process dissolved oxygen sensor Articles

  • Dissolved Oxygen – the discussion moves on

    Do Dissolved Oxygen Sensors need Cleaning? The re-emergence of Optical Dissolved Oxygen Sensors around 6-7 years ago generated a lively and interesting discussion which revolved around the relative merits of Optical and Galvanic Dissolved Oxygen sensors. We understand that opinions will differ, so in order to accommodate our customers preferences we are pleased to offer our OxyTechw² ...


    By Partech (Electronics) Ltd.

  • 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 ...


    By IC Controls Ltd.

  • Why it is important to measure Dissolved Oxygen in aeration lanes

    Dissolved Oxygen is a key parameter in the efficient treatment of waste water during the secondary treatment stage; the point at which organic waste is oxidised to form carbon dioxide, water and nitrogen compounds. It is important to act on accurate measurements of Dissolved Oxygen in activated sludge plants for the following reasons: To ...


    By Partech (Electronics) Ltd.

  • Why it is important to measure Dissolved Oxygen in aeration lanes

    Dissolved Oxygen is a key parameter in the efficient treatment of waste water during the secondary treatment stage; the point at which organic waste is oxidised to form carbon dioxide, water and nitrogen compounds. It is important to act on accurate ...


    By Partech (Electronics) Ltd.

  • The optimal dissolved oxygen profile in a nitrifying activated sludge process – comparisons with ammonium feedback control

    Ammonium feedback control is increasingly used to determine the dissolved oxygen (DO) set-point in aerated activated sludge processes for nitrogen removal. This study compares proportional-integral (PI) ammonium feedback control with a DO profile created from a mathematical minimisation of the daily air flow rate. All simulated scenarios are set to reach the same treatment level of ammonium, ...


    By IWA Publishing

  • Product of the Month – Handy Polaris 2 Portable Dissolved Oxygen Meter with Datalogger

    This month the focus is on the Handy Polaris 2 Portable Dissolved Oxygen Meter with Datalogger. Over the summer months we have seen increased interest in the instrument. Warmer temperatures can affect the chemistry, biological processes and dissolved oxygen levels in water, making the Handy Polaris 2 a popular ...


    By Partech (Electronics) Ltd.

  • Fault detection and isolation of sensors in aeration control systems

    In this paper, we consider the problem of fault detection (FD) and isolation in the aeration system of an activated sludge process. For this study, the dissolved oxygen in each aerated zone is assumed to be controlled automatically. As the basis for an FD method we use the ratio of air flow rates into different zones. The method is evaluated in two scenarios: using the Benchmark Simulation ...


    By IWA Publishing

  • 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 ...


    By IWA Publishing

  • On-Line Nitrate/Nitrite Probes for BNR Process Control

    ABSTRACTReal time nitrogen monitoring plays an increasingly important role for the successful biological nutrient removal at wastewater treatment plants. Though traditionally dissolved oxygen has been the main process control parameter a greater understanding of the biological mechanisms and process conditions like nitrite/nitrate concentrations to achieve lower effluent values becomes necessary, ...

  • Optical DO Sensors Opening Doors to Online Aeration Control

    BACKGROUNDThe benefits of using online, automated control of aeration systems using dissolved oxygen (DO) sensors are well known in the industry and have been widely documented (e.g. Olsson et al, 2005). In most wastewater treatment facilities using activated sludge, the electricity provided to the aeration system is one of the most significant operating costs and a good control system can help ...

  • Dynamic control of nutrient-removal from industrial wastewater in a sequencing batch reactor, using common and low-cost online sensors

    On-line control of the biological treatment process is an innovative tool to cope with variable concentrations of chemical oxygen demand and nutrients in industrial wastewater. In the present study we implemented a simple dynamic control strategy for nutrient-removal in a sequencing batch reactor (SBR) treating variable tank truck cleaning wastewater. The control system was based on derived ...


    By IWA Publishing

  • Customer Case - Hampton Roads Sanitation District

    At HRSD, the regional wastewater treatment utility that serves southeast Virginia, process engineers and researchers are working with the development of novel processes for nutrient removal from wastewater. One of the primary focuses is the application of the deammonification process directly in the mainstream. Currently, HRSD is operating a fully integrated pilot process and as part of the ...


    By Unisense Environment A/S

  • Granularity determination of activated sludge through on-line profiles by means of case-based reasoning

    Aerobic granulation from floccular sludge is difficult to detect in first stages with the naked eye. This work proposes a combination of multi-way principal components and case-based reasoning to predict the granulation state of a sequencing batch reactor, based solely on the on-line registered profiles of common sensors (i.e. pH, dissolved oxygen and oxidation-reduction potential). The ...


    By IWA Publishing

  • Wastewater treatment down-time `not acceptable`

    Reliable 24/7 monitoring and control of a pharmaceutical company's wastewater facility is fundamentally important to the successful operation of the entire business. This is because failures or down-time in the wastewater treatment process would quickly result in waste stream back up. It follows therefore that monitoring equipment should be extremely reliable and this is why Shasun Pharma ...


  • Determination of the relative and absolute humidity in Compost piles by differential pectroscopy using Tuneable diode lasers

    The composting of biological waste is an important step towards the establishment of closed cycles of matter. A constantly high quality of the compost is, however, of utmost importance for the deliberate re-introduction of compost into the environment. The quality of the compost produced is determined by a very complex biological process during which the organic wastes are converted with the aid ...


    By ORBIT e.V.

  • The Use of Oxidation-Reduction Potential as a Means of Controlling Effluent Ammonia Concentration in an Extended Aeration Activated Sludge System

    ABSTRACTThis study developed a strategy to control effluent ammonia from an activated sludge system, using oxidation-reduction potential. By controlling effluent ammonia concentrations, disinfection of treated wastewater is more cost effectively achieved by chloramination rather than break-point chlorination. The system under consideration was an extended aeration oxidation ditch. The study takes ...

  • Rendering facility case study

    The Problem: The Rendering Facility had experienced a catastrophic failure of an RBC system due a rotating assembly bearing and shaft failure. As a result, the existing lagoons became overloaded with ammonia from the anaerobic digestion process. The Solution: BioprocessH2O was selected to provide a bioFAS Moving Bed Biofilm ...


    By BioprocessH2O

  • Case study - DO control maximizes oxidation ditch treatment efficiency

    Process control is key to maximizing wastewater treatment efficiency while minimizing operating costs. Implementing the right process control system in conjunction with the right equipment can save money on electrical costs and equipment maintenance. The wastewater plant for the city of Dawson, MN, uses a  ...

  • Dairy Crest – Dairy Effluent Treatment Case Study and Partech Water Instruments

    In order to comply with environmental regulations, the food and beverage industry relies heavily on constant monitoring and control of wastewater and effluent, before discharge from the plant. Additionally, if process plants fail to be vigilant when it comes to monitoring all areas of waste treatment, the results can be unsuccessful. Partech’s water instruments are ...


    By Partech (Electronics) Ltd.

  • Efficient Waste Water Treatment

    Clean drinking water is an essential need of mankind. Often surface water like rivers or lakes is used as drinking water source. To prevent these resources from pollution the effective treatment of waste water is a must. For example in China 75% of discharged waste water is coming from pulp and paper, textile and dyeing industries. To run a waste water treatment plant in the most efficient way ...


    By J.V. Niebergall CDH

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