scholarly journals Study on the Balance of Oxygen in Supply and Demand in Wastewater Treatment Plant

2021 ◽  
Author(s):  
Jingbing Zhang ◽  
Yuting Shao ◽  
Hongchen Wang ◽  
Guo-hua Liu ◽  
Lu Qi ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Oxygen Uptake ◽  
Uptake Rate ◽  
Oxygen Uptake Rate ◽  
Treatment System ◽  
Quality Analysis ◽  
Stable Operation ◽  
Aeration Tank ◽  
Oxygen Balance ◽  
Operation Efficiency

Abstract In order to accurately evaluate the comprehensive operation efficiency of aerobic biological treatment system in wastewater treatment plants (WWTPs), the process state aeration performance tester and the specific oxygen uptake rate online monitoring device were used to measure the oxygenation performance and the activated sludge performance in aeration tank, and the comprehensive operation efficiency of aerobic tank was evaluated by combining physical-chemical indexes and water quality analysis of the treatment system. The results showed that the oxygen transfer efficiency (OTE) of aerators under process state are reduced by 13.07% and 14.48% respectively compared with that in clean water in the No.3-tank and No.6-tank, and the aeration uniformity index (IAU) is 4.86 and 1.46 respectively. The oxygen uptake rate (OUR) in the third corridor decreased significantly, but dissolved oxygen (DO) was a high level. Oxygen in supply (Qs) was much greater than oxygen in demand (Cs), which have resulted a large waste of energy consumption. Finally, the subsection regulation strategy was proposed based on the principle of oxygen balance. The results of this study will not only help the WWTP to achieve energy-saving and consumption-reducing, but also stable operation.

Influence of Endogenous OUR Determination on the KLa$${K_L}a$$, Exogenous OUR, Total Oxygen Consumption and Heterotrophic Yield in a Completely Mixed Batch Reactor

2014 ◽  
Vol 12 (2) ◽  
pp. 695-704 ◽  
Author(s):  
R. Zamouche-Zerdazi ◽  
M. Bencheikh Lehocine ◽  
A.-H. Meniai
Keyword(s):  
Wastewater Treatment ◽  
Oxygen Consumption ◽  
Oxygen Uptake ◽  
Uptake Rate ◽  
Oxygen Uptake Rate ◽  
Batch Reactor ◽  
Total Oxygen ◽  
Biomass Activity ◽  
Biological Reaction ◽  
Global Nature

Abstract In wastewater treatment, waste removal and biomass activity are important processes which need to be monitored for a good process control. The difficulties in the interpretation of the total COD, BOD and VSS measurements encouraged the development of respirometric methods for assessing the kinetic constants. Respirometry is an important technique in assessing biological reaction in wastewater treatment. $${K_L}a$$, depends on endogenous oxygen uptake rate (OURend), is a key constant in evaluating respirogram-specific parameters. Generally, OURend is assumed constant in the dissolved oxygen equations. However, it is not the case. Consequently, this paper deals with the influence of OURend calculations region on $${K_L}a$$ determination, exogenous oxygen uptake rate (OURexo), total oxygen consumption and heterotrophic yield (YH). It was shown that the value of OURend and $${K_L}a$$ varied considerably, a maximum of 56%, depending on where to consider Cfin, on the oxygen concentration variation curve. Even though, the variation on OURend and $${K_L}a$$ is important its influence on Yo/x and YH is attenuated to 7.5% and 6%, respectively. This may be due to the local nature of the first parameters (OURend and $${K_L}a$$) and the global nature of the later ones. Moreover, this can be seen through the variation of the calculated amount of oxygen consumed (QThete) which is of the order 7.6%.

Application of a new model based on oxygen balance to determine the oxygen uptake rate in mammalian cell chemostat cultures

2016 ◽  
Vol 152 ◽  
pp. 586-590 ◽  
Author(s):  
Yandi Rigual-González ◽  
Lucía Gómez ◽  
Jonathan Núñez ◽  
Mauricio Vergara ◽  
Alvaro Díaz-Barrera ◽  
...  
Keyword(s):  
Oxygen Uptake ◽  
Mammalian Cell ◽  
Uptake Rate ◽  
Oxygen Uptake Rate ◽  
Oxygen Balance ◽  
New Model ◽  
Model Based ◽  
Chemostat Cultures

scholarly journals Multilevel Adaptive Control of Alternating Aeration Cycles in Wastewater Treatment to Improve Nitrogen and Phosphorous Removal and to Obtain Energy Saving

Water ◽  
2018 ◽  
Vol 11 (1) ◽  
pp. 60 ◽  
Author(s):  
Pedro Martín de la Vega ◽  
Miguel Jaramillo-Morán
Keyword(s):  
Organic Matter ◽  
Wastewater Treatment ◽  
Adaptive Control ◽  
Energy Consumption ◽  
Oxygen Uptake ◽  
Removal Efficiency ◽  
Working Conditions ◽  
Uptake Rate ◽  
Oxygen Uptake Rate ◽  
Phosphorous Removal

This work presents an adaptive control of the process of alternating aeration/non-aeration cycles for wastewater treatment. It is aimed at improving nitrogen and phosphorous removal efficiency and reducing energy consumption. It comprises two control levels. The first decides when to switch on and off aeration by comparing the Dissolved Oxygen (DO) and the Oxidation Reduction Potential (ORP) with two activation thresholds. The second, a supervisory control, continuously adapt their values by analyzing the working conditions of the reactor (organic matter and ammonium loads). These working conditions are described by four parameters obtained from the DO and ORP curves: Oxygen Uptake Rate (OUR), Oxygen Rise Average Slope (ORAS), ORParrow and Nitrate and Oxygen Uptake Rate (NOUR). It also adjusts the aeration system power to adapt it to those conditions. This adaptive control has been implemented in a laboratory scale prototype and its performance compared with that provided by another control with fixed thresholds and aeration power implemented in a similar prototype. The adaptive control clearly outperforms that without adaptation in nitrogen and phosphorous removal efficiency and requires lower energy consumption. Similar efficiencies were obtained for organic matter removal (higher than 90% in both cases).

Optimum aerobic volume control based on continuous in-line oxygen uptake monitoring

2003 ◽  
Vol 47 (11) ◽  
pp. 305-312 ◽  
Author(s):  
K. Svardal ◽  
S. Lindtner ◽  
S. Winkler
Keyword(s):  
Oxygen Uptake ◽  
Uptake Rate ◽  
Oxygen Uptake Rate ◽  
Air Flow ◽  
Volume Control ◽  
Ammonium Concentration ◽  
Aeration Tank ◽  
Low Oxygen ◽  
Control Concept ◽  
Line Oxygen

Dynamic adaptation of the aerated volume to changing load conditions is essential to maximise the nitrogen removal performance and to minimise energy consumption. A control strategy is presented which provides optimum aerobic volume control (OAV-control concept) based on continuous in-line oxygen uptake monitoring. For ammonium concentrations below 1 mg/l the oxygen uptake rate shows a strong and almost linear dependency on the ammonium concentration. Therefore, the oxygen uptake rate is an ideal indicator for the nitrification performance in activated sludge systems. The OAV-control concept provides dynamic variation of the minimum aerobic volume required for complete nitrification and therefore maximises the denitrification performance. In-line oxygen uptake monitoring is carried out by controlling the oxygen concentration in a continuous aerated zone of the aeration tank and measuring the total air flow to the aeration tank. The total air flow to the aeration tank is directly proportional to the current oxygen uptake rate and can therefore be used as an indicator for the required aerobic volume. The instrumentation requirements for installation of the OAV-control are relatively low, oxygen sensors in the aeration tank and an on-line air flow measurement are needed. This enables individual control of aeration tanks operated in parallel at low investment costs. The OAV-control concept is installed at the WWTP Linz-Asten (1 Mio PE) and shows very good results. Full scale results are presented.

Exposure to degraded coral habitat depresses oxygen uptake rate during exercise of a juvenile reef fish

Coral Reefs ◽  
2021 ◽  
Author(s):  
Adam T. Downie ◽  
Caroline M. Phelps ◽  
Rhondda Jones ◽  
Jodie L. Rummer ◽  
Douglas P. Chivers ◽  
...  
Keyword(s):  
Oxygen Uptake ◽  
Reef Fish ◽  
Uptake Rate ◽  
Oxygen Uptake Rate ◽  
Juvenile Reef Fish
Sign in / Sign up

Export Citation Format

Share Document