Soil Surface Pollution with Heavy Metals Caused by Coal-Fired Boilers

2017 ◽  
Author(s):  
Jolita Braduliene ◽  
Ieva Sveikauskaite
Keyword(s):  
Heavy Metals ◽  
Environmental Pollutants ◽  
Chemical Properties ◽  
Soil Surface ◽  
Weather Conditions ◽  
Ambient Air ◽  
Long Term Storage ◽  
Environment Exposure ◽  
Prevailing Wind Direction

One of the goals for environmental experts is to help avoid, prevent or reduce harmful effects on human health and the environment as a whole. The idea is that the public and the polluting companies would be informed of the effects of pollutants on humans, flora and fauna. To realize this goal are carrying out environmental monitoring, investigations and an-alysed the results. The aim of this work is to evaluate JSC „Nemencines komunalininkas“ boiler-No. 9 resulting air pollution. Company is lo-cated in Vilnius region. The focus is on long-term emissions, e.g. heavy metals (HM), the accumulation on the soil surface to examine boiler-No. 9 impact on the area and assessing the long-term impact on ambient air quality. Soil samples was taken by the principle of the envelope in 11 selected locations 50–300 meters around the boiler area, using non-colour, non-grease, stainless steel tools. Examination of heavy metals in the soil solution, to get the actual data on the amount of HM and their distribution in the soil around the coal-fired boiler territory. Pollutants into the environment, exposure depends on many physical and geochemical processes. Environmental pollutants distribution describes not only the various environmental processes, physical and chemical properties of materials but also the weather conditions. Carryover assessed the prevailing wind direction, as well as simulated through forecast of the largest concentrations of locations. To assess of the boiler No. 9 environmental impact of selected air pollutants was choose in long-term storage medium (soil).

scholarly journals Excretion of Heavy Metals and Glyphosate in Urine and Hair Before and After Long-Term Fasting in Humans

2021 ◽  
Vol 8 ◽  
Author(s):  
Franziska Grundler ◽  
Gilles-Eric Séralini ◽  
Robin Mesnage ◽  
Vincent Peynet ◽  
Françoise Wilhelmi de Toledo
Keyword(s):  
Heavy Metals ◽  
Environmental Pollutants ◽  
Dietary Exposure ◽  
The Body ◽  
Health Concern ◽  
Obese People ◽  
Clinical Trial Registration ◽  
Reduced Body ◽  
Before And After

Background: Dietary exposure to environmental pollutants in humans is an important public health concern. While long-term fasting interrupts the dietary exposure to these substances, fat mobilization as an energy source may also release bioaccumulated substances. This was, to our knowledge, only investigated in obese people decades ago. This study explored the effects of 10-days fasting on the excretion of heavy metals and glyphosate.Methods: Urinary levels of arsenic, chromium, cobalt, lead, nickel, mercury and glyphosate were measured before and after 10 fasting days in 109 healthy subjects. Additionally, hair analysis was done before and ten weeks after fasting in 22 subjects.Results: Fasting caused a decrease in body weight, and in urinary arsenic (by 72%) and nickel (by 15%) concentrations. A decrease in lead hair concentrations (by 30%) was documented. Urinary mercury levels were unchanged for chromium, cobalt and glyphosate, which were undetectable in most of the subjects. Additionally, fatigue, sleep disorders, headache and hunger were reduced. Body discomfort symptoms diminished four weeks after food reintroduction.Conclusions: The results of this study provide the first insights into the changes in heavy metal excretion caused by long-term fasting. Further studies focusing on the kinetics of efflux between different compartments of the body are needed.Clinical Trial Registration:https://www.drks.de/drks_web/navigate.do?navigationId=trial.HTML&TRIAL_ID=DRKS00016657, identifier: DRKS00016657.

scholarly journals Physicochemical uptake and release of volatile organic compounds by soil in coated-wall flow tube experiments with ambient air

2019 ◽  
Vol 19 (4) ◽  
pp. 2209-2232 ◽  
Author(s):  
Guo Li ◽  
Yafang Cheng ◽  
Uwe Kuhn ◽  
Rongjuan Xu ◽  
Yudong Yang ◽  
...  
Keyword(s):  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Atmospheric Chemistry ◽  
Soil Surface ◽  
Ambient Air ◽  
Flow Tube ◽  
Heterogeneous Oxidation ◽  
Volatile Organic ◽  
Wall Flow

Abstract. Volatile organic compounds (VOCs) play a key role in atmospheric chemistry. Emission and deposition on soil have been suggested as important sources and sinks of atmospheric trace gases. The exchange characteristics and heterogeneous chemistry of VOCs on soil, however, are not well understood. We used a newly designed differential coated-wall flow tube system to investigate the long-term variability of bidirectional air–soil exchange of 13 VOCs under ambient air conditions of an urban background site in Beijing. Sterilized soil was investigated to address physicochemical processes and heterogeneous/multiphase reactions independently from biological activity. Most VOCs revealed net deposition with average uptake coefficients (γ) in the range of 10−7–10−6 (referring to the geometric soil surface area), corresponding to deposition velocities (Vd) of 0.0013–0.01 cm s−1 and soil surface resistances (Rc) of 98–745 s cm−1, respectively. Formic acid, however, was emitted at a long-term average rate of ∼6×10-3 nmol m−2 s−1, suggesting that it was formed and released upon heterogeneous oxidation of other VOCs. The soil–atmosphere exchange of one individual VOC species can be affected by both its surface degradation/depletion caused by surface reactions and by competitive uptake or heterogeneous formation/accommodation of other VOC species. Overall, the results show that physicochemical processing and heterogeneous oxidation on soil and soil-derived dust can act as a sink or as a source of atmospheric VOCs, depending on molecular properties and environmental conditions.

scholarly journals Effect of Cultivar, Controlled Atmosphere Storage, and Fruit Ripeness on the Long-term Storage of Highbush Blueberries

2008 ◽  
Vol 18 (2) ◽  
pp. 199-205 ◽  
Author(s):  
Jim Hancock ◽  
Pete Callow ◽  
Sedat Serçe ◽  
Eric Hanson ◽  
Randy Beaudry
Keyword(s):  
Ambient Air ◽  
Controlled Atmosphere ◽  
Storage Quality ◽  
Controlled Atmosphere Storage ◽  
Long Term Storage ◽  
Significant Difference ◽  
Highbush Blueberries ◽  
Atmosphere Storage ◽  
Resistant Genotypes

Controlled-atmosphere storage had little effect on the quality of fruit of eight cultivars held under 2 kPa oxygen (O2) and 8 kPa carbon dioxide (CO2) versus ambient air. ‘Elliott’ fruit harvested from bushes with only 30% ripe fruit had significantly better storage quality than fruit picked later; however, there was no significant difference in the storage life of fruit that was stored fully blue versus partially green. Fruit from the first harvest of four cultivars had superior storage quality to that of the second. In one comparison of the long-term storability of nine cultivars, ‘Bluegold’, ‘Brigitta’, and ‘Legacy’ performed the best, storing for 4 to 7 weeks. In another postharvest trial of 17 cultivars, ‘Brigitta’ stored the longest (8 weeks) followed by ‘Aurora’ and ‘Draper’ (7 weeks). The most resistant genotypes to Alternaria spp. were ‘Brigitta’, ‘Aurora’, ‘Elliott’, and ‘Draper’, whereas the most resistant genotypes to Colletotrichum spp. were ‘Elliott’, ‘Brigitta’, ‘Toro’, ‘Draper’, and ‘Bluejay’.

scholarly journals Bioremediation of Chromium Contaminated and Harbor Dredged Soil

2019 ◽  
Vol 8 (6S4) ◽  
pp. 875-879
Keyword(s):  
Heavy Metals ◽  
Uv Spectroscopy ◽  
Environmental Pollutants ◽  
Chemical Properties ◽  
Sem Analysis ◽  
Natural Soil ◽  
Sieve Analysis ◽  
Dredged Soil ◽  
Micro Organisms ◽  
Remediation Of Soil

Soil contamination is caused by the presence of manmade chemicals in the natural soil environment. It is often caused by some form of industrial activity, agricultural chemicals or the improper disposal of waste. The most common chemicals involved in soil pollution are petroleum hydrocarbons, pesticides and lead and other heavy metals. Heavy metals are among the major environmental pollutants and the accumulation of these metals is a great concern in agricultural production due to the toxic effects it has on crop growth. Remediation of soil is a challenging process but if done perfectly it can yield very good results. Firstly the physical and chemical properties of the soil are tested for understanding the properties of the soil. Test such as sieve analysis, liquid and plastic limit are done to understand the characteristics of the soil. The contaminants and their concentration in the soil can be identified using SEM ANALYSIS and EDAX. The soil is remediated using purpose which suits the nature of the soil. Remediation of soil can be done using either micro organism, chemicals, plants, by passing high voltage current or by other physical purposes. Use of micro organisms is one of the advanced methods of remediation. Micro organisms such as pseudomonas aeruginosa, pseudomonas alcaligenes, and pseudomonas hibisciola are used for remediating the heavy metals of the soil. The micro organisms are inoculated in the contaminated soil and tests such as pH, temperature, UV spectroscopy 620 nm are conducted to understand the effect of micro organisms on the soil. Atomic Absorption Spectroscopy is finally conducted for the 0th hour and 100th hour to understand the amount of heavy metal reduction in the soil samples.

scholarly journals Method for predicting the dissemination of hazardous substances in the soil during long-term storage of galvanic waste

2022 ◽  
pp. 12-22
Author(s):  
Larisa Tretiakova ◽  
Liudmyla Mitiuk ◽  
Igor Panasiuk ◽  
Elina Rebuel
Keyword(s):  
Heavy Metals ◽  
Mathematical Model ◽  
Soil Salinity ◽  
Molecular Diffusion ◽  
Hazardous Substances ◽  
Depth Of Penetration ◽  
Long Term Storage ◽  
Harmful Substances ◽  
Term Storage

The problem of production waste storage in open areas of an enterprise with a galvanic shop for the production of chips and microchips has been investigated. The composition of the sludge obtained after sewage treatment of the production of the copper line was investigated. The aim of the article is to develop a mathematical model for predicting the distribution of compounds with heavy metals in the soil during long-term storage of galvanic sludge in open areas. Modeling the process of movement of salts from the earth's surface into the lower layers of the aeration zone occurs according to the laws of molecular diffusion. The method is developed on the basis of a mathematical model that makes it possible to estimate the spread over the depth of the ground and level of soil salinity over time using initial information about soil structure and its characteristics (molecular diffusion coefficient, volume humidity), annual volumes and conditions of sludge storage in the enterprise. Restrictions are set: the presence of harmful substances on the soil surface with a concentration that exceeds the permissible level; inadmissibility of harmful substances to aquifers. The practical use of the method made it possible to identify the main dangers during long-term storage of galvanic waste in open areas. The dynamics of soil salinity levels and the depth of penetration of heavy metals increase over twenty years of conservation has been determined, as well as the possibility of hazardous compounds entering groundwater has been assessed. Polyvinyl chloride packaging has a maximum life span of 15 years. Waste should not be stored in packages and in closed areas for more than 10 years. According to the prediction results, it can be stated that storage in landfills of galvanic waste for more than 15 years leads to significant salinization of the soil and creates conditions for an emergency situation, which is caused by harmful substances entering the water horizons. Recommendations for improving storage conditions are given and the need for recycling of industrial waste is substantiated

Development of a Device for Detecting Helium Leaks From Canisters: Part 2 — Numerical Analysis of Temperature Behavior During Gas Leaks From a Canister of a 1/4.5 Scale Cask Model

2018 ◽  
Author(s):  
Kosuke Shimizu ◽  
Hirofumi Takeda ◽  
Masanori Goto
Keyword(s):  
Heat Transfer ◽  
Internal Pressure ◽  
Ambient Air ◽  
Ideal Gas ◽  
Helium Pressure ◽  
Leak Detector ◽  
Long Term Storage ◽  
Sealing Performance ◽  
Term Storage

In the concrete cask, the canister is sealed with lids by welding, and has high sealing performance. But considering long-term storage, there is a concern about loss of the sealing performance due to stress corrosion cracking (SCC). In the concrete cask, unlike the metal cask, it is not mandatory to constantly monitor helium pressure between the lids. However, it is useful from the viewpoint of improving safety during the long-term storage to install a helium leak detector in the canister inside the concrete cask. Currently, we are developing the leak detector utilizing the phenomenon that the surface temperature of the canister changes when helium leaks out of the canister. As part of developing the leak detector of the canister, leak tests were performed using a small canister model as a pressurized vessel and a 1/4.5 scale cask model of the actual cask including the canister. This leak detector utilized the phenomenon that canister bottom temperature (TB) increases and canister lid temperature (TT) decreases when the internal pressure of the canister decreases. In computational fluid dynamics (CFD) calculation, focused on this phenomenon, the influence of the internal pressure and physical properties of internal gas in the canister were examined by calculating conditions of three kinds of pressure and two types of gas (air and helium). The main purpose of the CFD calculation was to confirm the results of the experiment, and we grasped the phenomenon occurring in the canister and elucidated its mechanism. For the CFD calculation, a commercial CFD software, STAR-CCM+® (ver.12.06.010) by Siemens PLM Software Company, was used. A CAD file used for the calculation simulated also the shape inside the canister (e.g. basket, fuel rods). A polyhedral mesh was used for a calculation mesh. In the small canister model, a mesh of its ambient air was not generated, and heat transfer between the canister surface and the ambient air was calculated from a heat transfer correlation equation. On the other hand, in the 1 / 4.5 scale cask model, the mesh of its ambient air was generated, so that the heat transfer on the surface of the canister was calculated according to the actual heat transfer phenomenon. The internal gas and the ambient air of the canister were ideal gas, and buoyancy due to density change was taken into consideration. A realizable k-epsilon model was used for a turbulence model, and a DO model was used for a radiation model.

Technology and organization of storage of combine harvesters

2021 ◽  
pp. 9-17
Author(s):  
N. M. Morozova
Keyword(s):  
Chemical Properties ◽  
Long Term Storage ◽  
Scientific Task ◽  
Atmospheric Factors ◽  
Combine Harvesters ◽  
Physical And Chemical ◽  
Technical And Organizational Measures ◽  
Term Storage ◽  
And Chemical Properties

During long-term storage, climatic and atmospheric factors affect the agricultural machine, which cause changes in the physical and chemical properties of structural materials, technical fluids, lubricants. Therefore, the development of technical and organizational measures related to improving the storage efficiency of combine harvesters is an urgent scientific task that the leading scientific institutes of the country are engaged in.

Modern methods to reduce evaporation and ensure safety when storing petroleum products in tanks

2021 ◽  
Vol 94 ◽  
pp. 65-75
Author(s):  
A. M. Kuzminskaya ◽  
◽  
M. V. Buzaeva ◽  
O. V. Ageeva ◽  
◽  
...  
Keyword(s):  
Negative Impact ◽  
Fire Hazard ◽  
Chemical Properties ◽  
Petroleum Products ◽  
Oil Refining ◽  
Chemical Additives ◽  
Long Term Storage ◽  
Main Components ◽  
Term Storage

Introduction. With long-term storage of gasoline in large-capacity tanks, the problem associated with their volatility becomes urgent. Evaporation of petroleum products and gasoline leads to a change in their physical and chemical properties, a decrease in the yield of light petroleum products during oil refining, and a deterioration in the performance characteristics of engines. In this regard, it becomes difficult to start engines, their reliability, fuel consumption increases and the service life is reduced. Lost light hydrocarbons pollute the environment and increase the fire hazard of enterprises. The aim of the work is to identify effective, inexpensive and safe methods for reducing the volatility of oil products, including gasoline, when stored in tanks. Research methods. A retrospective analysis of studies on the problems of reducing losses of petroleum products during their storage, transportation and use is carried out. Technical and organizational methods for reducing the evaporation of fuels and the use of chemical additives as an inexpensive and effective method for solving the problem of the volatility of gasolines are considered. The conclusion about the efficiency of using chemical additives to fuels to reduce volatility has been substantiated. Results and their discussion. Conclusions are made about the possibility of using surfactants as additives to reduce the evaporation of gasolines during long-term storage in tanks. The analysis of the main components and methods for the synthesis of surfactant compositions capable of creating a surfactant film at the liquid-atmosphere interface, which protects the liquid from evaporation. Conclusion. Reducing the volatility of gasoline with the use of inexpensive and effective additives introduced into the fuel in small quantities, not only reduces the explosion and fire hazard during storage in large tanks, reduces losses, but also prevents the negative impact on the environment from the ingress of low molecular hydrocarbons into it. Key words: volatility of petroleum products, losses during storage of gasoline, methods of reducing volatility, additives.

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