Industrial Waste and Effluent. In Dhaka city, the petrol stations, motor vehicle repairing shops, major hydrocarbon depots, bitumen industries, numerous chemical industries including pharma-ceuticals, and other hydro-carbon storage tanks are the main sources of NAPLs.
It could lead to subsidence of the clay soil plate Dhaka is situated on," said Khandakar Fazal Hasan. Other Wasa officials have asserted, however, that Wasa will not be able to keep the number of 1,foot tubewells under 45, and may continue to increase the number by an indefinite amount in the future.
Experts say regulation of water flow in the Ganges at Farakka point by India has caused a reduction of dry season flow. In such case, any potential groundwater contamination by hydrocarbons may contaminate groundwater in the central portion of Dhaka city as it is evident that the groundwater in this city moves towards the city center, where high groundwater abstraction of the city lowers down the water table to about several tens of meters over the years.
The answer to the problem lies in having surface water treatment plants and going for conservation of rainwater for lean-time use. This paper analyzes the different types of environmental pollution and associated health hazard in Bangladesh.
Air and water pollution, groundwater contamination, nuisance from solid wastes and noise pollution are the main environmental pollutions of Bangladesh. According to the study, Dhaka's groundwater level was Harness of ground water is cheaper and safer in comparison with rainwater.
Surface water pollution Surface water occurs in oceansrivers, lakes, ponds and floodplains. Bangladesh is prone to recurring natural disasters like floods, erosion, cyclones and tidal surges that result in human casualties and economic losses.
Moreover, human activities such as use of agro-chemical and dumping of industrial and municipal wastes in the open water bodies have seriously deteriorated the surface water quality, the report said The Daily Star, Dr ANH Akhter Hossain, Managing Director of Wasa, said a total of 10 tubewells of a 1,foot depth have already been installed recently in the city's Mirpur area, with 35 more to be installed in the near future.
Added to this pollution, fecal pollution is by far the most serious water contamination problem, while water and air pollution is causing increasing concern in the rapidly growing urban areas. Water crisis deepens at infectious diseases hospital Water crisis has become acute at infectious disease hospital in Mohakhali, causing immense sufferings to both the patients and hospital staffs.
Such contaminated water, which causes many water-born diseases, is a public health disaster. In fact, the rivers have become a dumping ground of all kinds of solid, liquid and chemical waste of bank-side population.
In Arizona, an estimated 35 percent of water-supply wells were put out of compliance by the new regulation; in California, the percentage was 38 percent.
Local incidents Of saline water intrusion have occurred on all coasts of the United States. This method can also greatly help recharge Dhaka's water tables fast during the rainy season.
It is thought that it may take years to develop symptoms. Particularly low groundwater velocities are found in areas surrounded on two or three sides by a river, as for example in the inside of meanders.
The most widespread anthropogenic sources are the infiltration of industrial and urban wastes disposed on the ground or in surface water bodies. The waters are also affected by municipal sewage disposal contamination, agro-chemicals and large amount of suspended sediments carried by upstream flow.
Air pollution of Bangladesh is caused due to increasing population and associated motorization. Arsenic acid H3AsO4arsenous acid H3AsO3 and their derivatives are typically encountered in arsenic contaminated ground water. This is not the corruption but our experts are the "his master voice" of the foreign experts.
There is also possible that contaminated ground water from upper catchment source also moving in downward gradient. The small rivers, beels, haors and ponds are drying up. Arsenite and arsenate are known as carcinogens and have an affinity to deposit in hair, nail, bone etc.
Pollution has already made the surface water of Dhanmondi, Gulshan-Baridhara and Ramna lakes unusable. The organic substances most frequently reported in groundwater as resulting from waste disposal in decreasing order of occurrence, are: The main sources of noise pollution are industries, motorized vehicles, construction works and indiscriminate use of loudspeaker.
The remaining has to be extracted from groundwater sources. But it has miserably failed to perform its task of supplying safe water.
Billions of dollar has been spent to ensure safe water. Currently, 85 percent of the total demand of city water is met through groundwater sources as most of the surface water is contaminated, according to Dhaka Water and Sewerage Authority Wasa.
Movements by environmentalists as well as demands by the civil society could not change the situation.
Its soils are varied: Industries cause air and water pollution through smoke emission, inadequate solid waste management and dumping of untreated effluent to lakes, rivers and ground water. Dhaka City is one of the most polluted cities in the world.
However, the real number is much higher than the statistics, and among all these the dyeing factories and tanneries are the main polluters of the rivers.
Aging underground Storage Tanks Possibly as many as 7 million steel tanks are used to store petroleum products, acids, chemicals, industrial solvents and other types of waste underground.
Bangladesh is suffering from one of the world’s worst cases of groundwater contamination by dissolved arsenic. Whilst about 35 million people of the country are drinking high arsenic groundwater, Dhaka, the capital of Bangladesh, is apparently free of arsenic contamination.
The contamination of groundwater by arsenic in Bangladesh is one of the largest poisoning of a population in the history. The scale of this environmental poisoning disaster is greater than any seen before. Water Pollution Water is considered polluted when it is altered from the natural state in its physical condition, and chemical and microbiological composition, so that it becomes unsuitable or less suitable for any safe and beneficial consumption.
The term contamination is used synonymously with pollution. Added to this pollution, fecal pollution is by far the most serious water contamination problem, while water and air pollution is causing increasing concern in the rapidly growing urban areas.
A recent incident of pollution of ground water by arsenic creates an alarming situation for the country's public health. Bangladesh is suffering from one of the world’s worst cases of groundwater contamination by dissolved arsenic. Whilst about 35 million people of the country are drinking high arsenic groundwater, Dhaka, the capital of Bangladesh, is apparently free of arsenic contamination.
Arsenic contamination of the groundwater in Bangladesh is a serious problem. Prior to the s, Bangladesh had one of the highest infant mortality rates in the world.
Ineffective water purification and sewage systems as well as periodic monsoons and flooding exacerbated these problems.Groundwater pollution in bangladesh