mansour barafrashtehpour | Isfahan University of Medical Sciences (original) (raw)
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Papers by mansour barafrashtehpour
Background and purpose: One of the biggest environmental problems of pulp and paper industries is... more Background and purpose: One of the biggest environmental problems of pulp and paper industries is discharge of colored wastewater containing lignin to environment. The aim of this study was to evaluate the TiO2 photocatalytic process Dap with iron in the presence of UV for lignin degradation. Materials and methods: This cross-sectional study was conducted at laboratory scale (in vitro) in a 2-liter reactor. The Synthesis of nano was made by sol-gel method. Lignin absorption was done using UV/Vis spectrophotometry at 280 nm. The samples were estimated based on factorial method (72 samples). The SPSS software version 16.0 and Excel 2007 and regression test were used for statistical analysis. Results: The highest removal rate in the presence of UV was 95.4%, and in the presence of sunlight was 87.4%. The removal rate of lignin increased when the concentration increased from 0.15 to 0.3 g/l. In all of the pH, the removal rate increased with increasing in retention time from 15 to 120 minutes and remains slightly constant after 60 minutes. The optimum pH was obtained 7. The reaction rate increased when the concentration of nano increase and the pH decreased. Conclusion: Based on the findings, the removal rate was considerably above in visible light and in the presence of sunlight, which represented the Dap role of nanoparticle; therefore, due to the low consumption, low power consumption and high efficiency, Doped nano can be used as an alternative for the removal of lignin from the pulp and paper industries.
Keywords: Lignin, degradation, photocatalytic, pulp and paper industries, TiO2,
Corrosion is a physicochemical reaction between metal and its surrounding that lead to changing i... more Corrosion is a physicochemical reaction between metal and its surrounding that lead to changing in water quality. Corrosion causes to solve the pipelines that release the pollutants in the water. The objective of this study was to assess the scale formation and corrosion of drinking water supplies in Yasuj (Iran) in 2012
Background and purpose: Nitrate contamination in aqueous solution has become an increasingly seri... more Background and purpose: Nitrate contamination in aqueous solution has become an increasingly serious environmental problem. Hence, in this study removal of nitrate in aqueous solution was reviewed using electrocoagulation (EC) and electro-fenton (EF) processes for Fe electrodes.
The nitrite and nitrate are considered as pollutant agents of ground water resource, which are cu... more The nitrite and nitrate are considered as pollutant agents of ground water resource, which are currently entering the wastewater types their average, are increasing. In this study, changes in nitrate and nitrite in drinking water resources of Gachsaran are reviewed with GIS systems.
The amount and composition of municipal solid waste, as basic data, require to design, operation ... more The amount and composition of municipal solid waste, as basic data, require to design, operation and optimization of waste management systems. The aim of this study was to investigate the qualitative and quantitative of municipal solid waste in tabriz city.
Background and purpose: Nitrate is one of the pollutants of groundwater resources which is easily... more Background and purpose: Nitrate is one of the pollutants of groundwater resources which is easily found in agricultural and wastewater disposal areas. The aim of this study was to determine the spatial and temporal variations of nitrate and nitrite in drinking water resources of Kohgiluyeh -a city in Iran- using Geographic Information System (GIS). Materials and methods: This cross-sectional study was carried out in 2011 in which 18 sources of drinking water (108 samples) and results of five-year-archived analysis in Water and sewage Co of Kohgiloyeh were studied applying GIS software ver. 9.3, SPSS ver. 16, and Pearson correlation test. Results: The results showed that the mean of nitrate concentration in 2007 was 18.5 ± 1.5 and in the summer and fall of 2011 was 20 ± 4.6 and 20.83 ± 2.2 ppm, respectively which indicates a direct correlation between years and the increase in nitrate concentration (R= 0.92, P= 0.01). However, the nitrite concentration was found steady in most years. The spatial variations represent worse quality of northwest. Ordinary kriging is the best interpolation method for nitrate and nitrite. Conclusion: According to the results, the concentration of nitrite and nitrate has increased during the past years and in some parts are even rising more than the standard levels. The reasons could be regional geology and agricultural and to prevent such problems protecting the wells, using river water for agriculture, and construction of wastewater treatment plants could be of great benefit.
World Applied Sciences Journal, 2008
J Adv Environ Health Res, 2014
Dental offices produce a variety of dangerous wastes during normal business day. Most of these wa... more Dental offices produce a variety of dangerous wastes during normal business day. Most of these waste are nonhazardous
that can be managed as household wastes; however, some component are hazardous and can pose a
risk to human and the environment if discarded to Municipal Solid Wastes. These types of wastes must be
managed separately. Therefore, the aim of this study was to assess the component and production rate of dental
waste in Sari city, northern of Iran in 2011-2012. A descriptive cross-sectional study was conducted on 64 private
dental practices from 146 available dental clinics in Sari city using a checklist and questionnaires which contain
25 questions and items. Dental wastes were weighed to determined qualitative and quantitative analysis. The data
were analyzed using SPSS and MS-Excel. The results indicated that 77% of produced wastes were non-hazardous.
The acceptable level management was observed only in 3.7% offices. The most desirable element management
was accurate collecting (30.88%) in these offices. In general, it can be concluded that there is no proper
management of wastes in dental centers of Sari. The mercury recycling is required for optimal management of
dental waste. Furthermore, the dentists’ education must be takes place to perform the management activities
including reduction, separation and recycling inside the office.
KEYWORDS: Waste Management, Dental Waste, production
Background and purpose: One of the biggest environmental problems of pulp and paper industries is... more Background and purpose: One of the biggest environmental problems of pulp and paper industries is discharge of colored wastewater containing lignin to environment. The aim of this study was to evaluate the TiO2 photocatalytic process Dap with iron in the presence of UV for lignin degradation. Materials and methods: This cross-sectional study was conducted at laboratory scale (in vitro) in a 2-liter reactor. The Synthesis of nano was made by sol-gel method. Lignin absorption was done using UV/Vis spectrophotometry at 280 nm. The samples were estimated based on factorial method (72 samples). The SPSS software version 16.0 and Excel 2007 and regression test were used for statistical analysis. Results: The highest removal rate in the presence of UV was 95.4%, and in the presence of sunlight was 87.4%. The removal rate of lignin increased when the concentration increased from 0.15 to 0.3 g/l. In all of the pH, the removal rate increased with increasing in retention time from 15 to 120 minutes and remains slightly constant after 60 minutes. The optimum pH was obtained 7. The reaction rate increased when the concentration of nano increase and the pH decreased. Conclusion: Based on the findings, the removal rate was considerably above in visible light and in the presence of sunlight, which represented the Dap role of nanoparticle; therefore, due to the low consumption, low power consumption and high efficiency, Doped nano can be used as an alternative for the removal of lignin from the pulp and paper industries.
Keywords: Lignin, degradation, photocatalytic, pulp and paper industries, TiO2,
Corrosion is a physicochemical reaction between metal and its surrounding that lead to changing i... more Corrosion is a physicochemical reaction between metal and its surrounding that lead to changing in water quality. Corrosion causes to solve the pipelines that release the pollutants in the water. The objective of this study was to assess the scale formation and corrosion of drinking water supplies in Yasuj (Iran) in 2012
Background and purpose: Nitrate contamination in aqueous solution has become an increasingly seri... more Background and purpose: Nitrate contamination in aqueous solution has become an increasingly serious environmental problem. Hence, in this study removal of nitrate in aqueous solution was reviewed using electrocoagulation (EC) and electro-fenton (EF) processes for Fe electrodes.
The nitrite and nitrate are considered as pollutant agents of ground water resource, which are cu... more The nitrite and nitrate are considered as pollutant agents of ground water resource, which are currently entering the wastewater types their average, are increasing. In this study, changes in nitrate and nitrite in drinking water resources of Gachsaran are reviewed with GIS systems.
The amount and composition of municipal solid waste, as basic data, require to design, operation ... more The amount and composition of municipal solid waste, as basic data, require to design, operation and optimization of waste management systems. The aim of this study was to investigate the qualitative and quantitative of municipal solid waste in tabriz city.
Background and purpose: Nitrate is one of the pollutants of groundwater resources which is easily... more Background and purpose: Nitrate is one of the pollutants of groundwater resources which is easily found in agricultural and wastewater disposal areas. The aim of this study was to determine the spatial and temporal variations of nitrate and nitrite in drinking water resources of Kohgiluyeh -a city in Iran- using Geographic Information System (GIS). Materials and methods: This cross-sectional study was carried out in 2011 in which 18 sources of drinking water (108 samples) and results of five-year-archived analysis in Water and sewage Co of Kohgiloyeh were studied applying GIS software ver. 9.3, SPSS ver. 16, and Pearson correlation test. Results: The results showed that the mean of nitrate concentration in 2007 was 18.5 ± 1.5 and in the summer and fall of 2011 was 20 ± 4.6 and 20.83 ± 2.2 ppm, respectively which indicates a direct correlation between years and the increase in nitrate concentration (R= 0.92, P= 0.01). However, the nitrite concentration was found steady in most years. The spatial variations represent worse quality of northwest. Ordinary kriging is the best interpolation method for nitrate and nitrite. Conclusion: According to the results, the concentration of nitrite and nitrate has increased during the past years and in some parts are even rising more than the standard levels. The reasons could be regional geology and agricultural and to prevent such problems protecting the wells, using river water for agriculture, and construction of wastewater treatment plants could be of great benefit.
World Applied Sciences Journal, 2008
J Adv Environ Health Res, 2014
Dental offices produce a variety of dangerous wastes during normal business day. Most of these wa... more Dental offices produce a variety of dangerous wastes during normal business day. Most of these waste are nonhazardous
that can be managed as household wastes; however, some component are hazardous and can pose a
risk to human and the environment if discarded to Municipal Solid Wastes. These types of wastes must be
managed separately. Therefore, the aim of this study was to assess the component and production rate of dental
waste in Sari city, northern of Iran in 2011-2012. A descriptive cross-sectional study was conducted on 64 private
dental practices from 146 available dental clinics in Sari city using a checklist and questionnaires which contain
25 questions and items. Dental wastes were weighed to determined qualitative and quantitative analysis. The data
were analyzed using SPSS and MS-Excel. The results indicated that 77% of produced wastes were non-hazardous.
The acceptable level management was observed only in 3.7% offices. The most desirable element management
was accurate collecting (30.88%) in these offices. In general, it can be concluded that there is no proper
management of wastes in dental centers of Sari. The mercury recycling is required for optimal management of
dental waste. Furthermore, the dentists’ education must be takes place to perform the management activities
including reduction, separation and recycling inside the office.
KEYWORDS: Waste Management, Dental Waste, production