The purpose of an ammonia water treatment plant is to take the ammonia, NH4, which is present in water as an impurity, out of the water. An ammonia water treatment plant in Italy, which is a customer of K-Patents, gets its water from underground and its ammonia level is about 400 ppm. The plant uses caustic (30%), active carbon and iron chloride, FeCI3, for treating the water.
The ammonia is stripped away during the treatment process. During the last phase of the treatment, the ammonia is absorbed in to sulfuric acid (of 50% in strength) in absorption towers. The resulting product is ammonium sulfate. The target concentration for the ammonium sulfate is 30.8%.
K-Patents refractometers are used at the plant. Refractometer signal is used to correct the ammonium sulfate value, in case it is not correct, by recycling the product and adjusting the absorption process.
the customer needed a device, which could monitor the ammonium sulfate value on-line and they could only use a device made of plastic parts. The K-Patents refractometer fit the bill in both cases and was successfully installed and has been in use ever since. There is great potential for refractometers in all types of water plants, where ammonia needs to be removed from the water.