Public Private Partnership (PPP) construction jobs will be worth more than £30 billion by 2012 - more than double their peak level in 2006 and 2007 - it has been estimated.

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Waste projects will be a particularly lucrative sector due to the government needing to meet EU carbon reduction targets, reports the trade publication Construction News.

Commenting on market analysis, Angus Melville, editor of Infrastructure Journal, added that other construction jobs would also benefit from PPP investment.

Mr Melville said that the principle of private sector involvement would not be lost with a change of government, despite Conservative calls to scrap private finance initiatives (PFI).

Last month, shadow chancellor George Osborne told the Observer that he wanted to see the end of PFIs due to their lack of transparency and hidden costs.

However Mr Melville predicted that "as the financing community builds in confidence and banks return to the market, announcing their ability to lend long-term once again, PPP activity should pick up".