South Australia currently has at least four operating seawater desalination plants, with several more at various stages of the planning process. As of 2014, most proposed plants are intended to provide water for a variety of mining and industrial developments. Members of the Marine Life Society of South Australia have expressed concerns about the possible cumulative impacts of multiple desalination plants sited in Gulf systems, and potential for local impacts in the vicinity of brine discharges and seawater intake mechanisms. We believe a strong case exists for the establishment of a Statewide Desalination Plan, which carefully considers the suitability (or otherwise) of Gulf waters for desalination plants. We believe it should also carefully consider the possibility of environmental harm through brine discharges’ potential to increase localised salinity, cause brine pooling during dodge tides (regular periods of nominal tidal movement) and subsequently create deoxygenated zones.
|Adelaide Desalination Project||Domestic supply||Port Stanvac, Gulf St. Vincent||SA Water & AdelaideAqua||300||Operating|
|Penneshaw||Domestic supply||Kangaroo Head, Kangaroo Island||SA Water||0.3||Operating|
|Whyalla Steelworks||Industrial||Whyalla, Upper Spencer Gulf||Arrium Ltd||4||Operating|
|Marion Bay||Domestic supply||Marion Bay, Yorke Peninsula||Yorke Peninsula Council||0.06||Operating|
|Olympic Dam Expansion||Mining||Point Lowly, Upper Spencer Gulf||BHP Billiton||280||Approved 2011, construction deferred|
|Port Spencer||Mining||Lipson Cove, Lower Eyre Peninsula||Centrex Metals Ltd||14-55||Proposed 2012|
|Ceduna||Domestic supply||Ceduna, Great Australian Bight||F-Cubed||0.55*||Proposed 2012|
|Sundrop Farms||Seawater greenhouse||Port Augusta, Upper Spencer Gulf||Sundrop Farms||8**||Proposed 2014|
*The proposed Ceduna plant if constructed will not return brine to the sea. It will produce a variety of mineral salts as byproducts for other commercial applications.
**Sundrop Farms’ existing pilot seawater greenhouse does not discharge brine to Spencer Gulf. The proposed expansion (approved in 2014) will use a solar distillation desalination process, and will return 2.7 Gigalitres of brine at 60 parts per thousand salinity into the gulf via Alinta Northern Power Station channel.