Evaluation of the shear stability of aerobic granular sludge from a pilot-scale membrane bioreactor:Establishment of a quantitative method  

作　　者：Biao Yang Bingduo Wang Liying Bin Weirui Chen Xinyi Chen Ping Li Shanglong Wen Shaosong Huang Zhiqi Zhang Bing Tang 

机构地区：[1]School of Environmental Science and Engineering,Guangdong University of Technology,Guangzhou 510006,China [2]Guangdong Guangshen Environmental Protection Technology Co.,Ltd.,Guangzhou 510663,China [3]Guangdong Yuehai Water Investment Co.,Ltd.,Shenzhen 518000,China

出　　处：《Journal of Environmental Sciences》2025年第2期579-590,共12页环境科学学报(英文版)

基　　金：supported by the Key Technologies Research and Development Program of Guangzhou (No.2023B03J1284);Guangdong Yuehai Water Investment Co.,Ltd. (No.CC80-QT01-2020-0010).

摘　　要：This work established a quantitative method to access the shear stability of aerobic granular sludge(AGS)and validated its feasibility by using the mature AGS from a pilot-scale(50 tons/day)membrane bioreactor(MBR)for treating real municipal wastewater.The results showed that the changing rate( S)of the peak area(S)of granule size distribution(GSD)exhibited an exponential relationship(R^(2)≥0.76)with the shear time(y=a−b·c^(x)),which was a suitable indicative index to reflect the shear stability of different AGS samples.The limiting granule size(LGS)was defined and proposed to characterize the equilibrium size for AGS after being sheared for a period of time,whose value in terms of Dv50 showed high correlation(R^(2)=0.92)with the parameter a.The free Ca^(2+)(28.44-34.21 mg/L)in the influent specifically interacted with polysaccharides(PS)in the granule’s extracellular polymeric substance(EPS)as a nucleation site,thereby inducing the formation of Ca precipitation to enhance its Young’s modulus,while Ca^(2+) primarily interacted with PS in soluble metabolic product(SMP)during the initial granulation process.Furthermore,the Young’s modulus significantly affected the parameter a related to shear stability(R^(2)=0.99).Since the parameter a was more closely related(R^(2)=1.00)to S than that of the parameter b or c,the excellent correlation(R^(2)=0.99)between the parameter a and the wet density further verified the feasibility of this method.

关 键 词：Shear stability Quantitative evaluation Aerobic granular sludge Membrane bioreactor Pilot-scale study Municipal wastewater 

分 类 号：X70[环境科学与工程—环境工程]