American Society of Civil Engineers


Effects of Ammonia on Anaerobic Digestion of Simple Organic Substrates


by Dennis M. Heinrichs, (Res. Asst., Envir. Engrg. Div., Dept. of Civ. Engrg., Univ. of Manitoba, Winnipeg, Manitoba, Canada R3T 2N2), Héctor M. Poggi-Varaldo, (Res. Assoc., Envir. Engrg. Div., Dept. of Civ. Engrg., Univ. of Manitoba, Winnipeg, Manitoba, Canada R3T 2N2), and Jan A. Oleszkiewicz, M.ASCE, (Prof., Envir. Engrg. Div., Dept. of Civ. Engrg., Univ. of Manitoba, Winnipeg, Manitoba, Canada R3T 2N2)

Journal of Environmental Engineering, Vol. 116, No. 4, July/August 1990, pp. 698-710, (doi:  http://dx.doi.org/10.1061/(ASCE)0733-9372(1990)116:4(698))

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Document type: Journal Paper
Abstract: The effects of ammonia on mesophilic digestion of acetate, propionate, acetate-propionate mixture, and lactate were studied in batch serum bottles. The un-ionized ammonia nitrogen (UAN) affected the acetate-utilizing microorganisms in the acclimated mixed cultures to a greater extent than propionate-utilizing bacteria or other trophic groups. The inhibitory effects were less severe in batch reactors supplemented with sulfate, pointing to an antagonistic action of the sulfate-reducing bacteria. Analysis of the inhibition pattern of methane/biogas production has shown that UAN displayed a moderate half-kill dose in the range of 10 millimole and demonstrated a high sensitivity exponent. The latter suggests potential for a sudden failure response of an anaerobic system subjected to an increasing ammonia concentration in the reactor.


ASCE Subject Headings:
Ammonia
Anaerobic treatment
Control
Gas
Methane
Salt
Toxicity
Waste digestion