Describe landfills in more than 100 words.
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Answer:
A landfill is a carefully designed structure built into or on top of the ground, in which trash is separated from the area around it.
Why are landfills important?
Landfills contain garbage and serve to prevent contamination between the waste and the surrounding environment, especially groundwater.
What happens to the trash in a landfill?
Landfills are not designed to break down trash, merely to bury it. That’s because they contain minimal amounts of oxygen and moisture, which prevents trash from breaking down rapidly. So landfills are carefully filled, monitored and maintained while they are active and for up to 30 years after they are closed.
What is the difference between a dump and a landfill?
A dump is an open hole in the ground where trash is buried and where animals often swarm. Dumps offer no environmental protection and are not regulated.
A landfill is a carefully designed and monitored structure that isolates trash from the surrounding environment (e.g., groundwater, air, rain). This isolation is accomplished with the use of a bottom liner and daily covering of soil.
PARTS OF A LANDFILL
The main components of any secured, permitted landfill are:
Bottom liner — The bottom liner separates and prevents the buried waste from coming in contact with underlying natural soils and groundwater. In Municipal Solid Waste landfills, the bottom liners are generally constructed using some type of durable, puncture-resistant synthetic plastic HDPE (High Density Polyethylene) ranging from 30 to 100 mils thick. The plastic liners may also be designed with a combination of compacted clay soils, along with synthetic plastic.
Cells (old and new) — This is the area in a landfill that has been constructed and approved for disposal of waste. These cells range in size (depending upon total tons of waste received each day at the landfill) from a few acres to as large as 20+ acres. Inside these larger cells are smaller cells known as the daily workface, or sometimes referred to as cells. This is where the waste coming into the landfill for disposal that day is prepared by placing the material in layers or lifts where the waste is then compacted and shredded by heavy landfill compaction machinery.
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Answer:
A landfill site, also known as a tip, dump, rubbish dump, garbage dump, or dumping ground, is a site for the disposal of waste materials. Landfill is the oldest and most common form of waste disposal, although the systematic burial of the waste with daily, intermediate and final covers only began in 1940s. In the past, refuse was simply left in piles or thrown into pits; in archeology this is known as a midden.