Test your knowledge

Question 1 of 8

Intermediate

Why is the life cycle cost of the pressurised wastewater system low?

There are only a few gravitation pipes outside the building and the excavation cost is low

The initial cost of the lifting station is lower compared with a pit and there are no gravitation pipes outside the building

The lifting station and the pipe system is maintenance-free

Question 2 of 8

Intermediate

Who has the financial responsibility in the case of flooding in most countries?

The building owner and the building designers

The government and the wastewater authorities

The building designers and the contractors

Question 3 of 8

Intermediate

Under which circumstances should you consider a pressurised wastewater system rather than a gravitation system

When there is a long distance between the building and the sewer main, when the sewer main is up-hill or when there are obstacles between the building and the sewer main.

When there is a long distance between the building and the sewer main or when the sewer main is located far below the building.

When there is a short distance between the building and the sewer main or there are obstacles between the building and sewer main.

Question 4 of 8

Intermediate

Which treatment is necessary for storm water?

It has to go through an oil/petrol separator

It has to go through a sand pressure

None – it is pumped directly to the recipient

Question 5 of 8

Intermediate

Of the three anti-flooding systems, why is the lifting station the superior system?

It is located outside the building which means bad odour is never a problem

The storage volume is high and it is easy to assemble and install

It is pre-assembled and its location inside the building makes it easily accessible for service. Furthermore, it offers maximum backflow and flooding protection

Question 6 of 8

Intermediate

What are the disadvantages of the traditional gravitation system?

Many gravitation pipes with a small diameter have to be installed outside the building and the inspection wells are expensive

Inspection wells are difficult to maintain and the initial cost of the pumping pit is high

Many gravitation pipes have to be installed outside the building and a great deal of excavation work is needed.

Question 7 of 8

Intermediate

Which method of backflow prevention has the following advantages: Offers maximum backflow and flooding protection: Is not sensitive to fat, grease, sands and solids in the water. Makes it possible to use sanitary facilities in case of backflow. Offers protection for paved areas. Can be connected to buildings’ storm water drains.

Anti-flooding valves

Pumping stations

Lifting stations

Question 8 of 8

Intermediate

What are the four most common types of wastewater from commercial buildings?

Wastewater, storm water, drainage water and wastewater from parking areas

Rainwater, wastewater, storm water and drainage water

Wastewater, storm water, air-conditioning wastewater and wastewater from parking areas

Question 8 of 8

Intermediate

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1: Why is the life cycle cost of the pressurised wastewater system low?

There are only a few gravitation pipes outside the building and the excavation cost is low