- SITE
- Constellation Drive Busway, Constellation Bus Station, Northern Busway, Auckland, NZ New Zealand
- ENGINEERS
- Connell Wagner
- CONTRACTORS
- Works Infrastructure
Design
The Bus Rapid Transport (BRT) system consists of ‘park and ride’ carparking areas and bus stations joined by a new roading corridor linking the stations in a new public transport initiative by Transit New Zealand and North Shore City Council. Each stage was designed independently to fit in with individual station opening dates.
StormFilter was selected by Project Engineers Connell Wagner as the best option to treat the high vehicle loadings associated with the busway sites. With over 250 StormFilter vaults installed in New Zealand and 80,000+ cartridges worldwide, the technology has proven performance and maintenance life-cycle costing.
The Auckland Regional Council (ARC) consent required that the treatment system removed 75% of Total Suspended Solids (TSS). Because of the high traffic loading associated with the busway sites, the ARC also required a treatment technology that could remove dissolved metals (zinc, copper, and lead) as a well as particulates.
Designed to meet stringent regulatory requirements, the StormFilter targets the full range of pollutants in urban runoff. Total suspended solids (TSS), soluble heavy metals, oil and grease, and total nutrients are effectively removed using a variety of sustainable media.
Zeolite, Perlite and Granular activated carbon (ZPG) filter media was used in StormFilter cartridges at the Busway carpark and roadway sections. ZPG filter media was chosen because of its ability to adsorb dissolved heavy metals and PAH, which are likely to occur on the site because of the high traffic loading.
Maintenance
Due to the nature of the busway sites having public carparks, high vehicle loadings, busses and pedestrians, it was essential that maintenance requirements were kept to a minimum. The typical maintenance interval for load based StormFilter designs is 12 to 36 months, meaning StormFilter has lower on-going maintenance costs and longer cleaning frequencies than other proprietary filtration systems.