title: Involvement of Acinetobacter sp. in the floc-formation in activated sludge process.
abstract: The coaggregation behavior of Acinetobacter johnsonii S35 isolate with sewage bacteria was assessed by a spectrophotometric assay using different samples from a municipal wastewater treatment plant and a community plant. A. johnsonii S35 coaggregated well with other free bacteria and microflocs at the mixing ratios of 0.2:1-0.6:1 of A. johnsonii S35 and sewage samples. In addition, the size of coaggregates became larger (100 μm or more) under the same conditions. A. johnsonii S35 cells were highly adsorbed (adsorption=93-99%) onto sludge samples. Microbial adhesion to hydrocarbon (MATH) test and adsorption to octyl-Sepharose CL-4B showed that A. johnsonii S35 cells and sludge samples had a hydrophobic character. The population of Acinetobacter spp. in sewage treatment plants was 2-7% and its role in bioflocculation was discussed. The present study revealed that A. johnsonii S35 isolate can play as a bridging organism and contribute in floc-formation in activated sludge process.
authors: Department of Material Science and Engineering, Graduate School of Engineering, Utsunomiya University, 7-1-2 Yoto, Utsunomiya 321-8585, Japan. ahsrors@gmail.com
authors: Kimchhayarasy
authors: K
authors: Phuong
authors: Shohei
authors: S
authors: Hanazaki
authors: Kazuo
authors: K
authors: Kakii
authors: Toshiyuki
authors: T
authors: Nikata
mesh_terms: D000150:Acinetobacter / Q000166:cytology / Q000302:isolation & purification / Q000378:metabolism* / Q000648:ultrastructure; D000327:Adsorption; D001673:Biodegradation, Environmental; D002947:Cities; D005427:Flocculation; D057927:Hydrophobic and Hydrophilic Interactions; D017404:In Situ Hybridization, Fluorescence; D007564:Japan; D008858:Microscopy, Phase-Contrast; D012722:Sewage / Q000382:microbiology*; D013997:Time Factors; D018508:Water Purification
chemical_list: D012722:Sewage