Answer anyone 3 questions:-
1. How much of wastewater is generated in your residential complex?
2. What is sewage?
3. Give examples of some contaminants present in sewage?
4. What are the common methods used for sewage treatment?
Answers
Answer:
ans 1) Used water from toilets, showers, baths, kitchen sinks, laundries and industrial processes is known as wastewater. Domestic households produce an average of 200–300L of wastewater per person every day! Ninety-nine percent of this wastewater is water, the other one percent is the contaminating waste.
ans 2)Sewage is waste matter such as faeces or dirty water from homes and factories, which flows away through sewers
ans 3) Domestic households, industrial and agricultural practices produce wastewater that can cause pollution of many lakes and rivers. Sewage is the term used for wastewater that often contains faeces, urine and laundry waste. There are billions of people on Earth, so treating sewage is a big priority.
ans 4)Four common ways to treat wastewater include physical water treatment, biological water treatment, chemical treatment, and sludge treatment. Let us learn about these processes in detail. In this stage, physical methods are used for cleaning the wastewater.