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Can of Worms! What Do I Know?What Do I Need to Know? Singapore generates a lot of waste Recycling reduces waste Some waste is recyclable: Food waste, plastics,

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Presentation on theme: "Can of Worms! What Do I Know?What Do I Need to Know? Singapore generates a lot of waste Recycling reduces waste Some waste is recyclable: Food waste, plastics,"— Presentation transcript:

1 Can of Worms! What Do I Know?What Do I Need to Know? Singapore generates a lot of waste Recycling reduces waste Some waste is recyclable: Food waste, plastics, paper, metal Waste needs to be disposed of properly: burning in incinerators, burying in landfills, composting Composting is a way of allowing nature to break down waste naturally, and end product is used as fertilizer. Earthworms can be used to recycle waste How much waste is generated? What kinds of waste? How is waste disposed of in Singapore? Is it eco-friendly? What do worms feed on? What exactly is composting? Does composting smell bad? What worm species are native to Singapore? Which approving body do we approach to bring in worms? How fast is this composting system? Will the system attract pests? Joan:“Hey, did you see that report that in Singapore, each of us produces more than 1,200 kg of waste each year?” Mike:“What? How can… are you sure?” Joan:“No no, really! Apparently, most of it is paper and cardboard waste.” Mike:“Huh? What happens to all that?” Joan:“I think the report said that it gets burnt to ash, and the ash is then dumped at an island called Pulau Semakau.” Mike:“Aiyoh, what a lot of smoke and fumes that will pollute the atmosphere!” Andy:“No, I know that our incineration plants are very advanced and burn at very high temperatures and so there is very little smoke or poisonous gases released. It also results in very fine ash that takes up far less space than the original trash.” Joan:“High heat? Wah… must use a lot of energy, ah?” Mike:“Yah, not ‘green’, right? Is there any eco-friendly way?” Andy:“I heard of some way to recycle waste using, er… worms.” Joan:“YUCK!” Mike:“GROSS! So smelly!” Andy:“Yah, but you want eco-friendly, right?! Anyway, it’s just regular earthworms or something, and after that you get fertilizer.” Mike:“So how come we don’t use this method?” Joan:“Hey, did you see that report that in Singapore, each of us produces more than 1,200 kg of waste each year?” Mike:“What? How can… are you sure?” Joan:“No no, really! Apparently, most of it is paper and cardboard waste.” Mike:“Huh? What happens to all that?” Joan:“I think the report said that it gets burnt to ash, and the ash is then dumped at an island called Pulau Semakau.” Mike:“Aiyoh, what a lot of smoke and fumes that will pollute the atmosphere!” Andy:“No, I know that our incineration plants are very advanced and burn at very high temperatures and so there is very little smoke or poisonous gases released. It also results in very fine ash that takes up far less space than the original trash.” Joan:“High heat? Wah… must use a lot of energy, ah?” Mike:“Yah, not ‘green’, right? Is there any eco-friendly way?” Andy:“I heard of some way to recycle waste using, er… worms.” Joan:“YUCK!” Mike:“GROSS! So smelly!” Andy:“Yah, but you want eco-friendly, right?! Anyway, it’s just regular earthworms or something, and after that you get fertilizer.” Mike:“So how come we don’t use this method?” Learning Objectives Students will be able to: Design an experiment to show the effects of worms on the rate of decomposition of food waste Persuade peers on the advantages of sorting out trash Design a prototype table-top worm composting system InvestigationInvestigation Ideas Add worms to one bucket of food waste and label it “Experimental” Set up another similar bucket of food waste and label it “Control” Record daily observations of the compost bucket for 15 days Discuss the results Design a worm composting system Investigate optimal conditions for worm growth Examine the interaction of microbes in the worm composting system Design a pamphlet to encourage the public to sort their trash Resources Info on recycling in Singapore NEA Waste Management website Videos on vermicomposting Video of how-to do vermiculture Facebook game on waste management Waste Management Game Dumptown Game


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