Question

explain the prosses of modern landfill sites​

Answer 1

Answer:

Landfills are not designed to break down waste, only to store it, according to the NSWMA. But garbage in a landfill does decompose, albeit slowly and in a sealed, oxygen-free environment.

Modern landfill systems collect methane in a layer of pipes placed above the solid waste layer.

In a sanitary landfill, waste is separated from the surrounding environment using a system of layers designed to allow waste to decompose safely. While decomposition can produce methane—a major contributor to climate change—most sanitary landfills collect this gas and use it to generate electricity, keeping it out of the atmosphere.

landfills operate by layering waste in a large hole.

• The bottom of a modern landfill is typically lined with compacted clay dense enough to prevent liquids from penetrating it. On top of the clay, landfill engineers install a liner made of high-density plastic for added protection.

• Some waste produces liquid as it decomposes. And as rain and snow filter through a landfill, it can carry other contaminants to the bottom. Perforated pipes are installed on top of the liner to collect these liquids—known as leachate—and funnel them to treatment facilities, either onsite or at wastewater treatment plants.
• Waste naturally produces methane as it decomposes and when methane is released into the atmosphere, it contributes to global warming. But methane is also the main component of natural gas. Modern landfills work to turn methane into power using gas extraction wells that pipe it to treatment areas and then to plants that will turn it into electricity or other forms of energy.
• In the main area of the landfill, trash is delivered and then compacted to take up less room. Every day, the new trash is covered with a layer of dirt which helps contain odors and deter pests.