The Waikouaiti WTP was experiencing filter break through and other difficulties, so it was decided to upgrade to a 3,000 m3/day membrane filtration plant by way of a design/build contract.
Local river water is pumped to a 3000 m3 raw water reservoir, from where it is gravity fed through a 1 mm strainer to a flocculation tank, and then into the membrane tanks where a light vacuum is applied in order to produce permeate. This water is then pH corrected and disinfected with Cl2 before sending to reticulation.
Filtec faced tight constraints on the recovery rates even during times of high demand and fresh river conditions. To overcome this a lamella clarifier was installed to recycle wastewater back to the front of the plant allowing for a recovery rate greater than 96%.
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