Te Vai Ora Maori: Non-chemical Water Treatment Methods.
Released by Te Vai Ora Maori, Nov 2019.
This info sheet was produced by Te Vai Ora Maori for the Koutu Nui Vaka Meetings, Sept-Oct 2019.
Language: Maori | English
Community group Te Vai Ora Maori has researched ways to ensure clean and safe drinking water without using chemicals. These methods require only minor changes to the new Te Mato Vai water treatment system. Non-chemical methods are culturally and environmentally appropriate, sustainable, and cost-effective.
Water quality is affected by breaks in network pipes or substandard plumbing. Household disinfection is the most reliable method of assuring the safety of drinking-water ‘at the tap’. A combined filtration and UV irradiation system is preferred by most residents and is used at village filling stations.
Anolyte solution is an alternative that can be used to sterilise storage tanks and network pipes prior to use. Anolyte achieves the same level of disinfection without the environmental impact of shock-chlorination.
If biofilm or sediment build-up slows water flow, then pipes can be cleaned using ice-slurry (ice-pigging).
Classification/subjects: Te Mato Vai, To Tatou Vai, chlorination, coagulation, biocoagulants, biofiltration, disinfection, drinking-water, commissioning, surface water, non-chemical water treatment, filtration, vetiver grass, moringa oleifera, Rarotonga, Cook Islands, South Pacific.
Te Mato Vai engineers David Sloan and Ross Dillon for technical detail on the new Te Mato Vai System. Evan Mayson and Tangi Taoro from the Project Management Unit for access to the Turangi Water Treatment Plant. Dr Ian Calhaem for information on anolyte and oice-piggin’. Maori translation by Julie Taripo Shedden and Tauraki Rongo. Info-graphic: Island Booth Information Design.
Published 7 Nov 2019. .