scholarly journals Investigation of formation processes of drainage waters chemical contamination with nitrogen compounds on the example of major mining enterprise

2016 ◽  
pp. 35-40
Author(s):  
A. V. Hohryakov ◽  
◽  
A. G. Studenok ◽  
G. A. Studenok ◽  
◽  
...  
Keyword(s):  
Nitrogen Compounds ◽  
Formation Processes ◽  
Chemical Contamination ◽  
Mining Enterprise ◽  
Drainage Waters

scholarly journals Influence of climatic and hydrodynamic factors on the quarry water purification process from nitrogen compounds

2020 ◽  
Vol 177 ◽  
pp. 04008
Author(s):  
Alexander Khokhryakov ◽  
Gennady Studenok ◽  
Andrey Studenok ◽  
Alexander Olkhovsky ◽  
Vladimir Boltyrov
Keyword(s):  
Treatment Method ◽  
Open Pit ◽  
Nitrogen Compounds ◽  
Purification Process ◽  
Open Pit Mines ◽  
Mining Enterprise ◽  
Water Conditioning ◽  
Promising Treatment ◽  
Hydrodynamic Factors ◽  
Drainage Waters

The nitrogen compounds, namely ammonium, nitrite and nitrate nitrogen, are the main substances polluting the quarry and drainage waters of mining enterprises that use the ammonium nitrate-based explosives for drilling-and-blasting rock mass preparation. In accordance with the legislation, such waters are subject to treatment prior to discharge into the water bodies. At the mining enterprises, the promising treatment method is the treated water conditioning in the flooded abandoned open-pit mines, during which the natural microbiological nitrification of ammonium and nitrite nitrogen contained in the quarry drainage waters is performed with an efficiency of more than 95%. The article discusses the influence of natural climatic and hydrodynamic factors on the nitrification process according to the results of a purification process study that has been performed since 2014 until the present time at a large mining enterprise. The relevant conclusions and recommendations are given.

The choice of a method for protecting the environment from pollution when mining asbestos-containing ore

2020 ◽  
pp. 66-71
Author(s):  
A. V. Khokhryakov ◽  
G. A. Studenok ◽  
A. G. Studenok ◽  
A. M. Olkhovsky
Keyword(s):  
Negative Impact ◽  
Raw Materials ◽  
Open Pit ◽  
Nitrogen Compounds ◽  
Chrysotile Asbestos ◽  
Natural Factors ◽  
Mine Workings ◽  
The Relationship ◽  
Drainage Waters

The article analyzes the mechanism of contamination of quarry waters during drilling and blasting preparation of asbestos-containing raw materials under the influence of man-made and natural factors, which can serve as a basis for making specific technological decisions that reduce the negative impact on the environment during the development of chrysotile-asbestos deposits. The dependence of the intake of nitrogen compounds in quarry waters on the consumption of explosives and the volume of formation of quarry waters is presented. The article shows the possibility of using the purification of quarry water in the spent open mine workings, the sides of which are composed of plastic asbestos-containing rocks. The relationship between the volumes of internaldumping and contamination of open pit drainage waters is analyzed.

scholarly journals Aquatic macrophytes as indicators of heavy metal pollution of water in DTD canal system

2003 ◽  
pp. 51-60 ◽  
Author(s):  
Slobodanka Pajevic ◽  
Mirjana Vuckovic ◽  
Zarko Kevresan ◽  
Milan Matavulj ◽  
Snezana Radulovic ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Littoral Zone ◽  
Aquatic Macrophytes ◽  
Chemical Pollution ◽  
Ceratophyllum Demersum ◽  
Chemical Contamination ◽  
Canal System ◽  
Almost All ◽  
Agricultural Areas ◽  
Drainage Waters

The aim of this investigation was to establish the presence or absence of chemical contamination of water and the littoral zone (banks) of Danube-Tisza-Danube (DTD) canal system. The investigation covered the canal section from Bezdan to Prigrevica. By analyzing the chemical composition of dominant aquatic species in four locations of the section, we defined the species with the highest capacity to accumulate nutrients and heavy metals. Concentrations of P and K as well as of a beneficial element Na in the tissues of the analyzed macrophytes were both species- and site-dependent. The highest accumulation was registered for Ceratophyllum demersum while the species Elodea canadensis showed increased P and K accumulation values in the location Sombor. The lowest concentrations of almost all heavy metals were recorded near Sombor, indicating that this section suffered the lowest chemical pollution. Highest concentrations of all of the analyzed heavy metals were recorded in the tissue of Ceratophyllum demersum from the location Prigrevica, possibly due to the influx of polluted drainage waters from surrounding agricultural areas as well as industrial wastewaters. The obtained results showed that the enforcement of biomonitoring and analyses of other parameters indicative of ecosystem conditions might be useful for improved protection of areas experiencing a strong human impact.

scholarly journals Accumulation of heavy metals in the soil – plant system in areas with the developed mining industry

2021 ◽  
Vol 100 (11) ◽  
pp. 1203-1208
Author(s):  
Guzel R. Allayarova ◽  
Tatiana K. Larionova ◽  
Rustem A. Daukaev ◽  
Svetlana R. Afonkina ◽  
Elvira A. Aukhadieva ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Soil Cover ◽  
Chemical Elements ◽  
Anthropogenic Load ◽  
Vegetable Crops ◽  
Chemical Contamination ◽  
Plant System ◽  
Mining Enterprise ◽  
Vegetable Products ◽  
Zone Of Influence

Introduction. The proximity of mining enterprises to settlements contributes to the pollution of the soil cover with heavy metals. Crops grown in garden plots accumulate chemical elements and are an intermediate link in the “soil - plant - human” chain. Purpose of the work. Assessment of the level of anthropogenic load on the territory adjacent to the mining enterprise, based on the study of the translocation of metals in the soil - plant system. Materials and methods. For the purpose of hygienic assessment of the chemical composition of the soil and vegetable products grown on it, the content of 7 microelements was determined by atomic absorption spectrometry. With the help of the coefficient of concentration of a chemical substance (Kc) and the total indicator of pollution (Zc), the level of chemical contamination of soils was determined. Using the total coefficient of anthropogenic load (Ka.n. = ∑Ci/PDUi), the territory was ranked according to the contamination of vegetables with toxic elements. The rate of accumulation of metals by vegetable crops was assessed by the coefficient of biological absorption (Ax) and the index of biochemical activity of the species (BAS). Results. The soil cover in the district is contaminated with a complex of metals, the content of gross forms of which exceeds the MPC by up to 1.9 times, mobile - up to 4.6 times. At a distance of up to 5 km around the mining enterprise, the maximum indicators of the total soil pollution (Zc = 44-65) have been established. Lead and zinc are elements of “biological accumulation” for all types of studied vegetable products grown in the zone of influence of the mining enterprise; cadmium is additionally concentrated in beets and carrots, and nickel in carrots. In vegetable samples, exceeding the permissible levels of cadmium and lead was noted. The most significant accumulation of heavy metals was found in the southern, southeastern, northern and northwestern directions from emissions. Conclusion. To eliminate the toxic effects of heavy metals in vegetables produced in the zone of influence of mining enterprises, it is recommended to include additional monitoring of nickel and zinc content in the social and hygienic monitoring system.

I Like Her, Because I Like Myself: Self-Evaluation as a Source of Interpersonal Attitudes

2003 ◽  
Vol 50 (4) ◽  
pp. 239-246 ◽  
Author(s):  
Eva Walther ◽  
Claudia Trasselli
Keyword(s):  
Opposite Effect ◽  
Learning Phase ◽  
The Self ◽  
Attitude Formation ◽  
Formation Processes ◽  
False Feedback ◽  
Self Evaluation ◽  
Evaluation Group ◽  
Group A ◽  
The Difference

Abstract. Two experiments tested the hypothesis that self-evaluation can serve as a source of interpersonal attitudes. In the first study, self-evaluation was manipulated by means of false feedback. A subsequent learning phase demonstrated that the co-occurrence of the self with another individual influenced the evaluation of this previously neutral target. Whereas evaluative self-target similarity increased under conditions of negative self-evaluation, an opposite effect emerged in the positive self-evaluation group. A second study replicated these findings and showed that the difference between positive and negative self-evaluation conditions disappeared when a load manipulation was applied. The implications of self-evaluation for attitude formation processes are discussed.

Chemical Contamination of Brain Development

1988 ◽  
Vol 33 (11) ◽  
pp. 992-993
Author(s):  
Bernard Weiss
Keyword(s):  
Brain Development ◽  
Chemical Contamination

On Beginning to Become Dietitians

2014 ◽  
Vol 2 (1) ◽  
pp. 8
Author(s):  
Debbie MacLellan ◽  
Jacqui Gingras ◽  
Daphne Lordly ◽  
Jennifer Brady
Keyword(s):  
Identity Formation ◽  
Professional Socialization ◽  
Early Years ◽  
Formation Processes ◽  
Socialization Process ◽  
Complex Process ◽  
The Future

This paper explores beginning dietetic practitioners’ perspectives on the process of becoming dietetics professionals through the use of vignettes to illuminate the complex process of professional socialization.  Embedded in these vignettes are three themes related to the socialization process that occurs in the early years of dietetic practice: congruence, resilience, and relationships.  Our findings indicate that new dietitians struggle to develop their dietitian identity.  They feel unprepared for the relational and practice realities of the workplace and find the transition from dietetic intern to dietitian challenging.  They seek many ways to cope including seeking support from others and planning for the future but some consider leaving the profession.  It is important to understand the professional socialization and identity formation processes that occur during the early years of practice to ensure that dietitians feel prepared and supported as they begin their careers.

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