Air quality management (AQM) is becoming a major concern in Bangladesh due to rapid changes assoc... more Air quality management (AQM) is becoming a major concern in Bangladesh due to rapid changes associated with its development activities that is taking place at a rapid stride. The unplanned development along with urban population growth results in augmented demands for transportation, energy and other infrastructures that further causing high emission footprint on environment. Air quality data was collected from an air quality monitoring system operated by the Department of Environment (DoE) from 2014 to 2019 for Dhaka, Gazipur, Narayanganj, Chittagong, Sylhet, Khulna, Rajshahi and Barisal. The air pollutant CO,NOX, SO2, O3, , , and were taken into account for assessing the ambient air quality in major cities of Bangladesh. The trend analysis was carried out to address the changes in ambient air quality. The outcomes of the present study found that the ambient air environment is mostly unhealthy on the basis of the air quality index (AQI). The threatening AQI is mostly biased by the ...
This study aims to analyse RDS heavy metal concentr ations on road deposited sediment (RDS) using... more This study aims to analyse RDS heavy metal concentr ations on road deposited sediment (RDS) using Riccarton Campus of Heriot-Watt University, Edinburgh, Scotland as a study site. RD S samples were collected at two transverse positions from differen t sites over a 4 month period in order to describe the influence of traffi c on heavy metal emissions. The heavy metal concentrations of the RD S were determined by strong nitric acid digestion and atomic absorpti n spectrometry. The mean concentrations for Zn, Cu, Cd, Cr, Ni, Pb and Fe were found to be 213, 57, 1, 16, 15, 118, and 13497 mg kg -1 from samples near to the curb and 211, 79, 2, 15, 9, 35, and 14276 mg kg -1 from samples 1 m from the curb respectively. Furthermore for both positions t he highest concentrations for all metals were associated with the finer fraction (<63μm) and stronger correlations between the metal s were found further from the curb than near the curb, indicating that m e als accumulating on the road surfa...
The recent alternation of urban hydrology is seen significant due to the growth of urban sprawl. ... more The recent alternation of urban hydrology is seen significant due to the growth of urban sprawl. In the changed urban hydrology and urban settings, the city drainage is seen underperformed and problems are manifolds. This study therefore aims to evaluate the hydrologic performance of drainage under different land use patterns demonstrating urbanization effects using the Mahesh Khal in Chattogram as a studied watershed. This study analyses land use pattern of the study area with the data collected through field investigation and also gathered from the secondary sources using ArcGIS 10.4. The change patterns are realized portraying scenarios with statistical significance. The study revealed that the trends of built-up area is significantly high figuring out over doubled in last 30 years period; 24% in 1998 to 53% in 2018 compromising the lost of open water and vegetative surfaces. In align with such changes, the peak discharges found for 2, 5, 10, 25, 50 and 100 years return period we...
<p>Rainwater is considered as a dependable potable and non-potable water source, used for d... more <p>Rainwater is considered as a dependable potable and non-potable water source, used for domestic purposes as well as for human consumption in many cases. While it is usually believed that rainwater is safe for drinking purposes, many studies have explored the existence of trace metals in harvested rainwater, which can impose a serious health risk to human beings when present in relatively high concentrations. The concentration of trace elements in atmospheric precipitation including rainwater also provides a good indication of the environmental pollution caused by anthropogenic activities.</p><p>Chattogram, located in the south-eastern side of Bangladesh, is the busiest port city and the second-largest city in the country with a population of around 4.5 million people. With the presence of high salinity and arsenic in groundwater and poor quality of surface water in the region, rainwater harvesting is the most sustainable solution to be considered in the water system management for the area, particularly given annual mean precipitation of 2488 mm during the rainy season. In recent years, extensive studies have been carried out on the potential application of different rainwater harvesting systems across the region, but there have been very few studies devoted to the identification of the composition of trace elements in rainwater considering site-specific influences in the trace metal distribution in the rainwater.</p><p>The purpose of this study was to investigate the composition and source appointment of trace metals (Fe, Cu, Zn, Pb, Mn, Cr, and Cd) in rainwater in the south-eastern region of Bangladesh. To determine their sources and relative contributions in rainwater, a total of ninety-five rainwater samples were collected in this study from five different locations representing different land-use patterns (industrial, commercial, urban, and sub-urban) within the study area, from June 2018 to October 2019. The collected water samples were analyzed for Fe, Cu, Zn, Pb, Mn, Cr, and Cd using Atomic Absorption Spectrophotometer maintaining standard protocols. The measured trace elements from the collected rainwater samples were then compared with the WHO and Bangladesh drinking water standards.</p><p>The resulting concentration of trace metals in this study was found within the allowable limits in accordance with WHO and Bangladesh drinking water standards, confirming the suitability of rainwater as a potable water source for human consumption. The average concentration of trace metals in rainwater was found in the order of Zn &#707; Cu &#707; Fe &#707; Cr &#707; Mn &#707; Pb &#707; Cd for the tested samples. Overall, the trace metal concentrations of Cu and Zn were predominantly observed in rainwater samples collected from the industrial area, indicating the influence of anthropogenic activities on atmospheric pollution. The concentrations of the trace elements in this work were found to be overall higher when compared to those reported in other investigations around the world. The measurements of this study would provide an indication of atmospheric pollution in rainwater caused by the anthropogenic origins of trace metals as well as provide a database of trace metals in rainwater for further relevant research studies across the country.</p>
Heavy metal build-up patterns on roads were investigated using the Riccarton Campus of Heriot-Wat... more Heavy metal build-up patterns on roads were investigated using the Riccarton Campus of Heriot-Watt University as a study site. As well as observing the influence of the number of antecedent dry days on heavy metal concentrations on road deposited sediment, for the first time this study also considered the variability of pollutant build-up with sampling position across the road. Total metal concentrations for Zn, Cu, Cd and Pb from road sediments were determined by atomic absorption spectrometry using strong nitric acid digestion. The outcomes of this study revealed that mean Cu and Cd concentrations were much higher at 1 m from the curb than near the curb, Pb showed an inverse picture, while Zn concentrations were similar for both sampling positions. Heavy metal build-up over dry spells showed both increasing and decreasing trends. Decreasing trend was found for all metals near the curb which was unexpected and is contrary to current understanding of pollutant build-up while an increasing trendwas found for metals at 1 m away from the curb. This inferred that pollutants deposited away from the curb may have the same origin (traffic) with continuous input, while near the curb the sources are diverse. Correlation between metals for both positions also supported this fact. The results indicate that when deriving a relationship between pollutant build-up andantecedent dry days, it would be important to include the effect of transverse location.
Air quality management (AQM) is becoming a major concern in Bangladesh due to rapid changes assoc... more Air quality management (AQM) is becoming a major concern in Bangladesh due to rapid changes associated with its development activities that is taking place at a rapid stride. The unplanned development along with urban population growth results in augmented demands for transportation, energy and other infrastructures that further causing high emission footprint on environment. Air quality data was collected from an air quality monitoring system operated by the Department of Environment (DoE) from 2014 to 2019 for Dhaka, Gazipur, Narayanganj, Chittagong, Sylhet, Khulna, Rajshahi and Barisal. The air pollutant CO,NOX, SO2, O3, , , and were taken into account for assessing the ambient air quality in major cities of Bangladesh. The trend analysis was carried out to address the changes in ambient air quality. The outcomes of the present study found that the ambient air environment is mostly unhealthy on the basis of the air quality index (AQI). The threatening AQI is mostly biased by the ...
This study aims to analyse RDS heavy metal concentr ations on road deposited sediment (RDS) using... more This study aims to analyse RDS heavy metal concentr ations on road deposited sediment (RDS) using Riccarton Campus of Heriot-Watt University, Edinburgh, Scotland as a study site. RD S samples were collected at two transverse positions from differen t sites over a 4 month period in order to describe the influence of traffi c on heavy metal emissions. The heavy metal concentrations of the RD S were determined by strong nitric acid digestion and atomic absorpti n spectrometry. The mean concentrations for Zn, Cu, Cd, Cr, Ni, Pb and Fe were found to be 213, 57, 1, 16, 15, 118, and 13497 mg kg -1 from samples near to the curb and 211, 79, 2, 15, 9, 35, and 14276 mg kg -1 from samples 1 m from the curb respectively. Furthermore for both positions t he highest concentrations for all metals were associated with the finer fraction (<63μm) and stronger correlations between the metal s were found further from the curb than near the curb, indicating that m e als accumulating on the road surfa...
The recent alternation of urban hydrology is seen significant due to the growth of urban sprawl. ... more The recent alternation of urban hydrology is seen significant due to the growth of urban sprawl. In the changed urban hydrology and urban settings, the city drainage is seen underperformed and problems are manifolds. This study therefore aims to evaluate the hydrologic performance of drainage under different land use patterns demonstrating urbanization effects using the Mahesh Khal in Chattogram as a studied watershed. This study analyses land use pattern of the study area with the data collected through field investigation and also gathered from the secondary sources using ArcGIS 10.4. The change patterns are realized portraying scenarios with statistical significance. The study revealed that the trends of built-up area is significantly high figuring out over doubled in last 30 years period; 24% in 1998 to 53% in 2018 compromising the lost of open water and vegetative surfaces. In align with such changes, the peak discharges found for 2, 5, 10, 25, 50 and 100 years return period we...
<p>Rainwater is considered as a dependable potable and non-potable water source, used for d... more <p>Rainwater is considered as a dependable potable and non-potable water source, used for domestic purposes as well as for human consumption in many cases. While it is usually believed that rainwater is safe for drinking purposes, many studies have explored the existence of trace metals in harvested rainwater, which can impose a serious health risk to human beings when present in relatively high concentrations. The concentration of trace elements in atmospheric precipitation including rainwater also provides a good indication of the environmental pollution caused by anthropogenic activities.</p><p>Chattogram, located in the south-eastern side of Bangladesh, is the busiest port city and the second-largest city in the country with a population of around 4.5 million people. With the presence of high salinity and arsenic in groundwater and poor quality of surface water in the region, rainwater harvesting is the most sustainable solution to be considered in the water system management for the area, particularly given annual mean precipitation of 2488 mm during the rainy season. In recent years, extensive studies have been carried out on the potential application of different rainwater harvesting systems across the region, but there have been very few studies devoted to the identification of the composition of trace elements in rainwater considering site-specific influences in the trace metal distribution in the rainwater.</p><p>The purpose of this study was to investigate the composition and source appointment of trace metals (Fe, Cu, Zn, Pb, Mn, Cr, and Cd) in rainwater in the south-eastern region of Bangladesh. To determine their sources and relative contributions in rainwater, a total of ninety-five rainwater samples were collected in this study from five different locations representing different land-use patterns (industrial, commercial, urban, and sub-urban) within the study area, from June 2018 to October 2019. The collected water samples were analyzed for Fe, Cu, Zn, Pb, Mn, Cr, and Cd using Atomic Absorption Spectrophotometer maintaining standard protocols. The measured trace elements from the collected rainwater samples were then compared with the WHO and Bangladesh drinking water standards.</p><p>The resulting concentration of trace metals in this study was found within the allowable limits in accordance with WHO and Bangladesh drinking water standards, confirming the suitability of rainwater as a potable water source for human consumption. The average concentration of trace metals in rainwater was found in the order of Zn &#707; Cu &#707; Fe &#707; Cr &#707; Mn &#707; Pb &#707; Cd for the tested samples. Overall, the trace metal concentrations of Cu and Zn were predominantly observed in rainwater samples collected from the industrial area, indicating the influence of anthropogenic activities on atmospheric pollution. The concentrations of the trace elements in this work were found to be overall higher when compared to those reported in other investigations around the world. The measurements of this study would provide an indication of atmospheric pollution in rainwater caused by the anthropogenic origins of trace metals as well as provide a database of trace metals in rainwater for further relevant research studies across the country.</p>
Heavy metal build-up patterns on roads were investigated using the Riccarton Campus of Heriot-Wat... more Heavy metal build-up patterns on roads were investigated using the Riccarton Campus of Heriot-Watt University as a study site. As well as observing the influence of the number of antecedent dry days on heavy metal concentrations on road deposited sediment, for the first time this study also considered the variability of pollutant build-up with sampling position across the road. Total metal concentrations for Zn, Cu, Cd and Pb from road sediments were determined by atomic absorption spectrometry using strong nitric acid digestion. The outcomes of this study revealed that mean Cu and Cd concentrations were much higher at 1 m from the curb than near the curb, Pb showed an inverse picture, while Zn concentrations were similar for both sampling positions. Heavy metal build-up over dry spells showed both increasing and decreasing trends. Decreasing trend was found for all metals near the curb which was unexpected and is contrary to current understanding of pollutant build-up while an increasing trendwas found for metals at 1 m away from the curb. This inferred that pollutants deposited away from the curb may have the same origin (traffic) with continuous input, while near the curb the sources are diverse. Correlation between metals for both positions also supported this fact. The results indicate that when deriving a relationship between pollutant build-up andantecedent dry days, it would be important to include the effect of transverse location.
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