CBSE Class 7 > Class 7 Notes > Science (Old NCERT) > PPT Wastewater Story - Science Class 7 (Old NCERT)
PPT Wastewater Story - Science Class 7 (Old NCERT)
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Page 1 W A S T E W A T E R S T O R Y Page 2 W A S T E W A T E R S T O R Y WHAT IS WASTE WATER? The water which gets contaminated after various works; like washing, bathing, mopping, etc. is called wastewater. World Water Day: 22nd March Page 3 W A S T E W A T E R S T O R Y WHAT IS WASTE WATER? The water which gets contaminated after various works; like washing, bathing, mopping, etc. is called wastewater. World Water Day: 22nd March S E W A GE Sewage is a complex mixture containing suspended solids, organic and inorganic impurities, nutrients, saprotrophic and disease causing bacteria and other microbes. Page 4 W A S T E W A T E R S T O R Y WHAT IS WASTE WATER? The water which gets contaminated after various works; like washing, bathing, mopping, etc. is called wastewater. World Water Day: 22nd March S E W A GE Sewage is a complex mixture containing suspended solids, organic and inorganic impurities, nutrients, saprotrophic and disease causing bacteria and other microbes. WHAT DOES SEWAGE CONTAIN? Organic impurities- Human faeces, animal waste, oil , urea (urine), pesticides, herbicides, fruit and vegetable waste, etc. Inorganic impurities- Nitrates, Phosphates, metals. Nutrients Phosphorus and Nitrogen. Bacteria Such as which cause cholera and typhoid. Other microbes - Such as which cause dysentery. Page 5 W A S T E W A T E R S T O R Y WHAT IS WASTE WATER? The water which gets contaminated after various works; like washing, bathing, mopping, etc. is called wastewater. World Water Day: 22nd March S E W A GE Sewage is a complex mixture containing suspended solids, organic and inorganic impurities, nutrients, saprotrophic and disease causing bacteria and other microbes. WHAT DOES SEWAGE CONTAIN? Organic impurities- Human faeces, animal waste, oil , urea (urine), pesticides, herbicides, fruit and vegetable waste, etc. Inorganic impurities- Nitrates, Phosphates, metals. Nutrients Phosphorus and Nitrogen. Bacteria Such as which cause cholera and typhoid. Other microbes - Such as which cause dysentery. WHAT IS SEWER? The pipe which carries the wastewater is called sewer.Read More
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