rss_2.0Ecological Chemistry and Engineering S FeedSciendo RSS Feed for Ecological Chemistry and Engineering Shttps://sciendo.com/journal/ECEShttps://www.sciendo.comEcological Chemistry and Engineering S 's Coverhttps://sciendo-parsed-data-feed.s3.eu-central-1.amazonaws.com/619fd9b032fa2f51bbbfe271/cover-image.jpg?X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Date=20211201T163537Z&X-Amz-SignedHeaders=host&X-Amz-Expires=604800&X-Amz-Credential=AKIA6AP2G7AKDOZOEZ7H%2F20211201%2Feu-central-1%2Fs3%2Faws4_request&X-Amz-Signature=b801f1c32b4f7749e047349a1bc41adc18031ea102976cddd6044b7d7751c05b200300Assessment of High Salinity Wastewater Treatment with Dewatered Alum Sludge-Aerobic Membrane Reactorhttps://sciendo.com/article/10.2478/eces-2021-0030<abstract> <title style='display:none'>Abstract</title> <p>The discharge of wastewater containing both high salinity and high organic content without prior treatment is detrimental to aquatic life and water hygiene. In order to integrate the advantages of membrane treatment and biological treatment, and exert the phosphorus removal efficiency of dewatered alum sludge, in this study, an aerobic membrane reactor based on dehydrated alum sludge was used to treat mustard tuber wastewater with salinity of 6.8-7.3 % under the conditions of 30 °C, 20 kPa trans-membrane pressure (TMP) and chemical oxygen demand (COD) of 3300-3900 mg/L. Three replicate reactors were applied to assess the operational performance under different organic loading rate (OLR). The results showed that all reactors were effective in removing COD, ammonia nitrogen (NH<sub>4</sub><sup>+</sup>-N) and soluble phosphate (SP) under the conditions of 30 °C and 20 kPa of TMP. Meanwhile, the effluent concentration of COD, NH<sub>4</sub><sup>+</sup>-N and SP all increased while OLR was changed from 1.0 to 3.0 kg COD/m<sup>3</sup>/day, and the effluent COD and NH<sub>4</sub><sup>+</sup>-N concentration except for SP could reach the B-level of Chinese “Wastewater quality standards for discharge to municipal sewers” when OLR was less than 3.0 kg COD/m<sup>3</sup>/day. This indicates that dewatered alum sludge-based aerobic membrane reactor is a promising bio-measure for treating high salinity wastewater.</p> </abstract>ARTICLE2021-11-23T00:00:00.000+00:00Human Health Effects of Heavy Metal Pollution in the Cross-Border Area of Romania and Serbia: A Reviewhttps://sciendo.com/article/10.2478/eces-2021-0025<abstract> <title style='display:none'>Abstract</title> <p>This review illustrates the state of air, water and soil pollution with heavy metals resulting from mining activities in the cross-border area of Romania and the Republic of Serbia. It also emphasizes the possible human health effects that certain heavy metals can cause. The heavy metals that were identified as polluting the air, water, and/or soil in the area of interest are: As, Cd, Cr, Cu, Fe, Hg, Mn, Mo, Ni, Pb, and Zn. Acute or chronic exposure to these heavy metals may cause numerous human health effects as they affect numerous organs and tissues (gastrointestinal tract, liver, lungs, kidneys, bladder, central nervous system, reproductive system, etc.). The review shows that the pollution produced by both abandoned and active mines cannot be neglected and underlines the necessity of changes in the current mining practices so that mining operations will assure better protection for the environment and human health.</p> </abstract>ARTICLE2021-10-11T00:00:00.000+00:00Modelling of Expansion Changes of Vilnius City Area and Impacts on Landscape Patterns Using an Artificial Neural Networkhttps://sciendo.com/article/10.2478/eces-2021-0029<abstract> <title style='display:none'>Abstract</title> <p>The present study aimed to analyse changes in the land cover of Vilnius city and its surrounding areas and propose a scenario for their future changes using an Artificial Neural Network. The land cover dynamics modelling was based on a multilayer perceptron neural network. Landscape metrics at a class and landscape level were evaluated to determine the amount of changes in the land uses. As the results showed, the Built-up area class increased, while the forest (Semi forest and Dense forest) classes decreased during the period from 1999 to 2019. The predicted scenario showed a considerable increase of about 60 % in the Built-up area until 2039. The vegetation plant areas consist about 47 % of all the area in 2019, but it will be 36 % in 2039, if this trend (urban expansion) continues in the further. The findings further indicated the major urban expansion in the vegetation areas. However, Built-up area would expand over Semi forest land and Dense forest land, with a large part of them changed into built- up areas.</p> </abstract>ARTICLE2021-10-11T00:00:00.000+00:00The Activation Energies and Optimum Temperatures of Olive Oil Hydrolysis By Lipase Porcine Pancreashttps://sciendo.com/article/10.2478/eces-2021-0026<abstract> <title style='display:none'>Abstract</title> <p>Lipase activity is a perfect indicator for the monitoring of processes of bioremediation of degraded soils. Lipase is also used in the processes of oil hydrolysis in wastewater treatment. To be able to predict and model processes with used lipase in environmental operations, knowledge of the kinetic parameters of the process are required. The paper presents the determined values of activation energies and optimum temperatures for porcine pancreas lipase. The parameters were estimated based on the literature of the activity curves <italic>vs</italic>. temperature for hydrolysis of olive oil by lipase. It was noticed that concentration of gum arabic added as an emulsifier during lipase activity measurements influences on the obtained values of determined parameters. A mathematical model describing the effect of temperature on porcine pancreas lipase activity was used. Based on the comparison analysis, the optimum temperature <italic>T<sub>opt</sub></italic> were obtained in the range from 313.30 ±0.56 to 319.62 ±0.96 K, activation energies <italic>E<sub>a</sub></italic> were from 51 ±10 to 82.6 ±9.9 kJ/mol, and values of deactivation energies <italic>E<sub>d</sub></italic> were in the range from 122.7 ±4.0 to 150.9 ±5.8 kJ/mol.</p> </abstract>ARTICLE2021-10-11T00:00:00.000+00:00Tetracycline Removal from Water by Adsorption on Geomaterial, Activated Carbon and Clay Adsorbentshttps://sciendo.com/article/10.2478/eces-2021-0021<abstract> <title style='display:none'>Abstract</title> <p>The use of antibiotics for breeding and for humans increased considerably in recent years, as a dietary supplement to enhance animal growth. This frequent use leads to the detection of residues in water and wastewater. Thus, the emergence of new strains of bacteria resistant to these antibiotics and, can lead to incurable diseases of livestock, and can lead to a possible transmission of these strains to humans. The purpose of this work is to develop new materials based on treated Maghnia clay, activated carbon, cement, and PVA polymer, named geomaterials. These materials were intended for the containment of hazardous wastes in landfills. The removal of tetracycline from aqueous solution was tested by adsorption onto synthesised geomaterials and their mineral constituents. Adsorption kinetics revealed that tetracycline was rapidly retained by GM and ATMa. This was confirmed by the relatively short equilibrium time of 30 min. The pseudo-second-order and intraparticle models well fitted the adsorption kinetic of the TC-adsorbent studied systems. It was noticed that the adsorption kinetic passes through several mechanisms, was demonstrated by the multi-linearity on the plot of <italic>q<sub>t</sub></italic> against the square root of <italic>t.</italic> The adsorption capacity (<italic>Q<sub>a</sub></italic>) of TC onto GM is pH-dependent. Indeed, <italic>Q<sub>a</sub></italic> reaches a maximum value (<italic>Q<sub>a</sub></italic> = 12.58 mg ∙ g<sup>–1</sup> at a very acidic pH of 2, then the adsorbed amount decreases to reach a minimum value at pH of 8, and for basic pHs<italic>Q<sub>a</sub></italic> increases up to 10 mg ∙ g<sup>–1</sup>.</p> </abstract>ARTICLE2021-10-11T00:00:00.000+00:00Evaluation of Total Organic Carbon Quantity and Emissions of CO from Soil Into the Atmosphere Near Streethttps://sciendo.com/article/10.2478/eces-2021-0027<abstract> <title style='display:none'>Abstract</title> <p>Soil as an ecosystem is actively involved into climate formation process. Therefore, it is important to assess such soil quality indicators as total organic carbon (TOC) and CO<sub>2</sub> emissions. Soil organic matter is considered to be its indicator of quality, which is one of the most important components of biosphere consistency and stability. Soil respiration shows carbon emission from soil into the atmosphere. This is a great indicator, illustrating soil biological activity. Impact of soil temperature, air humidity, time of day was evaluated on CO<sub>2</sub> emission from the soil. The highest CO<sub>2</sub> emission is observed in afternoon hours, up to 0.201 g CO<sub>2</sub>∙m<sup>–2</sup>·h<sup>–1</sup>.</p> </abstract>ARTICLE2021-10-11T00:00:00.000+00:00Effects of Essential Oils on in Vitro Growth of Fungi and Infecting Button Mushroomhttps://sciendo.com/article/10.2478/eces-2021-0028<abstract> <title style='display:none'>Abstract</title> <p>The aim of the studies was to investigate the effect of camel grass, lavender, patchouli, peppermint and tea tree essential oils, and their mixtures on the <italic>in vitro</italic> growth of pathogenic fungi <italic>Cladobotryum dendroides</italic> and <italic>Mycogone perniciosa</italic>, occurring in the cultivation of button mushroom (<italic>Agaricus bisporus</italic>). The mycelial growth of the tested pathogens was evaluated on PDA medium. Essential oils were added in three doses: 0.25; 0.5 and 1 mg·cm<sup>–3</sup> of PDA medium. Camel grass and peppermint essential oils applied at the highest dose inhibited completely the <italic>in vitro</italic> growth of <italic>C. dendroides</italic> mycelium. Lavender oil used at the amount of 1 mg·cm<sup>–3</sup> reduced the growth of the pathogen by 90 %. In the case of <italic>M. perniciosa</italic> the complete inhibition of the pathogen’s growth was observed after the addition of camel grass oil to PDA medium, irrespective of a dose, and lavender oil at the doses of 0.5 and 1 mg·cm<sup>–3</sup>. The efficacy of the tested mixtures against <italic>M. perniciosa</italic> was high. Generally, all mixtures of essential oils, irrespective of a dose, completely controlled the growth of the pathogen. The complete inhibition of the growth of <italic>C. dendroides</italic> was observed only on the medium with the addition of the mixture of camel grass and peppermint oils at the highest dose. The conducted research showed that natural essential oils due to their antifungal properties could be useful in the Integrated Disease Management for the protection of button mushroom against diseases. They could be an effective alternative to synthetic chemical fungicides.</p> </abstract>ARTICLE2021-10-11T00:00:00.000+00:00Source Identification and Ecological Risk of Polycyclic Aromatic Hydrocarbons in Soils and Groundwaterhttps://sciendo.com/article/10.2478/eces-2021-0024<abstract> <title style='display:none'>Abstract</title> <p>Polycyclic aromatic hydrocarbons (PAHs) are formed from anthropogenic activities, i.e. industrial emissions, incomplete combustion of petroleum, coal and other fossil fuels and other industrial and domestic activities. Research areas of this study are four representative locations in the industrial complex, in the city of Banja Luka, Republic of Srpska, Bosnia and Herzegovina. The main objective of the paper is to determine the ecological risk and to assess probable sources of PAHs contamination in soil and groundwater. The results of this study reflect the effects of coal combustion (pyrogenic origin), petrogenic and biomass origin and may provide basic data for the remediation of PAHs in the location. The ecological risk in soil (at depths of 30, 100, 200, 300 and 400 cm) and groundwater is determined. The mean values of ecological risk in soil and groundwater decreased with soil depth. Values of RQ<sub>(NCs)</sub> for groundwater were found at high ecological risk, for Ant, Chr, DahA, Acy, Pyr, BaA, Phe, Flo, Nap, Ace and Fluo, with values 28.57, 20.59, 300.00, 242.86, 185.71, 1700.0, 76.67, 53.33, 15.83, 100.00 and 57.14, respectively. ∑16PAH indicated high ecological risk for most PAHs, which decreased with soil depth. The value of RQ<sub>(NCs)</sub> for ΣPAHs in groundwater indicates high ecological risk (ΣPAHs ≥ 800 and RQ<sub>(MPCs)</sub> ≥ 1). This is the first study on the ecological risk of PAHs in soil and groundwater in industrial soils in Banja Luka and provides baseline information for further studies and additional investigations of this industrial complex.</p> </abstract>ARTICLE2021-10-11T00:00:00.000+00:00Adsorption Performance of Dyes Over Zeolite for Textile Wastewater Treatmenthttps://sciendo.com/article/10.2478/eces-2021-0022<abstract> <title style='display:none'>Abstract</title> <p>Removal of textile dyes from wastewater have recently attracted much attention, due to the toxicity, difficult visibility, and thereby the negative consequences on the aqueous environment. Therefore, there have been diverse promising new techniques such as adsorption for dyes removal from industrial wastewater. Compared to the highly cost treatment techniques, removal of dyes using the adsorption process is relatively simple and requires less cost. Synthetic zeolite was used in this research as a high capacity nano-adsorbent for the removal of reactive dyes from coloured wastewater. The impact of main parameters: dose of adsorbent (0.0025 to 0.02 g), pollutant concentration (25 to 200 mg/L), contact time (10 to 120 minutes), degree of agitation (25 and 300 rpm), and solution pH (2 to 8) on adsorption performance of the synthesised zeolite was investigated. The optimum values of these parameters to remove dyes efficiently at 90 % removal were 0.02 g, 200 mg/L, 80 min, 300 rpm, and 6-7 respectively. Also, two models were evaluated, the Langmuir and Freundlich isotherms. Langmuir isotherm was more efficient for representing the data than the Freundlich. The results of the Langmuir isotherm gave <italic>K<sub>L</sub></italic> = 0.08 L/mg, <italic>q<sub>m</sub></italic> = 6.02 mg/g, and <italic>R</italic><sup>2</sup> = 0.98, which fitted to the adsorption data of zeolite. Reactive dye adsorption by synthetic zeolite is a vital tool in identifying the fate of dye removal from industrial wastewater treatment plants.</p> </abstract>ARTICLE2021-10-11T00:00:00.000+00:00Assessment of Biological Degradability of the Waste Produced by Food Industryhttps://sciendo.com/article/10.2478/eces-2021-0023<abstract> <title style='display:none'>Abstract</title> <p>Organic waste from production processes is unutilised potential for the production of energy from renewable sources. The submitted paper studies the conditions of anaerobic degradation of selected waste from food industry (diary and distillery) when biogas is produced. Both types of organic waste have low pH values. Ash form municipal incineration as a material for the treatment of pH of waste was used. Except for the pH increase during anaerobic degradation, ash also serves as a source of macroelements for inoculum microorganisms. Kinetics of anaerobic biological digestion of organic material based on the change of pressure and biogas production depending on the ash addition (change of pH) of input samples was observed. Beside these tests, degradability of the waste was assessed by limiting biologically degradable ratio, <italic>BR</italic> and specific speed of degradability, <italic>q</italic>. pH values were adjusted with different amounts of ash (0.5; 1.8; 2.7 g/g of dry matter of organic material). Results of the research confirmed that the addition of optimum amount of ash has a positive effect on anaerobic degradation of organic materials.</p> </abstract>ARTICLE2021-10-11T00:00:00.000+00:00Passive and Active Biomonitoring of Atmospheric Aerosol with the Use of Mosseshttps://sciendo.com/article/10.2478/eces-2021-0012<abstract> <title style='display:none'>Abstract</title> <p>The aim of the carried out research was passive and active biomonitoring of woodlands in the Opole province. <italic>Pleurozium schreberi</italic> mosses were used during the research, in which the following heavy metals concentrations were determined: Mn, Fe, Ni, Cu, Zn, Cd and Pb. Concentrations were determined with absorption atomic spectrometry (AAS). On the basis of the carried out research, concentrations of heavy metals in moss samples used in the passive and active biomonitoring methods were compared. The obtained results indicate that <italic>Pleurozium schreberi</italic> mosses can be successfully used in both passive and active biomonitoring, however, these methods should not be used interchangeably in a defined study area. On the basis of carried out research it was determined that the applied biomonitoring methods can be supplementary.</p> </abstract>ARTICLE2021-07-23T00:00:00.000+00:00Removal of Lead(II) and Zinc(II) from Aqueous Solutions Applying Fibber Hemp ( L.)https://sciendo.com/article/10.2478/eces-2021-0017<abstract> <title style='display:none'>Abstract</title> <p>Lead and zinc are heavy metals with toxic properties. These chemical elements are found in wastewater. The article deals with the removal of lead(II) and zinc(II) ions from polluted water using adsorption. As object of researches was selected natural polymer - fibber hemp (<italic>Cannabis sativa</italic> L.). Big quantities of fibber hemp are produced as waste in textile, agricultural industry, and therefore their usage could help to solve two problems -reducing quantity of fibber hemp as waste and reducing of water pollution by heavy metals. Pb(II) and Zn(II) ions adsorption with fibber hemp was investigated for contact time, pH, and heavy metal ions concentration impact. Pb(II) and Zn(II) ions biosorption rate was highest within the first hour, with optimal their biosorption recorded at pH = 5.0. Highest lead and zinc ions removal efficiency was recorded after 240-480 min and reached 60.5 and 61.7 % respectively. This study demonstrated the applicability and effectiveness of fibber hemp in lead and zinc ions removal, which could be applied for the sewage treatment plant in small scale.</p> </abstract>ARTICLE2021-07-23T00:00:00.000+00:00The Issue of Shading Photovoltaic Installation Caused by Dust Accumulation on the Glass Surfacehttps://sciendo.com/article/10.2478/eces-2021-0013<abstract> <title style='display:none'>Abstract</title> <p>The issue of accumulation of dust and other pollutants on the surface of photovoltaic modules was thoroughly analysed over the years. One of the first surveys in this field of knowledge linked pollutant accumulation on the module surface with transmittance loss of its glass covering, which leads to lessened amount of solar radiation reaching solar cells. First stage of this accumulation process is linear transparency loss, and second stage - molecule agglomeration and settlement some grains on the already existing layer of dust. Additionally, the pace of working parameters reduction for photovoltaic installation is influenced by the type of dust itself. Molecules with smaller grains cover the surface much more densely, therefore limiting the amount of light passing though the top glass layer far more than molecules with bigger grains. The aim of the carried out study was to find the relationship between dust surface density and change in electrical parameters. Such approach makes it possible to compare electrical and physical parameters of different photovoltaic modules. Additionally, glass coverage itself was noted to have a significant impact on the overall decrease in working parameters of PV modules.</p> </abstract>ARTICLE2021-07-23T00:00:00.000+00:00Mycoremediation of Soil Contaminated with Cadmium and Lead by sp.https://sciendo.com/article/10.2478/eces-2021-0020<abstract> <title style='display:none'>Abstract</title> <p>Conducted research determined the effect of the <italic>Trichoderma</italic> fungi on the presence of cadmium and lead ions in the soil contaminated by mentioned elements. The aim of the study was to demonstrate whether the fungi of this kind can contribute to remediation of soil by the immobilization of heavy metals. Experiments were conducted in laboratory conditions. The vaccine containing spores of <italic>Trichoderma asperellum</italic> was introduced into the soil contaminated with cadmium and lead by direct injection. Analyses of the soluble fraction of selected heavy metals were performed after 3 and 15 days of cultivation using atomic absorption spectrometry (AAS). Statistical significant positive effects on the immobilization of lead ions and no statistical differences in inhibition of cadmium translocation were observed. The results showed that <italic>Trichoderma</italic> fungi are suited to support the process of environment remediation by removal of lead. This suggests possible application of <italic>Trichoderma asperellum</italic> in mycoremediation and supporting role in phytoremediation of soil.</p> </abstract>ARTICLE2021-07-23T00:00:00.000+00:00Compost Produced with Addition of Sewage Sludge as a Source of Fe and Mn for Plantshttps://sciendo.com/article/10.2478/eces-2021-0019<abstract> <title style='display:none'>Abstract</title> <p>Direct application of sewage sludge to soil is controversial due to, among others, its highly variable composition, odour, and risks for health. The obtained composts with the addition of sewage sludge were tested for the contents and availability of manganese and iron. Once composts were applied to the soil, their effect on the content and availability of Mn and Fe in soil and bioaccumulation in the plant were determined. The addition of sewage sludge enriched composts with manganese and iron, but did not increase the content of water-extracted forms of Mn and Fe. The compost with addition of biochar had more organic matter-bound forms of Mn and Fe. Composts amended with sewage sludge had lower effect on the amount of <italic>Poa pratensis</italic> L. biomass than maize straw compost. The content of Mn and Fe in <italic>Poa pratensis</italic> L. was in the range permissible for biomass used as fodder. Smaller addition of all composts to the soil significantly increased the content of mobile manganese forms; however, neither the type nor the dose had effect on the content of iron mobile forms. There was no significant differences in the content of organic matter-bound forms of Mn and Fe in soil after the application of composts.</p> </abstract>ARTICLE2021-07-23T00:00:00.000+00:00Volumes Ratio Optimization in a Cascade Anaerobic Digestion System Producing Hydrogen and Methanehttps://sciendo.com/article/10.2478/eces-2021-0014<abstract> <title style='display:none'>Abstract</title> <p>As focus of humans has turned to renewable energy, the role of anaerobic digestion has started to become economically viable. Reducing the volume of agro-wastes for the generation of gaseous and liquid fractions with energy carriers and valuable products is an enormous challenge. A two-stage anaerobic digestion process consisting of hydrogenic stage followed by methanogenic stage was studied in a laboratory scale. Five simple nonlinear models of this continuous cascade process were studied in order to determine the optimal ratio of working volumes of bioreactors, in view of maximising energy production. This ratio was reported for all adopted models. The optimal ratio (maximal energy production criterion) depends of the adopted mathematical model. Static characteristics of both bioreactors were obtained using <italic>Symbolyc</italic> toolbox of <italic>Matlab.</italic> Numerical experiments concerning dynamics of the main variables of both bioreactors for these models using <italic>Simulink</italic> of <italic>Matlab</italic> are performed for different step changes of the dilution rate of the first bioreactor, together with the influence of the substrate (acetate) inhibition for one of the models. The value of the constant of inhibition plays an important role on the admissible interval of the dilution rate. The developed idea could serve for optimally designed experiments of anaerobic digestion for production of hydrogen and methane from lignocelluloses wastes (wheat straw) in two phase process.</p> </abstract>ARTICLE2021-07-23T00:00:00.000+00:00Heat Recovery of Compost Reactors: Field Study of Operational Behaviour, Heating Power and Influence Factorshttps://sciendo.com/article/10.2478/eces-2021-0015<abstract> <title style='display:none'>Abstract</title> <p>This study evaluates the common process and set-up design of a static compost bioreactor for heat recovery. A technology, which fits the goal of a sustainable, growing bioeconomy which combines the utilization of compost heat and compost material. Interest on this technology has been growing the last years but precise data of pilot scale reactors is rare. Data is required to adjust the process for custom needs and further technical development. Therefore, lignin-cellulose based biomass was composted in unaerated cylindrical compost reactors size 20 to 70 m<sup>3</sup> for 140 days. The biomass comes with C:N ratio of about 25:1, water content of 43-48 %, organic matter content of 40.6 % d.m. and calorific value of 8.3 MJ/kg d.m. Spatial distribution of temperature and gas concentration (oxygen, carbon dioxide, methane) within the reactor shows methane production of the anaerobic core area. Maximum thermal power of 5.2 kW from a 63 m<sup>3</sup> reactor with average temperature of heating flow about 40 °C was reached. Maximum recovered heating power of 4.8 MJ/kg d.m. was calculated for an operation of 6 month. This corresponds to 50 % of the measured calorific value. Biggest influence factors detected on the recovered heating power of the pilot scale reactor has been the size of reactor, the set up quality and the control of heat exchanger. The spatial correlation between heat production and aerobic digestion suggests a technical development in terms of aeration.</p> </abstract>ARTICLE2021-07-23T00:00:00.000+00:00Effects of Human Activities in the Coastal Zone of Laizhou Bayhttps://sciendo.com/article/10.2478/eces-2021-0016<abstract> <title style='display:none'>Abstract</title> <p>The serious destruction of resources and environment in Laizhou Bay has attracted extensive attention of researchers. This study mainly analysed the changes of fish structure and environment in the coastal zone of Laizhou Bay caused by human activities. By consulting literatures and field measurements, the changes of dominant fish species, coastline and sea water intrusion were analysed. The results showed that dominant fish species in Laizhou Bay change from high-economic species to low-economic species under the influence of human activities, and the coastline erosion was serious, and the area of sea water intrusion was also increasing year by year. It is concluded from the research results that human activities had a significant impact on the structure of fish school and the environment. It is necessary to arrange human activities in an appropriate amount to reduce the overexploitation of resources in order to restore the fishery resources and environment in Laizhou Bay.</p> </abstract>ARTICLE2021-07-23T00:00:00.000+00:00Mobility of Potentially Toxic Elements from the Abandoned Uranium Mine’s Spoil Bankhttps://sciendo.com/article/10.2478/eces-2021-0018<abstract> <title style='display:none'>Abstract</title> <p>This study is part of the ongoing environmental monitoring program of the abandoned Mecsek uranium mine during the remediation period. During this program on the recultivated No.1 spoil bank, the radioactivity and the potentially toxic element (PTE) contents in the covering soil had shown some anomalies which refers to possible migration alongside the slope. Therefore, in a previous study, soil and plant samples were collected from top to bottom position of the slope and the total element content was determined by multi-elemental inductively coupled plasma-optical emission spectrometry. The results have indicated that there was a high possibility for PTEs to be mobile and available for uptake by plants. To confirm this indication in the present study for the soil samples the BCR sequential extraction procedure was applied to characterise the environmental mobility of PTEs, and it was compared with soil pH and cation exchange capacity (CEC). The results indicated that the ratio of Cd, Co, Mn, Pb, and U in the non-residual fractions ranged between 36.8 to 100 % and increased from top to bottom direction. The comparison showed that the samples with the lowest pH and CEC had the most mobility of the PTEs. The distribution of U, Cd, Mn, Co, and Pb in fractions indicated that some parts of the spoil deposit require additional steps to hinder the migration through the covering soil layer, and the BCR sequential extraction procedure has proven to be useful in providing information for the planning and management of remediation operations.</p> </abstract>ARTICLE2021-07-23T00:00:00.000+00:00Need for Cognitive Closure, Information Acquisition and Adoption of Green Prevention and Control Technologyhttps://sciendo.com/article/10.2478/eces-2021-0011<abstract> <title style='display:none'>Abstract</title> <p>In this paper, we use the OLS regression method to analyse the influencing mechanism of the NFCC on farmers’ adoption of green prevention and control technology and further verify the mediating effect of information acquisition. The results show that the NFCC has a direct effect on the adoption of green prevention and control technology, and information acquisition has a mediating effect. The first stage of cognitive closure has a more significant effect on farmers’ adoption of green prevention and control technology, information acquisition ability has a significant positive impact on farmers’ adoption of green prevention and control technology, and information acquisition has an incomplete mediating effect on the impact of cognitive closure on the adoption of green prevention and control technologies. This paper further studies and verifies the action path of two dimensions of the NFCC on farmers’ adoption of green prevention and control technology. The results have certain theoretical significance for expanding the knowledge of farmers’ green prevention and control technology behaviour and further enriching the research on farmers’ cognition.</p> </abstract>ARTICLE2021-04-23T00:00:00.000+00:00en-us-1