July 1977

Document Type


Degree Name



Dept. of Environmental Technology


Oregon Graduate Center


The Gaussian model for a continuous point source is presented. This model was applied to a control strategy evaluation project for the Weyerhaeuser - Pine Bluff, Arkansas mill for the preliminary assessment of particulate emission control techniques. The results show that the slaker stack may be an exceptionally strong source of downwind particulates leading to substantial violations of the Arkansas ambient standard. However, there are indications that these results may be in error due to non-negligible settling velocities for the slaker stack particulates. Assuming that the concentration of particulates from the slaker stack is actually small, the results indicate that only the use of a wet scrubber on the recovery boiler stack at an emission rate of 22.8 g/sec is unacceptable. All other control techniques lead to acceptable off-plantsite particulate concentrations. This project was conducted under the assumption of a constant wind speed throughout the mixing layer. To evaluate the effects of an increase in wind speed with height, the Pine Bluff results were reevaluated assuming a power law wind speed profile with exponents ranging from 0.25 to 0.50. The results indicate that an increase in wind speed with height leads to lower concentrations at large downwind distances (x >= 2 km) than predicted under a constant wind speed assumption. This implies that the original Pine Bluff results are conservative.





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