Lecture 15 Landfill Gas and Leachate Formation

Front

What are the major hazards associated with a landfill?

Back

Leachate and landfill gas.

Front

What are the potential dangers of landfill gas?

Back

It can be toxic, lead to global warming, and cause explosions.

Front

List the factors that affect the production of leachate and landfill gas.

Back

Nature of waste, moisture content, pH, particle size and density, temperature.

Front

What is the minimum moisture percentage required for most microorganisms to grow in landfill waste?

Back

Approximately 12% by weight.

Front

How does particle size affect landfill gas production?

Back

It affects the density achieved upon compaction and the surface area for moisture absorption.

Front

What effect does temperature have on gas production in landfills?

Back

An increase in temperature tends to increase gas production.

Front

What is the composition of typical landfill gas?

Back

Methane, carbon dioxide, oxygen, nitrogen.

Front

What is the flammability range of methane in air?

Back

5 – 15% by volume.

Front

What are trace components in landfill gas?

Back

Mostly alkanes and alkenes, and their oxidation products such as aldehydes, alcohols, and esters.

Front

What factors affect gas migration in landfills?

Back

Environmental conditions, geophysical conditions, climatic conditions.