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Question
What is sewage? How does sewage cause degeneration of water quality? [3 MARKS]
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Solution
Definition: 1 Mark
Explanation: 2 Marks
Sewage is a liquid waste released by homes, industries, hospitals, offices and other users. It also includes rainwater that has run down the street during a storm or heavy rain.
Sewage water contains harmful substances with it which washes off roads and rooftops. It is a complex
mixture containing suspended solids, organic and inorganic impurities, nutrients, saprotrophic and disease causing bacteria and other microbes. So, if the untreated sewage is discharged into rivers and seas, it will pollute the water resources, affect aquatic life. The contaminants of sewage degenerate the water quality to such an extent that they become the bacterial home for dreaded diseases like cholera, typhois, polio, meningitis. malaria and dengue.
Explanation: 2 Marks
Sewage is a liquid waste released by homes, industries, hospitals, offices and other users. It also includes rainwater that has run down the street during a storm or heavy rain.
Sewage water contains harmful substances with it which washes off roads and rooftops. It is a complex
mixture containing suspended solids, organic and inorganic impurities, nutrients, saprotrophic and disease causing bacteria and other microbes. So, if the untreated sewage is discharged into rivers and seas, it will pollute the water resources, affect aquatic life. The contaminants of sewage degenerate the water quality to such an extent that they become the bacterial home for dreaded diseases like cholera, typhois, polio, meningitis. malaria and dengue.
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