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 129 for “"Phosphorus Removal"”.
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Substrate induced failure of biological phosphorus removal
The possibility that the biological phosphorus removal mechanism can be inhibited in a continuous flow process by acetic acid passing through into the anoxic and aerobic zones of the reactor was investigated. The objectives of the research were to determine the amenability of a wastewater from the …
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Coagulation techniques for phosphorus removal from agricultural wastewater
Made available in DSpace on 2022-01-12T22:55:05Z (GMT). No. of bitstreams: 3 BAILEY-DISSERTATION-2021.pdf: 4291429 bytes, checksum: 184a4890e8177a173eef373115ddb23e (MD5) LICENSE.txt: 4210 bytes, checksum: fedd4ee75518db93dc9c3b536b7c394f (MD5) PROQUEST_LICENSE.txt: 4556 bytes, checksum: …
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Biological excess phosphorus removal in activated sludge systems
… South Africa that accomplish biological excess phosphorus (P) removal, the UCT and modified Bardenpho systems. To predict the P removal in these systems, an empirical model had been developed. In the empirical model, P removal was formulated in terms of some of the system parameters, such as …
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Biological nitrogen and phosphorus removal on large plants.
Full scale implementation of biological excess phosphorus removal by means of the activated sludge process commenced in South Africa at the Johannesburg Alexandra Plant in 1974. Originally the plant was designed to operate in the nitrifying extended aeration mode; but by switching off some surface …
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Phosphorus removal in the modified activated sludge process
… luxury biological uptake contributes to excess removal of phosphorus in activated sludge systems, i.e. removal in excess of the basic biological requirement for metabolic purposes. This objective was pursued by imposing conditions in which one or the other of the two mechanisms had negligible …
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Enhanced Biological Phosphorus Removal for Liquid Dairy Manure
Enhanced biological phosphorus removal (EBPR) has been widely used in municipal wastewater treatment, but no previous studies have examined the application of EBPR to treat dairy manure. This study was conducted to evaluate the (i) performance of pilot-scale EBPR systems treating liquid dairy …
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An Investigation of the Biochemistry of Biological Phosphorus Removal
Although enhanced biological phosphorus removal (EBPR) and complete biological nutrient removal (BNR) systems can be operated successfully by experienced operators, the accuracy of design and strength of the scientific background need to be reinforced to enable accurate modeling and economically …
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The Investigation of Nitrite Accumulation and Biological Phosphorus Removal in an Intermittently Aerated Process Combining Shortcut Nitrogen Removal and Sidestream Biological Phosphorus Removal
… Road Sanitation District's biological nutrient removal pilot, located at the Chesapeake-Elizabeth WWTP in Virginia Beach, VA. The pilot is operated in an A/B process with a high-rate, carbon-diverting A-stage, followed by a biological nitrogen removal B-stage containing four intermittently …
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Dissolved phosphorus removal in denitrifying bioreactors: field and laboratory studies
… subsurface agricultural drainage water. However, phosphorus (P) removal has been observed in bioreactors across Illinois. Both N and P play an important role in eutrophication and hypoxia in the Gulf of Mexico. Therefore, it is important to evaluate P dynamics in denitrifying bioreactors. The …
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Kinetics of enhanced phosphorus removal in the activated sludge process
An investigation into the removal of phosphorus in the activated sludge process showed that: (1) Luxury uptake of phosphorus may be induced by the presence of an anoxic zone (2) If a primary and secondary anoxic reactor are present in the system, the actual retention time of the primary anoxic …
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Chemical and biological phosphorus removal in the activated sludge process
… set out to establish in what degree the phosphorus removal characteristics of the Modified Activated Sludge Process could be enhanced by the in-plant addition of iron salts. The motivation for the investigation was: 1. Due to the lack of understanding of the exact pre-requisites for …
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Tracking Inorganic Solids in Biological Enhanced Phosphorus Removal Wastewater Treatment Systems
… WWTP unit operations. For the biological removal of organics or nitrogen, this limited information on inorganic solids has no implications as the inorganic solids (sediments) do not interact with the biochemical processes of the WWTP units. For enhanced biological phosphorus removal (EBPR) …
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Denitrification kinetics in biological nitrogen and phosphorus removal activated sludge systems
… size the anoxic reactors in nutrient (N and P) removal activated sludge plants, it is essential to know the denitrification kinetics that are operative in such systems. To date, denitrification kinetics have been accurately defined only for systems that remove N alone; little research has been …
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Biological excess phosphorus removal in short sludge age activated sludge systems
… of short sludge age biological excess P removal systems, to assess the response of the systems under non-nitrifying and nitrifying conditions, to determine the optimal system configuration(s) and operational parameters, and to check the settling characteristics of the mixed liquor …
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The role of metals in enhanced biological phosphorus removal from wastewater
The role of metal cations in enhanced biological phosphorus removal (EBPR) from wastewater by activated sludge was investigated. Potassium and magnesium were simultaneously required for efficient EBPR. Neither potassium nor magnesium could induce enhanced phosphorus uptake on its own. Cations were …
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Investigation of hypothesized anaerobic stabilization mechanisms in biological phosphorus removal systems
… previously observed in biological nutrient removal (BNR) systems that use anaerobic-aerobic sequencing for phosphorus and/or nitrogen removal. AnS manifests itself in the form of less-than-theoretical oxygen requirements for the extent of organics stabilization observed. The objectives of …
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Quantification of complex phosphorus removal reactions occurring within wetland filtration treatment systems
… increased operational experience indicate that phosphorus removal is variable or inconsistent, especially in cold-climate applications. These inconsistencies can be attributed to the complexity of phosphorus removal mechanisms, and the lack of consideration of these complexities in the design, …
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Development of Low Energy Aeration System For Enhanced Biological Phosphorus Removal (EBPR)
… due to the oxygen and chemicals requirement. Phosphorus removal is an important part of wastewater treatment process; Enhanced Biological Phosphorus Removal (EBPR) is one of the main processes responsible for phosphorus removal in wastewater treatment plants. EBPR consist of two major phases: …
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Biogeochemistry of denitrifying bioreactors to enhance phosphorus removal from agricultural subsurface drainage
… drainage can also contribute to the loss of phosphorus from agricultural soil. Therefore, this thesis investigates the potential of DBRs to incorporate iron-based materials to sequester phosphorus and reduce pollution of waterways. There is some evidence suggesting low-level phosphorus …
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