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- Title
Removal by Snowfall of Emissions from a Coal-Fired Power Station: Observations and Modelling.
- Authors
Jylhä, Kirsti
- Abstract
A case study to determine wet deposition near a 250 MW coal-fired power station unit on the south coast of Finland was carried out during a wintertime precipitation event. In addition to intensive meteorological observations, the experimental part of the study included the collection of 28 deposition samples within 10 km of the power station and measurements of sulphur dioxide in the air at two places, one inside and the other outside the downwind sector. Model estimates of the wet deposition pattern were also made, assuming a Gaussian shape and a gradual rise for the plume and taking into account inclined fall trajectories of snowflakes through the plume. By comparing the model results with the chemical analysis outcomes, it was inferred that for sulphur emissions in wet snowfall within the first 10 km from the source, the precipitation scavenging coefficient was probably of the order of 10-6 s-1 or less. This implies that the percentage of emitted sulphur being scavenged in the study area was about 0.7% at most. Although the observed decreases of acidity from the mean pH-value of 4.1 occurred only in deposition samples on the leeward side of the power station, no significant effects of alkaline fly ash could be confirmed. On the other hand, the model estimates do suggest that the sulphur and particularly the hydrochloride emissions may have added to the acidity of snow at downwind distances of 1–5 km from the source, but chiefly in a narrow sector which remained between the collectors.
- Subjects
COAL-fired power plants; FOSSIL fuel power plants; ACID deposition; ACIDS; FLY ash; POLLUTANTS
- Publication
Water, Air & Soil Pollution, 2000, Vol 120, Issue 3-4, p397
- ISSN
0049-6979
- Publication type
Article
- DOI
10.1023/A:1005222803234