AWWA WQTC69450

Water supplies can blend multiple water resources to meet one or more goals. In practice, the blend ratio often reflects the available water resources rather than an integrated assessment of the resource, its quality and the application of the water. In the search for new resources, desalination is often mentioned as a viable option. Desalinating water can provide product water dramatically different from water of conventional treatment methods. This is especially true in water supply systems delivering water of high salinity and hardness. Copenhagen City, Denmark, (pop. 0.5 million) is currently supplied with relatively hard and saline water, with hardness and TDS levels around 370 mg (as CaCO₃)/l and 560 mg/l, respectively. This study describes possible consequences of diluting the water supplied to Copenhagen City with desalinated water. Includes 8 references, table, figure.