Ammonia and pH Inhibition in Anaerobic Treatment of Wastewaters, Part II: Model Development

Eldem, Nursen �z; Akgiray, �mer; Öztürk, İzzet; Soyer, Elif; Call?, Bar?s

doi:10.1081/lesa-200026303

Cited by 1 publication

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“…The suggested cause of the inhibition of methanogenesis when the medium pH increased was ammonia. [3,4] According to Wiegant and Zeeman [5] ammonia acts as an inhibitor of methane formation from CO 2 and H 2 , having a lower effect on methane formation from acetate but leads the inhibition of propionate breakdown acting as an inhibitor of the acetate-consuming methanogens. Sterling et al [6] found a decrease of hydrogen and methane production with an increase in the ammonia concentration, causing the total inhibition at 3 g/L.…”

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The impact of ammonia nitrogen concentration and zeolite addition on the specific methanogenic activity of granular and flocculent anaerobic sludges

Milán

Montalvo

Ilangovan

et al. 2010

Journal of Environmental Science and Health, Part A

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This work presents the effect of ammonia nitrogen concentration and zeolite addition on the specific methanogenic activity (SMA) of different anaerobic sludges with various physical structures (granular and flocculent), operating in batch conditions. Piggery, malting production and urban sludges derived from full-scale anaerobic reactors were tested in the experiment as the source of inoculum in batch digesters. It was found that piggery sludge was the most affected by the increase of ammonia nitrogen concentration while malting producing and municipal sludges were less affected. In general, the addition of zeolite at doses in the range of 0.01-0.1 g/g VSS reduced the inhibitory effect of N-NH(4)(+) for piggery sludge (P.S.). For this sludge, the propionic:acetic ratio increased when the concentration of N-NH(4)(+) increased, indicating that methanogenesis was affected. Finally, a study of the microbial population involved in this study for P.S. by using 16S rRNA based molecular techniques revealed a presence of microorganisms following the order: Methanococcaceae > Methanosarcina > Methanosaeta.

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