Nelson North Wastewater Treatment Plant (WWTP)

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Project title
Nelson North Wastewater Treatment Plant (WWTP)

Client
Nelson City Council

Location
Nelson

Services
Ongoing operations and maintenance contract for a regional wastewater treatment plant

Project Budget
$650,000

Year
2008 – present, with sole contract responsibility from 2011

Nelmac operates and maintains the two treatment plants in the Nelson region, one of which is the Nelson North Wastewater Treatment Plant (NNWTP).

The NNWTP has primary screening, a primary clarifier, a trickling filter, one 26ha baffled oxidation pond, two 7ha planted wetlands, and sea outfall.

Nelmac manages the treatment plant to perform to resource consent conditions. We undertake routine maintenance of all plant and equipment including SCADA and we are responsible for all operations 24/7, including emergency response. Our team conducts routine maintenance, minor repairs, and project upgrades as necessary. Outside the facility, we also manage vegetation control, vermin or pest control, and general exterior building maintenance as well.

This treatment plant has had a problematic history with respect to odour complaints. Since Nelmac has taken on the full operational contract, we have managed the plant essentially odour free and well within consent requirements. (CONFIRM STILL ACCURATE AFTER RECENT ODOUR EVENTS)

Nelmac’s commitment to improve the operation and perception of this treatment plant by working closely with the Principal’s representatives, the public, and other affected parties to understand the situation was a major contributing factor to the reduction in odour events. 

Bell Island / Operation and Maintenance of the Nelson Regional Sewerage System (NRSS)

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Project title
Bell Island / Operation and Maintenance of the Nelson Regional Sewerage System (NRSS)

Client
Nelson Regional Sewerage Business Unit (NRSBU)

Location
Bell Island, Waimea Inlet

Services
Operation and Maintenance of the NRSS Wastewater Treatment Plant and Trunk Main Reticulation Network

Project Budget
$1,700,000 pa

Year
2013 - ongoing

Nelmac is responsible for routine, pro-active, and reactive maintenance of the Bell Island facility. Our team operates and maintains the primary, secondary and tertiary treatment processes, including clarification, aeration, DAF and oxidation ponds. We operate SCADA, ATAD, sludge digestion and bio solids production; we test and monitor for resource consent compliance; and we undertake emergency repairs and all maintenance work.

The contract’s resource consent conditions for odour control, effluent discharge and biosolids quality - the latter to meet USEPA Class A standards – and Nelmac has not breached any of these conditions due to contractor performance since taking over the contract. The same is true of the pump stations, where there are contractual requirements to prevent overflows. (CONFIRM STILL ACCURATE AFTER RECENT ODOUR EVENTS)

Nelmac’s team at Bell Island have over 70 years combined experience in managing, operating and maintaining wastewater treatment plants in the region. The team also hold relevant industry recognised qualifications in wastewater treatment plant operation at either Diploma or Certificate level.