scholarly journals Evaluation of the Ecological Potential of Microorganisms for Purifying Water with High Iron Content

Water ◽  
2021 ◽  
Vol 13 (7) ◽  
pp. 901
Author(s):  
Ekaterina Pleshakova ◽  
Clement Ngun ◽  
Mikhail Reshetnikov ◽  
Maxim Viktorovich Larionov
Keyword(s):  
Inhibitory Concentration ◽  
Maximum Growth ◽  
Metal Resistance ◽  
Growth Characteristics ◽  
High Concentration ◽  
High Iron Content ◽  
Inoculum Dose ◽  
Number Of Microorganisms ◽  
The City ◽  
Microbial Isolates

The ability of a number of microorganisms isolated from highly magnetic soil of the city Mednogorsk to oxidize Fe (II) under conditions of periodic cultivation in a liquid medium was studied. Among the studied microorganisms, two microbial isolates with maximum growth characteristics and iron-oxidizing activity were selected and identified: Bacillus megaterium 69.3 and B. megaterium 69.5. Individual levels of metal resistance of the isolates were determined: maximum tolerated concentration (MTC) for Fe (II) of the isolates B. megaterium 69.3 and B. megaterium 69.5 was 1200 mg L−1, minimum inhibitory concentration (MIC) was 1800 mg L−1. Both microbial isolates actively oxidized Fe (II) by reducing its high concentration in the medium (1.19 g L−1) by 33 and 39% during 14 days of culturing. Total increase in the biomass of B. megaterium 69.3 and B. megaterium 69.5 after 14 days of culturing was 15.3 and 14.7 g L−1; the active parts of the biomass increased 8.7- and 6.9-fold compared to the inoculum dose, respectively. These microbial isolates could be used in future in the biotechnological process of water purification with increased/high levels of Fe (II).

A PROMISING ASSORTMENT OF TREES AND SHRUBS FOR LANDSCAPING IN VOLGOGRAD CITY

2021 ◽  
pp. 5-18
Author(s):  
E.N. Tyukhtina ◽  
Keyword(s):  
Negative Impact ◽  
Ornamental Plants ◽  
Botanical Garden ◽  
Climatic Conditions ◽  
Green Spaces ◽  
Ecological Situation ◽  
High Concentration ◽  
High Level ◽  
The City ◽  
Trees And Shrubs

The article deals with one of the most relevant topics of the modern city and ecology - the problem of landscaping in Volgograd. The city is characterized by an industrial urbanism, with a high concentration of population, saturation of production facilities and vehicles, which contributes to a high level of negative impact on the environment. The pace of greening of the city lags behind the pace of construction of the residential sector, and the existing green spaces do not meet the sanitary and hygienic, aesthetic requirements. The prospects of this problem are determined, the existing green spaces are considered, data on the climatic conditions of the city and the ecological situation are given. Improvement in the field of landscaping is associated with the scientifically sound placement of green spaces, taking into account all the factors that affect the growth and development of plants in the urban environment. Unfortunately, due to the uneven distribution of the assortment of trees and shrubs, the species composition of the central streets and squares of the city is extremely poor. The study focuses on the role of the botanical garden in urban landscaping and aims to create recommendations for the sorting of tree and shrub plants for urban landscaping. As a result of the analysis of the assortment of ornamental plants of the open ground of the botanical garden, the article proposed species and varieties of woody and shrubby plants that have passed the introduction tests for more than 5-10 years. Recommendations for sorting are aimed at improving the ecological situation of the city and greening the recreation areas of citizens. The proposed list of tree and shrub species cannot fully solve the problem of greening the city, but it will help to significantly enrich the composition of tree and shrub plants.

scholarly journals EFFECT OF IRON IN DRINKING WATER ON THE MORBIDITY RATE IN THE POPULATION OF THE CITY OF OREL

2019 ◽  
Vol 96 (11) ◽  
pp. 1049-1053 ◽  
Author(s):  
Nataliya A. Egorova ◽  
N. V. Kanatnikova
Keyword(s):  
Drinking Water ◽  
Iron Content ◽  
Subcutaneous Tissue ◽  
Scale Up ◽  
Correlation Coefficients ◽  
Morbidity Rate ◽  
Human Organism ◽  
Urogenital System ◽  
High Iron Content ◽  
The City

The population of the city of Orеl consumes drinking underground water of Zadonsko-Optuhovsky and Voronezh-Livny aquifers with natural iron content, annual mean levels of which over the observation period from 2007 to 2015 exceeded the maximum allowable concentration (0.3 mg/l) by 1.03 to 1.43 times, with a maximum of 3.67 to 17.7 times. Although an elevated iron content in drinking water has been considered primarily in terms of organoleptic changes, several sanitary studies of recent years have revealed the prolonged use of water containing iron in concentrations, which exceed the maximum allowable ones, to scale up overall morbidity as well as the development of blood, skin and subcutaneous tissue diseases, musculoskeletal problems, digestive, urogenital system and allergic disorders. There are many reports concerning causes and the harm to human organism due to iron overload, and largely explanation of the possibility of developing the above types of pathology. The purpose of the study is to identify relationships between levels of total iron content in drinking water and the morbidity rate of the population of the city of Orel. Investigations were executed with the use a correlation analysis. For the period from 2007 to 2015, there were revealed direct correlation relationships between the annual average concentrations of iron in drinking water and the total morbidity rate of children and adults as well as 11 types of non-infectious pathologies, including diseases of the respiratory and urogenital system, atopic dermatitis, reactive arthropathies and eczema in children; diseases of blood and blood-forming organs, reactive arthropathies, gastritis and duodenitis in adolescents, stenocardia, cerebrovascular diseases, diabetes mellitus, gastritis, duodenitis and liver diseases in adults. The correlation coefficients amounted to from 0.66 to 0.86, with an accuracy of 0.01-0.05. These relationships may be causal in nature, as it was proved by similar results obtained in the Tula region, Primorsky Krai, and Sverdlovsk region where the population uses ground water with a high iron content. Apparently, it should be more careful in the assessment of the elevated iron content in drinking water from a hygienic viewpoint and must focus, among other things, on its possible causal relations with the morbidity rates of the population, rather than scrutinizing primarily its impact on the organoleptic water properties.

Characteristics and Hazard of the Wastewater from the City Garbage Transfer Stations

2014 ◽  
Vol 955-959 ◽  
pp. 2919-2925
Author(s):  
Qing Wang ◽  
Wen Yu Zhao ◽  
Bang Ding Ma ◽  
Yu Wu ◽  
Kang Huai Liu
Keyword(s):  
Membrane Separation ◽  
Sewage Treatment ◽  
Toxic Heavy Metals ◽  
High Concentration ◽  
Average Value ◽  
Urban Sewage ◽  
Waste Transfer ◽  
Wastewater Samples ◽  
Transfer Stations ◽  
The City

Nine wastewater samples of waste transfer stations had been gathered and analysis in Guilin city. The results indicate that all sewage belongs to high concentration organic wastewater originating from the waste transfer stations. The average value of wastewater’s COD is 5759mg/L and the maximum value is nearly 28000 mg/L. Its organic pollutants are mainly related to the residues of animals and plants. The content of lead(Pb), Chromium (Cr) and other toxic heavy metals in the wastewater could be 10 times higher than emissions standards, and especially total phosphorus’(TP) content could reach to more than 20 times of discharge standard. In order to protect the environmental quality in the vicinity of them and normally operating of the urban sewage treatment plants, it is necessary that these wastewater should be treated alone. A proposal is that integrated equipment should be made by using some technologies combined biology with membrane separation. Through disperse treatment by the equipment, urban sewage transfer stations could be reused or discharged on standard.

Costruire per il ceto medio a Milano. Note sulla filiera imprenditoriale

TERRITORIO ◽  
2013 ◽  
pp. 88-94
Author(s):  
Luca Gaeta
Keyword(s):  
Middle Class ◽  
Property Market ◽  
High Concentration ◽  
Middle Classes ◽  
Construction Companies ◽  
Land Owners ◽  
The Social ◽  
City Construction ◽  
The City

The precise boundaries of the supply chain for the production of housing for the middle classes in Milan during the boom years are not clearly defined. And yet its activity is of crucial importance to an understanding of the social and tangible forms of the middle class city. Construction companies constituted the key link in relations between land owners, clients, architects and end users of the asset that is a home. This paper offers a provisional picture which documents the firms most active in the sector, the prevailing operating practices and two businessmen who were interviewed. The conclusions identify two lines for further research into the middle class city: the role of non-professional mediators in the property market and the high concentration of up-market new housing construction within the ‘cerchia dei bastioni' (inner part of the city).

Finding of artisanal uses of elemental mercury in the city of Murcia in medieval times

2021 ◽  
Author(s):  
José María Esbrí ◽  
Luis Mansilla-Plaza ◽  
María Jesús Sanchez-Gonzalez ◽  
Pablo Higueras
Keyword(s):  
Atomic Absorption ◽  
Elemental Mercury ◽  
Absorption Spectrometry ◽  
Speciation Analysis ◽  
Outer Wall ◽  
High Concentration ◽  
Entire Area ◽  
High Concentrations ◽  
Under Construction ◽  
The City

<p>Mercury (Hg) was used in gilding techniques since ancient times. This metal gilding technique consisted of applying an amalgam of Au and Hg to the surface of a metallic object and then removing the Hg to achieve adhesion of the Au to the support. The traditional preparation of amalgam was a mixture of Au with Hg (in a ratio of 1/8). After this preparation, the mixture usually was ground in a mortar, heated, and then cooled by pouring it into water. The paste was applied to the areas to be browned and then the piece was subjected to mild temperatures so that the Hg evaporated, leaving a thin layer of Au on the surface of the object.</p><p>The origin of this work is the discovery of an evident quantity of liquid Hg on a site under construction, near the old wall of the city of Murcia, at a level identified as from medieval times. To elucidate the origin of this Hg, a sampling of medieval materials has been carried out throughout the site, including both the area with liquid Hg, the entire area what appears to be the work room and the adjacent rooms. The sampling has been carried out using an Ejkelkamp sampler at various depths. These soil samples were analysed by Energy Dispersion X-Ray Fluorescence using a PanAlytical device. Total Hg and Hg speciation data were obtained by Atomic Absorption Spectrometry using a Lumex equipment. In addition to this, a gaseous mercury monitoring has been carried out using a portable atomic absorption equipment to search Hg sources and gaseous Hg dispersion in the atmosphere of the studied site. Results of the survey has shown an evident and intense soil Hg pollution in a small area of 2x2 m. This affected area was located near the outer wall of the medieval building and was very restricted, which suggests that it was a storage place for liquid Hg for later use in other areas. The degassing of these recently uncovered materials produced a significant dispersion of the Hg gas throughout the enclosure. In addition to this, samples of medieval materials have shown very high concentrations of Hg in the vicinity of the contaminated area, and high concentrations in the rest of the enclosure. Speciation analysis have shown that the Hg in this part of the enclosure is in the form of metacinnabar and Hg bound to humic acids, which suggests the presence of an atmosphere with extremely high concentration of gaseous Hg in medieval times that was later deposited in the soil, being fixed to its organic phase. Multielemental analysis has shown additional high concentrations of Pb, Cu and Sn, suggesting that the artisanal works in the enclosure involved these elements too. While waiting for more specific archaeology works that can corroborate it, the origin of this Hg in the area could be the storage for the realization of gilding work on metals with this element.</p><p>This work was funded by the company “Obras y Proyectos Soyma”.</p>

THE MOLYBDENUM FORM MIGRATION IN THE LYBID RIVER WATER, FLOWING THROUGH THE CITY OF KIYV

2019 ◽  
pp. 88-94
Author(s):  
I.I. Ignatenko
Keyword(s):  
Humic Substances ◽  
Maximum Permissible Concentration ◽  
Anthropogenic Pollution ◽  
Ion Concentration ◽  
Primary Role ◽  
High Concentration ◽  
Dissolved Organic Matters ◽  
Living Organisms ◽  
The City ◽  
Water Dilution

The research results of molybdenum form migration in the water of the Lybid river. The total molybdenum content was 5,8–35,0 μg/dm3, which is much higher than in the water of the Kaniv reservoir – 2,7–8,0 μg/dm3. The ratio of dissolved and suspended molybdenum forms was 80,8–98,5 and 1,5–19,2 %, respectively. The peculiarity of the Lybid river was the presence of molybdate-ions in all sections of the river. This caused a high concentration of dissolved molybdenum form and is an indication of anthropogenic pollution. Molybdate-ions are detected throughout the entire length of the river. They comprised of 5,6–23,2 μg/dm3 and always exceeded the maximum permissible concentration for fishery reservoirs (1,2 μg/dm3). The molybdate-ion concentration was 15 and 18 times higher in the two sections of the Lybid river. Due to their high concentration this can be dangerous for the development of hydrobiota, because the MoO42-–ions are toxins to living organisms. In conclustion, the molybdate-ions in the water of the Lybid river were partly connected to complexes of dissolved organic matters (DOM). The main groups of which are carbohydrates and protein, humic substances. As a result of the processes of water dilution and complexation with DOM, in the water of the Kaniv reservoir, the MoO42- -ions weren’t detected. The humic substances played the primary role in the complexation of molybdate-ions.

PERSONAL ART IN TEOTIHUACAN: THE THIN ORANGE GRAFFITI

2015 ◽  
Vol 26 (2) ◽  
pp. 295-311 ◽  
Author(s):  
Michael W. Spence
Keyword(s):  
Personal Identity ◽  
Central Zone ◽  
The State ◽  
Classic Period ◽  
High Concentration ◽  
Daily Lives ◽  
The City

AbstractIn the Classic period Teotihuacan imported large quantities of Thin Orange ware from the Tepexi de Rodríguez area of Puebla. Thin Orange bowls were widely distributed in the city, many of them with post-firing graffiti inscribed on their walls or bases. Although not highly visible, the graffiti seem to have served as owner's marks. Some of the images, particularly in the city's central zone with its high concentration of elite residences and public structures, were drawn from the formal iconography of Teotihuacan. Most, however, seem to have been idiosyncratic expressions of personal identity or simply marks with no wider meaning. This general disinterest in the formal iconography as a source of personal imagery suggests that the ideology of the state may not have penetrated deeply into the daily lives of most Teotihuacanos and may even have stimulated some resistance.

scholarly journals The transport of atmospheric NO<sub>x</sub> and HNO<sub>3</sub> over Cape Town

2014 ◽  
Vol 14 (2) ◽  
pp. 559-575 ◽  
Author(s):  
B. J. Abiodun ◽  
A. M. Ojumu ◽  
S. Jenner ◽  
T. V. Ojumu
Keyword(s):  
South Africa ◽  
Air Pollution ◽  
Southern Africa ◽  
Cape Town ◽  
Atmospheric Pollutants ◽  
Atmospheric Conditions ◽  
High Concentration ◽  
Budget Analysis ◽  
The City ◽  
Pollution Events

Abstract. Cape Town, the most popular tourist city in Africa, usually experiences air pollution with unpleasant odour in winter. Previous studies have associated the pollution with local emission of pollutants within the city. The present study examines the transport of atmospheric pollutants (NOx and HNO3) over South Africa and shows how the transport of pollutants from the Mpumalanga Highveld, a major South African industrial area, may contribute to the pollution in Cape Town. The study analysed observation data (2001–2008) from the Cape Town air-quality network and simulation data (2001–2004) from a regional climate model (RegCM) over southern Africa. The simulation accounts for the influence of complex topography, atmospheric conditions, and atmospheric chemistry on emission and transport of pollutants over southern Africa. Flux budget analysis was used to examine whether Cape Town is a source or sink for NOx and HNO3 during the extreme pollution events. The results show that extreme pollution events in Cape Town are associated with the lower level (surface – 850 hPa) transport of NOx from the Mpumalanga Highveld to Cape Town, and with a tongue of high concentration of HNO3 that extends from the Mpumalanga Highveld to Cape Town along the south coast of South Africa. The prevailing atmospheric conditions during the extreme pollution events feature an upper-level (700 hPa) anticyclone over South Africa and a lower-level col over Cape Town. The anticyclone induces a strong subsidence motion, which prevents vertical mixing of the pollutants and caps high concentration of pollutants close to the surface as they are transported from the Mpumalanga Highveld toward Cape Town. The col accumulates the pollutants over the city. This study shows that Cape Town can be a sink for the NOx and HNO3 during extreme pollution events and suggests that the accumulation of pollutants transported from other areas (e.g. the Mpumalanga Highveld) may contribute to the air pollution in Cape Town.

scholarly journals Bioremediation of lead using bacterial isolates and study their plant relieving effect on wheat under metal contamination

2020 ◽  
Vol 35 (1-2) ◽  
Author(s):  
Prashakha J. Shukla ◽  
Vishwa R. Vyas
Keyword(s):  
Heavy Metal ◽  
Stress Condition ◽  
Inhibitory Concentration ◽  
Anthropogenic Activities ◽  
Wheat Plant ◽  
Cost Effective ◽  
Heavy Metal Resistance ◽  
Metal Resistance

Increasing concentration of heavy metals due to various anthropogenic activities is a serious problem. To overcome this issue, many chemical and physical methods are available but they are either directly or indirectly harmful to nature. By these methods more quality of chemicals are wasted. So, bioremediation is the best method to remove pollutants. It is an eco-friendly and cost-effective process. A low concentration of heavy metal is required to plant for their growth and metabolic process but at higher concentration, plants do not survive. With the use of microbes, we can survive plants at certain levels. During this work heavy metal tolerating microorganism was isolated and purified. Various tests were performed like staining, minimum inhibitory concentration, multiple heavy metal resistance, multiple antibiotic resistance, biochemical test, DNA isolation, in vitro examination of the wheat plant under the stress condition of lead (1000ppm).

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