Improvement of oxygen transfer capacity by migration of oxygen defects formed in CuxMg1−xFeyTi2−yOz particles

2019 ◽  
Vol 76 ◽  
pp. 355-365 ◽  
Author(s):  
Namgyu Son ◽  
Jeong Yeon Do ◽  
No-Kuk Park ◽  
Si Ok Ryu ◽  
Ui Sik Kim ◽  
...  
Keyword(s):  
Oxygen Transfer ◽  
Oxygen Defects ◽  
Oxygen Transfer Capacity

Study of a Non-Conventional Aeration System

1987 ◽  
Vol 19 (5-6) ◽  
pp. 869-876
Author(s):  
L. Raschid-Sally ◽  
M. Roustan ◽  
H. Roques ◽  
G. M. Faup
Keyword(s):  
Oxygen Transfer ◽  
Peclet Number ◽  
Péclet Number ◽  
Theoretical Approaches ◽  
Aeration System ◽  
Circulation Velocity ◽  
The Mean ◽  
Oxygen Transfer Capacity ◽  
Mean Circulation ◽  
Conventional Systems

A non-conventional aeration system for oxidation ditches using jets has been developed. The principle of this system is based on the separation of the 2 actions: aeration and circulation. It was concluded that the flow of the liquid in the channel can be successfully modelled using various theoretical approaches. The mean circulation velocity VC, the power dissipated P, and the Peclet number Pe are the 3 important parameters governing the circulation. The oxygen transfer capacity of the system has been studied and compares favourably with that of conventional systems. The advantage of such systems over conventional ones has been discussed.

scholarly journals Oxygen Transfer Capacity as a Measure of Water Aeration by Floating Reed Plants: Initial Laboratory Studies

Processes ◽  
2020 ◽  
Vol 8 (10) ◽  
pp. 1270
Author(s):  
Antonio Albuquerque ◽  
Peter Randerson ◽  
Andrzej Białowiec
Keyword(s):  
Oxygen Transfer ◽  
Laboratory Experiments ◽  
Aquatic Plant ◽  
Dry Mass ◽  
Ammonia Nitrogen ◽  
Subsurface Environment ◽  
Floating Vegetation ◽  
Reed Plants ◽  
The Individual ◽  
Oxygen Transfer Capacity

Reed-Phragmites australis (Cav.) Trin. ex Steud, an aquatic plant, commonly used in constructed wetlands for wastewater treatment, supplies oxygen into the subsurface environment. Reed may be used as a ‘green machine’ in the form of a floating vegetation cover with many applications: wastewater lagoons, manure lagoons or sewage sludge lagoons. An important measure of the performance of the plant system is the oxygen transfer capacity (OTC). Accurate prediction of the OTC in relation to reed biomass would be crucial in modelling its influence on organic matter degradation and ammonia–nitrogen oxygenation in such lagoons. Laboratory experiments aiming to determine OTC and its dependence on reed biomass were carried out. Eight plants with a total dry mass ranging from approximately 3 to 7 g were tested. Mean OTC was determined per plant: 0.18 ± 0.21 (g O2·m−3·h−1·plant−1), with respect to leaves-and-stem dry mass (dlsm): 44.91 ± 35.21 (g O2·m−3·h−1·g dlsm−1), and to total dry mass (dtm): 33.25 ± 27.97 (g O2·m−3·h−1·g dtm−1). In relation to the relatively small root dry mass (drm), the OTC value was 136.02 ± 147.19 (g O2·m−3·h−1·g drm−1). Measured OTC values varied widely between the individual plants (variation coefficient 115%), in accordance with their differing size. Oxygenation performance was greatest in the reed plants with larger above ground dry mass (>4 g dlsm), but no influence of the root dry mass on the OTC rate was found.

Analysis of Oxygen Transfer and Dissolved Oxygen Concentration Measurement Tests in a Wastewater Treatment Plant

2014 ◽  
Vol 656 ◽  
pp. 486-494
Author(s):  
Marius Daniel Roman ◽  
Raluca Andreea Felseghi
Keyword(s):  
Dissolved Oxygen ◽  
Oxygen Concentration ◽  
Oxygen Transfer ◽  
Treatment Plant ◽  
Dissolved Oxygen Concentration ◽  
Coverage Area ◽  
Type Size ◽  
Oxygen Efficiency ◽  
Oxygen Transfer Capacity ◽  
Tank Geometry

The efficiency of oxygen transfer depends on many factors including the type, size and shape of diffusers and the tank geometry. In this paper, the effect of the depth of water in the tank and the extension of coverage area of diffusers on each of oxygen transfer capacity, efficiency and dissolved oxygen concentration is tested. Experimental procedure is adopted to evaluate the effect of dissolved oxygen concentration. The results of the case study showed that, both the depth of water and the extent of coverage area of diffuser had a significant effect on the tested parameters. The values of oxygen transfer capacity was 76,7 kg O2/h and oxygen efficiency (without agitation): 5,3 kg O2/h, oxygen efficiency (with agitation): 4,2 kg O2/h.

scholarly journals The Oxygen Transfer Capacity of Submerged Plant Elodea densa in Wastewater Constructed Wetlands

Water ◽  
2019 ◽  
Vol 11 (3) ◽  
pp. 575 ◽  
Author(s):  
Andrzej Białowiec ◽  
Karolina Sobieraj ◽  
Grzegorz Pilarski ◽  
Piotr Manczarski
Keyword(s):  
Wastewater Treatment ◽  
Oxygen Concentration ◽  
Constructed Wetlands ◽  
Oxygen Transfer ◽  
Municipal Wastewater ◽  
Tap Water ◽  
Mass Unit ◽  
Elodea Densa ◽  
Before And After ◽  
Oxygen Transfer Capacity

There are insufficient data for the development of process design criteria for constructed wetlands systems based on submerged plants as a major treatment agent. The aim of the study was to evaluate the oxygen transfer capacity (OTC) of E. densa, in relation to wet plants’ mass (w.m.), and the influence of E. densa on the oxygen concentration and contaminants’ removal efficiency from municipal wastewater. The obtained oxygen concentration and temperature data allowed to calculate the OTC values (mg O2·L−1·h−1), which had been related to wet plants’ mass unit (mg O2·L−1·h−1·g w.m.−1). The efficiency of wastewater treatment was determined in relation to initial wastewater content in the mixture of wastewater and tap water (0%, 25%, 50%, and 100%) during 3 days of the experiment duration. The simulation of day and night conditions was done by artificial lighting. Before and after finishing the second experiment, the COD, Ntotal, and P-PO4 concentration were analyzed in wastewater solutions. The OTC ranged from 3.19 to 8.34 (mgO2·L−1·h−1·g w.m.−1), and the increase of OTC value was related to the increase of wet plant’s mass. The research showed that E. densa affected positively on the wastewater treatment efficiency, and the highest efficiency was achieved in 25% wastewater solution: 43.6% for COD, 52.9% for Ntotal, 14.9% for P-PO4.

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