Waste water management Worksheet-2

Waste water management Worksheet-2

Match the following:

Fill in the blanks:

1. All the wastewater that is released from various sources forms the sewage which contains suspended impurities called _____.
2. An excessive growth or 'blooms' of algae in lakes rich in nutrients such as phosphates is called _____.
3. The wastewater is passed through a grit and sand removal tank called the ______.

True False:

1. Sources of wastewater are households, industry, mining, and agriculture.
2. The low cost on-site sanitation system can be adopted when underground sewerage systems and refuse disposal systems are not available.
3. We should defecate in the open and we should have safe disposal of excreta by high cost methods.
4. Open drain system is not considered as a breeding place for flies, mosquitoes and organisms which cause diseases.
5. By-products of wastewater treatment are sludge and biogas.
6. Treatment plants reduce pollutants in wastewater to a level where nature can take care of it.
7. Inside the water treatment plant, wastewater is treated in two stages; primary and secondary.
8. Sewage is a liquid waste which causes water and soil pollution.
9. The treated water which is released into water bodies cannot be used again for supplying drinking water, fertilizers for growing crops, and for aquaculture.
10. Wastewater is generated in homes, industries, agricultural fields and in other human activities.

Answer key:

Match the following:

(A-Q), (B-S), (C-P), (D-T), (E-R), (F-V), (G-W), (H-U)

Fill in the blanks:

1. Contaminant/s
2. Eutrophication
3. grit chamber

True False:

1. T
2. T
3. F
4. F
5. T
6. T
7. F
8. T
9. F
10. T