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General: Bottom Ash

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    • CommentAuthorCWatters
    • CommentTimeOct 11th 2012
     
    What's the forums view on the use of bottom ash as hardcore? On the one hand you seem to have people claiming it's a sustainable resource that can be used as hardcore (eg for reinforcing farm tracks), on the other you have people saying there is enough heavy metal in the stuff to make it worth trying to extract it?
    •  
      CommentAuthorted
    • CommentTimeOct 11th 2012
     
    I guess it is going to depend on exactly what was burnt to produce the ash. Pulverised Fuel Ash (PFA) was always used for roadbases when I worked in civil engineering (40 years ago now) but I'm pretty sure this was derived from burning coal.
    •  
      CommentAuthorted
    • CommentTimeOct 11th 2012
     
    Oh, and there is nothing obviously 'sustainable' about using the waste product from burning a fossil fuel. Just another misuse of the 's' word.
    • CommentAuthorCWatters
    • CommentTimeOct 12th 2012
     
    One of the reasons I asked was because I'd heard this story was coming (although I didn't know any detail)..

    http://www.cambridge-news.co.uk/Huntingdon-St-Ives-St-Neots/Toxic-fears-lead-to-investigation-11102012.htm

    "A report alleging that Industrial Bottom Ash (IBA) containing harmful chemicals is being used to build tracks and bases for the Cotton Farm Wind Farm on the former Graveley airfield has been passed to Huntingdonshire District Council.....

    ...the report showed the material contained a high content of metals and sulphides which could leach into water supplies."
    • CommentAuthorRobinB
    • CommentTimeOct 13th 2012
     
    This rang a bell. Back in 2001 I was living in Newcastle and there was a big story about the toxicity of the fly ash the council had use on allotment paths.

    http://news.bbc.co.uk/1/hi/events/newsnight/1426196.stm

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