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2 comments:

  1. Aimee M., 7. August 2009, 12:26

    …….it sounds like ‘what goes round, comes round’……if the danger of toxicity from the seaweed ( to be collected for distribution in our food sourse,) is in the chemicals washed into their environment, then the chemicals are already distributed in the environment we are living in in the first place to get washed down to the seaweed beds. It’s a far bigger issue than stopping the collection of the seaweed “at the bottom of the cliff.”

     
  2. Celia Wade-Brown, 10. August 2009, 9:25

    Endocrine disrupting chemicals (EDCs) were addressed in the Moa Point Assessment of Environmental Effects (AEE) and in evidence presented at the Moa Point resource consent application hearing. EDCs are trace organic contaminants that have the potential to adversely affect aquatic fauna by mimicking hormones in a process termed “endocrine disruption”. EDCs can be expected in the influent to wastewater treatment plants. Investigations into removal of EDCs in wastewater treatment plants in NZ, Australia and internationally shows concentrations of most EDCs are greatly reduced by sewage treatment processes. Modern activated sludge plants such as at Moa Point and Seaview would typically remove 80-100% of most EDCs. Residual concentrations in treated wastewater are typically measured in “parts per trillion” and are often undetectable. Subsequent dilution in the receiving waters ensure that discharges from Moa Point and Seaview WWTPs present no significant risk to the aquatic ecology (or to human health).

    Wellington City, Hutt Cities and Porirua City Councils have modern wastewater treatment plants that discharge fully stabilized and disinfected effluents into the sea. The level of treatment given is as good as or if not better than most treatment plants discharging effluents to the sea. In terms of treatment there is little more that can be done apart from perhaps improving the actual location of the points of disharge.

    Because of the buffer capacity of marine waters there is no need for pH correction and in any event all the discharges have a near neutral pH value anyway

    Cr Celia Wade-Brown
    Wellington City Councillor
    Environment Portfolio Leader