Question
Describe broad characteristics of the untreated sewage giving examples.
Answer :
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Untreated sewage typically contains a mix of organic waste, pathogens, chemicals, and various solids that have not undergone any treatment processes to remove harmful contaminants. It often includes human waste, food scraps, and wastewater from households, industries, and agriculture. The primary characteristics of untreated sewage are high levels of biological oxygen demand (BOD) and chemical oxygen demand (COD), which indicate the presence of organic materials that require significant oxygen for decomposition. Pathogens such as bacteria, viruses, and parasites are also commonly found
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