Napier City Council operates two Biological Trickling Filters (BTFs) to treat our wastewater at the Awatoto Wastewater Treatment Plant (WWTP). Alongside a spiritually cleansing Papatūānuku channel, these BTFs were constructed to address tangata whenua concerns about the quality of water being discharged to Hawke Bay.
A consent issued by Hawke’s Bay Regional Council allows Napier City Council to discharge treated wastewater into the ocean via a 1.8km pipe. The consent places strict monitoring and compliance requirements on us to minimise the environmental impacts of the City’s wastewater on the marine ecosystem. Under the consent, we are required to produce a performance report every three years to assess how well the BTFs are doing their job.
This report has been prepared by independent wastewater experts and assesses compliance with consent conditions over the last three years.
We would like your input on the triennial review of our wastewater treatment plant. We encourage you to read the draft report and share your views with us. The report and consultation is available here.
Overall, the treatment processes at our BTFs continue to perform well. Regular testing and monitoring suggests the environmental impact of the discharge into Hawke Bay remains low.
Key findings of the performance report:
Some of these results are not as good as they should be and we are committed to ensuring wastewater entering Hawke Bay is safe. We have a significant amount of investment in our water infrastructure over the next ten years and this will help improve our wastewater quality.
A short term initiative we have planned is the recommissioning of the Pandora Trade Waste Pipe. This will divert effluent from this industrial area and reduce the load on the BTFs at Awatoto resulting in a more efficient wastewater treatment.
We note the elevated levels of zinc and ammonia are potentially coming from the Pandora and Awatoto industrial areas. Council’s Environmental Solutions Team continue to work with businesses in these areas to ensure what enters the wastewater network from these sites is safe. Council monitors industrial users holding a trade waste consent on their discharge quality. Point source upgrades have been considered as a potential mitigation measure. We are also reviewing the trade waste bylaw that will provide us with more control over discharges into the wastewater network.
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