week6landfills - Landfills Where the garbage gets dumped...

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1 Landfills Where the garbage gets dumped Landfills • Throughout their history humans have created dumping grounds for their waste • In modern times landfilling has become a major issue because of the sheer volume and the composition of the waste we produce and must deal with somehow Types • There are a number of different types of landfill – Hazardous waste – Sanitary – Inert – dumps
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2 Types of Landfill Hazardous waste dumps are designed to deal with very specific types of hazardous materials like radioactive waste. • This will be covered under various industrial topics since each type of waste requires different measures to safely contain it. • These will be discussed as separate topics since they are often very specific to the type of waste they contain Inert waste dumps are for materials which are chemically and physically stable • These materials do not undergo decomposition or other changes, so they are essentially holes to fill with material like sand, gravel etc. Dumps are also holes, but with all types of waste thrown in. These are typically found in some rural or develop areas. These do pose environmental hazards Sanitary Landfills • These have a number of systems including liners and leachate systems to contain or collect any types of material which may otherwise be transported elsewhere • This is typically where MSW is disposed of
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3 Constructing a Landfill • A number of factors must be considered before a landfill is created Location - a location needs access (road access or rail) for the vehicles and machinery that will be transported, and must be reasonably close to the municipality that will use the site. Must also consider what the surrounding land is used for Physical Site • In creating a landfill, the surrounding environment must be considered Water table , drainage, rock structure (geology - which includes whether it is earthquake zone) • Type of disposal – Pit – into an artificially created underground site (like an abandoned mine – Natural opening – like a canyon, small valley etc. – Mounding – MSW is piled up on relatively open ground Capacity • What is the potential volume of waste that could be disposed at a location • This must also take into consideration the type of techniques used to compact the waste to avoid airspace (which is a waste of space) • This also includes a look at the lifespan of a landfill – how long it can be in use
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4 Site Remediation • What type of remediation will be needed to safely bury the site and return the land to a reasonable approximation of its original condition once it has reached its maximum capacity • Some sites can also have further related uses like landfill gas plants Elements of a Sanitary Landfill • The goal of a sanitary landfill is to minimize the effects on the surrounding
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week6landfills - Landfills Where the garbage gets dumped...

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