Paeroa WTP - Chemical Free Waste Streams

Annual Conference

In 2012 Harrison Grierson was commissioned to design the upgrade of the Paeroa Water Treatment Plant (WTP), with the objective of increasing the plant’s capacity from 4.3 to 6.0 MLD and achieving compliance with the New Zealand Drinking Water Standards.

Constraints on the upgrade included the limited capacity of the existing sewer connection used to discharge washwater, and the heavily constrained site. The limited space made installing the equipment required to upscale the process design challenging, prohibiting installation of a clarifier, washwater handling and B-train access.

Given these constraints and the conditions of the raw water, the solution was developed around coagulant free membrane filtration, which only dosed coagulant during high color events. Reducing the volumes of coagulant used in the treatment removed the need for the B-train access and additional washwater handling. The upgrade of the plant also incorporated the first advanced oxidation UV peroxide plant commissioned in New Zealand, used to mitigate taste and odour.

This paper will discuss the design optimization process, consenting challenges for untreated washwater discharge and the collaboration of the structural and planning teams with the technology supplier required to develop this design solution.

Conference Papers

2.30 Paeroa WTP Chemical Free Waste Streams.pdf

pdf
903 KB
06 Nov 2017

2.30pm I Rabbitts.pdf

pdf
2 MB
06 Nov 2017