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Showing 1 to 20 of 24 for “"biological nitrogen removal"”.
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Kinetics of biological nitrogen removal in a single sludge activated sludge process
The objective of this investigation was to develop experimental set-ups and operational procedures for accurate and reliable evaluation of the kinetic constants and sewage characteristics that influence nitrification and denitrification in the single sludge nitrification-denitrification activated …
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Optimizing high-rate activated sludge: organic substrate for biological nitrogen removal and energy recovery
… are also being utilized upstream of shortcut biological nitrogen removal (BNR) processes as these BNR processes often require a controlled influent carbon to nitrogen ratio that is lower than required for conventional BNR processes. While there is extensive knowledge on conventional activated …
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Optimization of Biological Nitrogen Removal From Fermented Dairy Manure Using Low Levels of Dissolved Oxygen
A pilot scale nitrogen (N) removal system was constructed and operated for approximately 365 days and was designed to remove inorganic total ammonia nitrogen (TAN) from solids-separated dairy manure. An anaerobic fermenter, upstream of the N removal reactor, produced volatile fatty acids (VFAs), to …
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Nitrification and denitrification: biological nitrogen removal and sludge generation at the York River treatment plant
Data from Hampton Roads Sanitation District was used to calculate nitrification and denitrification rates for the A²/O mode (1987) and the VIP mode (1988) of operation. Nitrification and denitrification rates compared to literature values for similar sludge ages. The mean VIP nitrification rate was …
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The carbon footprint analysis of wastewater treatment plants and nitrous oxide emissions from full-scale biological nitrogen removal processes in Spain
… wastewater treatment plants (WWTPs) with biological nitrogen removal processes, using a life cycle assessment (LCA) approach. Literature on greenhouse gas (GHG) emissions and LCA are reviewed and the methodology employed in the analysis is discussed. Two selected WWTPs in Madrid, Spain, …
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Simultaneous partial Nitritation, Anammox and Denitrification (SNAD) process for treating ammonium-rich wastewaters
Biological nitrogen removal from strong ammonium wastewaters received a great deal of attention during the last years. Since the discovery of anammox bacteria the traditional theory of biological nitrogen removal has been extended to new nitrogen metabolic pathways. This thesis deals with the study …
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Nitrogen Removal From Dairy Manure Wastewater Using Sequencing Batch Reactors
… and stoichiometric parameters associated with nitrogen removal from the wastewater, as well as to demonstrate experimental and simulated nitrogen removal from the wastewater. The characterization showed that all the wastewaters had carbon to nitrogen ratios large enough for biological nitrogen …
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Development of High Efficiency Partial Nitrification as a First Step of Nitrite Shunt Process using Ammonium-Oxidizing Bacteria (AOB)
Shortcut biological nitrogen removal is a non-conventional way of removing nitrogen from wastewater using two processes either nitrite shunt or deammonification. In this research, a complete partial nitrification as a first step of the Nitrite Shunt process has been developed under a high nitrogen …
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Anammox-based Technologies for Sustainable Mainstream Wastewater Treatment: Process Development, Microbial Ecology and Mathematical Modeling
… is an efficient and cost-effective approach for biological nitrogen removal, but its application in treating mainstream wastewater remains a great challenge. The key objectives of this dissertation are to develop nitritation-anammox process to treat wastewater with low-nitrogen strength, …
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The effect of temperature on denitrification kinetics and biological excess phosphorus removal in nutrient removal activated sludge systems in temperate climates (12°C - 20°C)
Filamentous bulking in nutrient (N & P) removal activated sludge systems is a problem of considerable magnitude - three quarters of 45 plants surveyed were found to have bulking sludges to the extent that sludge settleability (DSVI) was adversely affected. If filamentous organism proliferation …
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Dynamics of Simultaneous Nitrite Ion and Ammonia Chlorination in Complex Water Quality Matrices and their Impact on Chlorine Residual Speciation during Disinfection
… fully understood. The coexistence of the two nitrogen compounds is a phenomenon most often encountered during biological nitrification of municipal wastewaters. The spatial variation of the nitrogen species generates unpredictable complications in the effectiveness of chlorination as the …
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Startup Strategies for Mainstream Anammox in Moving Bed Biofilm Reactors (MBBRs)
Partial denitrification/anammox (PdNA) is a biological nitrogen removal technology with significant carbon and aeration savings when compared with conventional nitrification/denitrification. Yet despite these benefits, the use of PdNA in mainstream wastewater treatment remains limited. One of the …
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Advanced Biofilm and Aerobic Granulation Technologies for Water and Wastewater Treatment
Attached growth biological processes offer advantages over traditional water purification technologies through high biomass retention, easy sludge-water separation, multiple multispecies synergies in proximity, resilience to shock loading, low space requirements, and reactor operational …
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Submerged-Membrane Bioreactor for the Treatment of NASA Wastewater
… consumables that add to stowage space and mass. Biological pretreatment systems offer a potential means of improving wastewater treatment by using microorganisms to utilize contaminants as either as source or sink for electrons; processes well understood in terrestrial wastewater treatment …
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Dairy Manure Flushwater Treatment by Packed-Bed Anaerobic Digesters
… to improve biogas production and organic matter removal at ambient temperatures. Reciprocation has been used in biological nitrogen removal systems to introduce air into the system to repeatedly oxygenate nitrifying biofilm along with mixing (Behrends et al. 2003), but the anaerobic systems …
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Optimization of intermittent aeration for increased nitrogen removal efficiency and improved settling
Nitrogen, when present in excess, can cause eutrophication in waterways, which may result in hypoxia and the desertion or death of aquatic life. As nitrogen continues to pollute our water, wastewater discharge limits are becoming more stringent with effluent limits based on preserving receiving …
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Fate and Effect of Peracetic Acid Solutions on Biological Wastewater Treatment Systems
… to control food-borne pathogens. Upsets of biological wastewater treatment processes and failures of whole effluent toxicity (WET) tests have been reported as potentially caused by the excessive use of PAA solutions. However, information related to the fate and effect of PAA on biological …
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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
… at the Hampton 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 …
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Experimental testing and modeling of partial nitrification at different temperatures
Nitrogen in wastewater treatment plant effluents has adverse environmental effects on aquatic systems. Excessive concentrations of nitrogen in water bodies can result in the depletion of dissolved oxygen, deterioration of water quality, and shifts of biotic community. Conventional biological …
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Structural and Functional Microbial Ecology of Denitrifying Bacteria Using Different Organic Carbon Sources
… organic carbon sources for denitrification in biological nitrogen removal systems. It is expected that such judicious selection can also eventually result in better design, operation and control of engineered nitrogen removal processes and thus help attain ever more stringent nitrogen standards.
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