Water in its natural state is never

Water in its natural state is never 100 percent pure. As soon as it condenses as rain, water begins gathering impurities until purified or until it evaporates. Much of this impurity is not sufficient to spoil the usefulness of water; some materials and substances, however, do limit its usefulness.By definition «water pollution* we mean the presence in water of any substance that interferes with any of its legitimate uses - for public water supplies, recreation, agriculture, industry, the preservation of fish and esthetic purposes.The principal forms of water pollution are domestic, industrial and agricultural wastes. Domestic wastes include sewage, detergents and everything else going down the drains of a city into its sewer system - used water from toilets, bathtubs, sinks and washings from restaurants, laundries, hospitals and hotels and other businesses.Industrial wastes are the acids, oils, greases, other chemicals and animal and vegetable matter discharged by factories. These wastes are discharged either through sewer system or through separate outlets directly into waterways. Agricultural wastes include pesticides (insecticides, fungicides and herbicides), fertilizers (mainly nitrates and phosphates) and animal wastes. In addition to these principal forms, other pollutants such as heat and radioactive substances, can contribute to water pollution.The extent of pollution in a given body of water can be measured to some degree by the amount of organic wastes it contains. Organic wastes can generally be destroyed by biochemical action, either naturally in a free-flowing stream or artificially in a waste treatment plant. Not all pollutants can be removed by such action, however; examples include minerals and acids from industrial operations or mining. Such pollutants as radioactive substances, pesticides, detergents and various oil products are highly resistant to breakdown and must be specially treated.

Результаты (казахский) 1:

Water in its natural state is never 100 percent pure. As soon as it condenses as rain, water begins gathering impurities until purified or until it evaporates. Much of this impurity is not sufficient to spoil the usefulness of water; some materials and substances, however, do limit its usefulness.

By definition «water pollution* we mean the presence in water of any substance that interferes with any of its legitimate uses - for public water supplies, recreation, agriculture, industry, the preservation of fish and esthetic purposes.

The principal forms of water pollution are domestic, industrial and agricultural wastes. Domestic wastes include sewage, detergents and everything else going down the drains of a city into its sewer system - used water from toilets, bathtubs, sinks and washings from restaurants, laundries, hospitals and hotels and other businesses.

Industrial wastes are the acids, oils, greases, other chemicals and animal and vegetable matter discharged by factories. These wastes are discharged either through sewer system or through separate outlets directly into waterways. Agricultural wastes include pesticides (insecticides, fungicides and herbicides), fertilizers (mainly nitrates and phosphates) and animal wastes. In addition to these principal forms, other pollutants such as heat and radioactive substances, can contribute to water pollution.

су берілген органға ластану көлемі ол бар органикалық қалдықтардың көлемiн кейбір дәрежеде өлшенуі мүмкін. Органикалық қалдықтарды, әдетте, биохимиялық іс-әрекет арқылы, не табиғи шәшылатын толқынында немесе жасанды қалдықтарды өңдеу зауытында бұзылған болуы мүмкін. Емес, барлық ластаушы алайда, мұндай іс-әрекет арқылы шығарып алуға болады; мысалдар өнеркәсіптік операциялар немесе тау-кен минералдар мен қышқылдар кіреді. радиоактивті заттар, пестицидтер, жуғыш және түрлі мұнай өнімдері сияқты ластаушы заттар тесіп жоғары төзімді болып табылады және арнайы өңделген болуы тиіс.