Unit 9 - Environmental Engineering

Match the following terms with the definitions

• disperse or scatter

• dissipate

• substance used to lower the temperature

• ozone layer

• originating from human activity

• coolant

• Earth's shield against UV radiation

• anthropogenic

• process by which photons break chemical bonds

• photodissociation

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

• Saline

• Desalinated

• Brackist

• Surface

• Fresh

• Distilled

• Potable

• Ground

• Waste

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

Desalinated water is the water from any process that removes excess salt and other (a)   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

• Wastewater discharge

• Post-treatment

• Pre-treatment of feedwater

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