Fall-out dust monitoring is a legal requirement under National Environmental Management Act, 1998. The act refers to the fact that the gazette must be used to set the standards. [Section 9(1)]. The gazettes are published with subsequent gazettes providing amendments to the standards.
If the dust levels measured are above the specified limits then engineering solutions need to be implemented to decrease the fall-out dust levels.
There are many factors that affect fall-out dust namely:
Rainfall: because dust is attracted to the water vapour in the atmosphere and it then precipitates along with the rain.
Wind: because dust is carried by the wind and will only fall out when there is absolutely no wind.
Geographical features or any other factors that could influence the rainfall or the wind: for reasons mentioned above.
Pollens and small insects: because these add to the dust levels and precipitate out in the same way.
The most influential factors are “dusty activities”: such as dropping material from a conveyor onto a pile without considering the fall height. These and countless other activities are necessary for mining and other industries. The challenge, once dust problems are detected, is to engineer them away.
Generally, finer suspended dust (Greater than 0µm and less than 10µm) will remain airborne almost indefinitely due to the dynamic nature of the air currents and thermal activities on any given day, even if there is no wind at all. Particulate larger than this range will settle on a very still day and this material can be collected.
The unit that we use to capture this dust is the DustWatch, designed and patented in South Africa by Gerry Kuhn Environmental.
We offer the full-service package or parts of the package as the client requires. We will also assist in getting existing fall-out monitoring systems up and running again. Obviously, the full package allows the client to sit back and receive a report every month regarding their fall-out dust.
Contact us for more information on Fallout Dust.
Article regarding the practical problems caused by dust fallout.