title: Accelerating Aerobic Sludge Granulation by Adding Dry Sewage Sludge Micropowder in Sequencing Batch Reactors.
abstract: Micropowder (20-250 µm) made from ground dry waste sludge from a municipal sewage treatment plant was added in a sequencing batch reactor (R2), which was fed by synthetic wastewater with acetate as carbon source. Compared with the traditional SBR (R1), aerobic sludge granulation time was shortened 15 days in R2. Furthermore, filamentous bacteria in bulking sludge were controlled to accelerate aerobic granulation and form large granules. Correspondingly, the SVI decreased from 225 mL/g to 37 mL/g. X-ray Fluorescence (XRF) analysis demonstrated that Al and Si from the micropowder were accumulated in granules. A mechanism hypotheses for the acceleration of aerobic granulation by adding dry sludge micropowder is proposed: added micropowder acts as nuclei to induce bacterial attachment; dissolved matters from the micropowder increase abruptly the organic load for starved sludge to control overgrown filamentous bacteria as a framework for aggregation; increased friction from the movement of micropowder forces the filaments which extend outwards to shrink for shaping granules.
authors: College of Biological and Environmental Engineering, Zhejiang University of Technology, No.18 Chao Wang Road, Hangzhou 310014, China. tanweilijun@zjut.edu.cn.|College of Civil Engineering and Architecture, Zhejiang University of Technology, No.18 Chao Wang Road, Hangzhou 310014, China. tanweilijun@zjut.edu.cn.
authors: Jun
authors: J
authors: Li
authors: College of Biological and Environmental Engineering, Zhejiang University of Technology, No.18 Chao Wang Road, Hangzhou 310014, China. liujun521282@sina.com.
authors: Jun
authors: J
authors: Liu
authors: College of Civil Engineering and Architecture, Zhejiang University of Technology, No.18 Chao Wang Road, Hangzhou 310014, China. wangdanjun0509@163.com.
authors: Danjun
authors: D
authors: Wang
authors: College of Civil Engineering and Architecture, Zhejiang University of Technology, No.18 Chao Wang Road, Hangzhou 310014, China. suimofengge-martin@163.com.
authors: Tao
authors: T
authors: Chen
authors: College of Civil Engineering and Architecture, Zhejiang University of Technology, No.18 Chao Wang Road, Hangzhou 310014, China. ctaoaaa@gmail.com.
authors: Ting
authors: T
authors: Ma
authors: Zhejiang Zone King Engineering Technology Co. Ltd., 14B, Hangzhou 310000, China. wzh@zone-king.com.
authors: Zhihong
authors: Z
authors: Wang
authors: Zhejiang Zone King Engineering Technology Co. Ltd., 14B, Hangzhou 310000, China. zwl@zone-king.com.
authors: Weilong
authors: W
authors: Zhuo
mesh_terms: D000332:Aerobiosis; D001419:Bacteria / Q000378:metabolism*; D019149:Bioreactors; D011208:Powders / Q000737:chemistry*; D012722:Sewage / Q000737:chemistry* / Q000382:microbiology; D014865:Waste Disposal, Fluid / Q000379:methods*
chemical_list: D011208:Powders; D012722:Sewage
keywords: aerobic granulation; dry sewage sludge; filamentous bacteria; granule; micropowder