What is Landfilling?

S4-SA4-0082

Grade Level:

Class 7

Space Technology, EVs, Climate Change, Biotechnology, HealthTech, Robotics, Chemistry, Physics

Definition

What is it?

Landfilling is a method of waste disposal where garbage is buried in the ground in specially designed areas. These areas, called landfills, are engineered to prevent harm to the environment and human health by containing the waste.

Simple Example

Quick Example

Imagine your family has a lot of old newspapers, plastic bottles, and food scraps after a big Diwali celebration. Instead of just throwing them anywhere, your city collects all this waste and takes it to a specific large, designated area. At this area, the waste is dumped, compacted, and then covered with soil daily, much like making layers in a cake, but with garbage.

Worked Example

Step-by-Step

Let's see how a small landfill might manage waste over a few days:

Step 1: On Monday, the city collects 100 kg of mixed waste from a neighbourhood.
---Step 2: This 100 kg of waste is brought to the landfill, spread out, and compacted to reduce its volume.
---Step 3: At the end of Monday, a layer of soil (say, 10 kg) is spread over the compacted waste to cover it.
---Step 4: On Tuesday, another 120 kg of waste arrives, is compacted, and then covered with another layer of soil (12 kg).
---Step 5: By the end of Tuesday, the total waste buried is 100 kg (Monday) + 120 kg (Tuesday) = 220 kg. The total soil used is 10 kg + 12 kg = 22 kg.
Answer: Over two days, 220 kg of waste is buried under 22 kg of soil in the landfill.

Why It Matters

Understanding landfilling helps us appreciate how our cities manage the huge amount of waste we produce daily. This knowledge is crucial for careers in environmental engineering, urban planning, and public health, helping design better waste management systems and protect our planet from pollution and climate change impacts.

Common Mistakes

MISTAKE: Thinking landfills are just open dumps where garbage is thrown carelessly. | CORRECTION: Landfills are highly engineered sites with liners, drainage systems, and daily soil covers to prevent pollution.

MISTAKE: Believing all waste in a landfill decomposes quickly and harmlessly. | CORRECTION: Many materials, especially plastics, take hundreds of years to decompose, and even organic waste produces harmful gases like methane.

MISTAKE: Assuming landfills are a permanent solution for waste. | CORRECTION: Landfills have limited space and pose long-term environmental risks, making waste reduction and recycling more sustainable solutions.

Practice Questions

Try It Yourself

QUESTION: What is the main purpose of covering waste in a landfill with soil daily? | ANSWER: To reduce odour, prevent pests, and control the spread of litter.

QUESTION: If a city generates 500 tonnes of waste per day and sends 60% of it to a landfill, how much waste goes to the landfill in a week? | ANSWER: 500 tonnes/day * 0.60 * 7 days = 300 tonnes/day * 7 days = 2100 tonnes per week.

QUESTION: A landfill has a total capacity of 10,000 cubic meters. If 500 cubic meters of compacted waste are added each month, how many months will it take to fill the landfill completely? | ANSWER: 10,000 cubic meters / 500 cubic meters/month = 20 months.

MCQ

Quick Quiz

Which of these is NOT a typical feature of a modern landfill?

A protective liner at the bottom

Daily covering of waste with soil

Open burning of waste to reduce volume

Systems to collect leachate (liquid waste)

The Correct Answer Is:

Modern landfills are designed to prevent pollution, so open burning of waste is strictly avoided as it releases harmful gases. Liners, soil covers, and leachate collection are all essential features.

Real World Connection

In the Real World

In India, cities like Delhi and Mumbai face huge challenges with waste management, often relying on large landfills like Ghazipur or Deonar. These sites are managed by municipal corporations, using heavy machinery like bulldozers to compact waste and specialized trucks to transport it, working to prevent environmental damage and improve public health for nearby communities.

Key Vocabulary

Key Terms

LANDFILL: A site for burying waste in layers, designed to prevent environmental harm | LEACHATE: Liquid that drains from a landfill, often containing dissolved harmful substances | COMPACTION: The process of pressing waste together to reduce its volume | METHANE: A potent greenhouse gas produced when organic waste decomposes in landfills | WASTE MANAGEMENT: The process of collecting, transporting, processing, and disposing of waste materials.

What's Next

What to Learn Next

Now that you understand landfilling, explore 'Waste Segregation and Recycling'. Learning about waste segregation will show you how we can reduce the amount of waste that goes to landfills and protect our environment even better!