Anaerobic and biogas desulfurization odor treatment
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This post was last edited by repurb on 2016-9-20 15:02. I. Anaerobic treatment: Even after absorption treatment (alkaline washing and biological treatment), an odor remains; it is suspected that the collection process before absorption was not properly sealed. I would like to ask if any of you experts have other solutions. II. Biogas desulfurization: After desulfurization, the return liquid tank (which is also used for biological treatment) emits an odor. Adding alkali improves the situation slightly, but it does not resolve the problem completely. I would like to ask professionals how this issue should be addressed. reward_7ree
First, you need to figure out what substance is causing this bad smell Generally, it is caused by hydrogen sulfide gas. Just remove the odor from this gas, and that’s it
Some trivalent iron ions can be added to the anaerobic tank. Hydrogen sulfide ions are removed using oxidation.
It shouldn’t be hydrogen sulfide gas. I was wondering, how is odor removal carried out in other anaerobic processes and biogas systems?
1. First, what is your odor like? Analysis: This is necessary to have prepared process references. And you only mentioned the bad smell; that’s not easy to deal with. 2. Using biogas for deodorization – through the strong oxidizing power of ozone and hydrogen peroxide (by designing a reactor), repeated treatment can eliminate the smell.
To determine the main gas components, what analytical instruments are needed? I asked around, and it seems it’s not that easy to do
1. The components of exhaust gas are mainly substances such as hydrogen sulfide and volatile acids; the efficiency of alkali absorption for hydrogen sulfide can reach 90%, but it is certainly not sufficient； It is difficult to determine whether the biological method is in a good active state, with its treatment efficiency fluctuating within the range of 20%-90%. An obvious unpleasant odor indicates that the treatment efficiency does not meet the standards. 2. In addition to ensuring proper sealing and efficient collection, it is recommended to implement oxidation measures; there are various available processes for this purpose, such as photolysis, ozone treatment, plasma technology, and multi-phase media methods. Since non-water-soluble substances account for a certain proportion of the exhaust gas components, it can be said that your process had certain flaws from the very beginning.
It feels really helpful! Do you mean the treatment of water-insoluble components by the defect you mentioned? Indeed, sometimes a yellow substance appears at the fan seals (tests show it is not elemental sulfur); this relates to substance analysis, and we lack the necessary analytical capabilities. Could you roughly explain the methods for dealing with this?