"The PMU (Project Management Unit) have yet to substantiate claims of safety with peer-reviewed, long-term studies of the impacts of disposing of aluminium sludge to agricultural soils (let alone in the tropics)."
response to GHD’s ad: ‘The real science behind PACl sludge’ (Cook Islands News,
False demand for PACl sludge seems to have been triggered by selective science and media comments from local personalities. However, the by product of the water treatment method is nutrient deficient, it is anti-fertiliser – it is not ‘salty potting mix’.
PMU (Project Management Unit) have yet to substantiate claims of safety with
peer-reviewed, long-term studies of the impacts of disposing of aluminium
sludge to agricultural soils (let alone in the tropics).
offshore experts have been solicited to offer opinion on a method of disposal
that is not practiced in New Zealand. As such, they are only able to provide
aside the increased cost to growers, managing the nutrient-deficiency of the
sludge by the addition of synthetic phosphorus and trace minerals needs to be
is the degradation of water bodies due to an excess of nutrient, often
resulting from synthetic fertiliser run-off. In Rarotonga surface contaminants
move rapidly from sloping fields, to waterways, and then to the lagoon.
flooding has now become almost routine. Encouraging the increased use of
synthetic fertiliser is irresponsible when our lagoon is already in crisis.
that the ponds are at capacity – and that To Tatou Vai staff are clocking extra
hours shunting sludge between intakes – the PMU are attempting to shut the
stable door when the cart has already bolted.
Mato Vai waste has not been managed. GHD are simply attempting to transfer the
burden of an insufficiently-localised treatment method to a naive and trusting