Is there any reason of pH increasing in an anaerobic treatment system?
During the last stage of anaerobic digestion, methanogenesis gases such as methane, H2S, ammonia, etc. are produced. All of these gases are basic in nature and when they dissolve in the semi-degraded target leachate they convert to the same alkaline nature. Thus, the pH level can increase up to 10, depending on the number of gases produced during dark anaerobic fermentation.
On the other hand, if there is sufficient sulfate, some iron, and organic matter, sulfate-reducing bacteria will reduce the sulfate to pyrite (FeS2) and produce alkalinity, thereby raising pH.
Regards
Rathborey Chan Depends on the temperature and many other parameters but however I personally haven't come across increasing the pH after treating, only in case of acidification where the acids are increased due to I'm balance within the digester sometimes it may happen and if the temperature is not maintained and the system is disturbed sometimes again the C:N ratio is disturbed and the slurry gets acidified and hence the outlet slurry is acidic
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