Singapore Waste Management Case Study Flashcards
1
Q
How much has disposable waste risen from 1970 to 2016
A
1,260 tonnes per day in 1970 to 8,559 tonnes per day in 2016
2
Q
What did the NEA decide to do
A
They decided to do more waste to energy incineration as it can reduce waste volume by 90%
3
Q
Semakau landfill background info
A
- 8km south of Singapore
- is 350 hectares in total
- it is Singapore’s only landfill site and is meant to last till 2040
4
Q
How does the landfill site operate
A
- large excavators remove the waste from barges and the waste is then placed on a 35 tonne payload off-road rump
- a 10m wide roadway provides access to all sections of the landfill
- dump trucks unload the ash into a landfill cell
- each cell is covered in a layer of earth once it reaches ground level to encourage a green landscape via the development of vegetation
5
Q
How many plants, animals and endangered species is semakau home to
A
700
6
Q
How many tonnes of solid waste is sent to the landfill site per year
A
20,000 tonnes
7
Q
What percent of Singapore’s waste is buried in landfill
A
10%
8
Q
How does the incineration work
A
- The heat from the process is used to generate steam in boilers
- the steam is used to drive turbogenerators to produce electricity
- high capacity rotary workers are used to breakdown wastes so they are suitable for incineration
- after incineration, ferrous scrap metal contained in the ash is recovered and sold to a local steel mill for recycling
9
Q
How much do the 4 incineration plants in Singapore reduce waster
A
They reduce waste by 90% so only 10% is left
