Tokoroa Wastewater Treatment Plant Upgrade South Waikato District Council
Tokoroa Wastewater Treatment Plant Upgrade South Waikato District Council • Four Treatment Plants • Tirau Consent Approved Late 2020 • Putāruru Consent Approved Late 2020 • Arapuni Consent Expired 1 July 2020 • Tokoroa Consent Expired 31 Dec 2011 • Tokoroa and Arapuni Consent lodged in 2018 • Notified (likely), New NPS, and NES Tokoroa Wastewater Treatment Plant Existing • Digester, Consolidation, Mechanical Biosolids • Step Screen • 3 Clarifiers • 2 Trickling Filters • FAST 1st in NZ • Drum Filter • UV Disinfection • SWDC inherited the Arapuni Treatment plant from ECNZ in 1993 • Discharge to ground infiltration on west side of Waikato River • Imhoff tank was built in the 1930’s • Upgraded in 1982, sand beds added • Tirau Plant. • It was upgraded in 2005 • Was first membrane treatment in NZ Phasing of Upgrades CAPEX ($000) INCREASED OPEX Year Proposed Staging for Discussion with WRC 1 2019 Wetlands for Tirau $ 418 $ 572 $ 60,600 $ 82,800 2 2020 Sludge Upgrade at Tokoroa - Enabling works for TN and TP upgrades $ 4,469 $ 6,115 $ 183,200 $ 250,700 2 2020 Putāruru Sludge Upgrade (additional centrifuge at Tokoroa) $ 2,466 $ 3,375 $ 233,000 $ 318,800 2 2020 Wetlands for Putāruru $ 599 $ 820 $ 251,400 $ 343,900 3 2021 Wetlands for Tokoroa $ 1,117 $ 1,529 $ 280,000 $ 383,000 4 2022 Tokoroa - TP Upgrade $ 631,200 $ 863,600 8 2026 Putaruru TN Upgrade $ 5,421 $ 7,418 $ 906,100 $ 1,239,700 12 2030 Arapuni $ 1,225 $ 1,676 $ 916,100 $ 1,254,700 14 2032 Tokoroa - TN Upgrade $ 3,250 $ 4,447 $ 1,236,500 $ 1,693,200 22 2040 Putaruru TP Upgrade $ 164 $ 225 $ 1,320,100 $ 1,807,600 27 2045 Tirau TN and TP Upgrade $ 2,088 $ 2,857 $ 1,398,800 $ 1,929,000 35 2053 Consent Expiry $ 21,217 $ 29,034 $ 1,398,800 $ 1,929,000 Tokoroa Wastewater Treatment Plant Upgrades over the years Tokoroa Wastewater Treatment Plant • 1958 • Initially a primary Dortmund, followed by two low rate biological filters and a final Dortmund sedimentation tank.
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