Question

Three statements are provided here which define the terms. Pick out the correct definition for each of these terms.

Column 1	Column 2
Sludge	The settled solids that are removed in wastewater treatment with a scraper
Sewage	Water from the kitchen used for washing dishes
Wastewater	Wastewater is released from homes, industries, hospitals, and other public buildings.

Answer 1

a. Sludge (i)The settled solids that are removed in wastewater treatment with a scraper.

1. Sludge is a semi-solid slurry that is produced as a result of water treatment.
2. It includes suspended solids carried by water and other trace elements.

b. Sewage (iii) Wastewater is released from homes, industries, hospitals, and other public buildings.

1. Sewage is the wastewater discharged from residences and commercial institutions.
2. It contains dissolved and suspended solids such as proteins, carbohydrates, oils, and grease.

c. Wastewater (ii) Water from the kitchen used for washing dishes

1. Wastewater is the used water generated as a result of domestic, industrial, commercial, and agricultural activities.
2. It contains 99.9% water and 0.1% of organic matter, microorganisms, and inorganic compounds.

Column I	Column II
a. Sludge	i. The settled solids that are removed in wastewater treatment with a scraper.
b. Sewage	iii. Wastewater is released from homes, industries, hospitals, and other public buildings.
c. Wastewater	ii. Water from the kitchen used for washing dishes.