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

 


Work on ponds upgrade going well

Work on ponds upgrade going well

Improvements to the oxidation ponds at the Christchurch Wastewater Treatment Plant are progressing steadily, with the first pond being brought back into service and the second one about to be emptied.

The first stage of the upgrade is nearing completion as Pond 1 is refilled following deepening and reshaping. The next stage is to take Pond 2 out of service to allow the construction of an earth baffle to effectively divide the pond into two cells. Operations and Maintenance Manager Mike Bourke says this will allow similar deepening and reshaping, and also strengthening of the pond banks to reduce the potential for failure in a major earthquake.

Other major works in the ponds involving new piped connections between some of the ponds is already well underway.

The upgrade of the ponds will change how the flow moves through the pond system and provide significant improvement to the wastewater quality before discharge. Currently the flow passes through three ponds in series before it is discharged to the estuary. When the pond upgrade is completed in mid 2004 the flow will pass through seven ponds in series, and produce an effluent quality that is expected to be some 10 times better than the current discharge in terms of pathogens present.

“This improved, natural disinfection is achieved by reducing the short circuiting of the flow from inlet to outlet of each pond and maximising the time the flow takes to pass through all the ponds. Computer modelling of the pond system, coupled with salt tracer testing, has been used to predict the improvements and to determine the optimum shape and depth,” says Mr Bourke.

The work in Pond 2 is expected to be completed around April next year. Mr Bourke says that some odour may be evident as the pond initially dries, and any dust potential in the summer will be minimised by restricting the contractors’ work area.

© Scoop Media

 
 
 
 
 
Parliament Headlines | Politics Headlines | Regional Headlines

 

Also, Loan Interest: Productivity Commission On Tertiary Education

Key recommendations include better quality control; making it easier for students to transfer between courses; abolishing University Entrance; enabling tertiary institutions to own and control their assets; making it easier for new providers to enter the system; and facilitating more and faster innovation by tertiary education providers... More>>

ALSO:

Higher Payments: Wellington Regional Council Becomes A Living Wage Employer

Councillor Sue Kedgley said she was delighted that the Wellington Regional Council unanimously adopted her motion to become a Living Wage employer, making it the first regional council in New Zealand to do so. More>>

ALSO:

Scoop Images:
Dame Patsy Reddy Sworn In As Governor-General

This morning Dame Patsy Reddy was sworn in as the New Zealand Realm’s 21st Governor-General. The ceremony began with a pōwhiri to welcome Dame Patsy and her husband Sir David Gascoigne to Parliament. More>>

ALSO:

Ruataniwha: DOC, Hawke's Bay Council Developer Take Supreme Court Appeal

The Department of Conservation and Hawke's Bay Regional Investment Company (HBRIC) are appealing to the Supreme Court over a conservation land swap which the Court of Appeal halted. More>>

ALSO:

With NZ's Marama Davidson: Women’s Flotilla Leaves Sicily – Heading For Gaza

Women representing 13 countries spanning five continents began their journey yesterday on Zaytouna-Oliva to the shores of Gaza, which has been under blockade since 2007. On board are a Nobel Peace Laureate, three parliamentarians, a decorated US diplomat, journalists, an Olympic athlete, and a physician. A list of the women with their background can be found here. More>>

Gordon Campbell: On The Key Style Of Crisis Management

At Monday’s post Cabinet press conference Key was in his finest wide- eyed “Problem? What problem?” mode. No, there wasn’t really a problem that top MPI officials had been at odds with each other over the meaning of the fisheries policy and how that policy should be pursued... More>>

ALSO:

Mt Roskill: Greens Will Not Stand In Likely Post-Goff By-Election

“The Green Party’s priority is changing the Government in 2017, and as part of that we’ve decided that we won’t stand a candidate in the probable Mt Roskill by-election... This decision shows the Memorandum of Understanding between Labour and the Green Party is working." More>>

ALSO:

Get More From Scoop

 

LATEST HEADLINES

 
 
 
 
 
 
 
 
 
Regional
Search Scoop  
 
 
Powered by Vodafone
NZ independent news