Sulphide is oxidised very ...
Published by Jeremy Biddle, Engineering Director at Bluewater Bio
Sulphide is oxidised very readily in aerobic conditions, so my first thought is to check the sampling and analysis. Was the sample stored for a while, especially in warm conditions, before analysis? If so, any biological activity in the sample would deplete the dissolved oxygen and then begin converting nitrate into nitrogen gas and, when the nitrate is all gone, sulphate into sulphide.
Check your clarifier. Is the sludge blanket too high (i.e. is sludge allowed to accumulate in the clarifier and go septic?) Do you have enough treatment/aeration capacity or is there a very high biodegradable organic load remaining in the clarifier influent?
1 Comment
I especially agree with Jeremy because usually MBBR process is highly aerated for biomass needs but also for mixing plastic media so you should not observe such H2S concentrations at the outlet except if you have high SRT in your clarifier => if it is the case, you should see bubbles at the surface (especially downstream the bridge move) and also black sludge on the surface of the clarifier due to anaerobic conditions at the bottom.
Published by Michael Martin, Deputy Asset & Technical DIrector at SUEZ International