Clogging of the alkali scrubber tower for hydrogen sulfide absorption
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To handle the escaping biogas (containing hydrogen sulfide), the anaerobic system was sealed to capture the gas; it first passed through an alkali scrubber (using sodium hydroxide solution) before entering a dry adsorption box. The alkali scrubber was installed later, as only dry adsorption systems were in use previously. About three months after installation, it was noticed that the plexiglass manhole cover was leaking. During inspection, it was found that the packing was covered with white substances that resembled crystals (could it be sodium sulfide?). These substances dissolved quickly when heated with hot water, and they also dissolved with lukewarm water, though it took a bit longer. Normally, the pH level is required to be above 9, usually between 10 and 11, with a maximum of 11. I would appreciate it if experts could analyze the reasons behind this and suggest ways to control and handle it in the future The image is as follows: The picture above shows the newly installed alkali scrubber, and the white color at the manhole can be seen. This diagram is a bit clearer. The substance that has been removed above is a white filler. This is a close-up; the filler is covered in white substance.
What is the hydrogen sulfide concentration in your project?
Since it has spilled out, the concentration is not high, generally below 150PPM.
I would like to ask what is a reasonable approach for dealing with a hydrogen sulfide concentration of 2000 ppm?
You can use alkali solution absorption just like the original poster
It wasn’t serious when it was discovered; it was found during a routine inspection. The pictures show it falling off after the flange cover was removed.
Dry method will work; it can achieve around 10PPM.
I’ve been spraying water on it; the dissolution is almost complete now, but operating it in the long term will be a hassle. I haven’t come up with a good solution yet.