نشریه علوم و تکنولوژی محیط زیست
سال بیست و سوم شماره 12 (پیاپی 115، اسفند 1400)

Given that in today's world, factors such as population growth, increasing efforts to achieve economic growth and production systems to increase production and achieve competitive advantage lead to the loss of natural resources, global warming, climate change, Natural disasters and ultimately environmental degradation and green production has been proposed as an effective factor in reducing environmental pollution and human risks as well as increasing competitive advantage and profitability for organizations. This study aims to design a conceptual model of green production with a modeling approach. An interpretive structure has been developed.

In this study, which is synthetic and inductive-deductive in terms of data collection method, and was conducted in 1400, and 12 industrial management specialists at the university level participated as panel members in the quality department. In fact, in the qualitative section, which used meta-synthesis and Delphi analysis, the aim was to identify the themes of green production and then in the quantitative section, with the participation of 16 managers of knowledge-based companies in the green production section, the propositions identified in ISM templates should be graded based on influential priority. Therefore, relying on meta-synthesis analysis, the first 12 studies were reviewed as a basis for evaluation to determine the themes of green production based on critical evaluation, based on which eight themes were selected and entered into Delphi analysis in a checklist manner to determine theoretical adequacy. During the two stages of Delphi analysis, all eight identified themes of green production entered the quantitative analysis section, i.e., structural interpretive analysis.

The results showed that the most influential components of green production of knowledge-based companies are the five components of water (C1), energy (C2), natural resources (C3), capital (C5), and labor (C6), which is at the third level of the proposed model. Also, a Mick Mac analysis as a complementary interpretive structural analysis was performed to better understand the research topic.

The results showed that the factors of energy consumption, water consumption, labor, capital, and raw materials are important factors that any change in them will cause changes in other variables and on the other hand, GDP is with the low impression, and greenhouse gases and technology is the most impression variable.

Existing of brackish and polluted drainage is one of the environmental problems in the southern Iran region, and also many of these drainages move down to the local wetlands. So the aim of this study was B remediation from three aqueous solutions with different salinities, by two native hydrophytes of Iran’s southern wetlands.

In this study, during 120 hours treatment of waters with distinct salinity that contaminated with four different B levels (1, 2, 5, and 10 mg per liter of water), B remediation by two hydrophytes (Zannichellia palustris L. and Ruppia maritima L.) were examined.

The study showed for non-saline water plant uptake a high amount of B and both plant removal efficiency achieved more than 70%. The uptake index of Z. palustris and R. maritima respectively were 0.51 – 8.16 and 0.18 – 8.14 mg pot-1 but these values increased in the saline waters. Biomass production measurement of Z. palustris decreased by increasing B contamination but R. maritima was not affected, and it showed the higher B tolerance of R. maritima.

Totally, Z. palustris removed more B than R. maritima but the bad effect of salinity on R. maritima less than Z. palustris. The results approved the ability of both plants for B remediation in saline waters.

Natural gas produced from oil and gas wells often contains hydrogen sulfide and carbon dioxide, which are so-called “sour gasses”. Carbon dioxide (in large quantities) and hydrogen sulfide (even in small quantities) cause many problems during the transmission and consumption of natural gas. In this study, mathematical model for the separation of carbon dioxide and hydrogen sulfide from helium has been investigated with two different membrane species including a ceramic modulus and PEEK-L II and ionic liquids.

The effect of material, diameter, pressure and temperature on separation efficiency has been investigated. The ionic liquid used in this study is [hemim] [BF4]. The ceramic and PEEK-L II was studied. The pressure and concentration during absorption is investigated. The concentration variations of carbon dioxide and hydrogen sulfide in ionic fluid were investigated in time.

For a ceramic modulus, about 50 to 60% of the pressure drop occurs in the first 100 to 120 seconds. For the PEEK-L II modulus, in the first 30 seconds, about 50 to 60% of the pressure drop occurs due to gas absorption. The effect of temperature on the concentration of carbon dioxide and hydrogen sulfide at three temperatures of 25, 50 and 100 °C was investigated. As the temperature rises in the ceramic modulus, the amounts of carbon dioxide and hydrogen sulfide, passing through the membrane, increase.

As the time increases, the concentrations of carbon dioxide and hydrogen sulfide in the ionic fluid are increasing. With increasing temperature from 25 to 100 ° C, the amount of absorbed acidic gases into ionic liquid was increased. The PEEK-L II modules removed more acidic gases than the ceramic modules.

In the present era that a variety of changes in the natural environment has been created, we are obliged to plan and manage land on the basis of the actual and potential of study areaʼs land to achieve sustainable development. The aim of this study is to evaluate the ecological potential for agriculture, range management and determine the consistency of current account agriculture, range management with ecological potential users of this area.

In this research, first by looking at the different sources and standards, criteria and sub-criteria were selected. The main criteria used in this study include: Soil maps, geology, topography, climate, vegetation, water and land use. Then, layers were evaluated by designing and distributing questionnaires and were weighed by AHP and binary comparison matrix. Finally, all the layers were combined using a weighted linear combination method and the final ecological map can be obtained.

In the final map for the development of agriculture and pasture lands that were taken in 1394, there is not classes 1, 2 and 7of agriculture - range management applications in the final map of these users because the topography, over the rest of the criteria limits the possibility of the agricultural grade 1 and 2 in the study area and from the perspective of range management standards, to the 3rd floor can be seen in the study area. Agricultural Grade 3 is the highest with 31.9% and pasture Grade 3 is the lowest with 11.5% of the land proportion .

The findings suggest that the combination of AHP and GIS has a high potential for ecological capability evaluation of land for agricultural - range management applications and given that Tajyar dam basin has the potential to develop agricultural activities and pasture In case of exploitation in line with the ecological, local people will be benefited from the effects of the economic expansion of these activities.

International Environmental Law, which is a Branch of public International Law, is Primarily Based on Preventive and Precautionary Measures, and its Ultimate Goal is to protect the Global Environment from Pollution and Damage to Human Health. The Principle of Deterrence is a Fundamental and Universal Rule in Development-Oriented and Sustainable Policies Related to the Exploitation of Natural Resources and Ecological Aspects of Countries, Which on the one Hand Focuses on Pollution Prevention and Precautionary Measures in the Face of the Environment and Natural Resources. On the Other Hand, it includes Systematic Protection Measures and the Cooperation of Countries and Other Persons under International Law with Regard to Environmental Activities and the Exploitation of Natural Resources, Under National Sovereignty and Jurisdiction. Therefore, Violation of the Principle of Deterrence, Due to the Limited Environmental Resources and the Long Process of its Replacement, Leads to Improper Use of Natural Resources and Causes Numerous Damages to Environmental Components, Including Water, Air, Soil, Plants, Wildlife, etc. Which are Sometimes Irreparable and Ultimately Threaten Human Life and Health, Although Repairing the Damage and Compensation Requires Exorbitant Costs and Long Periods of Time, Sometimes Intergenerational

Particulate matter is one of the main air pollutants, especially in developing countries. Due to their small diameter, some of these particles are absorbed by the body and eventually entered the human circulatory or respiratory system. Since incomplete combustion of fuels are the main source of particulate matter, car occupants are particularly exposed to this pollution, especially in large city traffic. Therefore, the present study was conducted to evaluate the commercial filters in various vehicles in terms of the absorption of particulate matter less than 2.5 microns (PM2.5). Then polyacrylonitrile nanofiber and its composite with nano-chitosan were used to improve the ability to remove suspended particles by these filters .

First, a system was designed and built in the laboratory to measure the adsorption efficiency of PM2.5 and the pressure drop of filters. Then, six samples of various commercial cabin air filters and engine air filters were prepared and their PM2.5 adsorption was measured. The polymeric and composite nanofiber filters were made and their efficiency was investigated and finally, the results were compared.

For commercial engine air filters, the PM 2.5 adsorption was equal to zero and the absorption by cabin air filters was measured in the range of 5-8.33%. The adsorption was measured respectively 97 and 95% by polyacrylonitrile nanofiber and polyacrylonitrile composite nanofiber filter with nanochitosan .

 This study showed that the car filters were not able to remove PM2.5 but the polyacrylonitrile nanofiber filters were able to remove 95-97% of PM2.5. Therefore, by adding a layer of Nano-fiber introduced in this study to car filters, especially cabin filters, the PM2.5 removal efficiency can be improved, thus clean air is provided for car occupants.

With the increment of population, the need for sustainable energy development has been raised. By increasing greenhouse gas emissions and decreasing the fossil energy reserves have also shifted research centers around the world to renewable energy sources. Among renewable energies, wind energy is one of the most important types of renewable energy. In this study, the efficiency of the Savonius wind turbine is significantly increased by using an airfoil-shaped deflector. This increase in efficiency is carried out by upgrading the self-starting performance capability of the Savonius wind turbine and reducing the negative torque generated by the returning blade.

Different configurations of the proposed deflector system are considered numerically using the CFD solver. A three-dimensional incompressible unsteady Reynolds-Averaged Navier-Stokes simulation in conjunction with the SST k-ω turbulence model is done and validated with the available experimental data.

The predicted results indicated that the performance of the Savonius rotor is highly dependent on the position and angle of the deflector. Thus, there was an appropriate position and angle values to obtain the highest torque and power coefficients. It was concluded that using the favorable airfoil-shaped deflector significantly enhanced the static torque coefficient values in all angular ranges especially in the rotation angles between 0° to 30° and 150° to 180°. By properly covering the returning blade using the airfoil-shaped deflector, the static torque coefficient values increased up to 2 times higher than that generated by without deflector case.

The Savonius turbine suffers from poor efficiency. Hence, the present work dealt with proposing an improved deflector system led to generate higher power and torque coefficients which resulted in capturing a higher efficiency and better self-starting capability.

After World War II , the concept of sustainable development was introduced in order to balance the protection of the environment with the enjoyment of fundamental human rights, including the right to development; So that the exercise of human rights is not an excuse to destroy the environment. In fact, human beings realized that any damage to the environment ultimately endangers human beings and their dignity, and therefore, along with economic and social elements, environmental sustainability was identified as one elements of sustainable development. The present study seeks to examine how some governments, by identifying legal personality for the elements of nature, have taken steps towards environmental sustainability and ultimately the realization of sustainable development. It is a type of basic research that is descriptive-analytical and using library resources as well as using electronic resources including books, articles, dissertations, official conferences related to the subject (regional and international)in Persian and English languages and after raising the issue and clarifying the hypotheses, the data in accordance with the research questions in national and international judicial documents and procedures(both Persian and Latin)have been searched, collected, summarized and analyzed. One of the measures taken in recent years to environmental sustainability, has been recognized legal personality to the elements of nature. The practice of some countries, especially since 2008,shows that in order to achieve environmental sustainability, at the level of legislation or the procedure of the courts, the elements of nature have been recognized as rightful and representatives have been appointed to pursue their rights. Overall, developments in environmental law show that the identification of legal personality for the elements of nature has created a new development in the field of environmental law and sustainable development that is rapidly expanding in the international community. So that many governments can use this experience to take this step to provide the necessary grounds for greater environmental protection around the world.

Urban open spaces are areas where collective life takes place. In order to attract more citizens to these spaces, especially in tropical climates, the study of thermal comfort conditions is considered. Since heat sensation and perception vary from person to person outdoors, a quantitative approach to dealing with thermal comfort alone is not enough; Rather, it is important to pay attention to the psychological components of individuals. The aim of this study was to investigate the relationship between psychological components in individuals and the category of thermal comfort.

The present study was conducted by a combined method including descriptive method to explain the components of thermal and psychological comfort and survey method to determine the correlation between research variables. After conducting field surveys by a questionnaire by random method (using Cochran method) and measuring devices of climatic indicators, the weather conditions of different parts of the route On the 11th and 12th of Bahman 1398 (7 am to 1 am), measured and with the help of the Global Climate Index (UTCI) in the Karun River It is analyzed in Ahvaz.

 Evaluation and analysis of the extracted data show the effect of psychological components on the thermal response of individuals in different conditions. In fact, the mood of people in open spaces affects their thermal evaluation of the environment.

According to the research findings, the mental and psychological states of people in different conditions can have different and even unexpected thermal response both in the range of thermal comfort and outside it. Finally, solutions can be provided to better design urban spaces, to attract more audiences and arouse their sense of satisfaction.

Evaporation is one of the wasteful methods of water resources in geographical areas and is of special importance in the study of water resources.

In the present study, databases including Chah Nimeh dam evaporation data and large-scale network data have been prepared. The SDSM model is used to simulate the evaporation of the coming decades under three scenarios: RCP2.6, RCP4.5 and RCP8.5. The basic modeling period is from 1983 to 2005 (23 years)

Comparison of evaporation estimates for the next two time periods and under different scenarios showed that for the time period 2100-2080 scenarios RCP2.6 and RCP8.5 estimated higher values for evaporation. Examination of inputs showed that air temperature, geopotential height and wind indices have the greatest impact on the evaporation of wells in Sistan.

The results of this study showed that the rate of evaporation in the period of increasing 2100-2080 will experience more than 300 mm per year. The greatest increase in evaporation will be in the warm period of the year.