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

TV3 Videos: Key's Flip-Flop Over Whale Oil Texts | Slater
Reaction: Greens | More
Dim-Post Link: The Very Odd Slightly Left Of Centre

Gordon Campbell: On Government Arrogance

Right now, National is ramming anti-terrorism measures through Parliament. This legislation will grant the SIS the power to carry out 48 hour bouts of surveillance on anyone without a warrant, and will bestow on government the power to unilaterally revoke anyone’s passports and thus deny them the freedom to travel.

Ludicrously, the public has been given exactly one day to make submissions on these major infringements of their civil liberties. Despite Finlayson’s misleading signals on RNZ that these are only stopgaps until next year’s full review of our security laws, the measures in question will not, in fact, expire until 2018.

Why the insane rush? Good question. More>>

 
 

Parliament Today:

Key Texts With Whale Oil Released: PM Can’t Be Trusted Over Dirty Politics Defence - Greens

John Key’s answers to questions about dirty politics can’t be trusted, after he was forced to admit that he had misled journalists and Parliament about contact with attack blogger Cameron Slater, said the Green Party today.. More>>

ALSO:

Temporary Release Crackdown Continues: Corrections Review Of Phillip Smith Case

“The review by Corrections’ Chief Custodial Officer reveals that the plan for Smith’s series of temporary releases was overly ambitious and misinformed. He’s a highly manipulative and deceptive person who although technically eligible, should not have been considered for temporary release." More>>

ALSO:

White Ribbon Day: Govt Resumes Sexual Violence Trial Proceedings Work

Justice Minister Amy Adams has asked the Law Commission to resume work on proposals for better supporting victims of sexual violence through the criminal process. The Law Commission will revisit its previous work on alternative pre-trial and trial processes to identify options for improving complainants’ experience in court. More>>

ALSO:

"New Faces, Wise Heads": Andrew Little Announces New Labour Line Up

Labour Leader Andrew Little today announced a bold new caucus line up which brings forward new talent and draws on the party’s depth of experience. More>>

ALSO:

Gordon Campbell: On Rick Ellis As Te Papa’s New CEO

The recent appointment of former TVNZ boss Rick Ellis to head Te Papa has copped a fair bit of criticism. Much of it has been inspired by the suspicion that Ellis has been hired to pursue the same purely commercial goals as he did at TVNZ, while similarly neglecting the serious cultural side of his mandate. More>>

Passport Cancellation, Surveillance: Draft 'Foreign Fighters Legislation' Released

The final draft of the Countering Terrorist Fighters Legislation Bill contains proposals previously announced by Mr Key in a major national security speech earlier this month. More>>

ALSO:

Related

Joint Statement: Establishment Of NZ-China Strategic Partnership

At the invitation of Governor-General Lt Gen The Rt Hon Sir Jerry Mateparae and Prime Minister The Rt Hon John Key of New Zealand, President Xi Jinping of the People’s Republic of China made a state visit to New Zealand from 19 to 21 November 2014... More>>

ALSO:

Get More From Scoop

 

LATEST HEADLINES

 
 
 
 
 
 
 
 
Regional
Search Scoop  
 
 
Powered by Vodafone
NZ independent news