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

 


A Good Start For Napier’s Wastewater Treatment Upgrade


A Good Start For Napier’s Wastewater Treatment Upgrade

Ground improvements are nearly completed on the Awatoto site where Napier’s waste water treatment is undergoing a $30m upgrade.

The Waitangi Road site is being prepared for the construction of a biological trickling filter (BTF) plant. This is one of the biggest projects ever undertaken by the Napier City Council.

The base slab for the main effluent pump station has been poured below ground level. Passersby may have noticed small mountains of shingle formed to compress the site, including the area where the new BTF tanks will operate. This compaction process is further improving ground stability.

Council staff are working on tender documentation for the manufacture of plastic media and distributor arms for the BTF tanks – equipment that will be produced offshore.

A tender is expected to be awarded February to assemble the media into blocks for placing in the two tanks – a process expected to take several months.

Construction work building the BTF tanks and other site structures will get underway in mid-2013.

Caption: A massive boom pours concrete for the new pump station’s base slab. In the background is the existing milliscreening plant.

Backgrounder

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 BTF plant will incorporate 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 successfully 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 included 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.


Click for big version.

ENDS

© Scoop Media

 
 
 
 
 
Parliament Headlines | Politics Headlines | Regional Headlines

Gordon Campbell: A Govt. Christmas Bad News Dump -The Skycity Convention Center Blowout & A Negative MBIE Review

If the government really did have good tidings of great joy you can bet it wouldn’t be strewing them about at Christmas time – which is, traditionally, the dumping ground for terrible news that the government fervently hopes the public will be too distracted to notice. And so verily this Christmas Eve we learn of (a) the explosion of costs to the taxpayer and ratepayer of the vile SkyCity convention centre in Auckland and that (b) the government’s flagship MBIE “super-ministry” run by its Minister of Everything is a disaster zone of incompetence and mismanagement. MBIE is a Titanic looking for an iceberg, or so it would seem. More>>

 

Parliament Adjourns:

Greens: CAA Airport Door Report Conflicts With Brownlee’s Claims

The heavily redacted report into the incident shows conflicting versions of events as told by Gerry Brownlee and the Christchurch airport security staff. The report disputes Brownlee’s claim that he was allowed through, and states that he instead pushed his way through. More>>

ALSO:

TAIC: Final Report On Grounding Of MV Rena

Factors that directly contributed to the grounding included the crew:
- not following standard good practice for planning and executing the voyage
- not following standard good practice for navigation watchkeeping
- not following standard good practice when taking over control of the ship. More>>

ALSO:

Gordon Campbell:
On The Pakistan Schoolchildren Killings

The slaughter of the children in Pakistan is incomprehensibly awful. On the side, it has thrown a spotlight onto something that’s become a pop cultural meme. Fans of the Homeland TV series will be well aware of the collusion between sections of the Pakistan military/security establishment on one hand and sections of the Taliban of the other… More>>

ALSO:

Werewolf Satire:
The Politician’s Song

am a perfect picture of the modern politic-i-an:
I don’t precisely have a plan so much as an ambition;
‘Say what will sound most pleasant to the public’ is my main dictum:
And when in doubt attack someone who already is a victim More>>

ALSO:

Flight: Review Into Phillip Smith’s Escape Submitted To Government

The review follows an earlier operational review by the Department of Corrections and interim measures put in place by the Department shortly after prisoner Smith’s escape, and will inform the Government Inquiry currently underway. More>>

ALSO:

Intelligence: Inspector-General Accepts Apology For Leak Of Report

The Inspector-General of Intelligence and Security, Cheryl Gwyn, has accepted an unreserved apology from Hon Phil Goff MP for disclosing some of the contents of her recent Report into the Release of Information by the NZSIS in July and August 2011 to media prior to its publication. The Inspector-General will not take the matter any further. More>>

ALSO:

Drink: Alcohol Advertising Report Released

The report of the Ministerial Forum on Alcohol Advertising and Sponsorship has been released today, with Ministers noting that further work will be required on the feasibility and impact of the proposals. More>>

ALSO:

Other Report:

Leaked Cabinet Papers: Treasury Calls For Health Cuts

Leaked Cabinet papers that show that Government has been advised to cut the health budget by around $200 million is ringing alarm bells throughout the nursing and midwifery community. More>>

ALSO:

Get More From Scoop

 

LATEST HEADLINES

 
 
 
 
 
 
 
 
Regional
Search Scoop  
 
 
Powered by Vodafone
NZ independent news