LFG is extracted from landfills using a series of wells and a blower/flare (or vacuum) system. This system directs the collected gas to a central point where it can be processed and treated depending upon the ultimate use for the gas. From this point, the gas can be flared or beneficially used in an LFG energy project.
How are landfills monitored?
Instantaneous monitoring consists of walking over the surface of the landfill, while carrying a flame ionization detector (FID). Integrated consists of walking over the surface of the landfill, while pumping a sample into a bag.
What happens to landfill gas?
Landfill gases can move from a landfill through soil into outdoor air as well as the indoor air of nearby buildings. Landfill gases in outdoor air can enter a building through windows, doors, and ventilation systems.
How do you monitor landfill gas?
A common method of near surface gas monitoring is the use of a portable instrument such as a organic vapor analyzer-flame ionization detector (OVA/FID). Normally, the instrument is calibrated for methane but it can be calibrated for other gases commonly found in landfills.
What is landfill process?
A landfill is an engineered method for land disposal of solid and hazardous waste. Landfilling is the term used to describe the process by which solid waste is placed in the landfill. Landfills for individual waste constituents such as combustion ash, asbestos and other similar wastes are known as monofills.
How do landfills produce greenhouse gases?
When MSW is first deposited in a landfill, it undergoes an aerobic (with oxygen) decomposition stage when little methane is generated. Then, typically within less than 1 year, anaerobic conditions are established and methane-producing bacteria begin to decompose the waste and generate methane.
How does landfill gas energy work?
Ameresco works as an intermediary between landfills, nearby facilities, local utilities and local governments to develop landfill gas-to energy (LFGTE) projects that capture this gas for electricity and heat, turning a harmful source of waste into a beneficial source of renewable energy.
What can be produced from landfill waste?
How is landfill gas produced?
|Table 2-1: Typical Landfill Gas Components|
|Component||Percent by Volume|
What are the components of landfills?
There are four critical elements in a secure landfill: a bottom liner, a leachate collection system, a cover, and the natural hydrogeologic setting. The natural setting can be selected to minimize the possibility of wastes escaping to groundwater beneath a landfill. The three other elements must be engineered.
What are leachates in a landfill?
Leachate? “The liquid formed when rain water filters through wastes placed in a landfill. When this liquid comes in contact with buried wastes, it leaches, or draws out, chemicals or constituents from those wastes”.
What happens to waste in an incinerator?
Incineration of waste materials converts the waste into ash, flue gas and heat. The ash is mostly formed by the inorganic constituents of the waste and may take the form of solid lumps or particulates carried by the flue gas.