Using a strong alkaline solution and a gas-permeable membrane to measure the concentration of ammonium/ammonia/nitrite/nitrate in wastewater
Due to the growing problems with the conventional processes for treating wastewater, there has recently been a spur in the development and design of a low‑cost nitrogen sensor package that can measure and monitor nitrate and ammonium in septic systems. Conventional processes for wastewater treatments are either too expensive, too ineffective, or simply too time-consuming.
Therefore, there is a need for a method and apparatus that is cost‑effective and can improve the treatment of wastewater streams.
This method involves using acidic reactions and a gas-permeable membrane. First, the wastewater stream is mixed with a strong alkaline solution stream, and the ammonium cation within the wastewater is converted to ammonia. The ammonia is then delivered to one side of a gas‑diffusion cell while the other side consists of an acid solution stream. After the ammonia diffuses, it mixes with the acid stream. Then, the ammonium concentration is determined by flowing the acid stream through a conductivity detector; the concentration of ammonium is proportional to the conductivity decrease of the acid stream.
Then, simultaneously, the alkaline sample stream flowing out of the gas diffusion cell is pumped through a reduction column to reduce the nitrate/nitrite into ammonia. The same process is used to determine the concentration of ammonium is then applied to determine the concentration of nitrate/nitrite.
High accuracy and precision
High selectivity for nitrate/nitrite and ammonium. There is no interference from color, turbidity, and hydrate cations/anions
Wide response range
Fast and real‑time measurement
Continuous and automatic measurement
Long‑time continuous deployment and long lifetime
High stability and low maintenance
Simultaneous measurement of nitrate/nitrite and ammonium in a single sensor package
Can be used to measure nitrate/nitrite and ammonium/ammonia in:
Water treatment plants
Intellectual Property Summary:
Stage of Development:
Available for licensing.
Source: Hermann Hammer, https://pixabay.com/photos/sewage-plant-wastewater-2224933/, Pixabay License