Photo Gallery for Waste not wasted - the science of waste at Kate Valley

Andrew and the ambassadors with Rangi on the final field trip web conference with schools. Image: Shelley Hersey, LEARNZ.

This is known as a spray curtain. It emits a spray that neutralises odour. This helps Kate Valley Landfill to be a good neighbour! Image: Andrew Penny, LEARNZ.

This pipe takes landfill gas to the generators, which use it for fuel to generate electricity. Can you see where the pipe goes? Image: Andrew Penny, LEARNZ.

Here you can see some more pipes that take the landfill gas to the flare compound. How is the gas taken out of the rubbish? Image: Andrew Penny, LEARNZ.

The blue engines are like big vacuum cleaner motors, as they suck all the gases out of the landfill. To the right you can see a cylinder which separates water and solids from the gas. Why do you think these need to be removed? Image: Andrew Penny, LEARNZ.

This big chimney is the flare. Excess gases are burnt here so nothing harmful enters the atmosphere. How hot do you think it needs to be? Image: Andrew Penny, LEARNZ.

What is the main gas used to run these four large generators that produce electricity? Image: Andrew Penny, LEARNZ.

Rangi gave you a look at one of the engines inside the container which houses the generator. Image: Andrew Penny, LEARNZ.

This is a transformer. You might like to research what its job is. Image: Andrew Penny, LEARNZ.

The ambassadors and I have enjoyed our time at Kate Valley with Rangi and the team. What key ideas are you able to reflect on to investigate further? Image: Shelley Hersey, LEARNZ.

Andrew and the ambassadors listen as Rangi answers another question on this morning's web conference. Image: Shelley Hersey, LEARNZ.

A digger unearths some waste for us to inspect. It has been sitting underground for about 10 years. Image: Andrew Penny, LEARNZ.

This is the trench left from the digger which gives you a good idea of the level of soil cover sitting on top. Do you think this is an intermediate cover or a final cover? Image: Andrew Penny, LEARNZ.

This is an example of waste after about 10 years. Can you identify the organic and inorganic waste? Image: Andrew Penny, LEARNZ.

Here is a recently unloaded bin of waste. What are the main differences you can see compared with the previous image? Image: Andrew Penny, LEARNZ.

Bin audits happen on a regular basis. How does knowing what is coming into the landfill help? Image: Andrew Penny, LEARNZ.

A digger works on daily soil cover on today's offloaded waste at Kate Valley. What is the benefit of daily cover? Image: Andrew Penny, LEARNZ.

This bulldozer is finishing off some intermediate cover on an area of landfill that won't receive any waste for a while. Image: Andrew Penny, LEARNZ.

Once intermediate or final cover is complete, grass is sown on top. How might the grass help these areas? Image: Andrew Penny, LEARNZ.

Gas wells around the landfill collect landfill gas. How is the gas produced? Image: Andrew Penny, LEARNZ.

Andrew and the ambassadors with Rangi on this morning's web conference. Image: Shelley Hersey, LEARNZ.

A view from inside the cab of one of the CWS truck-and-trailer units that haul waste from the transfer station to Kate Valley Landfill. Image: Andrew Penny, LEARNZ.

Trucks are weighed on a weigh bridge before entering the landfill. How does knowing the weight of each truck help? Image: Andrew Penny, LEARNZ.

The blue bins are set down. These trucks then take two empty bins back to the transfer station. Image: Andrew Penny, LEARNZ.

A special 8-wheel drive truck picks up a blue bin and takes the waste to the tipping face. Image: Andrew Penny, LEARNZ.

The blue bin is finally emptied into the landfill. Image: Andrew Penny, LEARNZ.

A large bulldozer spreads the waste, and another bulldozer compacts it. Image: Andrew Penny, LEARNZ.

Leachate is collected from the landfill and kept in holding tanks before being treated. Image: Andrew Penny, LEARNZ.

Here you can see the different layers that make up the landfill liner. Why is the liner so important? Image: Andrew Penny, LEARNZ.

Wells outside the landfill enable samples to be taken from groundwater. What can samples from the groundwater show? Image: Andrew Penny, LEARNZ.

Andrew and the ambassadors arrive at Bay of Islands/Te Pēwhairangi airport. Image: Karren Penny.

The Bombardier Q300 awaits its passengers at Kerikeri airport. Image: Andrew Penny, LEARNZ.

A view of Auckland City before landing at Auckland airport. I wonder how many tonnes of waste are produced in Auckland, New Zealand's largest city, each day. Image: Andrew Penny, LEARNZ.

Ready for take-off on the runway at Auckland Airport! Image: Andrew Penny, LEARNZ.

A view of the Manukau Heads before turning for the journey south. Image: Andrew Penny, LEARNZ.

Looking out over to Farewell Spit/Onetahua. Image: Andrew Penny, LEARNZ.

Despite the very hot temperatures around the country there is still some snow on the Southern Alps/Te Tiritiri-o-te-moana. Image: Andrew Penny, LEARNZ.

On our descent to Christchurch we got a good view up the Waimakariri River. Image: Andrew Penny, LEARNZ.

Andrew and the ambassadors have arrived at Christchurch airport. Image: Shelley Hersey, LEARNZ.

Welcome to Amberley everyone! Image: Shelley Hersey, LEARNZ.