Environmental chemistry wastex - chemistryatdulwich

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25 Νοε 2013 (πριν από 3 χρόνια και 10 μήνες)

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Method

Advantage

Disadvantage

Landfills:
Waste is
buried in the
ground


rotting material produces
methane gas which cold be
collected


filled ground can be reused


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gas


Pollution of ground water

Incineration:
burning of
waste


Waste could be used as fuel


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gases


Adds to greenhouse
effect as CO
2

produced


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慳 d楯硩n


Requires energy as this
need to be done at high
temperatures to destroy
most toxic substances

characteristics

short half
-
life, low activity and high volume (approx
90%)

sources

materials such as gloves, coats, paper, tools, towels,
syringes, injection needles which have become radioactive
because they have been exposed to radiation in activities
such as sterilizing equipment in hospitals, manufacture of
smoke detectors, irradiating of food, radiotherapy, …

storage/disposal

Different methods:


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incinerated

characteristics

releases some heat

sources

It typically comprises resins, chemical
sludges and reactor components, as well as
contaminated materials from reactor
decommissioning.

storage/disposal

waste is first sealed in concrete and then in
steel drums which are placed in concrete
casks in concrete trenches. When a trench is
completely filled it is covered with a
concrete slab, a layer of compacted clay and
a reinforced concrete intrusion shield and a
final layer of clay.

characteristics


long half
-
life, high activity and low volume


癥特⁨ot

sources


used nuclear fuels from nuclear reactors,


waste products from processing used fuel


nuclear weapons

storage/disposal

is vitrified (made into glass) which is sealed in steel
containers and then buried underground in granite
rock or in deep mines;

issues


may still leak into water table;


remains active for a very long time;


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