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 114 for “"Dissolved oxygen (DO)"”.
-
The influence of denitrification in clarifiers on biological phosphorus removal at CCSD plant
… were occurring within the CCSD clarifiers. Dissolved oxygen (DO) and soluble COD concentrations were found to be the most influencing parameters on denitrification and P-release within the clarifiers. The results also showed that sludge blanket height (SBH), solid flux, and state point …
-
Analysis of temporal trends in southern Nevada wastewater pond parameters with an emphasis on ammonia removal
… retention time (HRT), alkalinity, pH, chemical oxygen demand (COD), biochemical oxygen demand (BOD), dissolved oxygen (DO), phosphorus, nitrates, and ammonia. Data on each pond and pond system are presented including pond system comparisons; A major focus of this paper is on ammonia-N removal. …
-
Tidal Influences on Bacterial and Phytoplankton Abundances and the Resulting Effects on Patterns of Dissolved Oxygen in the Skidaway River Estuary
… and biological processes contributing to the dissolved oxygen (DO) availability in the Skidaway River Estuary (SRE), Savannah, GA during the summer of 2005. A temporal study looked at changes in DO concentrations, Chlorophyll a concentrations, bacterial abundance, water depth, and salinity, …
-
Aplicação e calibração de um modelo matemático de qualidade de água
… Streeter and Phelps (1925), for predicting the Dissolved Oxygen (DO) and Biochemical Oxygen Demand (BOD) concentrations resulted from the discharge of biodegradable organic waste into river systems. The study presented here analyses the pollution behavior in a river and provides a methodology to …
-
Microbial Reduction of Perchlorate in Fixed Bed Biofilm Reactors for Water Treatment
… on the responses of a BAC to changes in influent dissolved oxygen (DO) levels was studied. The effect of mass transfer resistance that can reduce oxygen's negative effect on biological perchlorate removal was discussed. Chemisorption of oxygen onto GAC was found to enhance the performance of BAC …
-
Effects of Hypoxia on Embryonic Development and Hatching in Two Ambystoma and Two Rana Species
The concentration of dissolved oxygen (DO) available to amphibian embryos fluctuates widely and is often quite low. I investigated the effects of low DO (hypoxia) on embryonic development and hatching of two Ambystoma and two Rana species. In Ambystoma, hypoxia resulted in slowed development, …
-
Algal and protozoan response to Holocene climate change and anthropogenic impact: a case study from Sluice Pond, MA
… of cellulosic thecae are attributed to low dissolved oxygen (DO) in the basin. The fossil protozoan record supports the interpretation- thecamoebians were unable to colonize the basin until the middle Holocene and only became abundant when the drought-induced lowstand oxygenated the bottom …
-
Optimization of Nitrogen Removal Rate in One-Stage Reactor through Partial Nitrification Anammox Process during Direct Treatment of Poultry Litter Wastewater
… and even mainstream wastewater due to its low oxygen demand. However, anammox is not commonly utilized in the direct treatment of poultry litter because of the high organic content, which would inhibit the anammox process. Thus, this project is aimed at optimizing the nitrogen removal rate …
-
The redox and iron-sulfide geochemistry of Salt Pond and the thermodynamic constraints on native magnetotactic bacteria
… geochemical environment characterized by steep redox gradients at the interface. This chemocline is a habitat for magnetotactic bacteria (MB), and the spatial and temporal distribution of MB in the system along with geochemical (Fe2+, H2S, pH, 02 (aq), etc.) profiles have been analyzed from 2002 - …
-
Optimization of Fermentation Conditions for the Production of Legionaminic Acid in Recombinant Escherichia Coli
… carbon sources, induction temperatures, pH, dissolved oxygen (DO) content, induction optical density and N-acetylglucosamine (GlcNAc) feed rate on the production of legionaminic acid. Overall, results showed that the titer, yield and productivity for legionaminic acid production achieved …
-
Potencial influência do uso e ocupação do solo na qualidade da água do rio Abiaí-PB.
… concentration of pH, Thermotolerant Coliform, Dissolved Oxygen (DO), Color, Biochemical Oxygen Demand (BOD) and Turbidity. The analysis of the data showed that the river presents changes with regard to physical, chemical and biological parameters. The use map and land cover shows replacement of …
-
High density polyethylene (HDPE) containers as an alternative to polyethylene terephthalate (PET) bottles for solar disinfection of drinking water in northern region, Ghana
… idea behind the SOLAIR system is to keep high dissolved oxygen (DO) levels in the water which, in turn, enhances disinfection. A study done by Meyer et al. (2000), in South Africa, showed that regular shaking of the water-filled HDPE container keeps DO at sufficiently high levels to augment …
-
Sedimentation threats to Red Sea corals : an ecological study of reefs in the Hurghada Region, Egypt
… salinity, depth, pH, specific conductivity SPC, dissolved oxygen DO, total dissolved salts TDS, percentage of dissolved oxygen DO% and turbidity using a multprobe. Inorganic phosphates, silicate, ammonia, nitrite and nitrate concentrations were determined.Reefs were surveyed to determine a number …
-
Sensor data analytics and web applications to improve monitoring and understanding of lake processes
… Temperature, Depth) depth profiler, and a dissolved oxygen (DO) logger network that are the focus of this study. In this work, we develop three data analysis frameworks to support limnologists in more effectively collecting and analyzing these types of datasets, providing a lake system …
-
Influence of light and algae on nutrient transformations at the sediment-water interface of an agricultural stream
… the sediment water interface, and algae on dissolved organic carbon (DOC), nitrogen, and phosphorus within Maple Creek, an agriculturally impacted stream located in Fremont, Nebraska. Simultaneous continuous injection experiments into replicate open- and closed-bottom chambers were used to …
-
Diffuser Operations at Spring Hollow Reservoir
… bottom. The epilimnion remains saturated with dissolved oxygen (DO) from mass transfer with the atmosphere, while the hypolimnion continues to undergo oxygen-depleting processes. During seasons of high oxygen demand the hypolimnion often becomes anoxic and results in the release of compounds, …
-
Assessment of river-groundwater interactions in the Barotse floodplain, Western Zambia.
… analysed for stable isotope [deuterium (2H) and oxygen (18O)] to determine the origin and identify the relationships between ground and surface water. Statistical analysis was applied to determine the significance of the correlation between remote sensed data and ground based measurements …
-
Using Coagulation to Enhance the Performance of Filtration at the South Truckee Meadows Water Reclamation Facility
… of the reuse water at the South Truckee Meadows Water Reclamation Facility (STMWRF) in Reno, Nevada. Extensive jar testing was conducted on the water returning from Huffaker Reservoir and the effluent from the secondary clarifiers to determine the coagulant dosages and the pH conditions for …
-
A Comparative Analysis of Three Biofilter Types Treating Wastewater Produced in Recirculating Aquaculture Systems
… parameters tested were temperature (°C), pH, dissolved oxygen (DO), total ammonia-nitrogen (TAN), nitrite-nitrogen (NO₂⁻-N), nitrate-nitrogen (NO₃⁻-N), alkalinity (as CaCO₃), water hardness (as CaCO₃), carbonaceous biochemical oxygen demand (cBOD₃), dissolved organic carbon (DOC), and total …
-
Kinetics of Arsenopyrite Oxidative Dissolution by Oxygen
… mechanisms of arsenopyrite (FeAsS) oxidation by dissolved oxygen at 25°C and circumneutral pH. Release rates for iron, arsenic and sulfur are calculated for a variety of initial dissolved oxygen (DO) concentrations. Results indicate that the rate of arsenopyrite oxidation, represented by the rate …
Page 1 of 6