what will happen if we combined process of washing hydrogen sulfide from biogas and
denitrification on the WWTP line
How do you plan to wash hydrogen-sulfide from biogas? which method would you implement?
Let's not forget that the hydrogen sulfide H2S as well as the carbon dioxide CO2 in the biogas and the nitrates NO3- in the STP/WWTP are all ACID. Hence sufficient alkalinity would be needed to neutralize these. It is unlikely that the required alkalinity would be available in the sewage/wastewater after full nitrification (NH3+ > NO3-) which consumes a lot of alkalinity. Hence most likely caustic lye NaOH or lime would need to be added just for neutralisation of the wastewater.
However this does not remove/convert the H2S or NO3-.
The nitrates NO3- could in theory provide the chemical oxygen to oxidize the hydrogen sulfide H2S to sulfur S (partial oxidation) and/or to sulfate SO4-- (full oxidation). Unfortunately, the reaction rate is (very) low resulting in (very) large chemical oxidation reactors.
Instead of trying to chemically oxidizing H2S by NO3-, biological H2S oxidation would be more efficient and much faster as we apply successfully in our full scale biological biogas desulfurization units since many years (mainly in Asia).
You mean combinate the wastewater from FGD and SCR/SNCR units to WWTP? It is all right. But you should calculatethe inflow and water quality, and check the standards of the effluent.
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