Ali akbar Mohammadi; Hossein Alidadi; Mohammad Bagher Delkhosh; Seyede Horriey Fallah; Abdoliman Amouei; Hosseinali Asgharnia; Vahid Taghavi manesh; Monireh Ghorbani
Abstract
Background and purpose: Exposure to the environmental noise originated from traffic is common in urban areas, and can lead to the adverse health effects. Present study aimed to determine average Sound Level Index (SLI) and noise pollution in overcrowded areas of Neyshabur, Iran. Materials and methods: ...
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Background and purpose: Exposure to the environmental noise originated from traffic is common in urban areas, and can lead to the adverse health effects. Present study aimed to determine average Sound Level Index (SLI) and noise pollution in overcrowded areas of Neyshabur, Iran. Materials and methods: This cross-sectional study was accomplished over three primary months of 2015 in Neyshabour city. Six stations in main and crowded parts of Neyshabour including Imam Khomeini, Enghelab Square, Khayyam Square, Azadi Square, Beasat crossroad and Attar Street were applied to measure the SLA in three time period of a day. The measurements were carried out using SVAN953 mean. Statistical analyses of the obtained data were performed by SPSS 18 software. Results: The achieved results revealed that the average SLI at the aforementioned stations were (100.06 ±5.16), (93.38 ± 5.15), (86.58 ± 4.96), (93.38 ± 5.15), (97.38 ± 4.15) and (96.90 ± 2.17) dB respectively. The maximum and minimum Equivalent sound levels were 125.4 and 80.2 dB at the Imam Khomeini station (as a commercial area) in the morning and Beasat station (as a residential area) in the evening correspondingly. Conclusion: In all stations, the measured sound pressure levels were higher than its permission limit for residential and commercial areas. Regarding the adverse health effects of noise pollution, it needs to perform required investigations to reveal the effective factors.
mahin karbar; aliasghar najaf poor; hossein alidade; Habibollah Esmaily
Abstract
Introduction: Daily excreted large amounts of waste from human communities in different ways. A significant portion of this waste consists of organic material. The recycling of these materials and using them in different ways prevent the damage caused to the environment and conserve resources and energy ...
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Introduction: Daily excreted large amounts of waste from human communities in different ways. A significant portion of this waste consists of organic material. The recycling of these materials and using them in different ways prevent the damage caused to the environment and conserve resources and energy is human attention. One of the appropriate methods of disposal of these wastes, production of organic fertilizer, vermicompost is. Objectives & ( hypothesis OR questions): Given that the municipality Ghochan, rotted cow manure and dried leaves of the trees used to produce vermicompost In this study the vermicompost production of cow manure, fruit waste, paper, sawdust and leaves (as carbon source) and germination index vermicompost is examined To finally be able to obtain the best additive to produce vermicompost. Materials & Methods: 5 treatments that are used to carry out the plan include: cow manure- Fruit lesions- Sawdust- leaf- Paper- Composition of the waste. Results: Used waste includes waste sawdust, fruit, paper, leaf and composition of the waste is suitable for vermicomposting is Eisenia fetida earthworms and proper nutrition. Waste paper to produce vermicompost alone is not suitable and it is better to prepare vermicompost should be used in combination with other organic wastes.. Conclusion: Changes of ash and carbon and C / N ratio indicates the fact that virtually After 70 days, the bedding materials are firmly established.
Damon Ketabi; Reza Esmaili; Hosein Alidadi; Roya Peirovi; Fatemeh Joulaei
Abstract
Background and Objective: Air pollution is one of the current concerns. Human health has been faced with serious risks due to air pollution as a consequence of urbanization. Continuous monitoring of air quality to determine pollutants and identify their emissions sources are considered as the key strategies ...
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Background and Objective: Air pollution is one of the current concerns. Human health has been faced with serious risks due to air pollution as a consequence of urbanization. Continuous monitoring of air quality to determine pollutants and identify their emissions sources are considered as the key strategies for air pollution control. The main objective of this study was evaluation of Mashhad air quality and determination of responsible pollutants in 2015. Materials and Methods: In this cross-sectional study, the instantaneous concentrations of air pollutants including O3, CO, SO2, NO2, PM2.5 and PM10 were measured at the three stations of Mashhad during 2015-2016. Based on Air Quality Index (AQI), Mashhad air quality was classified in groups of good, moderate, unhealthy for the sensitive people, unhealthy, very unhealthy and dangerous. Results: The results of the air quality index indicated that the air quality in 46 days was exceeded the standard limit in Mashhad in 2015-2016. The air quality category included 12.5% days unhealthy for sensitive groups, 74.5% days health. Conclusion: In this study, PM2.5 was determined as the main responsible pollutant in non-standard conditions of Mashhad air. Optimizing public transportation, considering environmental standards at the urban transportation management and Launch intelligent traffic control are the most appropriate strategies proposed to control Mashhad air pollution.
Mitra Gholami; Mojtaba Davoudi; Simin Naseri; Amir Hossein Mahvi; Mehdi Farzadkia; Ali Esrafili; Hossein Alidadi
Abstract
Backgrounds & Objectives: Elimination of phenolic compounds which is considered as resistant pollutants to biological degradation has a great importance. This study aims to investigate the electrochemical oxidation process efficiency in removal of phenol compounds using a continuous and divided rector. ...
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Backgrounds & Objectives: Elimination of phenolic compounds which is considered as resistant pollutants to biological degradation has a great importance. This study aims to investigate the electrochemical oxidation process efficiency in removal of phenol compounds using a continuous and divided rector. Materials & Methods: The catalytic anodes of Ti/SnO2-Sb and cathodes of iron were employed in a reactor divided into anolyte and catholyte chambers by a cellulosic separator. The influence of initial phenol concentration (14.12‒40.88 mg L‒1), retention time (32.23‒82.77 min), and current intensity (0.18‒0.42 A) on TPh removal efficiency, TPh residual concentration, and energy consumption was investigated using response surface methodology. Results: The results showed that TPh removal efficiency strongly depends on retention time, followed by current intensity and initial phenol concentration. The importance order of factors affecting on TPh residual concentration were distinguished as initial TPh concentration > retention time > current intensity. The energy consumption in terms of kWh m‒3 is mostly affected by retention time and then current intensity, and irrespective of initial phenol concentration. Under the optimal conditions, removal efficiency of 93.21%, residual concentration of 1 mg L‒1, and energy consumption of 34.40 kWh m‒3 is achieved. Conclusion: Based on the obtained results, the electro-oxidation is a very efficient process for diminution of wastewater phenolic content, and is able to set the allowable limits to discharge to the environment.