Advanced solutions for VOC gas removal
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Some time ago, a company in Shanghai developed an exhaust gas treatment system for Shenma Group. The technology used involved UV catalysis combined with a biological filter bed. UV catalysis is easy to understand, as is the biological filter bed. The problem is that during UV catalysis, very high temperatures are generated, and measures must be taken to cool down the system; otherwise, cold air entering the UV area can cause the glass to expand and contract frequently, leading to cracks. Hot air entering the system can further increase the temperature, posing a risk of explosion. So how can cooling be achieved without affecting the efficiency of catalytic oxidation, while also protecting the lamp tubes and the reaction chamber? Do anyone have any good solutions? Let’s share our ideas and communicate more
This technology isn’t effective. UV catalytic oxidation works fine at first, but the formation of fouling on the surface of the quartz tubes reduces light transmission; after 2–3 months it becomes practically useless. In the end, it is still the biological filter that proves effective. However, biological filters are difficult to maintain, are highly affected by environmental factors such as temperature and humidity, require high energy consumption, and it’s hard to cultivate the necessary microorganisms. Therefore, both UV (or low-temperature plasma) catalysis combined with biological filters are only moderately useful. The hydroxyl radical deep oxidation technique is superior – it has strong oxidation capabilities, operates efficiently across the entire spectrum without selectivity, and does not cause secondary pollution. Feel free to share your thoughts and discuss this topic.
Hydroxyl deep oxidation technology? Do you mean radical oxidation? Hehe
This post was last edited by Xianshen on 2016-8-15 at 16:35. Regarding UV technology, the types in use in the market are generally those that operate at room temperature. The main considerations are the degradation period of the UV lamps, as well as the expiration date of the catalysts. I’m not sure what concentration the original poster is referring to, nor what the composition is; such technologies can only handle low-concentration waste gases. Biological methods are more suitable for cases where there are few types of organic substances present and they are of a single type, but again, only at low concentrations – otherwise, they are not very effective. I’m not very familiar with the other methods; please advise! Hydroxyl groups undergo deep oxidation; their presence lasts for a very short time, making them difficult to detect. The current results are rather modest. I wonder if there are any advanced technologies for deep oxidation?
Generally, waste gas treatment involves a combination of several methods, with the principle being to recover it first before treating it
The hydroxyl deep oxidation technique you mentioned refers to the Fenton method?
The short lifespan of hydroxyl radicals demonstrates their high oxidizing activity; they can undergo oxidation reactions upon encountering other molecules. The key is to figure out how to increase the production of hydroxyl radicals.