Garbage: Understanding and Managing Waste (Class 6 Science)

What is Garbage? Biodegradable vs. Non-biodegradable

Garbage, or waste, is anything we throw away because we no longer need it. But not all garbage is the same! The most important way to understand garbage is to divide it into two main groups:

1. Biodegradable Waste: This is the type of waste that can rot and mix back into the soil naturally. Think of it as 'nature's food'. It comes from plants or animals. Tiny living things called microorganisms (like bacteria and fungi) eat this waste and break it down.
Examples: Vegetable and fruit peels, leftover food, eggshells, leaves, paper, and cardboard.

2. Non-biodegradable Waste: This is the trouble-maker! This type of waste does not rot or decay for a very, very long time—sometimes hundreds or even thousands of years. It just sits in the soil or water, causing pollution.
Examples: Plastic bags, plastic bottles, glass, metal cans, and styrofoam.

Step-by-Step Guide to Vermicomposting

1. Step 1: Prepare the Bin — Take a wooden box or a plastic bin. Make a few small holes at the bottom for drainage. Spread a 1-2 cm layer of sand at the bottom, followed by a layer of moist soil. You can also add some shredded newspaper or cardboard.
2. Step 2: Add the Kitchen Waste — Add your biodegradable kitchen waste like vegetable peels, fruit waste, tea leaves, and coffee grounds. Chop them into smaller pieces for faster composting. Do NOT add oily food, meat, milk products, or salty items as they can attract pests and harm the worms.
3. Step 3: Introduce the Redworms — Gently place special worms called Redworms into the bin. Redworms are perfect for this job because they eat the waste and their excretions make the compost very rich. They are often called 'farmer's friends' for this reason.
4. Step 4: Cover and Maintain — Cover the bin with a gunny bag or a sheet of grass. This keeps it dark and moist, which the worms like. Sprinkle water every few days to keep the soil moist but not soggy. Gently mix the top layers every week.
5. Step 5: Harvest the Compost — In about 3-4 weeks, you will see loose, soil-like material in the bin. This is your vermicompost! To harvest it, leave the bin in the sun for a short while. The worms will move to the bottom. You can then collect the compost from the top and use it for your plants.

The Golden Rule: Reduce, Reuse, and Recycle

• Reduce: This is the most important 'R'. It means creating less waste in the first place. For example, use a cloth bag for shopping instead of taking a new plastic bag every time. Buy products that have less packaging.
• Reuse: This means using items again for the same or a different purpose instead of throwing them away. For example, you can reuse glass jam jars to store pickles or spices, or use old clothes to make a duster.
• Recycle: This means turning waste materials into new products. Old newspapers, glass bottles, some plastics, and metal cans can be sent to a recycling factory to be made into new things. Giving these items to the 'kabadiwala' is a form of recycling.

Watch Out! A Key Tip for Your Exams

A very common mistake is confusing biodegradable and non-biodegradable items. Remember this simple trick: If it comes from a plant or animal and can rot, it's biodegradable (e.g., banana peel, paper, cotton cloth). If it is man-made from chemicals and doesn't rot, it's non-biodegradable (e.g., plastic toy, glass bottle). Also, never suggest burning plastic as a way to get rid of it. Burning plastic releases toxic fumes that are very harmful to our health and the environment. The correct method is to segregate and send it for recycling.

Practice Questions with Solutions

• Q: Sort the following items into two groups: Biodegradable and Non-biodegradable. Items: Plastic toy, rotten apple, glass bottle, newspaper, metal can, dried leaves. A: Step 1: Identify items that can rot and come from natural sources. Rotten apple, newspaper (made from wood pulp), and dried leaves are from plants. Step 2: Identify items that are man-made and do not rot. Plastic toy, glass bottle, and metal can are manufactured and persist in the environment. Final answer: Biodegradable: Rotten apple, newspaper, dried leaves. Non-biodegradable: Plastic toy, glass bottle, metal can.
• Q: What is vermicomposting and which organism is used for it? A: Step 1: Define vermicomposting. It is a special method of making compost. Step 2: Explain the process. In this method, biodegradable kitchen waste is converted into a very high-quality fertilizer known as vermicompost. Step 3: Name the key organism. This process uses a specific type of earthworm called Redworms to speed up the decomposition process. Final answer: Vermicomposting is the process of using worms, specifically Redworms, to decompose organic food waste and turn it into a nutrient-rich fertilizer.
• Q: Explain the 3Rs (Reduce, Reuse, Recycle) with one example for each. A: Step 1: Define 'Reduce' and give an example. Reduce means to use less and create less waste. For example, buying a refill pack for a pen instead of a whole new pen. Step 2: Define 'Reuse' and give an example. Reuse means to use things again. For example, using an old ice cream tub to store food in the fridge. Step 3: Define 'Recycle' and give an example. Recycle means to make a new item from an old one. For example, old newspapers are recycled to make new paper or cardboard. Final answer: Reduce is creating less waste (e.g., carrying a cloth bag). Reuse is using an item again (e.g., using a glass jar for storage). Recycle is making a new product from waste (e.g., melting old plastic bottles to make new chairs).
• Q: Why is it important to separate wet and dry garbage before disposal? A: Step 1: Define wet and dry garbage. Wet garbage is biodegradable waste like kitchen scraps. Dry garbage is non-biodegradable waste like plastic, metal, and glass. Step 2: Explain what happens when they are separated. Separating allows wet waste to be composted to make useful manure. It allows dry waste to be sent for recycling to make new products. Step 3: Explain what happens when they are mixed. If mixed, neither composting nor recycling can happen effectively. The mixture just ends up in a landfill, causing pollution. Final answer: Separating wet and dry garbage is important because it allows us to compost the wet waste and recycle the dry waste. This reduces the amount of garbage going to landfills and helps save our natural resources.

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