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July 06, 2007

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Morgan

The fly ash produced by Tynes Bay is highly toxic due to the amount of heavy metals that are mixed in with the garbage. It would be a disaster to use it as fertiliser.

Disposal of the ash was a major bone of contention during the construction of the incinerator as it is difficult to predict how/if toxins will leach from those cement blocks at the airport and into Castle Harbour.

Denis Pitcher

Thanks Morgan, thats good to know.

That raises another question. If the ash is toxic, what are the emissions from the plant like? What exactly are we spewing into the air that we drink from?

Morgan

Well that is a good question. The Tynes Bay stacks were equipped with scrubbers to reduce emissions - but I don't believe any testing is done of the impact of actual emissions of either Tunes Bay or Belco in their surrounding neighborhoods.

Dennis

The engineering adage holds true. The solution to pollution is dilution.. The real problems arise when the leaching toxins polute Castle Harbour with its shallow waters and fairly low flow rates. The scrubbers use static electricity to remove the ash from the hot gas but do not , to the best of my knowledge, have any impact of toxic gases. The engineering calculations rely of prevailing wind direction & speed, smokestack height and allowable toxicity concentration standards. The question then becomes whether or not the standards that are allowable elsewhere are good enough for Bermuda or do we demand a higher level of care. In theory the gases are mostly simplied down to CO, CO2 and various other organics, the ash is the prime offender with the heavy metals which are both toxic and robust.

Morgan

But do the standards take into account the fact that Belco's stacks are within a quarter mile of BHS, Saltus, and Berkeley (and roughly the same altitude as Berkeley)?

Dennis

Its more likely that the standards would be surpassed due to additional sources of polutants. ie operating alone it may be fine but given the other sources in the area such as Belco, traffic, etc there may be compounding effects.
The standards as I am familar with them, simply give the allowable concentrations. It is up to the engineer designing the stack to take these other factors into consideration.

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Random musings on politics, finance and life on the 21 square mile string of islands often referred to as Bermuda, by Denis Pitcher.

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