Treatment of Water Supplies by the Technique of Dynamic Aeration

Mostefa, Gafsi; Kettab, Ahmed

doi:10.1016/j.proeng.2012.01.1195

Cited by 7 publications

(2 citation statements)

References 6 publications

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“…However, not opening the lower gate in the dry season would most likely accentuate the decrease of dissolved oxygen in hypoxic and suboxic conditions and lower the redox potential-Eh, thereby increasing the release of metals from the sediments. In the absence of resuspension phenomena, whether natural or induced, the hypolimnion is a source of reduced chemical species from anoxic sediment (Mostefa and Ahmed 2012).…”

Section: Discussionmentioning

confidence: 99%

Spatial and Temporal Behavior of Soluble Manganese at the Sediment–Water Interface in the Riogrande II Reservoir in Colombia

2015

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The behavior of manganese (Mn) at the sediment-water interface in bodies of water such as lakes and reservoirs is dependent on physicochemical factors such as pH, redox potential-Eh, organic matter, specific conductance, and the presence of organic and inorganic complexes. These allow the mobilization of Mn from the sediment to the water column and promote its precipitation as Mn oxyhydroxide. For the Riogrande II reservoir in Colombia (2550 m), it was found that redox potential-Eh below 1350 mV is not appropriate for oxide stability. The availability and mobility of these oxides are more associated with organic complexation and desorption from sediments when the pH changes from neutral conditions to slightly acidic conditions (6.0). However, when the lower gates of the reservoir are opened during the dry season, the entry of oxygenated bottom currents most likely increases the dissolved oxygen (DO) and redox potential-Eh. Similarly, the increase in soluble Mn at the intake tower during the dry season is more associated with desorption than with reductive dissolution.The primary objective of this study is to determine the main physicochemical factors favoring Mn remobilization from sediment to the water column and its relation to the operating mechanisms of the intake water tower of the Riogrande II reservoir.One of the most notable results of this study is the observation that the operating mechanisms of the Riogrande II reservoir not only affect the type of water that is captured but also influence the geochemical processes at the bottom of the reservoir and in the sediment.The results of this study highlight the influence of hydraulic processes on surface water bodies as regards the dynamics of metal remobilization, the generation of pollution into the water column, and the increasing costs of treatment and purification in reservoirs in high mountain areas in tropical countries.

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Section: Discussionmentioning

confidence: 99%

Spatial and Temporal Behavior of Soluble Manganese at the Sediment–Water Interface in the Riogrande II Reservoir in Colombia

2015

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“…To promote a sustainable increase in oxygen concentration, this method should be combined with a reduction in nutrient levels. Mostefa and Ahmed [4] analysed the effectiveness of hypolimnetic oxygenation with the use of the "Tanytarsus" diffuser system in Lake Hallwil in Switzerland. In a study by Stigebrandt et al [5], the deep water of the anoxic By Fjord in Sweden was aerated with oxygen aspirated from the surface.…”

Section: Introductionmentioning

confidence: 99%

Effect of Rotational Speed of a Self-Aspirating Mixer on Oxygen Saturation in Water

Wróblewski

Skotnicka-Siepsiak

2020

Polish Maritime Research

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There are two categories of gas-liquid mixers: conventional and special-purpose. In theory, any conventional mixer can be applied to aerate a liquid, but fast-rotating devices are generally preferred. Special-purpose mixers (tubular, prismatic, cylindrical) have a hollow shaft, and operate by drawing gas from above the surface of the liquid and dispersing it inside the liquid. This process is referred to as aspirated aeration. In contrast, conventional mixers increase the pressure of the aspirated gas. Gas drawn from above the surface of the liquid flows through channels bored inside the shaft and the impeller, and is introduced to the liquid in this way. This article presents the results of an experiment investigating the aeration efficiency of a six-tube self-aspirating mixer at different rotational speeds. The experiment was conducted in a flow tank. The results indicate that self-aspirating mixers are effective devices for water aeration and mixing.

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Aquatic environmental assessment of Lake Balaton in the light of physical-chemical water parameters

Sebestyén

Németh

Juzsakova

et al. 2017

Environ Sci Pollut Res

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One of the issues of the Hungarian Water Management Strategy is the improvement and upgrading of the water of Lake Balaton. The Water Framework Directive (WFD) specifies and sets forth the achievement of the good ecological status. However, the assessment of the water quality of the lake as a complex system requires a comprehensive monitoring and evaluation procedure. Measurements were carried out around the Lake Balaton at ten different locations/sites and 13 physical-chemical parameters were monitored at each measurement site.For the interpretation of the water chemistry parameters the Aquatic Environmental Assessment (AEA) method devised by authors was used for the water body of the Lake Balaton. The AEA method can be used for all types of the water bodies since it is flexible and using individual weighting procedure for the water chemistry parameters comprehensive information can be obtain. The AEA method was compared with existing EIA methods according to a predefined criterion system and proved to be the most suitable tool for evaluating the environmental impacts in our study.On the basis of the results it can be concluded that the status of the quality of studied area on the Lake Balaton can be categorized as proper quality (from the outcome of the ten measurement sites this conclusion was reached at seven sites).

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Treatment of Water Supplies by the Technique of Dynamic Aeration

Cited by 7 publications

References 6 publications

Spatial and Temporal Behavior of Soluble Manganese at the Sediment–Water Interface in the Riogrande II Reservoir in Colombia

Spatial and Temporal Behavior of Soluble Manganese at the Sediment–Water Interface in the Riogrande II Reservoir in Colombia

Effect of Rotational Speed of a Self-Aspirating Mixer on Oxygen Saturation in Water

Aquatic environmental assessment of Lake Balaton in the light of physical-chemical water parameters

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