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Novel filamentous spore‐forming iron bacteria causes bulking in activated sludge
Author(s) -
Emtiazi G.,
Habibi M.H.,
Setareh M.
Publication year - 1989
Publication title -
journal of applied bacteriology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.889
H-Index - 156
eISSN - 1365-2672
pISSN - 0021-8847
DOI - 10.1111/j.1365-2672.1989.tb04960.x
Subject(s) - segmented filamentous bacteria , activated sludge , bacteria , agar , spore , aeration , microbiology and biotechnology , sewage , settling , chemistry , sewage sludge , nutrient agar , food science , biology , sewage treatment , waste management , environmental engineering , ecology , environmental science , engineering , genetics
Several Gram‐positive iron bacteria were isolated from bulking sludge. They were filamentous and had false branching. They had sheaths with iron deposits and formed spores on modified sucrose casitone yeast extract agar. They did not grow on influsion agar for longer than 1 month but could withstand 80°C for 1 h on the same medium. Adding them to sewage before aeration increased the biochemical oxygen demand of waste water and caused poor settling properties of activated sludges. They were the predominant filamentous micro‐organisms in bulking activated sludges. At present, these strains cannot be assigned to recognized taxa of Bacillus spp. or sheathed iron bacteria.