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The influence of ammonium and methods for removal during the anaerobic treatment of poultry manure
Author(s) -
Krylova Nailia I.,
Khabiboulline Roustem E.,
Naumova Rimma P.,
Nagel Mark A.
Publication year - 1997
Publication title -
journal of chemical technology and biotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.64
H-Index - 117
eISSN - 1097-4660
pISSN - 0268-2575
DOI - 10.1002/(sici)1097-4660(199709)70:1<99::aid-jctb684>3.0.co;2-c
Subject(s) - methanogenesis , biogas , chemistry , ammonium , methane , manure , fermentation , anaerobic digestion , ammonia , composition (language) , phosphorus , bacteria , nitrogen , food science , zoology , environmental chemistry , biochemistry , agronomy , biology , organic chemistry , ecology , linguistics , philosophy , genetics
The addition of exogenous NH 4 Cl to poultry manure and synthetic medium was used to study the effect of ammonia‐nitrogen on the activity and composition of a methanogenic consortium. Results indicated that the production of biogas and methane was not affected by the variation in NH 4 Cl concentration within the range 2–10 g dm −3 (0·5–2·6 g N‐NH 4 dm −3 ). At higher values of ammonium (10–30 g dm −3 or 2–8 g N‐NH 4 dm −3 ) a significant decline in both parameters (by 50–60% for biogas and 80–90% for methane) was observed. A significant decrease in the numbers of bacteria of all physiological groups (especially proteolytic and methanogenic) was observed when more than 30 g NH 4 Cl dm −3 (7·8 g N‐NH 4 dm −3 ) was added to the fermentation medium. The addition of 10% (w/v) of powdered phosphorite ore enhanced the production of biogas and methane at NH 4 Cl concentrations up to 30 g dm −3 , and also changed the composition of the methanogenic consortium. A partial recovery in the numbers of proteolytic and methanogenic bacteria coupled with the decrease in the density of sulphate‐reducers was observed. High concentrations (more than 50 g dm −3 ) of NH 4 Cl seemed to cause irreversible inhibition of methanogenesis which could not be eliminated by the addition of phosphorites. ©1997 SCI