What does the Total Kjeldahl Nitrogen (TKN) test measure?

The Total Kjeldahl Nitrogen (TKN) test specifically measures the total concentration of organic nitrogen and ammonia nitrogen in a sample. This includes nitrogen that is part of organic compounds as well as free ammonia that can be present in wastewater and other water samples. The test is significant in wastewater treatment processes as it helps to assess the nitrogen content that could potentially contribute to ammonia toxicity or the nutrient loading in receiving waters.

Using the TKN values, operators can evaluate the performance of wastewater treatment plants and ensure compliance with regulatory standards regarding nitrogen discharge. Understanding TKN is crucial for effectively managing nitrogen in wastewater treatment systems, guiding the application of biological treatment processes, and developing nutrient management strategies.