Video | Agriculture | Confidence | Economy | Energy | Employment | Finance | Media | Property | RBNZ | Science | SOEs | Tax | Technology | Telecoms | Tourism | Transport | Search

 


Top environmental award for Kawakawa Bay wastewater system

Top environmental award for Kawakawa Bay wastewater system

Watercare’s Kawakawa Bay wastewater system has received one of three Environment and Sustainability Awards for large projects presented by IPENZ, Auckland Branch at the prestigious Arthur Mead Awards Function.

Named after long-serving Auckland City Waterworks Engineer, botanist, and outdoorsman Arthur Mead, who was responsible for the initial survey and design work on the Upper Nihotupu and Huia Dams, the awards are presented annually to the projects that best address sustainability, potential adverse environmental effects, waste management and community involvement.

Watercare Acting Chief Executive Raveen Jaduram said continuing to improve the company’s wastewater treatment services in order to enhance the health of Auckland’s harbours, estuaries and waterways remained one of Watercare’s main objectives and a key focus of the company’s capital investment plans. The Kawakawa Bay project also illustrated the close working relationships Watercare maintained with iwi, residents, and community groups across Auckland.

Designed by Australasian engineering consultancy Harrison Grierson, and constructed by Fulton Hogan, who also managed the network during its first year of operation, the Kawakawa Bay system was handed over to Watercare last year. The system enabled the removal of aging septic tanks that had over time polluted groundwater and local streams, leading to the Bay being declared unsafe for swimming in 2002. Its safe-for-swimming status was restored in November 2012.

Harrison Grierson Technical Director Colin Cranfield said the use of a vacuum system, which was a first for New Zealand, allowed shallow pipelines to be constructed quickly, minimising disturbance to the residents.

“The spread out nature of the development over four kilometres of coastline, the sandy soils, and the high water table, made a vacuum system the best option for the Bay,” he said.

In a vacuum collection system, wastewater from individual properties drains to a pit and is then drawn into the vacuum pipe network through the operation of a pneumatically controlled vacuum interface valve in the pit. Once in the network, wastewater moves along the pipeline to the vacuum pump station by the differential pressure that is created by the opening and closing of the vacuum valves throughout the pipe network. Wastewater is subsequently conveyed from the collection tank at the vacuum pump station to the treatment plant via positive displacement pumps and a pressure rising main.

The Kawakawa Bay treatment plant employs an advanced, four-stage treatment process similar to that used at Watercare’s larger Mangere and Rosedale facilities. Wastewater passes through alternating oxygen-rich and oxygen-depleted environments, enabling a range of different bacteria to break down organic contaminants.

Residual organic contaminants and nitrogen are removed in a biological membrane reactor; bacteria and viruses by ultrafiltration. The treated effluent then flows to storage lagoons from where it is used to spray irrigate forest behind the treatment plant, more than two kilometres from the foreshore.

ends

© Scoop Media

 
 
 
 
 
Business Headlines | Sci-Tech Headlines

 

100 Years After Einstein Prediction: Gravitational Waves Found

For the first time, scientists have observed ripples in the fabric of spacetime called gravitational waves, arriving at the earth from a cataclysmic event in the distant universe. This confirms a major prediction of Albert Einstein’s 1915 general theory of relativity and opens an unprecedented new window onto the cosmos. More>>

Farming: Alliance Plans To Start Docking Farmer Payments

Alliance Group, New Zealand's second-largest meat cooperative, plans to start withholding some stock payments to its farmers from next week to bolster its balance sheet and force suppliers to meet their share requirements. More>>

ALSO:

Gambling: SkyCity First Half Profit Rises 30%, Helped By High Rollers

SkyCity anticipates the Auckland business will benefit from government gaming concessions which were triggered on Nov. 11 in recognition of SkyCity’s $470 million Convention Centre development. Morrison said the concessions would allow the Auckland business to lift its activity during peak period, noting it had a record revenue week over the Christmas and New Year period. More>>

ALSO:

Money For Light: Kiwi Scientists Secure Preferential Access To Synchrotron

Science and Innovation Minister Steven Joyce today announced a three-year investment of $2.8 million in the Australian Synchrotron, the largest piece of scientific infrastructure in the Southern Hemisphere, to secure preferential access for Kiwi scientists. More>>

Telco Industry Report: Investment Hits $1.7 Bln A Year

Investment in the telecommunications sector is $1.7 billion a year, proportionately one of the highest levels in the OECD, according to a report released today on the status of the New Zealand sector. More>>

ALSO:

PGPs: New Programme Sets Sights On Strong Wool

A new collaboration between The New Zealand Merino Company (NZM) and the Ministry for Primary Industries (MPI), announced today, aims to deliver premiums for New Zealand's strong wool sector... More>>

ALSO:

Restrictions Lifted: No Further Tau Flies Found

The Ministry for Primary Industries (MPI) confirms that all restrictions on the movement of fruit and vegetables in Manurewa, Auckland, due to the Tau fly, have been lifted as of 2.26pm on Sunday 7 February. More>>

Crowdfinding: Awaroa Beach To Become Public Land If Appeal Succeeds

Conservation Minister Maggie Barry says a privately-owned beach will become part of the Abel Tasman National Park if an online crowdfunding campaign to buy it succeeds... More>>

ALSO:

Get More From Scoop

 
 
 
 
 
 
 
 
 
Business
Search Scoop  
 
 
Powered by Vodafone
NZ independent news