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Tertiary Effluent Polishing System

This submerged, attached-growth media technology from LET is able to establish a stabilized, predictive environment for effective tertiary treatment whether new or retrofit, in-pond or out-of-pond.

The LET Polishing Reactor™ (LPR) provides effective and affordable supplemental BOD removal and ammonia nitrogen (NH3-N) polishing at municipal and industrial wastewater treatment facilities. The LPR is a submerged, attached-growth media technology that can be included at the end of a custom-designed LET biological wastewater treatment process or added to an existing system as a tertiary treatment for Ammonia removal and BOD polishing. 

This proven wastewater treatment technology enables LET to deliver guaranteed results for new and existing plants, as the LPR consistently achieves year-round effluent limits as low as 10 mg/l BOD, 10 mg/l TSS and 1 mg/L NH3-N. With our Advanced Integrated Lagoon Treatment (AILT) approach, LET is able to integrate state-of-the-art products such as the LPR with over 30 years of proven experience to maximize treatment efficacy and meet each of our client’s unique treatment objectives.

Tertiary Effluent Polishing System

Reliable and Consistent Technology That Effectively Removes Ammonia and Polishes BOD

The LET™ Polishing Reactor (LPR) is an up-flow, attached-growth reactor that provides effective and affordable supplemental BOD removal and ammonia nitrogen (NH3-N) polishing municipal and industrial wastewater treatment facilities. Using well-proven attached-growth media technology, the LPR enhances the growth of nitrification bacteria that biologically oxidize ammonia in an aerobic environment.

The LPR can be used as a stand-alone package treatment system for low-loaded/small flow applications, or as an add-on to existing treatment processes. It has proven to be an economical and reliable solution for achieving stringent effluent limits. Whether added as a final polishing step for supplemental BOD removal, or for ammonia nitrogen (NH3-N) removal, the LPR is often the most cost-effective tertiary treatment process available.

Exceptional Performance at the Lowest Lifecycle Cost

Designed for simple operation, requiring virtually no operational interface, a small positive displacement blower is all that is needed to deliver aeration and mixing to the reactor. The aeration, mixing and fixed film attached growth media are components of the LPR process that enhance the growth of nitrification bacteria and oxidize ammonia within its aerobic environment to maximize ammonia removal and BOD polishing. With no internal moving parts and efficiently aerated fixed film-attached growth media, the energy cost to operate the LPR is minimal. The reactor can be economically sized to handle flows from 20,000 gpd to 2,000,000 gpd and the process allows for a wide range of influent BOD and ammonia loadings.

Using a small positive displacement blower to provide the aeration and mixing of the water and fixed film attached growth media, the LPR process enhances the growth of nitrification bacteria and oxidizes ammonia within its aerobic environment to maximize Ammonia removal and BOD polishing ensuring that our clients’ unique treatment objectives are met as cost-effectively and efficiently as possible.

Conclusion

LET is committed to continuously advancing wastewater treatment processes and technologies, including the LET Polishing Reactor™. We do this by continuously improving and expanding upon our treatment designs and service offerings. Our “Circle of Innovation” philosophy ensures that the needs of our clients are met efficiently, effectively and cost-consciously as we work together with our municipal and industrial clients, protecting water resources now and for future generations.

“Since installation, we have noticed excellent odor control, algae control and our effluent test levels are remarkable. To encourage the choice of Lemna Environmental Technologies products, we welcome anyone interested to tour our facilities and/or review our weekly test results.”

J.R., Iowa – LET Client

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