CWS Water Treatment Equipment & Technologies

Question 1

What is the primary function of a reverse osmosis (RO) system?

Accepted Answer

Removes dissolved impurities

Answer

The primary function of a reverse osmosis (RO) system is to remove a wide range of dissolved impurities from water. It works by forcing water through a semi-permeable membrane, which allows water molecules to pass through while rejecting most dissolved salts, minerals, and other contaminants. This process effectively purifies water, making it ideal for drinking and other sensitive applications.

Question 2

Which equipment is used to reduce water hardness?

Accepted Answer

Water softener

Answer

A water softener is specifically designed to reduce water hardness by removing calcium and magnesium ions. It typically uses an ion-exchange resin to replace these hard minerals with sodium or potassium ions, preventing scale buildup and improving the effectiveness of soaps and detergents. This equipment is essential for homes and businesses in areas with hard water.

Question 3

What does an activated carbon filter primarily remove?

Accepted Answer

Chlorine and odors

Answer

Activated carbon filters primarily remove contaminants through adsorption, where substances like chlorine, chloramines, volatile organic compounds (VOCs), and other taste/odor-causing compounds stick to the carbon's surface. This process significantly improves the water's taste and smell. While it can remove some larger organic molecules, its main function is not for minerals, heavy metals, or pathogens.

Question 4

Which system is designed to kill bacteria and viruses in water?

Accepted Answer

UV disinfection unit

Answer

UV disinfection units utilize ultraviolet light to effectively kill or inactivate bacteria, viruses, and other microorganisms by disrupting their DNA or RNA. This prevents them from reproducing and causing illness, providing a chemical-free method of sterilization. Other systems like sediment filters, ion exchange, and carbon filters do not have the primary function of killing pathogens.

Question 5

What type of filter is best for removing particulate matter?

Accepted Answer

Sediment filter

Answer

Sediment filters are specifically designed to physically remove suspended solids from water, such as dirt, rust, sand, and silt. They act as a crucial pre-filter, protecting other more sensitive filtration components from premature clogging. While other filters remove different types of contaminants, the sediment filter's primary role is particulate matter removal.

(CWS) Certified Water Specialist Practice Test

(CWS) Certified Water Specialist Practice Test

CWS Water Treatment Equipment & Technologies