title: Enhanced reduction of waste activated sludge at a low temperature by locally isolated strains Pseudomonas sp. VNT and Aeromonas sp. VNT.
abstract: Appropriate control of waste activated sludge (WAS) is required to solve the annual increment of WAS volume. The low bacterial activity at low temperatures poses a difficulty in reducing or utilizing WAS in cold weather regions and/or during the winter season. This study reveals a practical method to enhance sludge reduction at a low temperature using isolated strains of Pseudomonas and Aeromonas species. The effect of inoculating each strain into WAS was examined at different temperatures (4°C, 10°C, 12°C, 15°C, 20°C, and 30°C) and under an aerobic condition. Sludge reduction showed 2- to 8-fold improvement at the temperature range from 4°C to 15°C. Both strains are psychrophilic and can produce protease and lipase for sludge degradation even at low temperatures. Thus, biological WAS treatment at a psychrophilic temperature can be enhanced by inoculating these promising strains.
authors.affiliation: Department of Biological Functions Engineering, Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, 2-4 Hibikino, Wakamatsu-ku, Kitakyushu 808-0196, Japan.
authors.forename: Nazlina Haiza
authors.initials: NH
authors.lastname: Mohd Yasin
authors.affiliation: Escuela de Ingeniería Química, Universidad Industrial de Santander, A.A. 678, Bucaramanga, Colombia.
authors.forename: Viviana
authors.initials: V
authors.lastname: Sanchez-Torres
authors.affiliation: Department of Biological Functions Engineering, Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, 2-4 Hibikino, Wakamatsu-ku, Kitakyushu 808-0196, Japan; Research Center for Advanced Eco-fitting Technology, Kyushu Institute of Technology, 2-4 Hibikino, Wakamatsu-ku, Kitakyushu 808-0196, Japan. Electronic address: toshi.maeda@life.kyutech.ac.jp.
authors.forename: Toshinari
authors.initials: T
authors.lastname: Maeda
mesh_terms: D000333:Aeromonas / Q000254:growth & development / Q000302:isolation & purification* / Q000378:metabolism*; D001426:Bacterial Proteins / Q000032:analysis; D001673:Biodegradation, Environmental; D003080:Cold Temperature; D058645:Denaturing Gradient Gel Electrophoresis; D008049:Lipase / Q000378:metabolism; D009844:Oligosaccharides / Q000032:analysis; D010447:Peptide Hydrolases / Q000378:metabolism; D010802:Phylogeny; D011549:Pseudomonas / Q000254:growth & development / Q000302:isolation & purification* / Q000378:metabolism*; D012336:RNA, Ribosomal, 16S / Q000235:genetics; D012722:Sewage / Q000382:microbiology*; D012995:Solubility; D014866:Waste Products
chemical_list: D001426:Bacterial Proteins; D009844:Oligosaccharides; D012336:RNA, Ribosomal, 16S; D012722:Sewage; D014866:Waste Products; D008049:Lipase; D010447:Peptide Hydrolases
keywords: Aeromonas; Pseudomonas; Psychrophilic; Waste activated sludge (WAS)