Treatment of ammonia-containing exhaust gases

Ammonia-containing exhaust fumes are extremely smelly; they need to be properly treated.

Ammonia dissolves easily in water, so absorbing it with a small amount of water is an effective method. If there is concern about the formation of new pollutants, the amount of water used for absorption should be controlled so as to create a dilute ammonia solution; this diluted ammonia solution is then sent back to the ammonia vaporization tower, thus creating a closed loop that prevents pollution. Of course, this approach requires slightly more ammonia vapor for vaporization, but since it is aimed at environmental protection, some minor cost is inevitable.

I’m not sure if there are any coal-fired boilers or similar facilities in your area; if so, it would be possible to remove sulfur dioxide from the smoke emitted by those boilers, thereby achieving the goal of using waste to treat other waste!

It’s supported; one can simply use water absorption to produce dilute ammonia solution. Industrial plants and other facilities need boilers and industrial furnaces, and this solution can be utilized there. . .

We are using a passive ammonia recovery system; it’s possible to do that. Expansive mechanism cooling is utilized with ammonia-free exhaust gases, and the ammonia in those gases is cooled and separated at temperatures ranging from -40 degrees to 75 degrees – it’s quite convenient

The idea for the 6th floor is good! Absorbing with dilute sulfuric acid is actually a variant of flue gas desulfurization. One method for flue gas desulfurization is to use ammonia water at a concentration of around 3% to absorb SO2 from the flue gas; the final product is sulfuric acid. Following this approach, you can sell the dilute ammonia solution directly to nearby power plants or companies that use the ammonia-based desulfurization method! Turning waste into treasure – why not do it?

Construct an absorption tower to use dilute sulfuric acid for absorption; the resulting sulfuric acid can be sold directly as a finished product.

Could someone on the 6th floor send some information regarding passive ammonia recovery devices? Thank you!

Construct a saturator to use dilute sulfuric acid for absorption; the resulting sulfuric acid an can be sold directly as a finished product.

Selling sulfuric acid? It’s not very feasible; at present, the quality of sulfuric acid produced by the ammonia-based method for SO2 recovery is questionable.:o

The specific situation is as follows: There is a solution with a concentration of 6% ammonia, at a flow rate of 5 tons per hour. This solution needs to be converted into one with an ammonia concentration of 15%. The ammonia content in the resulting wastewater must not exceed 50 ppm, while the ammonia content in the exhaust gases must not be more than 2.5 kg/h. There is now an ammonia vaporization tower; when the concentration at the bottom of the tower reaches 50 ppm, the top of the tower is filled with ammonia gas, which causes severe environmental pollution! ! With an increased water volume, the concentration of ammonia produced is only around 10%. So, we want to first ensure that the concentration at the bottom of the tower reaches 50 ppm, and that the product meets the 15% requirement; any excess ammonia is then absorbed using sulfuric acid. But I really can’t find any relevant information. Could someone who knows about devices for absorbing ammonia with sulfuric acid please give me a brief explanation? ! ! I’d like to thank you first! ! :o

I used to think that water could simply absorb ammonia, but the absorption of ammonia by water releases a large amount of heat! ! An increase in temperature is highly unfavorable for water to continue absorbing ammonia. The most problematic aspect is that if that last little amount of ammonia is still absorbed by water, it will cause the water volume to increase sharply! Of course, it’s possible to apply pressure as well, but the current device is a constant-pressure tower. It’s okay in winter; I guess the device won’t be able to operate by summer. Everyone is welcome to give suggestions! !

It can be absorbed using spent alkali solution or sodium chloride solution: handshake

The traditional method for treating high-ammonia-nitrogen wastewater in the monosodium glutamate industry involves adding sulfuric acid followed by concentration to produce ammonium sulfate; this approach does not make use of distillation for treatment. I have worked with monosodium glutamate wastewater before, and I have always wondered whether it would be possible to replace the use of sulfuric acid with magnesium phosphates. In that case, ammonium magnesium phosphate could be precipitated, and since it is a type of fertilizer, it could be sold, thereby reducing the investment needed for concentration equipment as well as the operating costs associated with the concentration process. He left later, and this experiment was never carried out. Could you consider this approach? However, this treatment method has one drawback: the waste liquid after precipitation may turn into another type of high-salt waste liquid, and it’s not clear what the concentration of ammonia nitrogen will be in that case ； If the increase is appropriate, this result may not necessarily occur; only through experimentation can the outcome be determined. But I infer that the results will be good, because the solubility of magnesium ammonium phosphate is very low. This post was last edited by dujinlong123456 on 2007-12-12 19:14.]

Stripping to remove ammonia is economical; there’s no better solution, and new waste is generated after absorption

It is recommended to use an air velocity of 1.5 m/s in the empty tower, a spraying concentration of 25 m3/m2 for the sulfuric acid solution, and an operating pH of 4; this approach is the safest for sulfuric acid absorption

Absorption with water, using a packed tower; the ammonia concentration can reach 20–28%, while the ammonia content in the exhaust gas is less than 0.05%.

Absorption using water is feasible; the absorption tower can be divided into two sections, and by controlling the absorption temperature in the upper section, it is possible to regulate the ammonia concentration in the gas exiting the tower； By controlling the concentration of ammonia in the liquid coming out of the tower, it is possible to produce commercial ammonia for sale ； Since the quantity is very small, using substances such as carbon dioxide and sulfuric acid for absorption will result in the formation of ammonium salts; and these ammonium salts need to go through processes like crystallization and drying to become a usable product, which requires significant investment with poor returns due to the extremely small volume

I wonder if your problem has been solved? If ammonia removal from exhaust gases is the only consideration, and given that the volume of gas is not large, it is best to use a small, high-efficiency hollow fiber membrane absorber. Our company can provide it. This is a situation where you have ensured that the ammonia concentration in the water exiting at the bottom of the tower is below 50 ppm. In another scenario, if the exhaust gas at the top of the tower meets the standards, I guarantee that the water output from the bottom of the tower will also meet the standards. The equipment is available; 5 tons of wastewater per hour, which is easy to handle. The by-product of this process is dilute ammonia water with an ammonia content of over 500 ppm, which can be returned to your tower. This process is very economical; it requires almost no electricity and no heat source. If you are interested, contact me: yjqin1@yahoo.com