Membrane separation technology that can be used for environmental protection in soda ash plants
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I went to a soda ash plant a few years ago and found that the smell of ammonia in the soda ash plant was extremely strong. As soon as I entered the workshop, I had a good meeting, which made me burst into tears. However, both company leaders and front-line employees * Take it for granted. That is also a loss of raw materials. It is said that there is a certain amount of ammonia consumption for producing one ton of soda ash, which is common knowledge in the industry. But where did the ammonia go? evaporated into the surrounding environment. After the promulgation of the new environmental protection law, is this still allowed? I'm considering membrane absorption technology. Place a membrane equipment with a special configuration at the source of ammonia volatilization or at the downdraft of the workshop. The membrane equipment will automatically absorb ammonia in the air, and then after a certain period of time (or if continuous operation is required for large processing volumes), the absorption liquid can be regenerated and reused. Its principle: The core is a microporous water-repellent hollow fiber membrane. The tube side of the membrane fiber is filled with (or flows through) a reversible absorption liquid that has a chemical absorption effect on ammonia. Theoretically, it can absorb almost no ammonia in the air. This absorbent is a buffer solution with an initial pH of 4.3 and a final pH of 6.5. The logarithmic value of ammonia's dissociation constant is 9.25 (that is, half of the ammonia in an aqueous solution with pH = 9.25 is free ammonia and the other half is ammonium ions), so ammonia must be approximately completely absorbed. Such a membrane equipment consists of tens of thousands of membrane filaments. The outer wall of the membrane filaments is in direct contact with the air. The specific surface area of such a membrane equipment is 3000-6000 square meters/cubic meter, so it is very efficient in absorbing ammonia in the air, even when there is weak air flow in the workshop. Using this membrane absorption technology, the by-product is ammonia water with a concentration of 10-18%, which is very pure and can be applied to the process. This kind of project has economic benefits and macro-environmental benefits, and at the same time it is equivalent to improving the micro-working environment of front-line employees. It can be said to kill three birds with one stone. According to a report on November 1 last year, 11% of PM2.5 in North China was ammonium salts, and 16% was * ao acid salt (partly derived from the oxidation of ammonia in air). This must be the contribution of our soda ash industry. This kind of pollutant cannot be absorbed by self-improvement, but must be controlled at the source. If you are interested, please contact the site.
It’s a very innovative trick, I hope it can be popularized!
Let’s try building one. I guess the little ammonia recovered won’t be enough to cover the running costs!
If you use traditional technology to solve this problem, it should be like this. However, the so-called "newness" of new technology should be reflected in its low operating cost and whether it is lower than the average level. All 29 tanneries in Xinji City, Hebei Province, which account for 60% of China's total leather production, were ordered to cease production a month ago. One of the reasons is that the 60,000 tons of wastewater ammonia nitrogen they discharge every day does not meet the standard. The cement, glass, chemical, and real estate industries are in recession. What good luck do you think awaits the ancient soda ash industry? Maybe a small problem of ammonia nitrogen pollution in the air will make you stop, or you can open a factory in Qinghai. i once said: Most of China's chemical factories make their profits from bad ethics. Each of our chemical workers should check whether a considerable part of your factory, including your salary, comes from this kind of "bad morality." Let me remind you again that 11% of PM2.5 in North China is ammonium salt and 16% is * ao acid salt.
Yes, you are right! The key requirement is to be on the same platform! Why do large state-owned enterprises have subsidies, but small private enterprises do not? And what I am talking about is that the use of membranes to treat ammonia-containing gases is not a new technology, but the industry is not willing to do it! Who wants to invest in something that is inversely proportional to income! The soda ash industry is currently in recession, and everyone is tapping their potential. If the large state-owned soda ash companies are not * * Help them hold on, they will collapse long ago! I have been to several large ammonia-alkali state-owned enterprises in China, and the annual subsidies exceed 100 million yuan! And do private companies have it? I also support the environmental protection you think of. When you see those large state-owned enterprises discharging ammonia-containing wastewater into the sea and desert, what is the first thing you think of!
* * Subsidize large-scale soda ash state-owned enterprises to discharge pollutants?
The topics we discussed were a bit too broad. “What is the first thing you think of when you see companies discharging ammonia-containing wastewater into the sea and deserts? ” The first thing I thought of was: After his death, he should have gone to the Nth level of hell. I helped him accumulate some virtue and do some good deeds, so that he could be promoted to the N-1st level.
You may not understand! I mean, a state-owned enterprise took on a project to treat liquid waste and residue, and the company asked * * They receive project fund subsidies, but how many of these companies’ so-called pollution control projects are running!
With the implementation of the new environmental protection law, environmental protection pressure is increasing, but this must be based on fairness. It is because of unfairness that the current new environmental protection equipment and facilities are in a rather embarrassing situation. But this embarrassing situation is expected to be alleviated soon.
Got it, thank you!