Transferencia de oxígeno en agua anóxica utilizando un dispositivo de aireadores de rueda de paletas a bajas revoluciones

The reduction of dissolved oxygen (DO) in water is associated with the effect of climate change. The lack of oxygen in water bodies directly affects the biological species present in different shallow water bodies such as swamps and wetlands, as well as in aquaculture processes. An optimal value in the DO concentration favors the reproduction of these biological species present in both artificial and natural environments. For this, various equipment has been developed to favor the increase of DO in the water to acceptable values. However, some of these systems are expensive, energy inefficient, and noisy which generate adverse impacts in aquatic ecosystems due to perturbances in the water. This study measures the efficiency (KgO2·kWh-1) of introducing DO into the water using a paddle wheel aerator system at low RPMs destined for shallow bodies of water. Tests were performed on anoxic water samples using aerators with 6, 12, and 24 paddles at the laboratory level. By increasing the voltage (6, 9, and 12V), the RPMs applied to each device through a geared motor is also increased. The results show a higher DO transfer rate in the 1 and 5 mg of O2·L-1 range. The best configuration concerning energy consumption worked at low RPMs using the 6-paddle wheel aerator at 6V. This establishes that, in addition to the management of low revolutions, the use of a smaller number of wheels favors an increase in efficiency during the DO restoration process in shallow water bodies.

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Load of Aeromonas salmonicida in Swamp Water and it's Effect on Tilapia (Oreochromis mossambicus)

Journal of Bio-Science ◽

10.3329/jbs.v15i0.2158 ◽

1970 ◽

Vol 15 ◽

pp. 165-168 ◽

Cited By ~ 1

Author(s):

Habiba Khatun ◽

Rowshatul Afza ◽

M Iqbal Hossain ◽

M Afzal Hussain ◽

AR Khan ◽

...

Keyword(s):

Organic Matter ◽

Shallow Water ◽

Aquatic Ecosystems ◽

Oreochromis Mossambicus ◽

Aeromonas Salmonicida ◽

Water Bodies ◽

Fish Culture ◽

Unemployment Problem ◽

Lentic Water

Swamps are one of those types of lentic water bodies, which form links between terrestrial and aquatic ecosystems. Dehadrai and Tripathi (1976) have characterized these water bodies as waterlogged, shallow water areas with a loose peaty bottom, rich in decaying organic matter retaining water either periodically or shrinking or drying summer months. There are numerous water bodies, including swamps, present in Bangladesh. But all of these water bodies are not used for scientific fish culture. To meet the increasing protein demand and to solve the unemployment problem in Bangladesh, swamps should be used for fish culture scientifically. This may also be helpful to destroy the habitat of many biological vectors such as mosquitoes. doi: 10.3329/jbs.v15i0.2158 J. bio-sci. 15: 165-168, 2007

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On methodological approaches to the improvement of surface water bodies and target indicators of the natural waters’ quality

Transbaikal State University Journal ◽

10.21209/2227-9245-2021-27-1-6-14 ◽

2021 ◽

Vol 27 (1) ◽

pp. 6-14

Author(s):

V. Zaslonovsky ◽

◽

N. Sharapov ◽

M. Bosov ◽

◽

...

Keyword(s):

Water Quality ◽

Surface Water ◽

Natural Water ◽

Aquatic Ecosystems ◽

Natural Waters ◽

Water Bodies ◽

Surface Water Bodies ◽

Methodological Approaches ◽

Natural Water Bodies

The paper is devoted to the development of proposals concerning the improvement of surface water bodies and the appointment of target indicators of the natural waters’ quality. The paper considers a variety of problems of preserving, restoring and improving the quality of natural surface waters: from regional features of the formation of natural water composition, to differences in the requirements for the quality of water consumed. The object of the study is the qualitative indicators of the waters of natural water bodies, and the subject of the study is the methodological approaches to the normalization of these indicators. The purpose of the work is to identify the main shortcomings in the domestic system of rationing the quality of natural waters, and to form appropriate proposals. For this purpose, the following tasks were set and solved: to review the methodological approaches to assessing and rationing the quality of natural waters used in some foreign countries and in the Russian Federation, to identify the main causes and shortcomings; to make proposals for improving the current system of water quality rationing. The result of this work is the conclusions about the lack of impact of the strategy operating in Russia in the development of schemes of complex use and protection of water objects, standards of permissible impact on water bodies, the appointment of permissible discharge limits in terms of maintaining and improving the water quality of natural water bodies. The reasons that led to this are indicated. The necessity of taking into account, in addition to the physical and chemical composition, also hydrobiological parameters is shown. It is concluded that instead of fisheries management standards, environmental standards should serve as the basis for target indicators of water quality of natural water bodies, which determine the well-being of humans and the stable functioning of aquatic ecosystems, taking into account regional factors. Proposals were made to adjust the methodological approaches to the implementation of this strategy. According to the authors, these proposals will speed up the solution of the main objectives of the strategy – the ecological improvement of water bodies, the preservation of unique aquatic ecosystems and the environmentally safe development of territories that previously experienced relatively small anthropogenic impacts (Eastern Siberia and the Far East)

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Interactions between microbial degradation of sedimentary organic matter and lake hydrodynamics in shallow water bodies: insights from Lake Sarbsko (northern Poland)

Journal of Limnology ◽

10.4081/jlimnol.2011.293 ◽

2011 ◽

Vol 70 (2) ◽

pp. 293 ◽

Cited By ~ 12

Author(s):

Michał WOSZCZYK ◽

Achim BECHTEL ◽

Roman CIEŚLIŃSKI

Keyword(s):

Organic Matter ◽

Shallow Water ◽

Microbial Degradation ◽

Water Bodies ◽

Sedimentary Organic Matter ◽

Northern Poland ◽

Lake Hydrodynamics

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Ist Wasserbau auch eine Frage der Ästhetik? | Is hydraulic engineering a question of aesthetics?

Schweizerische Zeitschrift fur Forstwesen ◽

10.3188/szf.2008.0205 ◽

2008 ◽

Vol 159 (7) ◽

pp. 205-208

Author(s):

Gianni Paravicini

Keyword(s):

Open Water ◽

Hydraulic Engineering ◽

Water Bodies ◽

Ecological Value ◽

The Aesthetic ◽

Bodies Of Water

There is much extended literature about classic technical hydraulic engineering and about the revitalization of bodies of water. This article deals with a third component, which has received little attention by the engineers. The author pleads for more aesthetic in hydraulic engineering, in particular in populated areas where many people use the open water bodies for recreation. It is shown that more aesthetic in hydrologic engineering often also leads to an increased ecological value. With hydraulic constructions in the canton of Lueerne, possible creative elements for the aesthetic and ecological revaluation of the course of creeks are discussed.

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