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Showing 1 to 20 of 20 for “"nitritation"”.
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Simultaneous partial Nitritation, Anammox and Denitrification (SNAD) process for treating ammonium-rich wastewaters
… deals with the study of Simultaneous partial Nitritation, Anammox and Denitrification (SNAD) process in a Sequencing Batch Reactor (SBR) to treat wastewaters with a high ammonium load and low biodegradable organic matter, such as anaerobic digester effluent and old landfill leachate. The …
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Anammox-based Technologies for Sustainable Mainstream Wastewater Treatment: Process Development, Microbial Ecology and Mathematical Modeling
The nitritation-anammox process 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 …
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Pilot Scale Application of Partial Nitritation Anammox and Partial Denitrification Anammox Treating Industrial Fertilizer Waste with High Ammonia and Nitrate
… The first method, partial nitritation anammox (PNA) is very effective at removing high strength NH4 from wastewater. Although PNA is effective in removing NH4, it does not remove NO3, which is why the second method of shortcut removal incorporated in this study is partial …
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Mathematical Modeling for Nitrogen Removal via a Nitritation: Anaerobic Ammonium Oxidation-Coupled Biofilm in a Hollow Fiber Membrane Bioreactor and a Rotating Biological Contactor
Mathematical models of a nitritation: anaerobic ammonia oxidation (anammox)-coupled biofilm in a counter-diffusion hollow fiber membrane bioreactor (HFMBR) and a nitritation: anammox-coupled biofilm in a co-diffusion rotating biological contactor (RBC) were developed and implemented using AQUASIM. …
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The Economic and Technical Feasibility of the Application of Partial Nitritation Anammox Technology Over Conventional Nitrification Denitrification for the Treatment of Sidestream Liquor at Cape Flats WWTP
… (MLE) configuration) with a novel partial nitritation/ anammox (PN/A) process. The sidestream liquor was characterised by mass balance over the AD process. Steady-state models were used to predict equipment sizes and determine the process efficiency for each treatment technology. The models …
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Mechanistic Understanding of the NOB Suppression by Free Ammonia Inhibition in Continuous Flow Aerobic Granulation Bioreactors
A partial nitritation-anammox continuous flow reactor (CFR) was operated for eight months demonstrating that a mixture of large anammox-supported aerobic granules (ASAGs) and small conventional aerobic granules (CAGs) can be maintained stably for extended periods of time. The influent NH4+ was kept …
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EXPLORING INNOVATIVE TECHNOLOGIES FOR NUTRIENT REMOVAL AND RECOVERY FROM AGRO-INDUSTRIAL WASTEWATER: ANAMMOX AND ELECTROCHEMICAL PROCESSES
… effluent). Particularly, the single-step Partial Nitritation/Anammox (PN/A) and the electrochemical mediated precipitation processes were explored with the aim of nutrient recovery.
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Mathematical Modeling of Carbon Removal in the A-Stage Activated Sludge System
… suitability for a downstream nitrite shunt (i.e. nitritation/denitritation) process. In the downstream process the goal is to eliminate nitrite oxidizing bacteria (NOB) from the reactor while selecting for ammonia oxidizing bacteria (AOB). The results showed that a low SRT (< 0.25 d) can produce …
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Assessment of a Fixed Media Partial Denitrification/Anammox Process Startup in a Full-Scale Treatment Train
… of the more familiar mainstream partial nitritation anammox (PNA) process. The PdNA process can be used to effectively remove ammonia, nitrate, and nitrite from mainstream municipal waste streams. To retain slow growing anammox, some sort of retention system is needed with media being a …
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La nitrification dans le cadre du traitement des eaux usées: production de nitrites, préservation des nitrifiants et effet d'un support
… favorisant les bactéries responsables de la nitritation. Pour cela, des systèmes d’étude en continu sont mis en place. Lors de cette expérience, il est apparu nécessaire de toujours disposer d’inocula stables. C’est pourquoi, dans le second chapitre, nous avons testé différentes méthodes de …
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Intensification of Biological Nutrient Removal Processes
… processes; including nitrite shunt, partial nitritation/anammox, and partial denitrification/anammox, as well as low-carbon biological phosphorus removal, were critically-evaluated in this study with an overall objective of intensification of existing infrastructure. At the beginning of this …
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Startup Strategies for Mainstream Anammox in Moving Bed Biofilm Reactors (MBBRs)
… specifically used for sidestream partial nitritation/AMX, is with biomass augmentation, which is practically unrealistic for full-scale mainstream applications. Thus, this study evaluated startup strategies for mainstream PdNA without AMX inoculation in moving bed biofilm reactors (MBBRs) …
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Novel Reactors for Biological Treatment of High Strength Nitrogen and Carbon Wastewater
… objective was focused on using a combination of nitritation-denitrification and anammox (NDX) processes in a single-stage reactor containing low-density foam media to evaluate the treatment of a space-based wastewater with high N low C/N ratio. The first objective of this research demonstrates …
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Zeolite Incorporated Materials for Targeted Biomass Retention and Pollutant Removal
… carriers were designed to facilitate the partial nitritation-anammox (PNA) processes in mainstream wastewater, where significant cost savings and improved treatment could be realized. Zeolite particles and zeolite coated membranes in batch systems fed with mainstream-like synthetic wastewater …
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Deammonification Process Kinetics and Inhibition Evaluation
… that oxidizes half of the ammonia to nitrite (nitritation) in a separate reactor such as in the SHARON process, or in the same reactor such as in the DEaMmONification (DEMON) process. Despite intensive laboratory research for the last 10 years to fully understand these processes, there is still …
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Treatment of High-Strength Nitrogen Wasetewater With a Hollow-Fiber Membrane-Aerated Biofilm Reactor: A Comprehensive Evaluation
… metabolisms, partial nitrification to nitrite (nitritation) and anaerobic ammonium oxidation, was demonstrated in a single HFMBR. The system successfully treated a high-strength nitrogen wastewater intended to mimic a urine stream from such sources as extended space missions. For the last 250 …
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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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Performance and metagenomic microbial analysis of a novel, pilot-scale reactor with rotating algal contactors used to treat anaerobic digester sludge filtrate containing high total ammonia
This report details our investigation of a novel, fixed-biofilm algal and bacterial system for the treatment of high-strength municipal anaerobic digester filtrate. Each reactor in the pilot-scale system comprises multiple AlgaewheelTM rotating algal contactors (RACs) that help efficiently …
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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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Comparison of Aeration Strategies for Optimization of Nitrogen Removal in an Adsorption/Bio-oxidation (A/B) Process with an Emphasis on Ammonia vs. NOx (AvN) control
Research was performed at a pilot-scale wastewater treatment plant operating an adsorption/bio-oxidation (A/B) process at 20C. The study compared B-Stage performance under DO Control, Ammonia Based Aeration Control (ABAC), and Ammonia vs. NOx (AvN) control. AvN in 1) fully-intermittent and 2) …