What’s happened to acid rain?
If we don’t see it in the news, does that mean it has gone away?
Dear Control Engineering: How come we never read about acid rain in our newspapers anymore? Not even in Minnesota, land of 10,000 tree huggers. Tom D., retired control engineer.
As the graph from the U.S. EPA shows, acid rain reductions are a success story in that the amount has indeed declined for a number of reasons. Most relate to coal use, as sulfur content is the primary source. Here are a few specifics:
EPA regulations have worked in that they have driven utilities to install scrubbers and other remediation strategies. The Economist pointed out that 53% of coal-fired generating capacity now has scrubbers.
Utilities are closing older plants. For example, FirstEnergy just shut down a group of old coal burners in Ohio, and there are more on the hit list in other areas. That will raise the proportion of plants with scrubbers.
Coal-fired generation is declining overall. Ten years ago, coal-fired plants accounted for 52% of our electricity. Now that figure is 45%, and predictions suggest that downward trend will continue as natural gas and renewables grow.
As the Economist article notes, there are many more costs related to producing and burning coal than most people realize. There are technologies to mitigate the problems, but these are generally only installed at newer facilities. Getting over the problems will take time, but you may have more trees to hug.
Peter Welander, firstname.lastname@example.org
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After almost a decade of uncertainty, the confidence of plant floor managers is soaring. Even with a number of challenges and while implementing new technologies, there is a renewed sense of optimism among plant managers about their business and their future.
The respondents to the 2014 Plant Engineering Salary Survey come from throughout the U.S. and serve a variety of industries, but they are uniform in their optimism about manufacturing. This year’s survey found 79% consider manufacturing a secure career. That’s up from 75% in 2013 and significantly higher than the 63% figure when Plant Engineering first started asking that question a decade ago.