Q3 of 12 Page 228

Why should oils and fats be not released in the drain? Explain.

Oil and fats harden and block the sewage pipes. In an open drain the fats block the soil pores reducing its effectiveness in filtering water. That’s why oil and fats should not be released in the drain.


More from this chapter

All 12 →
1

Fill in the blanks:

a. Cleaning of water is process of removing_____.


b. Wastewater released by houses is called_____.


c. Dried _______ is used as manure.


d. Drains get blocked by ______ and _______.

 2

What is sewage? Explain why it is harmful to discharge untreated sewage into rivers or seas.

 4

Describe the steps involved in getting clarified water from wastewater.

 5

What is sludge? Explain how it is treated.