dissolved oxygen controller Articles
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Boiler Dissolved Oxygen Control
DISSOLVED OXYGEN CHEMISTRY Dissolved Oxygen (DO) is a measure of the amount of oxygen, usually thought of as a gas, that is dissolved in a liquid such as water. Oxygen is essential to life and is also the most common element found taking part in corrosion reactions. DO can be thought of as the fuel needed for the corrosion process to proceed. It is the corrosion reactions that necessitate trace ...
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Adaptive predictive expert control of dissolved oxygen concentration in a wastewater treatment plant
In this paper we present the application of adaptive predictive expert controllers to dissolved oxygen (DO) control in the aerobic reactors of a wastewater treatment plant. The control system described in this paper consists of adaptive predictive expert control loops complemented by optimisation logic. The controllers successfully cope with nonlinearity and changing operating conditions of the ...
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Influence of denitrification reactor retention time distribution (RTD) on dissolved oxygen control and nitrogen removal efficiency
Low concentrations of dissolved oxygen (DO) are usually found in biological anoxic pre-denitrification reactors, causing a reduction in nitrogen removal efficiency. Therefore, the reduction of DO in such reactors is fundamental for achieving good nutrient removal. The article shows the results of an experimental study carried out to evaluate the effect of the anoxic reactor hydrodynamic model ...
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Effect of sensor location on controller performance in a wastewater treatment plant
Complete mixing is hard to achieve in large bioreactors in wastewater treatment plants. This often leads to a non-uniform distribution of components such as dissolved oxygen and, hence, the process rates depend on them. Furthermore, when these components are used as input for a controller, the location of the sensor can potentially affect the control action. In this contribution, the effect of ...
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Mechanism studies on nitrogen removal when treating ammonium-rich leachate by sequencing batch biofilm reactor
The nitrogen removal mechanism was studied and analyzed when treating the ammonium-rich landfill leachate by a set of sequencing batch biofilm reactors (SBBRs), which was designed independently. At the liquid temperature of (32 ± 0.4)°C, and after a 58-days domestication period and a 33-days stabilization period, the efficiency of ammonium removal in the SBBR went up to 95%. Highly frequent ...
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Cardiff WWTW aeration optimisation through scientific control
Aeration optimisation of a 16 basin SBR plant running in ICEAS (Intermittent Cycle Extended Aeration System) mode was under taken by changing the operating parameters from the traditional design of dissolved oxygen (DO) control to a scientific approach using respirometry. Measuring the critical oxygen point for carbonaceous and nitrification bacteria and combining this with in-situ Oxygen Uptake ...
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Case study - Industrial ASBR wastewater treatment facility, India
This two (2) basin ASBR facility near Mumbai, receives a variety of industrial wastewaters collected from many factories and chemical production facilities. The 10,000 m3/d wastewater plant comprises flow metering, chemical treatment, pH correction, flow splitting, flow equalization with aeration, chemical precipitation and lamella plate clarification, two (2) basin ASBR biological treatment ...
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Industrial ASBR Wastewater Treatment Facility, India - Case Study
This two (2) basin ASBR facility near Mumbai, receives a variety of industrial wastewaters collected from many factories and chemical production facilities. The 10,000 m3/d wastewater plant comprises flow metering, chemical treatment, pH correction, flow splitting, flow equalization with aeration, chemical precipitation and lamella plate clarification, two (2) basin ASBR biological treatment ...
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Aerator retrofit enables city to meet nitrogen limits - Case Study
Problem The City of Ocala, Fla., faced tighter effluent nitrogen limits due to the presence of springs in the St. John’s River basin. The city operates an Ovivo Carrousel plant. Solution Rather than add basins, the city retrofitted the Carrousel basins with dual-impeller Excell aerators and the automated internal recycle EliminatIR gate from Ovivo USA. Result The retrofits have allowed ...
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Effect of carbon sources on nitrous oxide emission in a modified Ludzak Ettinger process
Effect of methanol and glycerol on nitrous oxide (N2O) emission in two laboratory-scale modified Ludzak Ettinger (MLE) processes was investigated during three distinct periods: dissolved oxygen (DO) control by intermittent aeration with a DO controller, and high and low aeration rates. N2O consumption rate in an anoxic tank and aeration mode influenced N2O emission rates from the MLE processes. ...
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TB 47: The kori nuclear power plant uses liqui-cel membrane contactors for liquid degassing
Dissolved oxygen is a leading source of corrosion in water systems and it is carefully monitored and controlled in nuclear power plants. The Korean Electric Power Institute (KEPRI) has installed Liqui-Cel Membrane Contactors in the Kori nuclear power plant in South Korea. The membranes have been in operation since 2000 and have successfully met the rigorous demands of the nuclear power industry. ...
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TB 48: Wolsung nuclear power plant uses liqui-cel membrane contactors for dissolved oxygen removal to prevent corrosion
Dissolved oxygen is a leading source of corrosion in water systems. The Korean Electric Power Institute (KEPRI) has installed Liqui-Cel Membrane Contactors in the Wolsung nuclear power plant in South Korea. The membranes have been in operation since 2000 and have successfully met the rigorous demands of the nuclear power industry. The Wolsung unit 1 plant is a pressurized heavy water type ...
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Evaluation of a novel oxidation ditch system for biological nitrogen and phosphorus removal from domestic sewage
A novel oxidation ditch system using anaerobic tanks and innovative dual dissolved oxygen (DO) control technology is proposed for biological nitrogen and phosphorus removal from domestic sewage. A continuous bench-scale experiment running for more than 300 days was performed to evaluate the system. Monitoring and controlling the airflow and recirculation flow rate independently using DO values at ...
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Aeration control – a review
This review covers automatic control of continuous aeration systems in municipal wastewater treatment plants. The review focuses on published research in the 21st century and describes research into various methods to decide and control the dissolved oxygen (DO) concentration and to control the aerobic volume with special focus on plants with nitrogen removal. Important aspects of control ...
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Kelda Water Services - Cardiff
Strathkelvin achieved annual savings of £380,000, 26% energy reduction, 3.9GWh and 2994 tonnes of carbon reduction per annum for this client in relation to aeration energy optimisation. The aeration optimisation of a 16 basin SBR plant running in ICEAS (Intermittent Cycle Extended Aeration System) mode was under taken by changing the operating parameters from the traditional design of ...
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Research on applying a water-lifting aerator to inhibit the growth of algae in a source-water reservoir
A new hydraulic, water-lifting aerator was developed for ameliorating water quality. It aims at mixing lower and upper water bodies, controlling algae growth, increasing dissolved oxygen concentration in water and inhibiting the release of pollutants from sediments. This new device was applied to control the algae growth in surface water of the water source of Tianjin. It was found that the ...
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Influence of dissolved oxygen concentration and aeration time on nitrite accumulation in partial nitrification process
This study investigated the influence of dissolved oxygen concentration and aeration time on nitrification and nitrite accumulation in an attempt to optimize the recently developed biological-partial-nitritation process for the treatment of strong nitrogen wastewaters. Investigation of dissolved oxygen concentration on ammonium and nitrite oxidation was carried out in a batch reactor. The ...
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Seasonal influence of environmental variables and artificial aeration on Escherichia coli in small urban lakes
This study investigated patterns of Escherichia coli in urban lakes in Lubbock, Texas. Specific objectives were to (1) document seasonal patterns in abundance of E. coli over a 3-year period, (2) identify environmental factors, including effects of migratory geese and artificial aeration devices that may influence E. coli abundance, and (3) determine if E. coli abundance over time was similar ...
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Stir it up: Five tips for more effective industrial aeration
We all know that aeration is a simple but versatile secondary treatment, with uses ranging from removing gases and dangerous compounds from wastewater, to encouraging the action of microbes as they break down solids. If you’re using aeration in an industrial setting, you may be producing streams with concentrations of biological oxygen demand (BOD), chemical oxygen demand (COD), and ...
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Monitoring and control of a partially packed biological aerated filter (BAF) reactor for improving nitrogen removal efficiency
This paper examines on-off systems and automatic monitoring and control of a biological aerated filter to identify the end point of nitrification and denitrification processes, and chemical oxygen demand (COD), ammonia-nitrogen removal (NH3-N) and aeration savings. Oxidation-reduction potential (ORP), pH and dissolved oxygen (DO) were measured on-line and chemical parameters were measured in the ...
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