scholarly journals Long-lived steam-sterilizable membrane probes for dissolved oxygen measurement

1967 ◽  
Vol 9 (4) ◽  
pp. 635-639 ◽  
Author(s):  
John D. Bokkowski ◽  
Marvin J. Jhonson
Keyword(s):  
Dissolved Oxygen ◽  
Oxygen Measurement ◽  
Membrane Probes

scholarly journals The Influence of Optic and Polarographic Dissolved Oxygen Sensors Estimating the Volumetric Oxygen Mass Transfer Coefficient (KLa)

2016 ◽  
Vol 10 (8) ◽  
pp. 142 ◽  
Author(s):  
Gustavo Andrés Baquero-Rodríguez ◽  
Jaime A. Lara-Borrero
Keyword(s):  
Mass Transfer ◽  
Wastewater Treatment ◽  
Dissolved Oxygen ◽  
Transfer Coefficient ◽  
Mass Transfer Coefficient ◽  
Oxygen Transfer ◽  
Airflow Rate ◽  
Oxygen Probe ◽  
Aeration System ◽  
Oxygen Measurement

Aeration is usually the most energy intensive part of the wastewater treatment process. Optimizing the aeration system is essential for reducing energy costs. Field tests oriented to estimate parameters related to oxygen transfer are a common approach to compare aeration systems. The aim of this research is to assess the effect of dissolved oxygen probe lag on oxygen transfer parameter estimation. Experimental procedures regarding to process automation and control were applied to quantify dissolved oxygen probe lag. We have measured oxygen transfer in clean water, under a wide range of conditions (airflow rate, diffuser characteristics and diffuser density), with optic and polarographic sensors for dissolved oxygen measurement. The oxygen transfer was measured as per ASCE Standard procedures. Nonparametric statistical tests were used to compare the estimated volumetric mass transfer coefficient KLa with different sensors. According to the results, there is not significant influence of the probe lag (also known as time constant) or probe characteristics on the parameters used to assess oxygen transfer efficiency. This fact has great relevance in common practice of aerobic process for wastewater treatment because dissolved oxygen monitoring is used as an input for decision making related to the energy optimization in the aeration system. Findings from these tests contradict previous studies which claim that lag time in polarographic sensors for the dissolved oxygen measurement can bias estimate KLa.

Dissolved oxygen measurement with an improved amperometric cell

1986 ◽  
Vol 190 ◽  
pp. 275-279 ◽  
Author(s):  
Th.W. Rejda ◽  
J.D.N. Bunschoten ◽  
G.A.J. Kalis
Keyword(s):  
Dissolved Oxygen ◽  
Oxygen Measurement

Steam sterilizable probes for dissolved oxygen measurement

2000 ◽  
Vol 67 (6) ◽  
pp. 645-656 ◽  
Author(s):  
Marvin J. Johnson ◽  
John Borkowski ◽  
Curt Engblom
Keyword(s):  
Dissolved Oxygen ◽  
Oxygen Measurement

scholarly journals BIOSENSOR SYSTEM DESIGN FOR DISSOLVED OXYGEN MEASUREMENT USING CURRENT MIRROR CIRCUIT

2019 ◽  
Vol 4 (2) ◽  
pp. 89-96
Author(s):  
Lazuardi Umar ◽  
Rahmondia N. Setiadi ◽  
Arfianti ◽  
Tetty M. Linda
Keyword(s):  
Dissolved Oxygen ◽  
Power Supply ◽  
Measurement Range ◽  
Current Mirror ◽  
High Noise ◽  
Biosensor System ◽  
Oxygen Measurement ◽  
Current Value ◽  
A Current ◽  
Lower Noise

It has been designed a biosensor system using the current mirror circuit. Biosensor system usually implements an amperometric circuit such as a trans-impedance to measure the current value that flows in the solution due to the dissolved oxygen in it. The trans-impedance circuit causing rather high noise, besides that the power supply used must be bipolar; otherwise the measurement range would be narrower. In this paper, a current mirror circuit is used to convert the flowing current in the solution. The current mirror circuit has a lower noise level, besides the power supply needed is just unipolar, and the measurement range much wider. By utilizing this circuit, the biosensor measurement system can be optimized with its achieved advantages

scholarly journals The Dissolved Oxygen Sensor Design Based on Ultrasonic Self-Adaption and Self-Cleaning

Complexity ◽  
2020 ◽  
Vol 2020 ◽  
pp. 1-8
Author(s):  
Zhong Xiao ◽  
Jingtong Wang ◽  
Chen Yi ◽  
Zairong Wang ◽  
Liang Wang
Keyword(s):  
Service Life ◽  
Dissolved Oxygen ◽  
Oxygen Sensor ◽  
Simple Structure ◽  
Diffusion Rate ◽  
Accuracy Of Measurement ◽  
Oxygen Measurement ◽  
Software And Hardware ◽  
Cleaning Technology ◽  
Sensor Probe

Dissolved oxygen sensor is the key of dissolved oxygen measurement and it is usually implemented by electrochemical method, which measures dissolved oxygen content by the diffusion rate of molecular oxygen through film. However, the film on the electrochemical sensor probe is most likely to be blocked up by the waterborne contaminant, which may reduce the service life of the sensor and the indirect influence on the sensor’s current. This is caused by changes of water temperature, which may lead to the decline in the accuracy of the sensor’s output. This paper suggests a new method to implement the intelligent dissolved oxygen sensor. Our method mainly aims at ultrasonic automatic cleaning, automatic adjustment, and adaptation for the changes of temperature, which can not only regularly clean the dissolved oxygen sensor probe but also automatically calibrate the instruments based on the changes of temperature by combining software and hardware. The experiments show that the ultrasonic cleaning technology can not only increase the service life of the sensor by cleaning the film on the probe safely and effectively but also improve the accuracy of the sensor’s output. Our method also has the advantages of simple structure, high accuracy of measurement, long service life, convenience, and stability, which is suitable for application and popularization.

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