Document Detail

Ammonia inhibition in the anaerobic treatment of fishery effluents.
MedLine Citation:
PMID:  11563375     Owner:  NLM     Status:  MEDLINE    
Inhibition of the organic matter consumption rate of a saline and rich proteic effluent by free ammonia was assessed in anaerobic filters at 37 degrees C. Inhibition of substrate (total organic carbon, TOC) consumption rate by ammonia was fitted by the Luong and noncompetitive models. Calculated kinetic parameters using the Luong model were maximum specific growth rate, micromax = 0.28 day(-1); average saturation constant, Ks = 568 mg TOC/L; Luong inhibition parameter, KNH3 = 1707mg ammonia-nitrogen (NH3-N)/L; and Luong exponent, gamma = 0.283 and the noncompetitive calculated parameters were umax= 0.26 day(-1), Ks = 703 mg TOC/L, and inhibition parameter, INH3 = 325 mg NH3-N/L. The Luong and noncompetitive models predicted 50% inhibition of the substrate consumption rate at ammonia concentrations of 147 and 325 mg NH3-N/L, respectively, suggesting biomass adaptation to the ammonia concentration (80 mg NH3-N/L as average) at which the anaerobic filters were previously operating. Ammonia formation by anaerobic digestion of fishing effluent would produce a maximum of 65.1 and 58.6% inhibition of the efficiency, predicted by the Luong and noncompetitive models, respectively. Ammonia influence on the digestion steps was determined by comparing fishing effluent with volatile fatty acids as substrates. The noncompetitive model predicted a 50% inhibition of methane production rate at ammonia concentrations of 196.6 and 188.6 mg NH3-N/L for fishing effluent and volatile fatty acids, respectively, suggesting that the methanogenic step is the one most affected by ammonia.
E Aspé; M A Jara; M Roeckel
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Water environment research : a research publication of the Water Environment Federation     Volume:  73     ISSN:  1061-4303     ISO Abbreviation:  Water Environ. Res.     Publication Date:    2001 Mar-Apr
Date Detail:
Created Date:  2001-09-20     Completed Date:  2001-10-25     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  9886167     Medline TA:  Water Environ Res     Country:  United States    
Other Details:
Languages:  eng     Pagination:  154-64     Citation Subset:  IM    
Department of Chemical Engineering, Universidad de Concepción Chile.
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MeSH Terms
Ammonia / metabolism*
Bacteria, Anaerobic / physiology*
Fatty Acids / metabolism
Models, Theoretical*
Organic Chemicals / metabolism
Oxygen Consumption
Refuse Disposal*
Reg. No./Substance:
0/Fatty Acids; 0/Organic Chemicals; 7664-41-7/Ammonia

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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