Sewage Treatment Process Overview

The video is a virtual tour of the first tertiary sewage treatment plant in Hong Kong, located near popular tourist attractions on Lantau Island. It explains the need for sewage treatment due to increased tourist activity and details the processes involved in preliminary, secondary, and tertiary treatments. The tour is guided by Crystal and her assistants, micro submarines DST-1 and DSD2, who explore various treatment stages, including mechanical screening, grit and grease removal, biological treatment in a Sequential Batch Reactor (SBR), and sludge treatment. The video concludes with the final purification steps, ensuring the treated effluent is safe for use.

What is the main purpose of the tertiary sewage treatment plant introduced in the video?

• To replace the existing sewage system

• To build a new tourist attraction

• To treat sewage and protect the water gathering ground

• To increase tourism in Hong Kong

What is the function of the mechanical screen in the preliminary treatment process?

• To separate grease from water

• To remove microorganisms

• To filter out large solid wastes

• To add chemicals to the sewage

How does the grit removal chamber work?

• By using centrifugal force to isolate sand particles

• By using a chemical reaction

• By adding bacteria to the sewage

• By heating the sewage

What is the role of microorganisms in the Sequential Batch Reactor (SBR)?

• To digest organic matter and form biomass

• To increase the temperature of the sewage

• To remove sand particles

• To add color to the sewage

What happens to the sludge after it is separated in the SBR?

• It is stored in tanks indefinitely

• It is used as fertilizer

• It is taken away for further treatment

• It is released into the ocean

What is the purpose of the sludge thickener?

• To remove microorganisms

• To add water to the sludge

• To heat the sludge

• To settle heavy materials at the bottom

How long does the sludge digestion process take?

• 1 day

• 5 days

• 10 days

• 15 days

What is the function of the dual media filter in the tertiary treatment process?

• To add chemicals to the sewage

• To remove very fine particles

• To increase the temperature of the sewage

• To add microorganisms to the sewage

What is the purpose of the UV laser cannon in the treatment process?

• To add color to the sewage

• To remove sand particles

• To increase the temperature of the sewage

• To destroy invisible germs and microorganisms

What is the final step in the tertiary sewage treatment process?

• Adding microorganisms

• Heating the sewage

• Chlorination to make the effluent safe for use

• Releasing the effluent into the ocean