Septic Tanks.

Septic Tanks.

Traditional septic tanks

Traditional septic tanks

The septic tank has been used in one form or another for at least 3000 years. 

In New Zealand the traditional septic tank has received the solid and liquid waste from 

toilets, baths, showers and sinks (combined black water and grey water). The tank 

processes that and eventually discharges effluent (liquid) to either a soak-hole, or a piped 

system buried in a gravel trench, from where it soaks into the ground water. 

The following diagram gives an overall view of the septic tank and its piped trench system 

disposal field.

Multiple Choice

Who is allowed to install a septic tank?

• a drainlayer

• a plumber

• a licenced builder

• a home owner

• approved licenced drainage contractor

Multiple Select

What happens to the effluent from the septic tank?

• It drains into the ground via a soak hole.

• It is pumped to the closest sewer drain.

• It evaporates inside the tank leaving the solids behind.

• it is pumped or gravity feed into the effluent field.

Now watch the following video on Secondary Treatment Systems

Self Check #1

Open Ended

Give a brief description of how it works

Multiple Select

Select the best installation requirements you need to think about before installing this system

• Tank location relative to services

• Dripper line placement

• Site hazards

• All of these

• Positions of fixtures in the house

Multiple Choice

What base layer thickness is required for the tank to sit on

• 100mm of sand

• 100mm of shingle

• 50mm of Gap 40

• 50mm of shingle

Multiple Choice

What is the approximate weight of the Airtech 9000

• 600kg

• 600 litres

• 650

• 1600 kg

Multiple Select

How far should the shingle be placed

• Up to the level shown

• Up to the moulding mark on the tank

• Upto the full height of the tank

• Upto 600mm below the seismic strap

Self Check #2

Multiple Select

Why is the digger operator doing this

• Because it is the best way to start backfilling

• To make sure it sites the tank evenly

• To make sure there are no voids when backfilling

• All of the above

Multiple Select

What components should be checked once the tank is backfilled prior to hook up

• The bio filter for any silt or shingle

• The media filter is located properly

• The pump has not moved

• The wiring is complete

• All of the above

Multiple Choice

What does this product do

• Disinfects the tank prior to use

• Kickstart agent for the system

• Encourages mould to grow

• All of the above

Read through the brochure to help you answer the self check questions

Open Ended

What household items can you NOT flush down the system

Multiple Choice

How often should the filter be cleaned

• Every six months

• Every one month

• Annually

Open Ended

What role does the blower perform

Multiple Choice

The airtech 9000 uses a gravity system for the effluent/ dripper line dispersal

• TRUE

• FALSE

Multiple Select

What two alarm warnings does the Airtech Smartalarm give?

• High temperature

• High water

• Blower fault

• Aerobic fault

• Aeration fault

Well Done !

Thank you for completing this lesson