Problems with removing ammonia nitrogen using MVR
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An industrial wastewater has an ammonia nitrogen level as high as 10,000 mg/L, primarily in the form of NH4Cl. Can installing an MVR unit now to remove NH4Cl ensure that the ammonia nitrogen content in the steam condensate is less than 10 mg/L?
MVR is just a physical process; as long as ammonium chloride does not decompose, it will not be released
It shouldn’t be ammonium chloride in water; ammonia would evaporate, I guess. I suggest using ASPEN for simulation – I’m not very good at physical chemistry. If it’s the manufacturer, they could just conduct an experiment: lol
Ammonium chloride dissociates into ammonium ions in the presence of water, resulting in weak acidity; under acidic conditions, ammonia should not evaporate! You mentioned that the ammonia nitrogen content is very high, and it’s mainly ammonium chloride – are there any other components that can produce ammonia nitrogen? , because the level of water vaporized by you is only 10mg/L. So it’s best to have MVR conduct experiments on this; they probably also have pilot-scale machines, so just take them there and give it a try to find out! ! In fact, such experiments can be carried out by one’s own company as well!
NH4C will not evaporate. The rest of the ammonia can be pumped as non-condensable gas to the scrubber to have the ammonia removed
NH4Cl begins to decompose when heated to 100°C, so temperature control in the MVR system is very important. Steam condensate will certainly contain a high amount of NH3, and cation exchangers can be used to remove ammonia nitrogen from the steam condensate. I wonder if the project mentioned by the original poster is already under construction? Our company has extensive experience in MVR evaporation crystallization for saline wastewater; we can share our insights.
The condensate does not contain ammonium chloride; instead, it contains ammonia nitrogen (NH3-NH4+), and the concentration is less than 10 mg
Find an MVR manufacturer to discuss it with and conduct a test