Unit 9 - Environmental Engineering

Match the following terms with the definitions

• process by which photons break chemical bonds

• photodissociation

• disperse or scatter

• ozone layer

• substance used to lower the temperature

• coolant

• Earth's shield against UV radiation

• anthropogenic

• originating from human activity

• dissipate

Which greenhouse gas is identified as the largest contributor to global warming?

• Nitrous oxide

• Methane

• Carbon dioxide

• Chlorofluorocarbons

The early history of science included contributions from which civilizations?

• Roman and Chinese

• Greek and Arab

• Egyptian and Indian

• Mayan and Persian

Which of the following are sources of water in the water supply cycle?

• Oceans and glaciers

• Lakes and rivers

• Surface water and groundwater

• Aquifers and rainfall

Organize these options into the right categories

Groups:

(a) natural

,

(b) processed

,

(c) both natural & processed

• Surface

• Waste

• Potable

• Brackist

• Saline

• Distilled

• Ground

• Desalinated

• Fresh

Ground water refers to the water from rain, snow, flooding, etc., that soaks into the Earth’s surface, forming ________________________ streams and aquifers (which supply water for wells

Desalinated water is the water from any process that removes excess salt and other ___________________________ to make it suitable for drinking, irrigation or certain industrial processes

Distilled water is the water heated to ​ (a)   , vaporized, ​ (b)   and then ​ (c)   in order to remove impurities; commonly used in automotive cooling systems and ​ (d)   ; can also be used as ​ (e)  

• boiling point
• cooled
• condensed
• batteries
• drinking water

Reorder the following stages of reverse osmosis

• Reverse osmosis

• Post-treatment

• Pre-treatment of feedwater

• Wastewater discharge

What is the purpose of reverse osmosis in desalination plants?

• To filter out 100% of impurities

• To filter out 95–99% of impurities, including salt and other dissolved substances

• To increase the salt content of water

• To remove only large particles from water