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Wyświetlanie 1-13 z 13
Tytuł:
Productivity of Cotton in Association with Food Crops in Soil without Nutritional Assistances
Autorzy:
Montero-Cedeño, Silvia Lorena
Cañarte-Bermúdez, Ernesto Gonzalo
Navarrete-Cedeño, Jose Bernardo
Powiązania:
https://bibliotekanauki.pl/articles/24201742.pdf
Data publikacji:
2023
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
competence
gossypium
land equivalent ratio
productivity
Opis:
Intercropped systems have agro-ecological and socioeconomic advantages over monocultures. Cotton is used in systems associated with food crops as an option to increase sustainability in family farming. The objective of this research was to evaluate the productivity of cotton in association with food crops, without using any nutritional assistance in the soil. This study was conducted on the rainy season of 2020 in Manabí-Ecuador. Six treatments were performed: four treatments related with the association of cotton with peanut, cowpea bean, field corn, and sweet corn; and two treatments with cotton monoculture (with and without soil fertilization). Agronomic, productive, and phytosanitary variables were evaluated in 60 m2 experimental plots. A randomized complete block design with four replications was used. The results determined that cotton yield in the association with peanut was significantly equal to the monoculture with and without fertilization. In the intercropped food crops, there was a reduction in production in relation to the monocultures. However, it was the peanut in association with cotton with the lowest reduction, in addition to presenting the best Land Equivalence Ratio (1.71) and the best Marginal Rate of Return (120.56%), which suggests that this association is a viable alternative and easy to adopt by the small cotton producer.
Źródło:
Journal of Ecological Engineering; 2023, 24, 6; 75--85
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Impact of a Used Stabiliser on the California Bearing Ratio of the Clayey-Sandy Silt
Autorzy:
Kamińska, K.
Cholewa, M.
Moskwik, K.
Powiązania:
https://bibliotekanauki.pl/articles/952365.pdf
Data publikacji:
2017
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
stabiliser
California Bearing Ratio
clayey-sandy silt
Opis:
The paper aimed at the determination of the California Bearing Ratio of a stabilised and unstabilised fine-grained mineral soil. A clayey-sandy silt with the addition of 3, 6 and 10% of road stabilisers Solidex and Solidex A was used for the tests. The tests were carried out in the press Tritech 50 at the loading of 22 and 44 N. The stabilised samples were subjected to 7-days treatment, whereas unstabilised 4-days treatment. Stabilization with the applied road binders brought positive effects, there occurred a significant improvement in the mechanical properties of the clayey-sandy silt. The better binder, which significantly increased the value of the CBR ratio, was Solidex A. The use of hydraulic binders is of a great importance in road building, because their addition improves the mechanical properties of weaker mineral soils.
Źródło:
Journal of Ecological Engineering; 2017, 18, 1; 154-158
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Features of Heavy Metals Accumulation in Bottom Sediments of the Southern Bug Hydroecosystem
Autorzy:
Mitryasova, Olena
Koszelnik, Piotr
Gruca-Rokosz, Renata
Smirnov, Victor
Smirnova, Svitlana
Bezsonov, Yevgen
Zdeb, Monika
Ziembowicz, Sabina
Powiązania:
https://bibliotekanauki.pl/articles/124229.pdf
Data publikacji:
2020
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
heavy metals
hydroecosystem
bottom sediments
concentration ratio
Opis:
The performed studies allowed determining the peculiarities of heavy metals accumulation in the sediments, as well as the nature of their distribution in the hydroecosystem Southern Bug (Ukraine). Geochemical anomalies are formed in the zones of influence of industrial and urban agglomerations. Technogenic pollutions of bottom sediments with heavy metals affects the qualitative state of the water environment and can cause cumulative toxicosis on the hydrobiont population in the zones of geochemical anomalies formation, namely in the area of influence of the Nova Odessa and Mykolaiv cities. The mechanism of the cumulative toxicosis emergence is accompanied by chronic effects of low concentrations on hydrobionts with an excess of permissible fluctuations on a regional background, which ultimately contributes to the development of intoxication.
Źródło:
Journal of Ecological Engineering; 2020, 21, 3; 51-60
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Characteristics of Char from Low-Rank Coal Gasification
Autorzy:
Asof, Marwan
Arita, Susila
Andalia, Winny
Powiązania:
https://bibliotekanauki.pl/articles/24201706.pdf
Data publikacji:
2023
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
low-grade coal
charcoal
fuel ratio
gasification
Opis:
The coal gasification process in this study aimed to increase the quality of low-rank coal (LRC) from lignite type to coal with semi-anthracite and anthracite grades with higher fixed carbon values. The gasification process was carried out at temperatures between 700-900 °C. In the initial stages of the study, the relationship between the increase in gasification temperature with the mass of coal and the gasification process time was investigated. The proximate and ultimate analysis was carried out to determine the characteristics of the raw materials used and the coal char produced from combustion. The analysis results are used to calculate the fuel ratio, where the fuel ratio is a parameter to determine the grade of coal. In addition, an SEM-spot EDS analysis was carried out on the gasified coal solids to ensure the fixed carbon content produced from the above process. The results showed that the gasification process could raise the grade of LRC into char products with semi-anthracite to anthracite, where the fuel ratio reached 10.84. From the product analysis results, the LRC coal gasification results using SEM-EDS showed that carbon reached 98.58%. The remaining inorganic elements in the product are less than 1.5%, such as Al, Si and K.
Źródło:
Journal of Ecological Engineering; 2023, 24, 4; 78--84
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of Biodegradation Speed and Biodegradability of Polyethylene and Manihot Esculenta Starch Blends
Autorzy:
Abioye, Abiodun A.
Obuekwe, Chukwunonso
Fasanmi, Oluwatosin
Oluwadare, Oreofe
Abioye, Oluwabunmi P.
Afolalu, Sunday A.
Akinlabi, Stephen A.
Bolu, Christian A.
Powiązania:
https://bibliotekanauki.pl/articles/123576.pdf
Data publikacji:
2019
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
degradation rate
degradation ratio
biodegradable
polymer
manihot esculenta
Opis:
Over 350 million tons of conventional plastics are currently produced from petroleum per year and this amount is expected to rise exponentially in the near future. Proper disposal of these products has caused a great problem for the waste management industry and as a result, there is a significant negative impact on the environment. As a matter of fact, in order to reduce the environmental impact of plastics, some products obtained from agriculture (like starch) are used as polymer blend with synthetic plastics. This study shows that Manihot esculenta can be blended with polyethylene to form a partially degradable polymer. The processing conditions and sample formulations are shown to significantly affect the structure of the polymer which has a concomitant effect upon the degradation ratio as well as the degradation rate. Six samples were produced by varying composition of the blend between Low-density Polyethylene and Manihot esculenta using glycerol and water as plasticiser. These samples were buried in soil and the degradation ratios and rates were studied within a period of 28 days. The results showed that these produced biopolymers are environmentally compatible and bio-degradable. The rate of biodegradation in soil of these biopolymer samples varied largely. The polymer blend with 80% LDPE (20 CaS) by weight had the most regular weight loss over the period of the study. Under the conditions the study was carried out, polymer blend 20 CaS also had the steadiest rate of degradation. Hence, 80% LDPE (wt.%) blended with Manihot esculenta starch is the optimal ratio with regard to the degradability of biopolymer in sandy-loam soil.
Źródło:
Journal of Ecological Engineering; 2019, 20, 2; 65-72
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Efficiency Analysis of the Generation of Energy in a Biogas CHP System and its Management in a Waste Landfill – Case Study
Autorzy:
Ciuła, Józef
Generowicz, Agnieszka
Gaska, Krzysztof
Gronba-Chyła, Anna
Powiązania:
https://bibliotekanauki.pl/articles/2173248.pdf
Data publikacji:
2022
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
cogeneration
energy efficiency
energy ratio
landfill gas
municipal waste
renewable energy
Opis:
As a waste neutralization facility, the landfill is a kind of bioreactor producing landfill gas or (LFG) - biogas, which should be captured and neutralised for environmental reasons. One of the ways of its utilisation is the combined production of heat and electrical energy in combined heat and power (CHP) cogeneration systems. For that purpose, the assessment of the energy efficiency of a cogeneration unit was undertaken in this work on the basis of the unit performance over the last 5 years. The analysis of the CHP system energy performance demonstrated that the ratios range at the lower limits for units up to 0.5 MW. The lower efficiency of fuel chemical conversion in the CHP plant (0.70) stems from the failure to use the rated thermal and electrical power fully (74.2%), which is caused by the insufficient stream of biogas collected from the landfill (161.46 m3∙h-1). The analysis of the generated energy usage, particularly in terms of heat, has shown a surplus which is not used and therefore is a loss. The proposed solutions in this area should optimize the use of heat generated from the renewable source, i.e. landfill biogas.
Źródło:
Journal of Ecological Engineering; 2022, 23, 7; 143--156
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Changes of Nitrogen and Organic Compound During Co-Composting of Disposable Diaper and Vegetable Wastes on Aerobic Process
Autorzy:
Pandebesie, Ellina S.
Warmadewanthi, Idaa
Wilujeng, Susi Agustina
Simamora, Minar Saraswati
Powiązania:
https://bibliotekanauki.pl/articles/2086412.pdf
Data publikacji:
2022
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
aerobic
C/N ratio
composting
diaper waste
vegetable waste
volatile solid
Opis:
The use of disposable diapers is increasing every year, increasing generated diaper wastes every year. In Surabaya, diaper wastes have become an important issue when they are not treated properly. These diaper wastes will end up in water bodies and cause pollution. One of the technologies that can be used to treat diaper wastes is composting. Disposable diaper wastes consist of high lignocellulose and C content. It is necessary to mix diaper wastes and other wastes with high N content as a co-substrate, so that the optimum C/N ratio of composting can be achieved. In this research, vegetables wastes were used. The Objective of the research was to determine the effect of vegetable wastes adding as a co-substrate in composting of disposable diapers and volatile solid (VS), C-organic, and Total Nitrogen (TN) content changed during the composting process. The research was carried out with three variables mixtures of diaper wastes and vegetable wastes. Two control consist of 100% diaper wastes and 100% vegetables wastes. The Total weight of raw materials was 10 kg for each reactor. The composting process is carried out aerobically with a composting time of 60 days. The results showed that vegetable wastes have the potential to be used as a co-substrate for diaper wastes. The content of C-organic, VS and total nitrogen decreased. All of the parameters include C/N ratio meet the Indonesian Standard of compost.
Źródło:
Journal of Ecological Engineering; 2022, 23, 4; 228--234
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental Studies on Hydrothermal Treatment of Municipal Solid Waste for Solid Fuel Production
Autorzy:
Djaenudin, -
Permana, Dani
Ependi, Mahyar
Putra, Herlian Eriska
Powiązania:
https://bibliotekanauki.pl/articles/1955568.pdf
Data publikacji:
2021
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
holding time
hydrochar
hydrothermal treatment
municipal solid waste
feed to water ratio
Opis:
Using the Hydrothermal process to reduce the volume of the Municipal Solid Waste (MSW) which is mostly organic component and to utilize the solid powder resulted as coal-like solid fuel will contribute not only to solving the MSW problem but also reducing the coal consumption in the power plant. In this study, the hydrothermal processes were conducted using a laboratory scale apparatus with MSW components as the samples. The process parameters comprised temperature, solid load, and holding time. Four components were used as representative of organics and plastics in the municipal solid waste. In this study, the experiments were done performed at various temperatures, 180 °C, 200 °C, and 220 °C inside an experimental autoclave. The results of the experiments show that the process time, the water amount and the temperature which are used in hydrothermal process, affect the proximate and ultimate compositions. The moisture and fixed carbon content decrease and the volatile matter increases, so that the calorific value of MSW increases. On the basis of the experiments, the optimum hydrothermal process parameters are feed to water ratio of 1/1 (250 g/250 ml), temperature of 180 °C, and holding time of 90 min. It also can be concluded that the hydrothermal process can be applied to MSW to produce solid fuel.
Źródło:
Journal of Ecological Engineering; 2021, 22, 9; 208-215
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Theoretical Foundations and Technological Capabilities of Hydrocarbonyl Process while Recovering Copper from Technogenic Wastes
Autorzy:
Fedoseev, I. V.
Barkan, M. S.
Kornev, A. B.
Danilov, A. S.
Powiązania:
https://bibliotekanauki.pl/articles/123296.pdf
Data publikacji:
2018
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
polymetallic sulphide ores
high purity copper
hydrocarbonyl process
reduction ratio
producer gas
Opis:
Secondary processing of waste from metallurgical and other industries becomes an urgent issue in the face of increasing anthropogenic pressure and a shortage of sources of materials. The paper shows the results of chemical and technological studies of processes, executing in the Cu(II) – Cu(I) – Cl- – CO – H2О system. The processing technology of copper-bearing intermediate products multicomponent leaching solutions, permitting high purity copper production at the least economic cost, is proposed.
Źródło:
Journal of Ecological Engineering; 2018, 19, 5; 33-37
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Andean Grassland Species: Net Aerial Primary Productivity, Density, Ecomorphological Indices, and Soil Characteristics
Autorzy:
Yaranga, Raúl
Van Vuure, Aart
Fuentes, Anibal
Fuentes, Abner
Maraví, Karol
Román, Mariela
Cáceres, Drussi
Fuentes, Carlos A.
Powiązania:
https://bibliotekanauki.pl/articles/2027799.pdf
Data publikacji:
2021
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
Andean grassland
aerial phytomass productivity
Andean grassland species
plant density
plant-soil ratio
Opis:
The tall grass vegetation in the Andean grassland ecosystems covers the largest area compared to other types of vegetation such as Puna grass, wetland and others. The grasslands are frequently set on fire by livestock farmer, seriously affecting the ecosystem. One way to mitigate this problem is to use these species as a source of plant fibre, which can be economically useful to the interests of the livestock family without affecting the ecosystem. To advance in this approach, it is necessary to know the functional characteristics of the plants; therefore, we evaluated the aerial primary productivity, plant density per m2, basal cover, aerial cover and leaf height, whose data were analysed using the generalised linear mixed model and the correlation between these variables with the physical-chemical characteristics of the soil, by means of principal component analysis and canonical correlation, in seven species of grassland and seven control plots, located between 3860 and 4333 metres above sea level. The results showed significant differences for p=0.001 between species, and between plots, and a canonical correlation grouped in two clusters that showed the differentiated importance of soil elements with the phytomass produced.
Źródło:
Journal of Ecological Engineering; 2021, 22, 10; 163-175
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Emission of Carbon Monoxide and Nitrogen Oxides from Boilers Supplied by a Pellet under the Influence of Changes in the Air-Fuel Equivalence Ratio
Autorzy:
Ciupek, Bartosz
Judt, Wojciech
Urbaniak, Rafał
Kłosowiak, Robert
Powiązania:
https://bibliotekanauki.pl/articles/124554.pdf
Data publikacji:
2019
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
heating boiler
wood pellet
air-fuel equivalence ratio
carbon monoxide
CO
nitrogen oxides
NOx
Opis:
The aim of the experimental research was to determine the impact of changes in the air-fuel equivalence ratio during the combustion of wood pellet in the boiler on the CO and NOx emissions. In order to realize the tests, 10 kW wood pellet boiler equipped with a dedicated wood pellet burner was employed. On the basis of the research, the relationship between the level of harmful substances emitted under the influence of changes in the air-fuel equivalence ratio was presented. The obtained results and conclusions based on them can be used to optimize the design of heating devices fed by wood pellets.
Źródło:
Journal of Ecological Engineering; 2019, 20, 10; 34-38
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimization of Particle Size and Ramie Fiber Ratio on Hybrid Bio Panel Production from Oil Palm Trunk as Thermal Insulation Materials
Autorzy:
Mawardi, Indra
Nurdin
Fakhriza
Rizal, Samsul
Aprilia, Sri
Faisal, Muhammad
Jaya, Ramadhansyah Putra
Powiązania:
https://bibliotekanauki.pl/articles/2202371.pdf
Data publikacji:
2023
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
oil palm trunk
hybrid bio panel
thermal insulation
particle size
ramie fibre ratio
RSM
response surface methodology
Opis:
The abundant availability of waste oil palm trunks is one of the potential fibers for new thermal insulation materials. While focusing on the manufacturing of thermal insulation materials, the main points to be considered are particle size, reinforcement fiber ratio, and press durations, besides binders type and temperature. This study aimed to optimize the manufacturing process of hybrid bio panels based on oil palm trunks as thermal insulation material. The response surface methodology (RSM), with a Box-Behnken Design (BBD), was used to model and optimize the manufacturing process variables. A total of 17 hybrid bio panels were in operation and the independent variables used were particle size, ramie ratio, and press duration. The dependent variables were water absorption, thickness swelling, MOR, and thermal conductivity. The hybrid bio panel obtained under the optimum conditions was characterized by thermogravimetric analysis to observe thermal stability. On the basis of analysis of variance and the contour plot, it was discovered that the interaction between particle size and ramie fiber ratio was a significant variable to optimize hybrid bio panel manufacture. The thermal resistance and modulus of rupture of hybrid bio panels also improved with higher particle size and ramie fiber ratio. The optimum manufacturing process was obtained at OPT particle size of 0.248 mm, ramie fiber ratio of 19.775, and press duration of 25 min. This condition produces a thermal conductivity of 0.079 W/mK, modulus of rupture of 17.702 MPa, water absorption of 54.428%, and thickness swelling of 21.974%. In addition, the hybrid bio panel resulted in thermal stability of 341 °C.
Źródło:
Journal of Ecological Engineering; 2023, 24, 2; 39--49
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Rainwater Management Solutions and their Impact on Shaping Inner City Areas Undergoing Transformation (Case Study of the ZAC Clichy-Batignolles Area in Paris)
Autorzy:
Jóźwik, Renata
Powiązania:
https://bibliotekanauki.pl/articles/125174.pdf
Data publikacji:
2020
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
new urban development
Sustainable Urban Water Management
rainwater harvesting
wet ditch
biotope reservoir
runoff ratio
degraded areas
Clichy-Batignolles area
Opis:
Proper management of rainwater in cities has a significant impact on improving the environmental conditions: the microclimate of a city by regulating the water cycle and reducing heat islands; developing of biodiversity; increasing health and well-being of residents. The aim of the article was to present the possibilities of improving the environmental conditions in compact urban development areas – those that additionally contribute to the shaping of architecture, and thus combine the ecological, functional, and aesthetic benefits. The article draws attention to the synergy of climate change and the new way of developing urban areas, which was presented on the example of specific solutions functioning on the transformed urban area: Clichy-Batignolles in central Paris – recognized as a model for environmental solutions, labelled Éco-Quartier. The mentioned conditions and solutions were related to the possibility of shaping urban form, with the obligation to discharge some or all of the rainwater on the building plot. On the basis of the calculations made for the runoff ratio in individual quarters, it was found that it is possible to maintain a compact urban structure and effectively manage rain water provided that appropriate engineering and urban solutions are applied. These solutions can have an architectural value. The conclusions from the analyses can be used to formulate guidelines for other European cities, which are increasingly faced with the problem of water scarcity and uncontrolled flooding.
Źródło:
Journal of Ecological Engineering; 2020, 21, 3; 209-219
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-13 z 13

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