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Water that is rich in lather mixed with oil, blackbrown water that goes down the drain from sink, showers, toilets, laundries is dirty is called waste water. Dec, 2012 wastewater is generated in homes, industries, agricultural fields and in other human activities. Ncert solutions for class 7 science chapter 17 forests. The story of ddt as vividly told in rachel carsons silent spring 1962 is. As such, the chemical composition of wastewater naturally reflects the origin from which it came. Cbse notes, ncert books solutions question and answers. Disposal of wastes and wastewater without treatment is no longer an option. Wastewater treatment its journey to treatment and return to the environment 2. Generally, industrial wastewater can be divided into two types. This chapter explains the condition of forests, their importance, and effects of their depletion on the environment and mankind, different types of flora and fauna, maintaining the balance of nature. You dont know how to speak english doing aaa a a first you try to speak english then strat explaining chapter. Winner of the standing ovation award for best powerpoint templates from presentations magazine.
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