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 15 of 15 for “"ammonia toxicity"”.
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Excretory nitrogen metabolism in the Chinese soft-shelled turtle, pelodiscus sinensis
… feeding, salinity stress, emersion and acute ammonia toxicity, on nitrogen metabolism and excretion in the Chinese soft-shelled turtle Pelodiscus sinensis. Pelodiscus sinensis is ureogenic and primarily ureotelic in freshwater. Our results reveal that a major portion of the urea was excreted …
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The Toxicity of Ammonia to Atlantic Silverside (Menidia menidia) and Ghost Shrimp (Palaemonetes pugio)
Ammonia is known to be toxic to aquatic organisms. The national water quality criteria for ammonia in the marine environment have been established to protect aquatic organisms from the toxicity of ammonia. Discharge into Chesapeake Bay has not yet been regulated under this criteria. Ammonia limits …
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Air stripping and biological treatment of ammonium sulfate wastewater from the caprolactam manufacturing process
… Air stripping removed fifty per cent of the ammonia-nitrogen at gas-to-liquid ratios greater than 500. However, it had no apparent effect on nitrifier inhibition. Inhibitor studies of this waste stream focused on two oximes: namely cyclohexanone oxime and methylethyl ketoxime (MEKO), which …
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Biological and physical treatment of crab processing industry wastewaters
… air stripping tower was studied for ammonia removal. Two anaerobic reactors which were fed retort process wastewater at F/M ratios of 0.35 and 0.25 lb COD/1b MLVSS/day, were found to achieve organics removals (on a BOD₅ basis) of 88% and 94% respectively. Similarly, a second pair of …
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Factors affecting the growth of Cladophora in relation to river pollution
… of field and laboratory results suggests that ammonia toxicity is attributable to the undissociated form. In the laboratory, 185 µg/1 undissociated ammoniacal nitrogen reduced specific growth rate to 50% of that at 10 µg/1 undissociated ammcniacal nitrogen. 0.077-1.057 mg/1 NO2-N had no …
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Anaerobic Co-digestion of Microalgae with Food Waste and Wastewater Sludge
… increased yields in all digesters, prevention of ammonia toxicity did not appear to be the mechanism. Instead, the co-substrates simply increased the concentration of readily-digestible organic carbon, leading to increased methane yields and productivities. For algae biomass, total ammonia …
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Evaluating the Feasibility of Rearing Juvenile Freshwater Mussels in a Flow-Through Pond System at White Sulphur Springs National Fish Hatchery
… were significantly more tolerant of unionized ammonia than juveniles of V. iris (mean 96 h LC50 of 0.11 mg/L NH3-N). The only organisms with reported LC50 values lower than those seen for V. iris juveniles were Ceriodaphnia dubia and Hyella azteca.
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Anaerobic Co-digestion of Wastewater Treatment Pond Algae with Wastewater Sludge
… the high protein content of algae can lead to ammonia toxicity in digesters. Co-digestion of algae with substrates containing higher C:N ratios (e.g., waste paper) can be used to maintain non-inhibitory ammonia concentrations and increase methane production. However, high carbon waste …
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The Effect of Dieoffs of Asian Clams (Corbicula fluminea) on Native Freshwater Mussels (Unionidae)
… of Corbicula population crashes that release ammonia and reduce dissolved oxygen in the sediment. Laboratory tests were conducted to determine the relative sensitivity of native mussel and Asian clam life stages to unionized ammonia, and mussel glochidia were the most sensitive (24-hr LC50 of …
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Acute toxicity of ammonia and nitrite to Pacific White Shrimp (Litopenaeus vannamei) at low salinities
… are gaps in the literature pertaining to the toxicity of ammonia and nitrite to shrimp. This study was conducted to investigate the individual and combined effects of ammonia and nitrite on L. vannamei postlarvae (25-45 days old) at 10 ppt salinity, 28 C and a pH of 7.8. The independent …
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Toxicological, physiological, and behavioral responses of the Asiatic clam, Corbicula sp., to biocidal and copper perturbations
… shock with chlorination, monochloramine, and ammonia as control agents of the Asiatic clam, Corbicula sp. Control procedures were evaluated based on lethal and sublethal responses (e.g., glycogen, tissue water, dry weight index, and siphoning activity) of clams during 30-day laboratory …
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Modeling risks associated with water reuse in agriculture
… sprayed water. Chapter 3 modeled the risks from ammonia toxicity, as well as infection with non-tuberculosis Mycobacteria (NTM) and Legionella pneumophila, with the intention of determining whether it is safer to anaerobically digest and disinfect wastewater prior to irrigation or to avoid …
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Zooplankton Dynamics in Wastewater Treatment High Rate Algal Ponds and development of effective control methods
… promotion of the lethal un-ionized ammonia toxicity, use of biocides, and the chitinase inhibitor chitosan; biocontrol using competitor and predatory organisms. In the laboratory tests CO₂ asphyxiation caused acute mortality of all zooplankton species (t<10 min). Increasing the …
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Organismi acquatici e ambiente: meccanismi biochimici di interazione, risposta e adattamento
… exposure to contaminants both of natural origin (ammonia nitrogen, the main contaminant of aquaculture plants) and of anthropic source (alkyltins). The two filter-feeding bivalve species selected colonize different habitats: the common mussel Mytilus galloprovincialis binds to hard substrates and …
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The feasibility of a commercial-scale recirculating aquaculture system integrating sea urchins (Tripneustes gratilla) and seaweed (Ulva)
… of the T. gratilla-Ulva IMTA model is a total ammonia nitrogen (TAN) sub-model, as TAN is the most limiting exchanged resource. Due to the lack of literature on T. gratilla nitrogen emissions and its complexity, an empirical ‘black box' approach using regression models was used for predicting …