Local Govt | National News Video | Parliament Headlines | Politics Headlines | Search

 


Start Made on Napier’s Wastewater Treatment Upgrade


Start Made on Napier’s Wastewater Treatment Upgrade

Ground works are underway for the $30m upgrade of Napier’s waste water treatment at Awatoto.

The Waitangi Road site is being prepared for building a biological trickling filter (BTF) plant, scheduled for commissioning at the end of next year.

Planning for the development – one of biggest projects undertaken by the Napier City Council – started in 2007. In granting it a 25-year consent, the Hawke’s Bay Regional Council requires the new plant to be commissioned by 31 December next year.

Over a 10-week period, Holcim Hastings Quarry are delivering 30,000 cubic metres of crushed rock quarried in Mere Road, Fernhill, onto the site. Another month will be needed to compact the structural fill in 250mm layers, bringing the site for the planned new pump station up to ground level.

The site was excavated in 2004 as part of ground improvements required for the previous planned expansion of the plant. The new development is being built at the same location, next to the existing milliscreen plant, so the earthworks previously carried out are being utilised.

The Napier City Council expects a start will be made on constructing the main effluent pump station, the first major component of the plant infrastructure, in autumn next year.

Meanwhile, the High Court has instructed the Environment Court to hear the matter of Wayne Church’s appeal on the outfall discharge resource consent being lodged within the statutory time frame.

Tandem Treatment for Wastewater

The existing milliscreen plant has been treating the city’s wastewater since 1991. The BTF plant will provide a secondary treatment process to follow milliscreening and a new grit removal process.

BTF is a fixed-film biological treatment process that is very well established, both in New Zealand and overseas. Compared to many other treatment processes, it is relatively economical and simple to operate. Wastewater flows through tanks with plastic filter media on which an active bacterial mass establishes to feed on and transform human waste into a non-offensive bacterial biomass.

The Napier BTF plan will use structured media, which is used in the Gisborne BTF plant and has also been trialled in the pilot plant at Napier. The two tanks containing the media will be covered to control odour, with air treated in a biofilter field of chipped bark.

The system’s only moving part is a sprinkler arm for distributing the wastewater. Other major advantages of the BTF process are that there will be no sludge transportation or disposal costs and it avoids the use of chemicals, which would eventually become part of the discharge.

As the final stage in the process, the treated wastewater will flow through a Papatuanuku channel (an open channel filled with rocks) as a spiritual cleansing before discharge via a 1.5km outfall into Hawke Bay, south of the city at Awatoto. Scientific studies show that the receiving environment is well able to accept such a discharge.

A pilot plant has already been successful trialled on the Awatoto site under local climatic conditions and using Napier sewage.

The design will allow for other treatment stages to be added in the future if needed.

Preparatory work undertaken at the milliscreen plant earlier this year includes the installation of a new upgraded electrical system, new draft tubes for outfall pumps, the relocation of the internal wash water tank to outside the building, an upgrade of the ventilation system and cleaning down and repairing internal surfaces affected by corrosion.

At all stages in progressing plans for the upgrade, the Council has consulted with the Kaitiaki Liaison Group.
ends

© Scoop Media

 
 
 
 
 
Parliament Headlines | Politics Headlines | Regional Headlines

Gordon Campbell:
On Anne Tolley’s
Callous Folly

Years ago, I remember someone in the Heath Ministry telling me off the record that regulatory oversight in this country largely consisted in ‘waiting for something to turn green or fall off somebody’ before the authorities would swing into action...

Last week’s conflict between Social Development Minister Anne Tolley and District Court judge Carolyn Henwood illustrated quite a few of the flaws in the system. More>>

 

Members’ Bills: Greens' Domestic Violence And Loans Bills Pulled From Ballot

Jan Logie’s Domestic Violence-Victims' Protection Bill introduces workplace protections for victims of domestic violence, including allowing victims to request paid domestic violence leave for up to 10 days... Gareth Hughes’ Bill allows Kiwis with student loans to defer their student loan repayments into a first home savings scheme. More>>

ALSO:

IPCA: Police Did Not 'Deliberately' Use Pepper Spray On 10-Year-Old

"When spraying the man, the officer did not properly consider the necessity of using pepper spray in a confined space, the likelihood that it would affect the other innocent passengers or the fact that he was using a more powerful spray." More>>

ALSO:

Donor Bill Passes: Full Income Compensation For Live Organ Donors

Unanimous cross-party support for the Compensation for Live Organ Donors Bill represents a critical step in reducing the burgeoning waiting list for kidney donations, according to Kidney Health New Zealand chief executive Max Reid. More>>

ALSO:

Earthquake Response: Emergency Legislation Prepared

Three new Bills have been drafted in the wake of the magnitude 7.8 earthquake on November 14 to ensure the government can enable affected communities to respond quickly and efficiently. More>>

ALSO:

Housing MPs: New Building(s) For Parliament

A new building will be erected on Parliament grounds to house Members of Parliament and their staff who currently work in leased accommodation in Bowen House. The plan has cross-Party support, apart from NZ First, said Parliament’s Speaker, Rt Hon David Carter. More>>

ALSO:

Get More From Scoop

 

LATEST HEADLINES

 
 
 
 
 
 
 
 
Regional
Search Scoop  
 
 
Powered by Vodafone
NZ independent news