The OxyStream™ system combines slow speed surface aerators with an oxidation ditch design based on site-specific conditions and our proprietary hydraulic model.  The oxidation ditch has been proven effective in extended aeration applications throughout the world.  The extended aeration process provides buffer capacity against variable loading and a clear, predictable effluent.  The use of a surface aerator in an oxidation ditch optimizes both the oxygen transfer efficiency and the pumping capacity.

WesTech has adapted the OxyStream™ to meet different levels of effluent quality.  Due to the large volume of the oxidation ditch, nitrification can be expected at every installation.  The addition of anaerobic, pre-anoxic, and post-anoxic biological selectors creates a multiple stage process that can meet the most stringent nutrient limits.  WesTech has several installations achieving low total nitrogen and low total phosphorus limits.

WesTech has licensed the technology from Landustrie BV of the Netherlands. WesTech and Landustrie have designed and supplied the aeration equipment for numerous installations worldwide.  The impeller technology has continued to improve through testing and research in Europe and the USA.  WesTech has begun the production of the new LANDY-7 aerator in the United States.  When compared to earlier designs, the LANDY-7 aerator has improved oxygen transfer efficiency and mixing.

Advantages
• Predictable effluent
• Proven technology
• Power turndown ability
• Process guarantee
• Flexible operation
• No license fees