PL
 |
EN
Preferencje help
Polish version English version Język
Widoczny [Schowaj] Abstrakt
Liczba wyników

Znaleziono wyników: 5

Liczba wyników na stronie
first rewind previous Strona / 1 next fast forward last
Wyniki wyszukiwania
help Sortuj według:

help Ogranicz wyniki do:
first rewind previous Strona / 1 next fast forward last
1
Content available Studying the Effect of Mineral Fertilizers on the Development of the Eutrophication Process in the Water Bodies
Kostenko Viktor, Tavrel Maryna, Bohomaz Olha, Kostenko Tetiana, Kostyrka Olesia, Zemlianskyi Oleh
Ecological Engineering & Environmental Technology
|
2023
|
Vol. 24, iss. 4
79--87
EN
The article is devoted to the disclosure of the effect on the vital activity of cyanobacteria by changes in the nutrients in the chemical composition of artificial aquatic biotopes. The research results allowed us to establish that the dissolution of complex mineral fertilizer (nitrogen, phosphorus and potassium) in the range of up to 10 g/L contributes to the active development of cyanobacteria, which is accompanied by complete binding of mineral additives and absorption of oxygen. The addition of fertilizers in the amount of more than 1 g/L contributes to a sharp increase in the growth rate of the cyanobacteria population, which provokes the conditions for the blooming of the solutions. Enrichment of the nutritive base of biotopes ensures rapid growth of biocenosis and accelerated consumption of dissolved substances. The recorded average absorption rate of phosphorus reached more than 17 g/(L·day), and nitrogen – 30 g/(L·day). The formation of sediment and foam in the test vessels was associated with the depletion of nutrients and the death of hydrobionts. This phenomenon can serve as an indicator of oxygen decrease in the water. The results of the experiment confirmed the ability of cyanobacteria to transform nitrogen and phosphorus dissolved in water into bound organic forms with high intensity. This opens up the prospect of creating biological methods and means of wastewater demineralization.
2
Content available Increasing the Efficiency and Environmental Friendliness of Fire Resistance Assessment Tools for Load-Bearing Reinforced Concrete Building Structures
Nuianzin Oleksandr, Pozdieiev Serhii, Sidnei Stanislav, Kostenko Tetiana, Borysova Anna, Samchenko Taras
Ecological Engineering & Environmental Technology
|
2023
|
Vol. 24, iss. 4
138--146
EN
In this work, it is substantiated that it is possible to create a fire installation with parameters that will ensure higher environmental friendliness of the tests compared to large-sized furnaces. At the same time, its configuration will be universal, compact and capable of high reproducibility of experimental results. A full factorial experiment was conducted. According to its results, the parameters of the furnace chamber, which most significantly affect the reproducibility of the results, were determined. This are the volume of the chamber, the distance from the burners to the surface of the examined fragment of the load-bearing reinforced concrete building structure, and the height at which the opening for the exit of combustion products is located. Adequacy of operation of the designed installation was verified by the computer simulation method. Natural gas was used as fuel. On the basis of the received data, a sketch of the installation was created for conducting the experimental part of evaluating the fire resistance of load-bearing reinforced concrete building structures under the influence of the standard fire temperature regime. It can ensure a high degree of reproducibility of the test results.
3
Content available Recirculating Airlift for Aeration of Shallow Water Bodies
Tavrel Maryna, Kostenko Viktor, Bohomaz Olha, Kostenko Tetiana, Zemlianskyi Oleh, Pidhornyy Mykola
Ecological Engineering & Environmental Technology
|
2022
|
Vol. 23, iss. 5
177-187
EN
The article is devoted to solving the issue of ensuring the efficient operation of aeration equipment in the conditions of shallow water bodies with an average depth of only a few meters. The article offers a technical solution for reducing the size of airlift aerators and increasing their performance by creating a recirculation movement of water inside the unit. With the help of a laboratory model, it was established that the dynamics of oxygenation of water in the pool with the help of a recirculating airlift is subject to a logarithmic dependence on the size of the flow regulator. It was possible to increase the oxygen concentration in the pool by 2.6 times within three hours as part of the simulation. The rate of water oxygenation was much higher than for a conventional airlift of the same size. The offered cost-efficient aeration unit, which uses wind flow as an energy source, can be used for fish farms and other applications.
4
Content available Experimental Testing of Water Body Aeration Airlift Technology
Kostenko Viktor, Tavrel Maryna, Bohomaz Olha, Zavialova Olena, Kostenko Tetiana, Myhalenko Kostiantyn, Kostyrka Olesia
Ecological Engineering & Environmental Technology
|
2022
|
Vol. 23, iss. 3
184--192
EN
The article is devoted to substantiation of parameters of water body aeration technology at high, as well as low, air temperatures. As a result of studies, the design of the water aerator based on a two-stage airlift has been improved. A study of its physical model has been conducted. The cost indicators of the set-up and its components have been obtained. It has been established that at various design parameters, the proposed scheme of operation allows to oxygenate water more effectively when compared to conventional design. A new type of water aerator based on two-stage airlift has been proposed. The linear dependence of the dynamics of the aerator flow rate on the supply of compressed air by the compressor, as well as the logarithmic dependence regarding the water oxygenation have been established. The indicator of effective rate, which allows for evaluating efficiency of water body oxygenation has been substantiated. The study results open the possibility of using an aerator with improved design to prevent eutrophication of water in open water and industrial reservoirs, e.g. in construction.
5
Content available Pilot Tests of a Hybrid Solar Installation
Kostenko Viktor, Shkrylova Svitlana, Zavialova Olena, Kostenko Tetiana, Kostyrka Olesia, Rotar Vasyl
Ecological Engineering & Environmental Technology
|
2021
|
Vol. 22, iss. 6
122--130
EN
The article is devoted to the study of the efficiency of the structural elements of the solar collector in cloudy conditions with the stabilization of heat transfer due to the use of terrestrial radiation. The study involves experimental verification of theoretically obtained assumptions about the use of terrestrial radiation to improve the efficiency of the solar installation. Proposed a hybrid version of a solar installation using solar and terrestrial radiation. Based on the results of laboratory and field experimental tests, the efficiency of the offered hybrid installation is confirmed, positive results from short-term compensations of decrease in solar irradiation, e.g., due to clouds, are received. In addition to the known characteristics of heat collectors, for a hybrid installation, such a design parameter as the ratio of the heat capacity of the accumulator and the collector seems to be essential. The increase in the indicator characterizes the increase in the time of effective operation in the presence of clouds. The tests showed a significant impact on the operation of the installation of external factors such as the position of the Sun, ambient temperature, wind speed, etc. This will be taken into account in the further justification of the design of the hybrid installation and its parameters.
first rewind previous Strona / 1 next fast forward last
JavaScript jest wyłączony w Twojej przeglądarce internetowej. Włącz go, a następnie odśwież stronę, aby móc w pełni z niej korzystać.