Essay on water pollution in hindi

Despite the seemingly dismal outlook for waterways, international aid and governmental efforts are giving hope for local rehabilitation in some areas. For example, the Pasig River in the Philippines received industrial wastes, municipal solid wastes, and garbage. By the early 1990s, the river was considered biologically inactive and had dangerously high counts of fecal coliform . The river was a dark, murky color, and large rafts of floating garbage covered the surface of many river segments. Sunken boats and abandoned barges made navigation difficult and hazardous. Factories and makeshift shacks lined long stretches of the riverbank, as well as tributaries and estuaries . With help from assistance grants from the government of Denmark and the Asian Development Bank, the Pasig River Rehabilitation Commission was established in 1999 by an executive order from Philippines president Joseph Estrada. The government's goal is to upgrade the river's quality so it can sustain aquatic life and can be used for recreation by 2008.

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k. Deep sea mining is a relatively new mineral retrieval process that takes place on the ocean floor. Ocean mining sites are usually done at about 1,400 – 3,700 meters below the ocean’s surface. The vents create sulfide deposits, which contain precious metals such as silver, gold, copper, manganese, cobalt, and zinc. These raise questions about environment damage to surrounding areas. Removal of parts of the sea floor will result in disturbances to the benthic layer, and habitat of benthic organisms. Beside from direct impact of mining the area, leakage, spills and corrosion would alter the mining area’s chemical makeup.

Water pollution by organic wastes is measured in terms of bio-chemical oxygen demand (BOD). BOD is defined as the amount of oxygen required by microorganisms to stabilize decomposable organic matter in waste under aerobic condition. It is oxygen required in milligrams for five days to metabolise waste present in one litre of water at 20°C. A weak organic waste will have BOD below 1500 mg/litre, medium between 1500—1400 mg/litre while a strong waste above it. Since BOD is limited to organic wastes, it is not a reliable method of measuring water pollution. Another slightly better mode is COD or chemical oxygen demand. It measures all oxygen consuming pollutant materials present in water.

We also can help nature to purify the air. We all know that plant have a great protection function; they help us make this world a little bit cleaner, protecting from harmful substances. It means that we should plant and grow more greenery. In such a way we will make our world safer and cleaner. Besides, coniferous plants influence positively human health producing essential oils. It is a must to grow the plant to protect yourself from pollution. If you do not have possibility to plant a tree at your house, at least you can buy home plant and you will have your own clean world inside your home.

Essay on water pollution in hindi

essay on water pollution in hindi

Water pollution by organic wastes is measured in terms of bio-chemical oxygen demand (BOD). BOD is defined as the amount of oxygen required by microorganisms to stabilize decomposable organic matter in waste under aerobic condition. It is oxygen required in milligrams for five days to metabolise waste present in one litre of water at 20°C. A weak organic waste will have BOD below 1500 mg/litre, medium between 1500—1400 mg/litre while a strong waste above it. Since BOD is limited to organic wastes, it is not a reliable method of measuring water pollution. Another slightly better mode is COD or chemical oxygen demand. It measures all oxygen consuming pollutant materials present in water.

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