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Nurun Nahar 《Environment, Development and Sustainability》2009,11(3):571-588
The contamination of groundwater in Bangladesh by arsenic is a widespread and serious environmental problem, affecting mainly
the rural population who rely extensively on groundwater for drinking and cooking. The study conducted survey work in a few
affected villages of the Northwest region in Bangladesh. The household survey gathered information on the respondents (affected
by arsenic) water usage and sources, knowledge of the arsenic problem, changes in the source of water for drinking and cooking,
arsenic mitigation technologies and socio-economic information on the households. The survey work shows that percentage of
male patient is higher than female patient among the same level of household income in each study villages. Prevalence of
arsenicosis is more among poorer sections and it is directly related to the poverty situation of the community. People know
more about the health problems caused by arsenicosis but lack knowledge about mitigation aspects. In one of the study areas,
every year an extra 4% tubewell is getting contaminated by arsenic. Arsenic contamination in groundwater also affects the
environment and the ecology negatively. The NGOs have been found contributing to a knowledge creation process in the village
community as the villagers are showing marked behavioral changes in water-use practice.
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Nurun NaharEmail: |
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Mst. Shamsun Nahar Jing Zhang Akira Ueda Fujishiro Yoshihisa 《Environmental geochemistry and health》2014,36(6):1079-1094
The present study evaluated water supply geochemistry in Dhaka City, Bangladesh, to provide detailed trace level (subppb) water quality data that include major ions, low dissolved oxygen (DO) and toxic trace metals for sustainable development. Dhaka Groundwater, which almost uniformly meets the World Health Organization guideline, has become the preferred source. Due to groundwater depletion and an ever-increasing need to meet water demands by city residents, Dhaka water supply and sewerage authority has initiated the treatment of river water, despite the fact that very little is known about the geochemical structure, and trace metal content in the Dhaka water supply. Major ion composition of water samples was determined, and the results used to generate Stiff diagrams. The diagrams served to visually compare water from different sources based on units of mass/volume. Hydrochemical facies analysis showed supply ground and surface waters are comprised predominately of Ca–Na–Mg–HCO3 and Ca–Na–Mg–HCO3–Cl types. Spatial distribution of ions, and Na/Cl and Na/SiO2 molar ratio indicated that silicate weathering is the dominant geochemical process. Chemical data revealed that toxic Cr metal mobilization is associated with chemical hazards from the leather industry. The vulnerability of deep wells to contamination by As is governed by the geometry of induced groundwater flow paths and the geochemical conditions encountered between the shallow and deep regions of the aquifer. Quantifying total arsenic (As) and As from interlocking geochemical cycles (Fe, Mn) may assist in interpreting As dynamics in Dhaka well water. The surface source water was hypoxic to anoxic low DO associated with very high concentrations of biological oxygen demands, and electrical conductivity compared to industrial and non-industrial urban processes and standard activity guidelines. The results of this study should be applied to future research focused on the potential to improve water quality in urban and surrounding areas. 相似文献
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Rakib Md.Refat Jahan Rahman Md. Asrafur Onyena Amarachi Paschaline Kumar Rakesh Sarker Aniruddha Hossain M. Belal Islam Abu Reza Md. Towfiqul Islam Md. Saiful Rahman Md. Mostafizur Jolly Yeasmin Nahar Idris Abubakr M. Ali Mir Mohammad Bilal Muhammad Sun Xian 《Environmental science and pollution research international》2022,29(45):67532-67558
Environmental Science and Pollution Research - The coastal zone of Bangladesh, with a population density of 1278 people per square kilometer, is under serious threat due to heavy metal pollution.... 相似文献
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Photocatalytic degradation of phenol by visible light-responsive iron-doped TiO2 and spontaneous sedimentation of the TiO2 particles 总被引:3,自引:0,他引:3
Fe-doped TiO2 was prepared by the calcination of FexTiS2 (x = 0, 0.002, 0.005, 0.008, 0.01) and characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and UV–visible diffuse reflectance spectra. All the Fe-doped TiO2 were composed of an anatase crystal form and showed red shifts to a longer wavelength. The activity of the Fe-doped TiO2 for the degradation of phenol was investigated by varying the iron content during UV (365 nm) and visible light (405 nm and 436 nm) irradiation. The degradation rate depended on the Fe content and the Fe-doped TiO2 was responsive to the visible light as well as the elevated activity toward UV light. The molar ratio of 0.005 was the optimum for both the UV and visible light irradiations. The result was discussed on the basis of the balance of the excited electron–hole trap by the doped Fe3+ and their charge recombination on the doped Fe3+ level. The Fe-doped TiO2 (x = 0.005) was more active than P25 TiO2 under solar light irradiation. The suspended Fe-doped TiO2 spontaneously precipitated once the stirring of the reaction mixture was terminated. 相似文献
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Islam Shafiqul Rahman Arifur Nahar Kamrun Chowdhury Saljar Rahman Ahmed Istiaq Mohiuddin K. M. 《Environmental science and pollution research international》2022,29(44):66490-66506
Environmental Science and Pollution Research - Kumarkhali upazila in Kushtia district of western Bangladesh has become especially vulnerable to dye-effluent pollution over the last two decades.... 相似文献