Lagoon Total Nitrogen Removal in Any Weather: NitrOx+D™

The NitrOx+D Process Helps Municipalities Meet New Lagoon Total Nitrogen Effluent Standards Within Existing Infrastructure

lagoon ammonia removal

Triplepoint’s NitrOx+D is a proven lagoon nitrogen removal system that can be installed at 2/3 the cost of existing options while preserving the lagoon’s ease of operation.

Triplepoint’s patent-pending NitrOx Process was specifically designed to work within your existing infrastructure to cost-effectively remove ammonia from your lagoon effluent. It is a proven, time-tested solution to remove lagoon ammonia that can be installed at 2/3 the cost of existing nitrification options, while also as low maintenance as a lagoon.

NitrOx+D adds a denitrification step after nitrification to ensure your lagoon meets effluent limits for ammonia (NH3-N), nitrate (NOx-N), and Total Inorganic Nitrogen (TIN). Like the NitrOx Process, it is low maintenance, cost-effective, and works in any weather.

The NitrOx Principle of Cold Weather Lagoon TN Removal

Total nitrogen removal through nitrification-denitrification will reliably occur with the proper conditions. The purpose of the NitrOx+D Process is to control and optimize each of these conditions, fostering an ideal habitat for nitrifying and denitrifying bacteria and super-concentrating them into a small, cost-effective, and highly efficient reactor.  In doing so, the NitrOx+D guarantees results by:

Maximizing Bacteria Concentration

An increase in nitrifiers and denitrifiers yields an increase in nitrogen reduction. Nitrifiers and denitrifiers grow on substrate or “media,” meaning that in order to increase the quantity of these bacteria, you need to increase the surface area they grow on. The NitrOx+D Reactors contain millions of small media, producing over 150 square feet of surface area per every cubic foot of volume. This provides for a dense concentration of bacteria and allows the NitrOx+D Process to be the most effective nitrogen treatment solution in the smallest footprint, even at low temperatures.

lagoon total nitrogen removal


Controlling Temperature

As the water cools, nitrifiers and denitrifiers consume nitrogen more slowly. In the coldest winter months, wastewater can be too cold for the nitrifiers to effectively consume nitrogen, so the NitrOx+D Reactors automatically regulate influent by gently heating the water to 39–42˚F with heat exchangers or geothermal heat. Because this temperature increase is minor and only required a few months per year, the NitrOx+D Reactors operate cost-effectively while promoting rapid nitrogen reduction.

Optimizing Mixing & Aerating

In the nitrification tanks, low maintenance coarse bubble diffusers release medium bubbles from a full-floor grid, transferring the oxygen nitrifiers need to complete their ammonia digestion. In the denitrification tank, a mixer keeps the denitrifiers in suspension along with the carbon they need for nitrate digestion. These mixing components are designed to evenly distribute high-energy mixing throughout the reactors, agitating the millions of media so the bacteria, the oxygen needed for nitrification or carbon source needed for denitrification, and the waste are continuously in contact, creating an ideal environment for rapid ammonia-nitrogen reduction. This same mixing also causes the media to collide with each other, the walls, and the media retention sieves, constantly self-cleaning so you don’t have to.

lagoon total nitrogen removal


The benefits of the new Triplepoint NitrOx+D Cold Weather Lagoon Nitrogen Removal System are:

  • Removes lagoon Total Inorganic Nitrogen to as low as 1 mg/L
  • Maintains treatment in water temperatures near freezing
  • Cost-effectively retrofits your existing lagoons (2/3 the cost of alternatives)
  • Low maintenance, simple operation
  • Robust design that will last as long as your lagoon

Download our NitrOx+D Process Literature.