Wyniki wyszukiwania - BazTech

1

Flotation kinetic tracking of sand contaminated with hydrocarbons : image analysis of pulp color changes in time

Acuña Claudio, Humire José, Leiva Claudio

Physicochemical Problems of Mineral Processing

|

2023

|

Vol. 59, iss. 5

art. no. 176307

EN

Hydrocarbon contamination in the environment poses a significant challenge, and various control methods have been explored. Soil remediation by flotation has been proposed as an effective approach. This method involves the separation of hydrophobic compounds, such as soil hydrocarbons, by introducing air into a stirred reactor containing the soil pulp designated for remediation. Experiments were conducted using a 5 L Batch flotation cell to evaluate operating conditions. These experiments focused on obtaining flotation kinetics with different organic mixtures, including fine sands measuring under 150 μm. The experimental design encompassed airflow, hydrocarbon concentration, and surfactant dosage. The research utilized a diluted pulp (3% solids) with a high organic concentration (8 and 17 g/L). Flotation kinetics were measured by developing an innovative technique based on pulp color and image processing software. This technique facilitated the tracking of concentration changes over time under Beer-Lambert's Law. Subsequently, the results were adjusted using kinetic models commonly employed in mineral flotation, including the first-order, Kelsall, and Klimpel models. This comprehensive analysis sought to elucidate the underlying phenomenology and assess the potential for industrial-scale implementation. The laboratory findings indicate the possibility of achieving recoveries of up to 87%, with a first-order kinetic constant of 0.7 (1/min). Both the gas flow rate and the addition of surfactant exert substantial influence on this constant, consistent with the observed phenomenology of this study. This study explores the integration of image analysis in flotation for hydrocarbon-contaminated soil remediation. The research aims to optimize remediation strategies by examining variables such as Beer-Lambert's law and prevalent kinetic models. The study focuses on scalable, eco-friendly decontamination methods, emphasizing enhanced process control and comprehension within soil flotation systems.

2

Trends in animal production from organic farming [review]

Wójcik W., Solarczyk P., Łukasiewicz M., Puppel K., Kuczyńska B.

Acta Innovations

|

2018

|

no. 28

32--39

EN

Organic farming is an alternative method for dynamic agricultural system. Products that are obtained from organic farming are referred to as ecological or organic food [1]. These include products of animal origin that come from organic farming [2]. In the case of animal production in organic farming there are particular requirements for breed, animal welfare and feeding. Additionally, the origins of animals is also of crucial importance since, basically, such animals should be purchased from organic farms. However, there can be exceptions to this requirement, for instance, if the number of animals of a particular species or of a specific breed is not sufficient [3]. The main idea behind organic production is obtaining plant or animal products maintaining good soil structure, clean water and adjusting to the natural rhythm of nature. Enhancement of the social status has led to the situation where consumers pay more attention to the quality and origins of the products they choose. Numerous scientific papers from recent years, based on consumer’s opinion, show substantial impact of welfare system on the quality of animal products. Since ‘90s there has been a systematic surge of interest in products from ecological systems and demand for these, which in turn affect the development of this agricultural sector. The aim of the work is to compare the changes in organic production over the last 26 years in Poland with reference to the situation in Europe and whole globe. The research has been done on the basis of statistics since 1990 up till now as well as on scientific studies. Nowadays, there are increasing numbers of farms and redirections of production, as well as changes in the sizes of farms producing organic food.

3

The comparison of the bioactive compounds content in selected leafy vegetables coming from organic and conventional production

Kazimierczak R., Górka K., Hallmann E., Średnicka-Tober D., Lempkowska-Gocman M., Rembiałkowska E.

Journal of Research and Applications in Agricultural Engineering

|

2016

|

Vol. 61, nr 3

218--223

EN

Four species of leafy vegetables from organic and conventional production (coriander, leaf mustard, rocket salad and watercress) were used in this experiment. The research material consisted of edible parts of vegetables harvested in the beginning of September 2015. After harvest, dry matter content of plant samples was determined. Then plant material was freezedried and stored at -80oC until further laboratory analyses (for chlorophylls, total polyphenols, phenolic acids, flavonoids, carotenoids) were performed. The experiment indicated no differences in dry matter and chlorophylls content between plants from organic and conventional production. At the same time organic vegetables contained, on average, significantly more polyphenols (total) and phenolic acids in comparison to conventional ones. In contrast, plants from conventional production were more abundant in total flavonoids and carotenoids. The effect of agricultural production methods on the content of individual phenolic compounds and carotenoids in vegetables was also observed. Among the examined species, coriander (especially the organic one) was the richest in total polyphenols, in that phenolic acids and flavonoids, as well as carotenoids and chlorophylls. The obtained results provide confirmation that the leafy vegetables, especially those from organic farming, serve as important sources of valuable compounds, i.e. antioxidants with beneficial effects on the human body. Thus, they should be recommended in a preventive healthcare.

PL

W eksperymencie wykorzystano cztery gatunki warzyw liściowych pochodzących z produkcji ekologicznej i konwencjonalnej (kolendra, musztardowiec, rukola i rukiew wodna). Materiał badawczy stanowiły części użytkowe warzyw, które zebrano na początku września 2015. Po zbiorze w warzywach oznaczono zawartość suchej masy. Następnie materiał roślinny poddano liofilizacji i przechowywano w temperaturze minus 80 °C celem ustabilizowania składu chemicznego, a następnie przeprowadzono analizy laboratoryjne. W wyniku przeprowadzonych badań nie wykazano różnic w zawartości suchej masy i chlorofili pomiędzy roślinami z produkcji ekologicznej i konwencjonalnej. Jednocześnie warzywa z produkcji ekologicznej zawierały średnio istotnie więcej polifenoli ogółem i kwasów fenolowych w porównaniu do warzyw konwencjonalnych. Natomiast warzywa z produkcji konwencjonalnej były zasobniejsze we flawonoidy i karotenoidy. System produkcji wpływał również, choć nie tak wyraźnie, na zawartość poszczególnych związków fenolowych i karotenoidów w warzywach. Wśród badanych gatunków najbogatszą pod względem zawartości polifenoli ogółem, w tym kwasów fenolowych i flawonoidów, a także karotenoidów i chlorofili była kolendra, która pochodziła z produkcji ekologicznej. Uzyskane wyniki stanowią wyraźne potwierdzenie, że warzywa liściowe, a zwłaszcza te z upraw ekologicznych, są istotnym źródłem cennych składników, m.in. przeciwutleniaczy wykazujących korzystny wpływ na organizm ludzki. Dlatego też powinny być one zalecane w profilaktyce zdrowotnej.

4

Wpływ insektycydu nomolt 150sc stosowanego przeciwko muchówkom w skrzynkach ekologicznych na cechy dżdżownic eisenia fetida (sav.)

Garczyńska M., Kostecka J.

Inżynieria Ekologiczna

|

2011

|

Nr 27

13-18

PL

Wermikompostowano kuchenne odpady organiczne w skrzynkach ekologicznych z wykorzystaniem dżdżownic Eisenia fetida . Celem pracy była ocena wpływu insektycydu Nomolt 150SC, ograniczającego występowanie konkurencyjnych dla dżdżownic i uciążliwych dla prowadzącego skrzynkę , muchówek Sciaridae, w dawce wskazanej przez producenta jako "bezpieczna" środowiskowo, na populację dżdżownic. Wykazano, że preparat acylomocznikowy redukował liczebność larw muchówek, ale nie był obojętny dla rozmnażania się dżdżownic - istotnie obniżał zarówno liczebność jak i biomasę składanych przez nie kokonów.

EN

Organic kitchen wastes were vermicomposted in ecological boxes, using Eisenia fetida earthworms. The aim of the studies was the assessment of the effect of Nomolt 150SC on the earthworm population. An insecticide Nomolt 150SC (reducing occurrence of Diptera Sciaridae, being competitive for earthworms and burdensome to the person making us e of the ecological boxes) was applied at the dose recommended by the producers as "environmentally safe". It was demonstrated, that acylourea preparation reduced the number of Diptera larvas, but it did not have a neutral effect on earthworm reproduction - it significantly reduced both the number and biomass of the cocoons laid by them and the number of the young specimens.

5

Skuteczność preparatu NeemAzal-T/S w ekologicznej ochronie czereśni

Badowska-Czubik T., Rozpara E., Danelski W., Kowalska J.

Journal of Research and Applications in Agricultural Engineering

|

2010

|

Vol. 55, nr 3

11-13

PL

Badano przydatność preparatu NeemAzal-T/S (ekstrakt z nasion miodli indyjskiej, Azadirachta indica (L.) do zwalczania nasionnicy trześniówki (Rhagoletis cerasi L.) i mszycy czereśniowej (Myzus cerasi F.). Preparat stosowano dwukrotnie w sezonie w dawce 2,5 l/ha na czereśni odmiany 'Summit'. W pierwszym roku, skuteczność preparatu była wysoka i wynosiła powyżej 90% w zwalczaniu nasionnicy i powyżej 80% w zwalczaniu mszycy. W kolejnych dwóch latach, przy większym zagrożeniu przez szkodniki, notowano od 55 do 67% skuteczności w zwalczaniu nasionnicy trześniówki i 48-77% w zwalczaniu mszycy czereśniowej.

EN

NeemAzal-T/S in dose of 2,5 l/ha was tested against cherry fruit fly Rhagoletis cerasi and cherry blackfly Myzus cerasi in organic orchard during 3 vegetation seasons (2008-2010). The highest effectiveness of toxic biological insecticide NeemAzal-T/S (93,0%) was shown in control of Rhagoletis cerasi at the lowest population of the pests and 90% of mortality of cherry blackfly. Much lower toxic action (54,9-67,1%) of NeemAzal was shown against the higher population of cherry fly. The same tendency in controlling of the cherry blackfly was observed.