ISSN 1995-4301(Print)
ISSN 2618-8406
(Online)
Current issues:
Online version of the journal
|
Select viewing optionsKinetic characteristics of the regenerative utilization process of the spent solution after chemical nickel plating |
||||
| M.A. Shumilova, N.E. Suksin | ||||
| Section: Methodology and research methods. Models and forecasts |
||||
| Galvanic production in terms of the degree of negative impact on the environment occupies a leading position in the global industrial production; therefore, the introduction of regenerative recycling technology is receiving increasing attention. The aim of the present work is to determine the kinetic characteristics of the precipitation reaction in a solution of nickel sulfate with sodium hydroxide to develop a technology for the regeneration utilization of spent solutions
of chemical nickel plating (SCNPS).
The object of the study was the spent solution of chemical nickel plating of one of the industrial enterprises of Izhevsk. The experiment was carried out in the temperature range 293–333 K at various concentrations of sodium hydroxide (1.25–2.60 M) and nickel sulfate (0.037–0.06 M). To determine the order of the reaction, we plot graphs in the coordinates lg w – lg C(Ni) using the experimental data, where w is the reaction rate. The tangent of the slope of the obtained linear dependences with a high degree of approximation (R2 = 0.98) is close to 2, therefore, the order of the reaction of the deposition of SCNPS with sodium hydroxide is second. With a graphical method for determining the rate constant of a second-order reaction for the dependence 1/С = f(t), the tangent of the slope of the straight line corresponds to the calculated parameter. In the investigated temperature range the rate constant takes values from 5·10-4 to 9·10-4 dm3·mol-1·s-1. The activation energy of the precipitation reaction, determined by the Arrhenius equation by graphic and calculation methods, is 16.57 kJ·mol-1 and 16.44 kJ·mol-1, respectively. The low values of Ea indicate a weak dependence of the reaction rate on temperature. Consequently, the introduction of the technology for the regeneration utilization of SCNPS will not entail large expenditures of energy resources for heating the reaction masses. |
||||
| Keywords: spent chemical nickel plating solution, sodium hydroxide, reaction order, reaction rate constant, activation energy |
||||
| Article published in number 4 for 2023 DOI: 10.25750/1995-4301-2023-4-044-051 |
||||
|
||||
Utilization of industrial wastes for sorption of toxic gases |
||||
| S.L. Fuks, S.V. Devyaterikova | ||||
| Section: Ecologization of industry |
||||
| The purification of exhaust gases of some industries by solid wastes of other enterprises is promising and up-to-date in environmental protection. This paper presents the research results on purification of waste gases from ammonia and benzene by wastes from thermal power engineering (fly ash) and chemical industry (secondary polytetrafluoroethylene).
Operation of heat power industry plants, which are powered by bituminous coal, results in producing fly ash which is to be stored in special ash ponds. Ash ponds occupy large areas and significantly burden the local ecosystem. Using ash in building, sound-absorbing, and heat insulating materials’ production reduces the volumes of ahs ponds. Fly ash can be used as a base for heterogeneous catalysts. Fly ash can also be used in zeolite production and for soil structure improvement. A number of studies provide positive results of wastewater treatment from oil products and heavy metal ions, as well as absorption of air sulfur(IV) oxide. We propose fly ash using as a sorbent for ammonia adsorbing from exhaust gases in nitric acid and nitrogen fertilizers production. The adsorbate can be applied as a fertilizer for acid soils. Secondary polytetrafluoroethylene is a co-product of polytetrafluoroethylene production. It can be converted into ultradisperse powder with particle sizes of 0.20–1.35 µm by method of exhaustive fluoridation; the powder applies to a sponge material. The resulting sorbent can be used to extract benzene vapors from the exhaust gases of industries using benzene, for example, as a solvent. Compared to activated carbon, the developed sorbent effectively removes benzene vapors from exhaust gases. Over time, the purification efficiency of heated gases decreases to almost zero. Presumably this is due to liquid benzene fraction condensation on the sorbent surface. |
||||
| Keywords: fly ash, polytetrafluoroethylene, activated carbon, adsorption, ammonia, benzene |
||||
  |
||||
| Article published in number 4 for 2023 DOI: 10.25750/1995-4301-2023-4-110-117 |
||||
|
||||
Russian-Myanmar cooperation in training national personnel in higher education institutions |
||||
| Hein Thu Aung, D.O. Lemeshev, A.V. Morzhukhin, А.V. Kolesnikov, V.A. Brodsky, I.V. Eremin | ||||
| Section: Information |
||||
| This article informs about the friendship and cooperation between the two countries of Russia and Myanmar in the field of international state diplomatic relations, military-technical cooperation and development in the field of training national personnel for the Republic of the Union of Myanmar in higher educational institutions of Russia. The article describes the achievements of MUCTR students from Myanmar in the direction of solving environmental problems in water purification, water treatment, industrial ecology and environmental protection and rational use of natural resources. | ||||
| Keywords: Russia, Myanmar, cooperation, water treatment, water preparation, in higher educational institutions |
||||
 |
||||
| Article published in number 4 for 2023 DOI: - |
||||
|
||||
Study of the efficiency of water treatment from ammonium ions by a calcined sorbent from ash-and-slag waste |
||||
| T.G. Korotkova, A.M. Zakolyukina, S.A. Bushumov | ||||
| Section: Ecologization of industry |
||||
| Experimental studies of sorption on water treatment from ammonium ions by a calcined sorbent based on ash-and-slag waste from thermal power engineering have been carried out. The calcined sorbent was obtained by calcining samples of ash-and-slag from coal combustion at the Novocherkassk State District Power Plant at a temperature of 600 оC for 30 min. The sorption capacity of a sorbent with a dose of 2.0 g per 50 mL of a model solution, a stirrer speed of 200 rpm, pH 7, and sorption time from 10 to 180 minutes was studied. The influence of the initial concentration of model solutions with the content of ammonium ions 5, 20, 50 and 100 mg/L on the amount of adsorption and treatment efficiency was studied. The highest treatment efficiency of 60% was obtained for an initial concentration of ammonium ions in a solution of 20 mg/L. Processing of experimental data was carried out according to the models of pseudo-first, pseudo-second-order and intra-particle diffusion kinetics. The best description of the experimental data was obtained using the pseudo-first order model, which has the highest value of the coefficient of determination. The adsorption equilibrium in the system ammonium ions – calcined sorbent was studied for the initial concentration of ammonium ions in solution: 5, 20, 30, 50, 100, 200, 300 mg/L. Processing of experimental data on equilibrium was carried out on the basis of two-parameter adsorption isotherms: Langmuir, Freindlich and Temkin. The value of the coefficient of determination according to the Langmuir isotherm is the largest R2 = 0.9904. Dependences between the cleaning efficiency at adsorption equilibrium and the initial concentration of ammonium ions in solution for the system ammonium ions – calcined sorbent are obtained. With an increase in the initial concentration of ammonium ions in the solution, the treatment efficiency at low initial concentrations increases, and decreases with increasing concentration. | ||||
| Keywords: treatment efficiency, ammonium ion, sorbent, ash-and-slag waste |
||||
| Link | ||||
| Article published in number 4 for 2023 DOI: 10.25750/1995-4301-2023-4-099-109 |
||||
|
||||
Comprehensive study of the content of biologically active substances in the destruction products of bark-wood waste generated during long-term storage |
||||
| T.I. Shirshova, I.V. Beshley, K.G. Ufimtsev | ||||
| Section: Ecologization of industry |
||||
| The study of the content of biologically active substances in the samples of the bark-wood waste destruction products (BWW) was continued. BWW were taken at a depth of 1 to 27 meters of the bark dump of OJSC Syktyvkar LDK, located in the Forestry microdistrict of Syktyvkar. The hexane-soluble substances content is in ranges from 0.78 to 1.89% of the dry mass of BWW. The minimum content was found in the first (0.24%) and last samples (0.21%) at the minimum and maximum depth, the maximum – in samples at a depth of 3 to 9 m (1.66–1.89%). The variation of the hexane extract (HE) content in BWW’s dry mass depending on the depth of occurrence is not clear.
The HE content in the dry ethyl acetate extract is mainly within 50%. The minimum content was found in the first sample at a depth of up to 1.5 m (34.9%), the maximum in the last sample at a depth of 27.0 m, where it reaches 66% of the dry weight of the ethyl acetate extract. The analysis of the obtained hexane extracts by thin-layer chromatography showed that the HE contains substances with a mobility coefficient of 0.61, which coincide with dihydroquercetin and some phenolic acids previously detected in ethyl acetate extracts. Six phenolic compounds were detected by high-performance liquid chromatography in hexane extracts. Protocatechic acid, vanillic acid, trans-p-coumaric acid and its cis isomer were identified by chromatographic and spectral characteristics. |
||||
| Keywords: bark and wood waste, ethyl acetate extracts, hexane extracts, flavonoids, quercetin, dihydroquercetin, phenolic acids |
||||
| Article published in number 4 for 2023 DOI: 10.25750/1995-4301-2023-4-091-098 |
||||
|
||||
Application of microbial biotechnologies to eliminate residues of herbicides of imidazolinone and sulfonylurea classes in soil (review) |
||||
| O.V. Kolotova, E.E. Nefedieva, I.R. Gribust, E.A. Sukhova, E.A. Zvada, V.V. Sheveleva | ||||
| Section: Theoretical problems of ecology |
||||
| The review is devoted to the problems of application of modern imidazolinone and ulfonylurea herbicides, as well as to the researches in the field of microbial iotechnology for remediation of contaminated soils. Data on the traits of the influence of residual amounts of herbicides from the classes of imidazolinones and sulfonylureas on target and subsequent crops in crop rotations are given in the article. The problems of monitoring of herbicide residues due to the variety of properties of components and decomposition mechanisms in the soil are shown. Ecological aspects of the influence of imidazolinones and sulfonylureas on soil microbiota and non-target organisms are considered. The results of studies of the biodegradation pathways of herbicide components, as well as conditions that contribute to the acceleration of destructive processes, are presented. The relevance of the search for microorganisms-destructors of imidazolinones and sulfonylureas for the production of biological products is substantiated. Microorganisms of different genera, such as Rhodococcus, Rahnella, Pseudomonas, Bacillus, Methylopila, Ancylobacter, Hansschlegelia, Klebsiella, and Arthrobacter, possess destructive potential against imidazolinones and sulfonylureas. The current data on the development of biological products to eliminate residues of imidazolinones and sulfonylureas in soils to reduce the phytotoxic effect are given. | ||||
| Keywords: herbicides, imidazolinones, sulfonylureas, soil microflora, biodestruction, microorganisms, biological products, soil remediation |
||||
| Article published in number 4 for 2023 DOI: 10.25750/1995-4301-2023-4-016-027 |
||||
|
||||
The study of the integral toxicity of oil-contaminated soil |
||||
| Yu.N. Kurbatov, T.A. Trifonova | ||||
| Section: Ecotoxicology |
||||
| The effect of contamination with technical waste oil on the integral toxicity of sod-podzolic sandy loam soil under field experiment conditions was studied. The integral toxicity of the soil aqueous extract was determined using the «Ecolum» bacterial test, which is a luminescent gene-engineered Escherichia coli. Control soil samples show acceptable levels of toxicity. Soils contaminated with 10 or 20 g/kg doses of petroleum products are moderately toxic. The dose of 30 g/kg makes the soil highly toxic for luminescent microorganisms. The hydrocarbon composition of technical waste oil was determined using spectral coefficients obtained by infrared spectrometry. High content – 6.73% – of aromatic hydrocarbons (the most toxic fraction) was revealed. Correlation analysis between the soil toxicity index, the content of oil products, heavy metals (Co, Ni, Cu, Zn, Pb) and the pH of the soil aqueous extract showed a very strong positive correlation between toxicity and zinc content (r = 0.88) and oil products content (r = 0.83) in the soil, as well as a high negative correlation on soil pH (r = –0.61). The phytomass of plants growing on contaminated sites was determined. A very high inverse correlation (r = –0.82) between the content of oil hydrocarbons in the soil and phytomass confirms that soil contamination with an increased dose of oil products reduces the biomass of the aboveground part of plants. A general tendency to displacement of monocots and their replacement by dicots was observed for polluted soils. | ||||
| Keywords: integrated soil toxicity, waste oil, hydrocarbon composition, heavy metals, phytomass |
||||
  |
||||
| Article published in number 4 for 2023 DOI: 10.25750/1995-4301-2023-4-141-150 |
||||
|
||||
Technological solutions and experience of industrial processing of liquid chromium-containing waste |
||||
| V.А. Brodskiy, A.V. Perfileva, Yu.O. Malkova, А.V. Kolesnikov, N.M. Makarova | ||||
| Section: Ecologization of industry |
||||
| Analysis of the list of liquid wastes of hazard classes I and II in the Federal Classification Catalog of waste (FCCW) showed that one of the most common wastes is wastewater, waste technological solutions containing chromium ions(III, VI). This type of waste accounts for up to 15% of the total amount of liquid technogenic waste of hazard classes I and II, formed as a result of the activities of electroplating and chemical enterprises. Hexavalent chromium compounds belong to the class of toxic, extremely dangerous substances, the maximum permissible concentration (MPC) in the water of drinking water bodies for chromium (VI) is 0.05 mg/L. A feature of this type of waste is the increased salt background characteristic of electrolytes used in electroplating industries.
The article presents experimental data, as well as basic technological solutions for the neutralization of chromium-containing wastewater and waste technological solutions. A technological scheme containing four main stages is proposed: reduction of hexavalent chromium, isolation of trivalent chromium from aqueous solutions, separation of accompanying compounds of heavy and non-ferrous metals, filtration post-treatment of the solution. Experimental studies have shown that, depending on the ionic composition of the medium, the efficiency of isolation of trivalent chromium compounds from aqueous solutions by electroflotation varies from 8 to 95%. The introduction of an anionic flocculant makes it possible to increase the degree of extraction to 99% or more. |
||||
| Keywords: industrial waste, wastewater, chromium(VI), chromium(III), heavy metal ions, technology, dispersed phase, flocculation, electroflotation, filtration |
||||
    |
||||
| Article published in number 4 for 2023 DOI: 10.25750/1995-4301-2023-4-125-134 |
||||
|
||||
The quality improvement and products expansion on technical monocalcium phosphate base |
||||
| I.A. Pochitalkina, I.M. Kostanov, I.B. Sibiryakova | ||||
| Section: Ecologization of industry |
||||
| Production of a low-grade phosphate raw materials-based line of products using economically and environmentally appropriate hydrochloric-phosphorus acid technology is a promising area. A double superphosphate (P2O5 = 46 wt. %) was obtained by isothermal re-crystallization due to removing iron(III) from impurities of the technical monocalcium phosphate (P2O5 = 35 wt. %). The obtained product is represented exclusively by a mobile (water-soluble) phosphorus form.
The development of greenhouses and requirements for closed soils impose strict restrictions on the impurities composition in the mineral fertilizers. The current State standards regulate such physico-chemical and physico-mechanical parameters of phosphorus-containing fertilizers as nutrients’ concentration, moisture content, pH of 10% solution, granulometric composition, granules’ strength, friability, heavy metals’ concentration. But they ignore a number of impurities, for example, iron(III), that can lead to phosphorus retrogradation. The simple enough technology makes it possible to obtain cheap effective product –monocalcium phosphate (MCP) – from low-grade ores (phosphorites). This explains the high demand for it among farmers. MCP can also be used in animal husbandry, provided that the sanitary regulations and norms requirements on MPC of controlled impurities are met. The development of the “Green Chemistry” involves the use of water-soluble fertilizers and eliminates the toxic elements content that can accumulate in the soil. The iron(III) extracted from impurity minerals binds to phosphorus and forms FePO4 with the citrate-soluble form of P2O5, thereby reducing its mobile form (P2O5 wat.) in the product. A more concentrated product corresponding to the double superphosphate in the main component (P2O5 wat.) content was produced by isothermal re-crystallization of MCP with ballast impurity. In addition, the final product was purified from iron compounds to trace amounts. Thus, purification of technical MCP by isothermal recrystallization method due to the removal of iron impurities to trace amounts expands the field of its application. |
||||
| Keywords: monocalcium phosphate, double superphosphate, purification, recycling technologies, re-crystallization |
||||
  |
||||
| Article published in number 4 for 2023 DOI: 10.25750/1995-4301-2023-4-135-140 |
||||
|
||||
Effects of atmospheric air pollutants on human health (overview) |
||||
| S.V. Raikova, Yu.S. Gusev, S.I. Mazilov, M.V. Pozdnyakov, N.E. Komleva, A.N. Mikerov | ||||
| Section: Theoretical problems of ecology |
||||
| One of modern humanity’s global scourges is air pollution on account not only of its influence on climate change but also its significant impact on public health. A review of current data on the effects of priority atmospheric air pollutants on human health was carried out. The search was performed using eLIBRARY.RU, Web of Science, Scopus and PubMed, in a time span of 2017–2022. Particulate matter (with a diameter of 2.5 μm (PM2.5) or less and 10 μm (PM10) or less) and nitrogen dioxide (NO2) were the most widely investigated pollutants in the context of health effects. Recently, however, there has been growing interest in the health effects of ozone. Despite the fact that most of the works were devoted to the study of the influence of pollutants on the respiratory and cardiovascular systems, recently the vector of scientific interests shifted to determine the possible role of pollutants in the formation of mental disorders, pathologies of central nervous and endocrine systems, reproductive function. Data on the association of prolonged exposure to nitrogen dioxide, PM2.5, carbon monoxide and ozone with increased morbidity and mortality from SARS-CoV-2 were provided. Prolonged exposure to concentrations well below current standards has been found to have a significant negative impact on the health of both adults and children. Further research in this area is needed to address the possible correction of modern air quality standards. | ||||
| Keywords: pollutants, atmospheric air, human health, morbidity |
||||
| Article published in number 4 for 2023 DOI: 10.25750/1995-4301-2023-4-006-020 |
||||
|
Pages: previous 1 2 3
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
|
|||||
|
36, Moskovskya street, Kirov, 610000, Editorial Board "Theoretical and Applied Ecology." Phone/fax: (8332) 37-02-77 e-mail: envjournal@vyatsu.ru The journal was founded in 2007 |
||||||
