Majid Kermani; Roshanak rezaei; hossein Salehi; sevda fallah jokandan
Abstract
Background: One of the most important environmental pollutants is color Compounds that are generally used in the textile, paper, cosmetics, food and leather industries, and their discharge into wastewater has harmful effects on the environment. The aim of this study is determination of efficiency of ...
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Background: One of the most important environmental pollutants is color Compounds that are generally used in the textile, paper, cosmetics, food and leather industries, and their discharge into wastewater has harmful effects on the environment. The aim of this study is determination of efficiency of ash and powder Rosa Damascena Wastes in removal of Reactive Blue from aqueous solutions. Methods:In this experimental study, after the preparing of powder and ash Rosa Damascena Wastes absorbent, the effect of various parameters of operation such as pH (3-10), the initial concentration of dye (25, 50, 100 and 300 mg/L), contact time (5-180 minutes) and absorbent dose (0.5- 6 g/L) were studied. Finally the results were analyzed by kinetics and isotherm modeling. Results: In this study, equilibrium time of powder and ash Rosa Damascena Wastes Obtained 60 and 45 minutes respectively. The Maximum efficiency of absorbent powder and ash was obtained 74 and 91 percent, respectively, at pH 3, contact time of equilibrium and absorbent dosage 4 g/L. isotherm studies matched with Freundlich isotherm models for both absorbents. Kinetic equations followed the pseudo-second of the model better. Conclusion: The results showed that Powder and ash of Rosa Damascena Wastes can be used as an effective, available and affordable absorbent for removal of color pollutants from aqueous solutions.
Majid Kermani; sevda fallah jokandan; Mina Aghaei; Mohsen dowlati
Abstract
Background & Objective : Air pollution is considered as one of the the most important risks of uncontrolled growth of cities, economic development and energy consumption in the last century. In large cities, such an increasing trend seriously threatens the health of residents. This study aims to ...
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Background & Objective : Air pollution is considered as one of the the most important risks of uncontrolled growth of cities, economic development and energy consumption in the last century. In large cities, such an increasing trend seriously threatens the health of residents. This study aims to evaluate the health effects of PM10, PM2.5 and SO2, and estimate the mortality and morbidity rate of cardiovascular, respiratory and Chronic obstructive pulmonary, attributed to the aforementioned pollutants, using AirQ model in metropolis of Tehran in 1392. Materials & Methods: In this cross-sectional study, Data required were collected from environmental protection organization and air quality control center of Tehran. These data were analyzed by Excel, and the processed data entered AirQ model. Then relative risk, basis risk and attributable fraction were estimated. Finally, the gained results, being mortality and morbidity rate, were presented in tables and graphs. Results: The results showed that the average annual concentration of PM10, PM2.5 and SO2, were 73, 43 and 41 μg/m3, respectively, being 3.65, 4.3 and 2.05 times higher than the national standard of Iran and WHO guidelines, correspondingly. Total number of mortalities attributed to the PM10, PM2.5 and SO2, were about 2187, 2842 and 721, respectively, being 3.65%, 4.75% and 1.20% of total deaths of Tehran city (except accidents), correspondingly. Conclusion: The results showed the health effects of particulate matter and sulfur dioxide pollutants, including total mortality, cardiovascular mortality, respiratory, hospitalizations due to chronic obstructive pulmonary disease and myocardial infarction in Tehran. So, it’s obviously clear that the proportion of mentioned pollutants are being increased in Tehran’s atmosphere that requires more attention of officials and experts to control air pollution.
Majid Kermani; Mohsen Dowlati; Ahmad jonidi jaffari; Roshanak Rezaei kalantari
Abstract
Background and objective: Air pollution is one of the major factors threatening human health and our environment. This study aimed at the comparative investigation of Air Quality Health Index (AQHI) and its application in the city of Tehran since 2007 to 2014. Materials & Methods: This Study ...
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Background and objective: Air pollution is one of the major factors threatening human health and our environment. This study aimed at the comparative investigation of Air Quality Health Index (AQHI) and its application in the city of Tehran since 2007 to 2014. Materials & Methods: This Study was a descriptive–analytic one. First, the required data were taken from Department of Environment and the Air Quality Control Company. The data were validated by the World Health Organization criteria .The air quality health index was measured based on the air quality standard tables and classified into low, medium, high and very high degrees. Results: The results show that according to air quality health index, the level of air pollution in Tehran has been undesirable since 2007 to 2014 and in 95%,92%,73%,65%,57%,65%,52%,46% of days Air quality has exceeded the standard level respectively .So, the level of risk has been high and sometimes very high. Conclusion:As a result, due to high level of air pollution and its dangerous effects, proper planning and management should be considered in environmental health sectors to control and reduce air pollution.