PRESENTATION ON WATER POLLUTION IN Bangladesh PRESENTERS: BISHWAJIT ROY REJWAN ANIK MUSHFIQ AYON RAKIB HASAN BADHAN

Water pollution in Bangladesh WHAT IS WATER POLLUTION HOW DOES IT GET POLLUTED

PRESENT SITUATION IN BANGLADESH Rapid industrialization People living in the slum polluting water Farming chemicals and oil spills by boats Chemically polluted fish and water itself causes many health issues

Causes Of water Pollution Some causes of water pollutions: Industrial waste Agricultural pollution Sewage Oil pollution Airborne pollutants

Industrial waste industries produce highly toxic waste which too often ends up in rivers. such as the tanneries in south-western part of Dhaka city, most industries discharge liquid waste without treatment. some factories release toxic chemicals into rivers.

Agricultural pollution Liquid manure (slurry) and pesticides are the greatest agricultural pollutants Slurry, which contains phosphates, nitrates etc. it causes eutrophication in which the algae overgrow other water plant species. Increased bacterial activity leads to oxygen reduction which in turn can cause mass fish death. Pesticides are severely toxic to most terrestrial and aquatic creatures and have the same effect as other hazardous chemicals.

Sewage Most of sewage ends up in rivers. Phosphates and food nutrients from the sewage remain a serious water pollutant Sewage contains all kinds of toxic chemicals which are flushed down the toilets and drains. Human waste may contain viruses, bacteria and parasites which often spread into the waters, i.e. cholera etc.

Oil pollution Airborne pollutants poses a constant risk of oil spills. pouring used car oil into drains or directly into rivers. Airborne pollutants Dangerous chemicals released into the air, from kilns used to make bricks for instance, can fall back on earth with rain and pollute the water. Nitrogen oxides and sulphur oxides released from car exhaust and industries produces acid vapor and fall back as acid rain which imbalances the ph of the rivers water.

Water pollution effects in Bangladesh

How does water pollution occur? Mankind through socio-economic activities introduce pollutants to the environment. “Then the Earth’s waters cycle, carry and spread the pollutants all around the planet.”

Human activities that contribute to water pollution Overgrazing Poor agricultural land management Removal of riparian vegetation Sewage, industrial, and domestic discharges Construction, Mining Release of gases and aerosols to the atmosphere Mismanagement of reservoirs Accidental spills

Effects of polluted water on; Effects on Agriculture;-use of wastewater and polluted surface and groundwater which contaminate crops and transmit disease to consumers and farm workers; Depositions of deleterious chemicals in soil leading to loss of soil fertility;

Effects of polluted water on; 2. Effects on Environment/ecosystems;-pungent smell,discolourisation;increasedtemps;contamination; change the pH; decreased oxygen; detergents that create a mass of white foam in the river waters; Enrichment of groundwater with salts, nutrients from irrigated lands; eutrophication/algal blooms-what is the effect on recreational activities, water treatment plants/water providers; loss of aesthetic value; Algae clogs our waterways

Effects of polluted water on; 4. Domestic effects;-toxic substances such as lead, mercury, cadmium, and chromium or cyanide, which may affect the use of the receiving water for domestic use or for aquatic life.

Effects of polluted water on; 5. Effects on industry; boiler scales, Heavy metals cause unpleasant taste and odour to drinking water; Suspended particles cause unpleasant taste & discoloration to drinking water;

Effects of polluted water on; 6. Economy Adverse effects of water pollution lead to economic losses in terms of reduced health, reduced agricultural productivity, and low-quality tourism. There is also economic losses to family income due to the desire for safe bottled water which is more expensive than unbolted water. When water is polluted, fish and other aquatic resources can perish, which leads to a decline in fisheries production. Erosion from degraded uplands and pollution from silt and sedimentation, as well as untreated sewerage, cause productivity losses in fisheries. Silt and sedimentation are major causes for losses in fishery production.

Effects of polluted water on; 8. Effects on human health; Diseases 1. Water borne (Disease causing vector carried in water) Cholera Typhoid Diarrhoea Dysentery

Effects on human health 2 Water washed (Resulting from lack of water or improper use of water) Scabies Eye infections Diarrhoea

Effects on human health 3 Water Based (Vector lives in water) Bilharzias 4 Insect vector related Malaria River blindness

Effects on human health

Uttara lake

Solutions of Water Pollution Reduced pesticide pollution. Reduced sewage pollution. Watershed monitoring. Stopping deforestation. Fight global warming.

Conclusion There are just a few ways that people can help stop water pollution. This solutions are affordable and reachable. There are also essential to our future well being.