Discussion
A solvent tank loses \( 0.6 \) per cent of its \( 40 \) tonne annual throughput by evaporation. The volatile organic compound emission is
Answer: C
Correct answer: 240 kg
Take the stated fraction of the throughput:
\[ 40\,000\ \mathrm{kg} \times 0.006 = 240\ \mathrm{kg\ per\ year} \]
The distractor \( 2400 \) treats 0.6 per cent as 6 per cent. This is a fugitive emission - it escapes by evaporation from the tank rather than through any stack - which is why it is estimated from a loss factor applied to throughput rather than measured. Vapour recovery and floating roofs are the usual controls.
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