Emergency treatment methods for wastewater containing ammonia nitrogen
Thread Content
Due to an ammonia leak in our company’s refrigeration system, a large amount of ammonia ended up in the chilled water, and emergency replacement measures were taken as a result, causing the ammonia nitrogen level in the wastewater system to exceed 600 mg/l. How to quickly reduce ammonia nitrogen to 35mg/l. I would like to ask everyone for advice.
It’s difficult to say without adding new equipment. May I ask what type of process your company uses for its wastewater treatment? It might be possible to make some improvements to increase the ammonia nitrogen removal rate, or to mix the wastewater with other wastewater streams that do not contain ammonia nitrogen in order to reduce its concentration
Adding oxidants such as chlorine is the fastest way for oxidation! ! !
Our company’s wastewater treatment is only preliminary processing – it involves adjusting the pH and allowing sedimentation before sending the water to the industrial park’s wastewater treatment plant.
Ion exchange resin can be considered for use. gfmin@sina.com
A ammonia vaporization tower is built, and ammonia is vaporized in that tower.
The preferred emergency treatment method is the magnesium ammonium phosphate precipitation method, as it requires simple equipment, is easy to operate, and involves low initial investment. The specific method involves adjusting the pH of the water to 10–10.5, then adding phosphate ions and magnesium ions; this causes ammonia to precipitate, and solid-liquid separation is used to reduce the ammonia nitrogen content in the water.
Are there any better methods for learning*?
This method is not suitable for emergency handling.
Please refer to the following treatment process and try using the existing facilities for chemical treatment: Based on the principles of the A/O process combined with the HSBEMBM® high-efficiency microbial treatment process, wastewater containing ammonia nitrogen first enters a regulation tank where homogenization, equalization, and pH adjustment are carried out; if necessary, phosphates are added to supply the nutrient P. After homogenization, the wastewater proceeds to an initial aeration tank, which is an aerobic aeration tank designed to remove toxic and harmful substances from the wastewater that could inhibit denitrifying bacteria. The water from the primary aeration tank flows naturally to the primary sedimentation tank for sludge-water separation, with the sludge being returned to the primary aeration tank. The water from the primary sedimentation tank is then pumped into the biochemical treatment section, where it enters the carbon and nitrogen removal units. Due to the high concentration of organic matter and NH3-N in the wastewater, high-efficiency microbial agents are added to the tank to carry out the denitrification processes of nitrification and denitrification, simultaneously achieving carbon removal as well. The treated wastewater passes through a secondary sedimentation tank to settle the sludge, which is then sent to a sludge collection tank. The water that has been treated to an acceptable standard is pressurized using a circulation pump and sent back to the workshop for reuse.
Alkali can be added to adjust the pH to 12 and maintain it at that level; air stripping can reduce ammonia nitrogen to around 50, and dilution can then bring it below 35 mg/L. This method is simple and requires no large investment.
The simplest way to deal with ammonia in chilled water pipes is to repair the leaks. As for rapidly reducing ammonia levels, if the leak is not fixed, any treatment method will be useless. Since we are dealing with the wastewater stage, air stripping should be a temporary emergency measure. I think for other chemical treatment methods, they may not be available in advance or may not be able to be purchased quickly.
Adjust pH — Oxidize with chlorine — Air stripping
The so-called emergency treatment facilities are not permanent treatment units; rather, they are designed for use in urgent situations. Therefore, physical methods such as stripping and ammonia vaporization are not suitable, nor are biological treatment units appropriate. Appropriate methods such as coagulation sedimentation and oxidative decomposition are feasible and can be put into use immediately.
As an emergency measure, acid can be added for neutralization to adjust the pH value.
The stripping method is a viable option
Soluble carbonate, then precipitation.
Let me share my opinion as well. In fact, the most crucial aspect of emergency handling is having storage facilities; only by being able to store the wastewater generated by accidents can we gain time to deal with it properly. The original poster might consider building such a tank in the future. As for the method of treatment, I still prefer converting it into ammonium salts and then using flocculation and sedimentation for treatment! ! !