مجله پژوهش و فناوری محیط زیست
پیاپی 10 (پاییز و زمستان 1400)

Urbanization and climate change are two global phenomena and are inherently correlated. Land use, as one of the most important factors in this field, affects climate change in various ways. One way to manage this issue is to use multilevel climate governance, which provides a flexible conceptual framework for understanding the relationship between cities, regions, and national governments related to mitigation and adaptation strategies. The purpose of this study was to evaluate the laws related to land use according to the criteria of the governing by authority in the framework of multilevel climate governance in Qazvin urban region. In this study, the method of documentary research and the technique of systematic review of texts and in order to comply with the criteria of the governing by authority and legal materials in the laws and regulations, the comparative-analytical method has been used. In this way, 10 laws regarding the existence of legal articles were evaluated, in which local government officials have been given authority in the field of land use planning. The results of the study indicate that ther are different challenges such as the impact of policies and strategies of development documents on decisions, differences between decisions and upstream documents, differences in the type of reference review and licensing, legal gaps in related laws and inconsistencies in implementation in the field of land use planning in Qazvin urban region, and some decisions are based on less delegated authority at the local level, and the resulting actions are more vulnerable.

In this regard, with the aim of studying the rural spatial organization, the present study seeks to first determine and form a hierarchy of settlements that can be an effective framework for the distribution of services and functions at different levels, and finally the prevailing spatial pattern in Identify the area. Therefore, in order to achieve the objectives of the research, using the centrality index and applying 35 variables, the studied settlements were classified at different functional levels (5 levels). It is noteworthy that the present study is applied in terms of purpose and based on descriptive-analytical method. The method of data collection is due to the nature of library and field research. Geographical territory of research is Zebarkhan village of Neishabour city. The findings of the study indicate that the lack of proper distribution of services and lack of spatial balance has increased mobility and movement between human settlements in the countryside. Hence, the two settlements of Ghadamgah, Darrud, have become the main places of intra-district traffic with the first ranks. Meanwhile, the villages of Bazhidar, Aliabad, Cheshmeh Khosrow, Mohammadabad, Qaredash, Qarebeik and Kalateh Lavidani are at the lowest level of development (deprived) and lack the minimum services and facilities.The results indicate that the pattern of flows is one-way relationships and no complementary, two-way and synergistic relationships are formed.

The present study investigates the factors affecting the development of tourism demand based on ecotourism in rural areas of Gilan. The research method is analytical and the purpose of the research is practical. In order to analyze the data, SPSS software and FARAS model were used. The results of the exploratory analysis model showed that in the physical factor, the sub-criterion (existence of beautiful and unique landscapes) had the highest percentage of effect and the criterion (suitability of recreational and sports equipment) had the least effect, in the economic factor, the sub-criterion (cheapness) Travel to the villages of Gilan) the most impact and and sub-criteria (reasonable prices of welfare accommodations and tourist suites) have the least impact, finally the social factor, sub-criteria (attractive lifestyle of the people of Gilan village for tourists) the most impact and Sub-criteria (level of awareness and education of rural residents towards tourists) has the least impact on the development of ecotourism demand in rural areas of Gilan. The results of the gray Aras model showed that the physical dimension with weight (0.590), the social and cultural dimension with weight (0.542), the economic dimension with weight (0.389), the highest and the lowest, respectively. They have the highest rankings.

Many economic tools have been proposed and used to reduce climate change. Carbon trading is one of these market-based tools that is recognized as a cost-effective way to change climate and environmental issues. Today, the issue of carbon sequestration and bioenergy production versus fossil fuels is great concern of governments, and many efforts have been made to reduce or control carbon dioxide emissions. The aim of this study is to investigate carbon price fluctuations and predict price trends based on historical carbon price data in the time series 2005-2020. Data were analyzed by regression analysis based on Fuller augmented Dicky after eliminating inflation. The results show that the trend of carbon prices has fluctuated during this period. The average expected price of carbon is 3,303,589 Iranian Rials.Many economic tools have been proposed and used to reduce climate change. Carbon trading is one of these market-based tools that is recognized as a cost-effective way to change climate and environmental issues. Today, the issue of carbon sequestration and bioenergy production versus fossil fuels is great concern of governments, and many efforts have been made to reduce or control carbon dioxide emissions. The aim of this study is to investigate carbon price fluctuations and predict price trends based on historical carbon price data in the time series 2005-2020. Data were analyzed by regression analysis based on Fuller augmented Dicky after eliminating inflation. the trend of carbon prices has ش fluctuated during this period. The average expected price of carbon is 3,303,589 Iranian Rials.

Today, tourism is one of the largest industries in the world and depends on a major part of the global economy; Tourism is economically, socio-culturally and environmentally integrated with the lives of people and governments. The purpose of this study is to investigate the managerial performance of tourism complexes and present a strategic proposal with emphasis on socio-cultural components in Kermanshah tourism complex. This article examines the managerial performance in four tourism complexes, Rakhsh, Nesar, Nodsheh and Sefid Barg in Kermanshah province. And how can focusing on these components provide successful and appropriate management for the Kermanshah Jihad University tourism complex? This research was conducted using field survey and questionnaire tools presented to 152 people in Kermanshah tourism managers. The results showed that the components of reviving cultural identity and sense of national pride, promoting the culture of tourist reception and retention are ranked first, second and third among all the identified components affecting the managerial performance of tourism complexes, respectively. Accordingly, the emphasis on cultural identity and the necessary training to the managers of the complexes to create a culture of tourist reception has a significant impact on attracting tourists to the tourist complexes of the province.

Denitrification of drinking water has a research history of more than three decades in the field of water treatment and is still the subject of many research projects. The main purpose of this study is to obtain or modify methods for removing nitrate from drinking water in an economic way and force minimal adverse effects on the environment. The use of photocatalytic process for denitrification is not new, but there are still many ambiguities. In this study, the feasibility of using two different photocatalysts over the ultra-high performance concrete (UHPC) substrate was discussed. This new substrate is fabricated by immobilizing the photocatalyst inside a cement matrix which acts as an active layer over the UHPC surface. Optimum long-term lifecycle and higher efficiency of this active surface is achieved without a significant drop of the photocatalyst activity near the surface. In this study, the possibility of using photocatalytic composite layers over the elements made of UHPC for applications such as water supply channels was evaluated and the challenges of using such layers on UHPC surfaces were described. According to the studies, it was found that the use of fixed cement composite bed for photocatalytic treatment has advantages over other methods of photocatalytic water treatment.

Heavy metals are not chemically degraded, in order to prevent the entry and accumulation of this toxic pollutant along with factory effluents into the environment, so far, different methods have been used, but finding new methods with more efficiency in this area is necessary. In this research, a new class of compounds called organic metallic materials has been used to remove industrial effluent lead. These organic metallic materials contain iron and benzene tricarboxylate. To identify the characteristics of these materials, electron microscope images and Nitrogen adsorption and desorption isotherms has been used. To determine the optimal conditions for using these materials for lead removal from the effluent, the effect of parameters: time (10-120 min), the amount of adsorbent (0.2-0.5 mg/L), pH (3.5 -12.5) and temperature (10-75 ° C) were evaluated. The results show that the composition of MIL-100 (Fe) has a better performance than the other materials in this study and complete removal of lead was achieved with an initial concentration of 10 mg/l and an adsorbent dose of 0.25 mg / l, at a temperature of 50 ° C, pH =4.3 and contact time of 120 min. Other properties of this material in removal of industrial effluent lead such as magnetic properties, reusability in five consecutive periods, large surface area, low cost, high efficiency and easy to use, make it an ideal option for large-scale use.

Nowadays, the importance of water is known more than before as a life factor and the axis of sustainable development that to protect and manage it, it needs to be controlled using laboratory tests and regular monitoring program. The purpose of this study was to investigate the treatment plant effluent of three large industrial towns in Gilan province and comparing the index parameters with Environmental Protection Organization standards; the measured parameter included pH, TDS, DO, COD and BOD5. The results showed that, some index parameters in the treatment plant effluent in some industrial towns were more than the approved discharge standards to the receiving environments which indicates the necessity of paying attention to regular monitoring and investigation of wastewater treatment systems in industrial towns more than before.

Determining suitable land uses in order to make optimal use of the land and prevent the destruction of resources is an effective step in the sustainable development strategy. On the other hand, ecotourism is considered as a tool to improve the social and economic levels of indigenous peoples and one of the most important positive effects of tourism in nature can be considered the protection of natural resources in the region. Accordingly, in this study, the introduction of global criteria for selecting the geographical location of forest parks to develop the tourism industry in the watershed or wider for ecotourism was examined. Due to the lack of comprehensive planning at the national level, urban service uses, including urban forest parks, face problems such as inadequate distribution and location, lack of such spaces in cities, and a per capita shortage of green space. Green space in urban areas is considered as a tool to reduce the stress of everyday life and is of great importance and attention. Due to this issue, it is necessary to construct urban green spaces, including urban forest parks, and select new locations with detailed studies and principled methods in cities. Choosing the right place is very important in reducing costs in setting up various activities. For this reason, it is one of the most important and effective steps in the implementation of projects. In this article, after stating the preliminary definitions of urban forest parks, the criteria and standards used worldwide in locating urban forest parks are discussed. The main purpose of this study is to investigate the location criteria of urban forest parks. The results indicate the importance of land use criteria, accessibility, topography, landscape, proximity to water resources, vegetation and so on.

Climate change is one of the natural features of the atmospheric cycle, which results in anomalies or fluctuations in the process of meteorological parameters such as rainfall and temperature. Also, drought is one of the weather and climate disasters, including catastrophic events. It alternates with floods and causes significant damage each year. Lack of rainfall has different effects on groundwater, soil moisture and river flow. For this reason, the study of changes in precipitation and temperature has always been the focus of researchers in various sciences, including natural resources and the environment. In this study, using the data of Kermanshah Meteorological Organization related to 30 years of rainfall, average minimum temperature and average maximum temperature in three stations of Kermanshah, Islamabad West and Sarpol-e Zahab to assess the severity of drought each year by DIC software Using standard precipitation index (SPI) and examining the trend of temperature changes using two non-parametric Mann-Kendall tests, Sensitimator and also linear regression. In order to study the drought trend during the 30-year period, statistical software was used and the results showed that during the 30-year period, all three stations are in near normal condition. Also, the results of temperature changes using the mentioned tests indicate the increasing trend of temperature and this trend is significant at the level of 99% using two non-parametric Mann-Kendall tests.

Petroleum hydrocarbon pollutants are one of the hardest compounds in terms of decomposition and control and classified as stable and important organic pollutants that have adverse effects on human health and the environment and combating environmental pollution caused by them is an important issue for the world and human societies. Although the removal of these pollutants from the environment is a major problem, biodegradation (which uses natural microbial biodegradation activity) is an ecofriendly and economical approach to control these types of contaminants and has become a pivotal method of cleaning up environments contaminated with petroleum hydrocarbons. The present study provides a comprehensive, uptodate and efficient review of the bioremediation of petroleum hydrocarbon pollutants, taking into account the hydrocarbon alterations in microorganisms with a particular focus on the new insights gained in recent years. Also, the metabolism of hydrocarbons in microorganisms has been described by reviewing research presented in recent years. The results of studies show well that petroleum hydrocarbon pollutants are biodegradable using some microorganisms such as oleophilic and their removal by this method is cost-effective and economical. Microbial biodegradation of petroleum hydrocarbon contaminants uses the enzymatic catalytic activities of microorganisms to increase the degradation of contaminants several times more than traditional methods

Industrial development and rapid population growth due to the increase in consumed materials and the consequent increase in industrial waste is one of the challenges in the world. The purpose of this study is to investigate the quantity of industrial waste production in the industrial group of plastics and synthetic rubber in Guilan province and the conditions of resulting pollution. The results of this study show that the major industrial wastes identified in this group include plastic waste, paint cans, cardboard waste, paint powder, packaging strap, polymer waste, polymer sludge, wood waste, glass and carbon fiber waste. Plastic waste with 136.08 tons is the highest and paint powder with 0.04 tons is the lowest industrial waste produced in this group. The used oil with a total amount of 14092 liters per year is the only hazardous waste identified in this group. From the present study, it is concluded that the main management methods used in this industrial group are recycling and sales, but hazardous waste is not disposed of properly. The proposed method for used oil is refining.