title: Decreasing effect and mechanism of moisture content of sludge biomass by granulation process.
abstract: Disposal of a high volume of sludge significantly raises water treatment costs. A method for cultivating aerobic granules in a sequencing batch airlift bioreactor to significantly produce lower moisture content is described. Results indicate that optimization of settling time and control of the shear stresses acted on the granules. The diameter of the granule was within the range of 1.0-4.0 mm, and its sludge volume index was stabilized at 40-50 mL g(-1). Its specific gravity was increased by a factor of 0.0392, and specific oxygen uptake rate reached 60.126 mg h(-1) g(-1). Moreover, the percentage of its moisture content in the reactor ranged from 96.73% to 97.67%, and sludge volume was reduced to approximately 60%, greatly due to the presence of extracellular polymeric substances in the granules, as well as changes in their hydrophobic protein content. The removal rate of chemical oxygen demand and [Formula: see text] reaches up to 92.6% and 98%, respectively. The removal rates of total phosphorus is over 85%. Therefore, aerobic granular sludge process illustrates a good biological activity.
authors.affiliation: a College of Petrochemical Technology , Lanzhou University of Technology , Lanzhou 730050 , People's Republic of China.
authors.forename: Xia
authors.initials: X
authors.lastname: Zhao
authors.affiliation: a College of Petrochemical Technology , Lanzhou University of Technology , Lanzhou 730050 , People's Republic of China.
authors.forename: Hao
authors.initials: H
authors.lastname: Xu
authors.affiliation: b State Key Laboratory of Urban Water Resource and Environment, School of Municipal and Environmental Engineering , Harbin Institute of Technology , Harbin 150090 , People's Republic of China.
authors.forename: Jimin
authors.initials: J
authors.lastname: Shen
authors.affiliation: a College of Petrochemical Technology , Lanzhou University of Technology , Lanzhou 730050 , People's Republic of China.
authors.forename: Bo
authors.initials: B
authors.lastname: Yu
authors.affiliation: b State Key Laboratory of Urban Water Resource and Environment, School of Municipal and Environmental Engineering , Harbin Institute of Technology , Harbin 150090 , People's Republic of China.
authors.forename: Xiaochun
authors.initials: X
authors.lastname: Wang
mesh_terms: D000332:Aerobiosis; D057919:Biological Oxygen Demand Analysis; D018533:Biomass; D019149:Bioreactors; D010758:Phosphorus / Q000378:metabolism; D012722:Sewage / Q000032:analysis*; D033081:Shear Strength; D014865:Waste Disposal, Fluid / Q000379:methods*
chemical_list: D012722:Sewage; D010758:Phosphorus
keywords: biomass; granulation; hydrophobicity; low moisture content; sequencing batch airlift bioreactor