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April 2008, Vol. 104, No. 4

In This Issue

COVER STORY

Successfully Scale Up Solids Handling

A sound theoretical model of the process to be scaled is the best approach; if one is not available, bench-scale testing, physical scale modeling or full-scale modeling is required.  Here are guidelines as to which method is appropriate for various solids-handling operations.

John W. Carson, Thomas G. Troxel and K. Eric Bengtson
NEWS

Legionella: An Invisible Risk

Ignoring this hidden hazard can put both the public and companies that operate cooling towers at risk.

Cynthia F. Mascone
NEWS

Grand Challenges for Engineering

Twentieth-century engineering enabled life as we know it. The National Academy of Engineering looks at what is needed in the future.

Gordon Ellis
ENVIRONMENTAL MANAGEMENT

Analyzing Equilibrium when Noncondensables Are Present

With the simplifying assumption that all of the noncondensable gases exit via the vapor stream, material balances and equilibrium calculations can be used to determine the compositions of the emissions streams leaving a control device.

Allen Hatfield