Project Date: 31 December 2012
Project Status: Complete
Research Organisation: CH2MHILL
Project Number: 8TR4 - 006
Whilst water efficiency measures have many positive benefits, the reduction in water consumption can cause changes in sewage quality. Lower water consumption increases the concentration of both trade and domestic wastes. This also leads to lower sewage volumes which increases residence times in sewers potentially leading to septicity, blockages and corrosion of infrastructure. It is critical to understand the potential impacts of changing wastewater characteristics and system hydraulics if advanced water efficiency measures are to be implemented.
The purpose of this study was to better understand the practical limits the conventional sewerage system places on water efficiency investment.
Specific concerns identified included better understanding the hydraulic limitations of the sewerage system (at the Private, Reticulation, and Trunk levels) and the likelihood of impacts such as increases in blockages, sulphide corrosion, and odour events.
The data obtained as part of this study was recorded as part of sampling regimes that were not specifically designed to assess the impacts of water efficiency on the wastewater network. Additionally, cost impacts are also not recorded in a way conducive to establishing the financial impact of low flows in sewer networks. Therefore, although many findings point to increases in the likelihood of significant impacts on the sewerage system, it is difficult to directly assess the current situation in Melbourne accurately. However, a number of specific conclusions can be made:
For all Smart Water Fund Project enquiries please contact email@example.com
Subscribe to receive Clearwater e-News and alerts
(updates on the latest industry training and events, news and resources)