New or improved low-energy technologies that can effectively treat OSPW or highly saline depressurization water for return to the Athabasca River. The technology should be economical and require minimal energy and maintenance for long term operation. Passive or semi-passive treatment systems that detoxify OSPW have several advantages over active treatment systems like ozonation including lower net environment effect, lower costs and the ability to deploy during the active mining and reclamation phases of mine life.