Is air pollution control an art or a science or a technology? Well it’s a bit of all three! The engineers might disagree, but let’s look at the basics.
Does size matter? Raises a lot of eye brows when you make such a comment! In air pollution control technology Size does matter!
How can you say that? Well it’s all about the characteristics of the particulate matter that we are trying to collect.
What is PM10? That’s what the Authorities are basing their regulations on. PM10 means all particles above 10 microns must be captured by a filtration system.
Let’s look at what 10 microns really looks like. For the smokers amongst us, a particle of smoke entering our lungs is 0.3 microns. Take a hair from your head (if you have one!) that is around 60 microns in diameter. So you can realise that particles of 10 microns are almost impossible to see with the naked eye. But when there are lots of them you really can see them.
The theory goes that all particles larger than 7 microns are captured in the nose (hairs), the rest go on through the lungs and are trapped in the lungs, with the potential of creating the nasty lung diseases. (Such as Cancer & emphysema)
So why does particle size matter? Ask yourself the question why are there so many different types of air pollution control devices on the market. Cyclones, Wet Scrubbers, Bag Filter, Cartridge Filters, Electrostatic Precipitators.
What’s the difference? Watch this space.
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