Abstract：
:To investigate the competition among acetate-utilizing microorganisms at different acetate levels, bioconversion processes of 50, 100, 150 and 200 mM acetate in the presence and absence of methanogenic inhibitor CH3F were monitored in thermophilic methanogenic system. The successive response of methane-producing community during the deteriorative and recovery phases caused by pH disturbance was analyzed. High acetate concentration (>50mM) inhibited the activity of acetoclastic methanogenesis (AM). The increasing pH (>7.5) enhanced this inhibition. The syntrophic acetate oxidizing (SAO) bacteria and hydrogenotrophic methanogens including Methanomicrobiales and Methanobacteirales were more tolerant to the stress from high acetate concentration and high pH. Resumption from alkali condition to normal pH stimulated the growth of acetate oxidizing syntrophs. The reaction rate of SAO-HM was lower than that of AM. These results point to the possibility to regenerate the deteriorated anaerobic digesters by addition of acclimatized inocula rich in acetate-oxidizing syntrophs.
journal_name
Bioresour Technoljournal_title
Bioresource technologyauthors
Hao L,Lü F,Li L,Wu Q,Shao L,He Pdoi
10.1016/j.biortech.2013.04.113subject
Has Abstractpub_date
2013-07-01 00:00:00pages
319-27eissn
0960-8524issn
1873-2976pii
S0960-8524(13)00737-2journal_volume
140pub_type
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