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Denmark's National Inventory Report 2005 - Submitted under the ...

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5.2.2 Methodological issues<br />

The emissions of Non-Methane Volatile Organic Carbon (NMVOC) from industrial use and production<br />

processes and household use in Denmark have been assessed. Until now <strong>the</strong> NMVOC inventory<br />

in Denmark has been based on questionnaires and interviews with different industries,<br />

regarding emissions from specific activities, such as lacquering, painting impregnation etc. However,<br />

this approach implies large uncertainties due to <strong>the</strong> diverse nature of many solvent-using<br />

processes. For example, it is inaccurate to use emission factors derived from one printworks in an<br />

analogue printworks, since <strong>the</strong> type and combination of inks may vary considerably. Fur<strong>the</strong>rmore<br />

<strong>the</strong> employment of abatement techniques will result in loss of validity of estimated emission factors.<br />

A new approach has been introduced, focusing on single chemicals instead of activities. This will<br />

lead to a clearer picture of <strong>the</strong> influence from each specific chemical, which will enable a more detailed<br />

differentiation on products and <strong>the</strong> influence of product use on emissions.<br />

The procedure is to quantify <strong>the</strong> use of <strong>the</strong> chemicals and estimate <strong>the</strong> fraction of <strong>the</strong> chemicals<br />

that is emitted as a consequence of use. Mass balances are simple and functional methods for calculating<br />

<strong>the</strong> use and emissions of chemicals<br />

XVH = SURGXFWLRQ<br />

+ LPSRUW H[SRUW GHVWUXFWLRQ<br />

GLVSRVDO KROG XS<br />

(Eq.1)<br />

HPLVVLRQ = XVH HPLVVLRQ<br />

IDFWRU<br />

(Eq.2)<br />

where “hold up” is <strong>the</strong> difference in <strong>the</strong> amount in stock in <strong>the</strong> beginning and at <strong>the</strong> end of <strong>the</strong><br />

year of inventory.<br />

A mass balance can be made for single substances or groups of substances, and <strong>the</strong> total amount of<br />

emitted chemical is obtained by summing up <strong>the</strong> individual contributions. It is important to perform<br />

an in-depth investigation in order to include all relevant emissions from <strong>the</strong> large amount of<br />

chemicals. The method for a single chemical approach is shown in Figure 5.2.<br />

air<br />

product<br />

Figure 5.2 Methodological flow in a chemical based emission inventory.<br />

The tasks in a chemical focused approach are<br />

1) Definition of chemicals to be included<br />

chemical<br />

product<br />

activity activity activity activity activity<br />

soil water waste etc......<br />

etc......<br />

activity<br />

135

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