Role of Acinetobacter johnsonii S35 isolate in floc-formation in activated sludge process

2010 ◽  
Vol 150 ◽  
pp. 44-44 ◽  
Author(s):  
Kimchhayarasy. Phuong ◽  
Kazuo. Kakii ◽  
Toshiyuki. Nikata
Keyword(s):  
Activated Sludge ◽  
Activated Sludge Process ◽  
Acinetobacter Johnsonii

scholarly journals Coaggregation among Nonflocculating Bacteria Isolated from Activated Sludge

2003 ◽  
Vol 69 (10) ◽  
pp. 6056-6063 ◽  
Author(s):  
Anushree Malik ◽  
Masashi Sakamoto ◽  
Shohei Hanazaki ◽  
Masamitsu Osawa ◽  
Takanori Suzuki ◽  
...  
Keyword(s):  
16S Rrna ◽  
Activated Sludge ◽  
Aggregate Size ◽  
Spectrophotometric Assay ◽  
Full Length ◽  
16S Rrna Genes ◽  
Rrna Genes ◽  
Acinetobacter Junii ◽  
Acinetobacter Johnsonii

ABSTRACT Thirty-two strains of nonflocculating bacteria isolated from sewage-activated sludge were tested by a spectrophotometric assay for their ability to coaggregate with one other in two-membered systems. Among these strains, eight showed significant (74 to 99%) coaggregation with Acinetobacter johnsonii S35 while only four strains coaggregated, to a lesser extent (43 to 65%), with Acinetobacter junii S33. The extent and pattern of coaggregation as well as the aggregate size showed good correlation with cellular characteristics of the coaggregating partners. These strains were identified by sequencing of full-length 16S rRNA genes. A. johnsonii S35 could coaggregate with strains of several genera, such as Oligotropha carboxidovorans, Microbacterium esteraromaticum, and Xanthomonas spp. The role of Acinetobacter isolates as bridging organisms in multigeneric coaggregates is indicated. This investigation revealed the role of much-neglected nonflocculating bacteria in floc formation in activated sludge.

Role of Protozoa in the Activated Sludge Process

Nature ◽  
1942 ◽  
Vol 150 (3809) ◽  
pp. 525-525 ◽  
Author(s):  
S. C. PILLAI ◽  
V. SUBRAHMANYAN
Keyword(s):  
Activated Sludge ◽  
Activated Sludge Process

Role of Protozoa in the Activated Sludge Process

Nature ◽  
1942 ◽  
Vol 150 (3812) ◽  
pp. 607-607 ◽  
Author(s):  
S. H. JENKINS
Keyword(s):  
Activated Sludge ◽  
Activated Sludge Process

An Aut-Ecological Study of Acinetobacter in Activated Sludge

1985 ◽  
Vol 17 (11-12) ◽  
pp. 139-146 ◽  
Author(s):  
T. E. Cloete ◽  
P. L. Steyn ◽  
L. Buchan
Keyword(s):  
Electron Microscopy ◽  
Activated Sludge ◽  
Ecological Study ◽  
Fluorescent Antibody ◽  
Phosphate Removal ◽  
X Rays ◽  
Activated Sludge Process ◽  
Aeration Zone ◽  
Micro Analysis

Data are reported on the role of Acinetobacter in phosphate removal in activated sludge. The fluorescent antibody (FA) technique was applied in an autecological study of Acinetobacter in this habitat. Results indicated that Acinetobacter was present in numbers exceeding 106 organisms per cm3 throughout all zones of the activated sludge process, with higher numbers occurring in the aeration zone. It was also found that Acinetobacter numbers did not vary regardless of whether phosphate was removed or not. Combined electron microscopy and electron dispersive micro-analysis of X-rays (EDAX) furthermore indicated that bacteria from phosphate removing activated sludge plants contained phosphate granules, whereas those from non-removing plants or where removal had stopped, did not contain phosphate granules at all. Hence, it was concluded that no major population shifts of Acinetobacter occurred in activated sludge and that the process of phosphate accumulation is induced in Acinetobacter. However, Acinetobacter never occurred in numbers sufficiently large to account for phosphate removal to the extent sometimes observed in activated sludge.

Sign in / Sign up

Export Citation Format

Share Document