Water Journal : Water Journal September 2012-1
water recycling refereed paper technical features 88 SEPTEMBER 2012 water performance under the Operating Licence is audited annually by an independent expert nominated by the Independent Pricing and Regulatory Tribunal (IPART). The framework for calculating recycled water pricing is determined by IPART. Under the Operating Licence, recycled water supplied by Hunter Water must be supplied according to the Australian Guidelines for Water Recycling (AGWR) or relevant guidelines specified by NOW, NSW Health and EPA. Initiatives on Recycled Water Quality Management and Improvement Hunter Water ratified its Recycled Water Policy in September 2007. The Policy supports and promotes the responsible use of recycled water and the application of a management approach that consistently meets the AGWR, as well as recycled water customer and regulatory requirements. Most of the existing recycled water schemes were designed prior to the establishment of the AGWR in 2006, and as such are currently managed under the Guidelines for Sewerage Systems: Use of Reclaimed Water (2000). Hunter Water has developed the Recycled Water Quality Management Plan (RWQMP) that provides a pathway for implementation of Phase 1 of the AGWR (2006). The RWQMP, accepted by NSW Health, was submitted in the 2008--09 IPART audit for which Hunter Water received full compliance with respect to the recycled water aspects of the Operating Licence. A key component of being compliant with the AGWR is the implementation of the risk-based management framework. As part of this implementation process, a five-year Recycled Water Quality Improvement Plan (RWQIP) has been developed, which builds on management strategies established in the RWQMP providing significant background to the improvement strategies outlined. In support of management strategies established in Hunter Water's RWQMP and RWQIP, Hunter Water develops annual Recycled Water Quality Monitoring Plans outlining Hunter Water's recycled water quality monitoring strategies and procedures for a financial year. These plans support their objectives through proactive monitoring and established controls as described below: • Baseline monitoring is used to establish typical concentration levels present in the sources of recycled water and receiving environments; • Validation monitoring is undertaken to determine whether relevant preventative measures are capable of adequately controlling recycled water quality and exposure levels within the bounds required to achieve health and environmental target criteria specified in the AGWR; • Operational monitoring is undertaken to assess the performance of preventative measures throughout the recycled water system. Hunter Water uses a Supervisory Control and Data Acquisition (SCADA) system to support its operators by continuous online monitoring of WWTP equipment performance and operations; • Verification monitoring is designed to assess the overall regulatory compliance of a recycled water system with the requirements of the RWQMP; Table 1. Summary of Hunter Water's recycled water schemes during 2011--12. Supplying WWTP Treatment Level Reuse Scheme Reuse Type Reuse for WWTP (ML/year) 2011--12 Branxton Membrane bioreactor Farmer Pasture irrigation 37.29 Branxton Golf Course Municipal irrigation Woodlots Non-food crop irrigation Cessnock Tertiary Cessnock Golf Course Municipal irrigation 40.86 Dora Creek Secondary Eraring Power Station Industrial process water 1073.40 Dungog Secondary with maturation pond detention Farmer Pasture irrigation 17.69 Edgeworth Secondary with UV disinfection Waratah Golf Course Municipal irrigation 354.16 Oceanic Coal Dust suppression and coal washing Farley^ Secondary with maturation pond detention Farmer Pasture irrigation 0 Karuah Secondary with UV disinfection Karuah Effluent Reuse Enterprise (ERE) Pasture irrigation 142.00 Kurri Kurri Tertiary (filtration and UV disinfection) Kurri Golf Course Municipal irrigation 139.41 Kurri TAFE Municipal and landscape irrigation Morpeth Secondary with UV disinfection Farmer Pasture irrigation 79.29 McColl Engineering (Trotting Track) Dust suppression and landscape irrigation East's Golf and Leisure Municipal irrigation Paxton** Membrane bioreactor Woodlots Non-food crop irrigation 0 Onsite Reuse WWTP process water 180.00 Indirect Reuse Agricultural irrigation 2600.00 TOTAL 4664.10 ^ Farley WWTP currently being upgraded, ** Paxton WWTP recently upgraded.
Water Journal November 2012-1
Water Journal August 2012