When using air oxidation and aeration for the stripping of hydrogen sulfide, is it necessary to take explosion prevention into consideration?
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When using air oxidation and aeration for the stripping of hydrogen sulfide, is it necessary to take explosion prevention into consideration?
Is hydrogen sulfide classified as a Class A gas? Is the toxicity considered extremely hazardous? According to what standards is it classified?
This is a basic question related to design; it can be verified. I’m quite interested in knowing what kind of process this is. It seems that the wastewater contains hydrogen sulfide, which needs to be removed through stripping, and the gas resulting from this stripping process also requires alkaline treatment before it can be discharged. If the process is such, the concentration of hydrogen sulfide should be very low, so explosion protection may not be necessary. However, the pseudo-experts who conduct on-site inspections don’t understand this but still claim to be experts; they might decide that explosion protection is needed as soon as hydrogen sulfide is detected
That’s right; hydrogen sulfide belongs to Category A, right? Extreme hazard; explosion protection is required
If I make the wastewater alkaline and use pure oxygen for aeration to oxidize it, then since hydrogen sulfide won’t be produced, will I not need explosion-proof measures?
Whether an explosion-proof design is necessary depends on how your safety assessment document is prepared; if hydrogen sulfide gas is mentioned in it, then an explosion-proof solution will be required. If you write that acidic wastewater is neutralized with alkali and then aerated with air, and no hydrogen sulfide is produced, then no one will mention explosion prevention, right?
There is little knowledge about hydrogen sulfide-containing wastewater; the paper mills nearby often cause hydrogen sulfide to emanate from the sewer manholes. It is not clear whether their wastewater is made alkaline. I have seen ammonia in wastewater being removed through aeration, and there are detection parameters for ammonia nitrogen and COD. If this wastewater doesn’t emit an unpleasant odor, is aeration necessary?
Aeration is used to oxidize the sulfides inside
It is best to follow explosion-proof design. Before the project was approved, it wasn’t designed to be explosion-proof; but after the construction was completed and inspected, new regulations required an explosion-proof design. Nothing is certain in these matters – it’s possible that an expert might say that an explosion-proof design is necessary.
I guess ammonia removal by aeration also needs to be designed in accordance with explosion-proof principles, right? ?
We don’t have any that are not at the ppm level