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Showing 1 to 20 of 42 for “"BNR"”.
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Utilization of fixed film media in BNR activated sludge systems
… Project (VIP) biological nutrient removal (BNR) process. Four separate pilot-scale treatment trains were constructed and operated during this research. Three of the four treatment trains were operated with fixed film media (Ringlace/Captor) incorporated in the aerobic zone of the system and …
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Design and performance of BNR activated sludge systems with flat sheet membranes for solid-liquid separation
… clean wastewaters, biological nutrient removal (BNR) activated sludge (AS) is applied throughout South Africa and internationally as it has many advantages, notably it is cheaper to operate, does not introduce salinity into the water and is a simple and robust process. One of the key steps in the …
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An investigation of temperature effects on denitrifying bacterial populations in a biological nutrient removal (BNR) system
… process in a biological nutrient removal (BNR) system. Specifically, there were three objectives. First, the effects of temperature changes on denitrification rates by a bacterial population from a BNR system were investigated. Next, the role which PHAs (poly-beta-hydroxyalkanoates) played …
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Projeto de adequação de iluminação pública à ABNT BNR 5101:2024 estudo de caso em Maricá-RJ
A iluminação pública é considerada um serviço essencial à população, e que necessita portanto de um conjunto de normas que garantam que a prestação deste serviço seja realizada adequadamente. A ABNT NBR 5101:2024 estabelece os requisitos necessários para a iluminação de vias públicas a serem …
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Utilization of Captor sponges to maintain nitrification and denitrification in BNR activated sludge at low aerobic MCRTs
The performance of Captor media integration into the aerobic zone of an activated sludge wastewater treatment system operated at low MCRTs was evaluated using a pilot scale Virginia Initiative Project (VIP) process. Two separate trains were operated, one with Captor media incorporated into the …
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Effects of temperature and mean cell residence time on the performance of high-rate biological nutrient removal processes
… of Cape Town (UCT) biological nutrient removal (BNR) processes. A third system was operated as a conventional, fully aerobic activated sludge system for comparison. Less aerobic volume was needed to achieve complete nitrification in the BNR system than in the conventional system when temperature …
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Mechanisms of biological control of the damping-off fungus, Pythium ultimum, by binucleate Rhizoctonia / by K. Siwek.
… of Capsicum seedlings by two isolates of BNR against the damping-off fungus, P.u. sporangiiferum. Emphasis is placed on ecological attributes of the antagonists in relation to the pathogen, in conditions resembling those of the nursery environment for which biological control is intended. …
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Investigation of bacterial populations in a biological nutrient removal system
… pilot scale biological nutrient removal system (BNR) were studied. The objective of the research was to develop media and methods to identify bacterial populations in BNR systems. Samples were obtained from the last aerobic zone of a University of Cape Town (UCT)-type system. The most probable …
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ONLINE MONITORING OF NITROGEN GREENHOUSE GASES FROM WATER RECLAMATION PLANTS
… (WRP) engaging biological nutrients removal (BNR) processes can significantly increase urban N2O emissions, where N2O is produced from both nitrification and denitrification stages as an intermediate. As a response to the governmental concern of climate change, a study on online monitoring of …
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Characterizing Kinetic Shifts in Nitrifying, Denitrifying, and Phosphorus Removing Biomass Adapting to Low DO
… oxygen (DO) biological nutrient removal (BNR) is becoming a viable option to improve the energy efficiency of BNR. To properly model and design BNR processes for low DO operation, it is critical to fully understand how nitrifier, denitrifier, and polyphosphate accumulating organism (PAO) …
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An Investigation of the Biochemistry of 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 optimal design. One way to accomplish this would …
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Evaluation Of Prefermentation As A Unit Process Upon Biological Nutrient Removal Including Biokinetic And Wastewater Parameters
… comparison of identical continuous flow BNR processes both with and without prefermentation in order to provide a stronger, more quantitative, technical basis for design engineers to evaluate the potential benefits of prefermentation to EBPR in treating domestic wastewater. In addition, …
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Mathematical Modeling and Evaluation of Ifas Wastewater Treatment Processes for Biological Nitrogen and Phosphorus Removal
… the anoxic zones of biological nutrient removal (BNR) systems have not adequately been evaluated as well as the impacts of integrated media upon enhanced biological phosphorus removal (EBPR). Also, user-friendly software designed specifically to simulate the complex mixture of biological processes …
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Optimizing high-rate activated sludge: organic substrate for biological nitrogen removal and energy recovery
… 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 sludge processes, including …
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The removal of nitrogen and phosphorus in anoxic-aerobic digestion of waste activated sludge from biological nutrient removal systems
Biological nutrient removal (BNR) activated sludge systems (designed and operated with an additional function of biologically removing nitrogen and phosphorus) produce a waste activated sludge (WAS) that is rich in nitrogen (N) and phosphorus (P). When digested, this nitrogen and phosphorus are …
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Investigation of the Effects of COD/TP Ratio on the Performance of a Biological Nutrient Removal System
… the performance of biological nutrient removal (BNR) processes. Specific objectives of the research were to investigate the effects of COD/TP ratio on the rates of phosphorus removal, COD removal, nitrogen removal, PHB utilization and oxygen uptake. The system was fed with municipal wastewater …
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Design of an integrated fixed-film activated sludge (IFAS) system for possible application at the Borcherds Quarry WWTW
… process employing biological nutrient removal (BNR). Suspended nitrifiers only grow in the aerobic zone of the biological reactor but are subjected to anaerobic and anoxic conditions where no nitrifier growth takes place. To establish a nitrifier population that consistently produces low …
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Optimization of intermittent aeration for increased nitrogen removal efficiency and improved settling
… 1.5" 2 days without biological nitrogen removal (BNR). BNR is considered more cost-effective than comparable chemical and physical processes, but it requires considerable resources to meet increasingly strict discharge limits. As these limits decrease, the resource requirement increases, making …
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The Effect of Slowly Biodegradable Carbon on the Morphology, Integrity and Performance of Aerobic Granular Sludge
… that achieve biological nutrient removal (BNR) of both nitrogen and phosphorus. For both experimental phases, the hydraulic loading rate was 1.32 kg COD/m3/day. For the 1st phase, the three reactors were fed soluble organic matter (sodium acetate) as the sole carbon source with an …
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Advanced Biofilm and Aerobic Granulation Technologies for Water and Wastewater Treatment
… for stormwater biological nitrogen removal (BNR) is still largely unknown, as very limited research effort has been dedicated to this aspect. Thus, a mathematical model was developed to evaluate the potential of using BNR techniques for stormwater nitrogen removal. Aerobic granules are an …
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