title: Aerobic granulation in a modified oxidation ditch with an adjustable volume intraclarifier.
abstract: A modified oxidation ditch (MOD) with an adjustable volume intraclarifier was proposed and used to achieve aerobic sludge granulation in continuous flow process. This MOD with working volume of 60L treated onsite wastewater from a town. Excellent aerobic granules with mean diameter of 600μm and sludge volume index (SVI) of 44mL/g were obtained in 120day. Bacterial community analysis revealed that most species from seed sludge were preserved in both MOD and granule SBR (G-SBR) except bacteria (Bacteroidetes) might be easily washed out during granulation. Some different bacterial communities were found in sludges from sequencing batch and continuous flow reactors. Presence of metal ions and inorganics in raw wastewater had positive effect on granule formation, but an adjustable volume intraclarifier for controlling selection pressure and deleting return sludge pump played a key role in aerobic sludge granulation.
authors.affiliation: College of Civil Engineering and Architecture, Zhejiang University of Technology, Hangzhou 310014, Zhejiang, PR China. Electronic address: tanweilijun@zjut.edu.cn.
authors.forename: Jun
authors.initials: J
authors.lastname: Li
authors.affiliation: College of Civil Engineering and Architecture, Zhejiang University of Technology, Hangzhou 310014, Zhejiang, PR China.
authors.forename: Ang
authors.initials: A
authors.lastname: Cai
authors.affiliation: College of Civil Engineering and Architecture, Zhejiang University of Technology, Hangzhou 310014, Zhejiang, PR China.
authors.forename: Miao
authors.initials: M
authors.lastname: Wang
authors.affiliation: College of Civil Engineering and Architecture, Zhejiang University of Technology, Hangzhou 310014, Zhejiang, PR China.
authors.forename: Libin
authors.initials: L
authors.lastname: Ding
authors.affiliation: College of Civil Engineering and Architecture, Zhejiang University of Technology, Hangzhou 310014, Zhejiang, PR China.
authors.forename: Yongjiong
authors.initials: Y
authors.lastname: Ni
mesh_terms: D000332:Aerobiosis; D001419:Bacteria / Q000235:genetics; D001483:Base Sequence; D001673:Biodegradation, Environmental; D019149:Bioreactors / Q000382:microbiology; D004275:DNA, Ribosomal / Q000235:genetics; D058645:Denaturing Gradient Gel Electrophoresis; D010084:Oxidation-Reduction; D012722:Sewage / Q000737:chemistry*; D062065:Wastewater
chemical_list: D004275:DNA, Ribosomal; D012722:Sewage; D062065:Wastewater
keywords: Aerobic granule; Continuous flow; Microbial community; Modified oxidation ditch; SBR