced by Cations
… of the systems. The size distribution of organic nitrogen, organic carbon, protein, humic acid, and polysaccharide was examined with respect to the concentration of cations in the activated sludge influent. It was found that the majority of organic nitrogen, organic carbon, protein and …
-
Management strategy of landfill leachate and landfill gas condensate
… the UV disinfection in WWTPs. The other one is organic nitrogen, which can pass the nitrification-denitrification process and contribute to the effluent total nitrogen (TN). Also, treatability study was conducted for landfill gas (LFG) condensate. In a laboratory study, leachate samples were …
-
Treatment of Landfill leachates using anion exchange resins
… Landfill leachates contain bio-refractory organic matter which easily passes the biological treatment processes at WWTPs and increases the organic matter in the effluent. Leachates also interfere with the UV disinfection process at treatment plants. Another concern is the presence of large …
-
Nitrogen chemistry in an urban bioretention system in Singapore
An investigation into the nitrogen chemistry of the anoxic layer of an urban constructed wetland in Singapore was conducted. This pilot-scale wetland treats stormwater runoff from the Balam Estate housing development for several water quality parameters of concern, including nitrate. Earlier …
Page 1 of 5