Typically IWS will be contacted by an Owner, Engineer, or Regulator looking for a cost effective solution to meet Total Nitrogen levels of 10 mg/l or less. IWS can work with the system engineer to integrate the IWS Upflow Filter into their design or provide a comprehensive solution, whichever is best for the stakeholders. A typical application has been the IWS Upflow Filter following an Advantex treatment system or a sand filter.

The regulatory community has embraced the IWS Upflow Filter based on its performance in the field, simplicity of operation, low O&M requirements, and ability to treat a diverse range of waste strength. The IWS Upflow Filter has been approved by every regulatory agency that has received a permit application.

The IWS Denitrification Upflow Filter can be installed at grade (shallow walled structure) or below grade (fiberglass tank), depending upon site requirements and layout. The choice in configuration provides the Owner with options for integrating the solution into their existing or future operations.

The cost of the IWS Denitrification Upflow Filter is a function of influent conditions including: biological loading (BOD, TSS, TN); water chemistry; hydraulic loading; discharge and site requirements; and other factors. The IWS Denitrification Upflow Filter has up to a 60% lower projected life-cycle-cost than other industry standard denitrification technologies. Some of the factors that give the IWS Denitrification Upflow Filter a cost advantage include:

• No chemical additives or consumables
• No independent control system
• No instrumentation
• Minimal energy requirements
• No maintenance costs
• No licensing fees

IWS will provide a site specific price quotation for your project based on the influent conditions listed above.

IWS has designed the Upflow Filter and the carbonaceous media to an expected life of 15 – 20 years prior to any drop in performance. Life of the media shall be dependent upon residual nitrate levels of the secondary treated effluent flowing into the de-nitrification system. Projected Nitrate influent to the de-nitrification system is projected to be in the 15 – 60 mg/l range. Effluent nitrate levels exceeding these concentrations may have an effect on the expected life of the media. Detectable N as Nitrate will be monitored as part of the OM program. Once residual nitrate reaches 80% of maximum design effluent limits then the media shall be replaced within the filter.