Current online water quality monitoring methods and their suitability ...

1. AIM OF THE REVIEWThe aim of this report is to review methods currently available for online monitoring of environmentalwater quality, with specific applications to wastewater, fresh water and purified recycled water(PRW). This report addresses: Water quality monitoring and sensing requirements for the PRW closed loop system; Current online water quality monitoring methods;Commercially available sensors and their suitability for the seven barrier approach; andCurrent developments in online water quality technology that may have potential applications inthe WCRW project to further strengthen the baseline water quality monitoring practices.2. OVERVIEW OF THE PRW SYSTEMThe Western Corridor Recycled Water (WCRW) Scheme is designed to supplement the traditionalSouth East Queensland (SEQ) freshwater supplies with purified recycled water (PRW). It isAustralia’s largest recycled water project and the Advanced Water Treatment Project is considered thethird largest project of its kind in the world. The WCRW project will deliver up to 232 ML/day ofPRW to power stations, industry, agriculture and the Wivenhoe Dam, which will be achieved using amulti-barrier treatment process to mitigate the hazards associated with water recycling. The closedloop PRW system will process raw wastewater from 6 sewer catchments through a seven-barriertreatment process to produce PRW to supplement existing freshwater resources at Wivenhoe Dam(Figure 1). The WCRW project will form part of the SEQ water grid (see Figure 2).Figure 1 Schematic diagram of the Seven-Barrier treatment process employed in the WCRW Project(source: Queensland Water Commission Fact Sheet 4 1 )Current Online Water Quality Monitoring Methods and Their Suitability for the Western CorridorPurified Recycled Water Scheme Page 4