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浙江大学学报(工学版)
Journal of ZheJiang University (Engineering Science)  2023, Vol. 57 Issue (10): 2126-2132    DOI: 10.3785/j.issn.1008-973X.2023.10.021
    
Quantitative study on incipient motion of organic sediments with bio-adhesive effect
Si-ning ZHAN1(),Dong-dong YUAN2,Yong-gang LIN3,Yi-ping ZHANG1,Yong-chao ZHOU1,*(),Tu-qiao ZHANG1
1. College of Civil Engineering and Architecture, Zhejiang University, Hangzhou, 310058, China
2. Powerchina Environmental Epaperngineering Co Ltd., Hangzhou, 310058, China
3. Powerchina Roadbridge Group Co Ltd., Hangzhou, 310058, China
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Abstract  

A calculation method of the critical shear stress considering the microbial incubation time and organic matter content was proposed to study the influence of microbial biofilm on the erosion behavior of sediment. An open channel flume experiment was conducted to analyze the effects of microbial incubation time and organic matter content on the critical shear stress. The stable floc size constant γ was introduced to quantify the bio-adhesive effect. An empirical formula for the critical shear stress of sediment initiation with organic matter under microbial activity was proposed based on the theory of sediment initiation. Results showed that the critical shear stress increased first and then decreased over time. The peak value was reached around 10 or 15 days, and the critical shear stress reached 0.072~0.117 N/m2. The critical starting shear stress decreased with the increase of organic matter content. The correlation between the bio-adhesive effect and γ was calculated and a significant negative correlation was found. Pearson correlation coefficient was ?0.767. The calculated value of the critical starting shear stress formula was in good agreement with the experimental value.

Key words： sewer sediment      biological activities      organic matter content      critical shear stress      floc strength     
Received: 01 December 2022      Published: 18 October 2023
CLC:  TV 142.1  
Fund:  国家自然科学基金资助项目（51878597）
Corresponding Authors: Yong-chao ZHOU     E-mail: 22012243@zju.edu.cn;zhoutang@zju.edu.cn
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Si-ning ZHAN
Dong-dong YUAN
Yong-gang LIN
Yi-ping ZHANG
Yong-chao ZHOU
Tu-qiao ZHANG
Cite this article:

Si-ning ZHAN,Dong-dong YUAN,Yong-gang LIN,Yi-ping ZHANG,Yong-chao ZHOU,Tu-qiao ZHANG. Quantitative study on incipient motion of organic sediments with bio-adhesive effect. Journal of ZheJiang University (Engineering Science), 2023, 57(10): 2126-2132.

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https://www.zjujournals.com/eng/10.3785/j.issn.1008-973X.2023.10.021     OR     https://www.zjujournals.com/eng/Y2023/V57/I10/2126


微生物作用下含有机质沉积物起动的定量研究

为了探究微生物作用对沉积物起动规律的影响，提出考虑微生物培养时间和有机质含量的沉积物临界起动剪切应力计算方法. 通过明渠冲刷试验分析了微生物培养时间及有机质含量对沉积物临界起动剪切应力的影响规律；引入絮体强度常数γ值对微生物黏性作用进行定量表征；基于沉积物起动理论，提出在微生物作用下沉积物的临界起动剪切应力经验公式. 结果表明，随着微生物作用时间的增加，临界起动剪切应力先增大后减小，并在10或15 d左右达到峰值，最终达到0.072~0.117 N/m2. 临界起动剪切应力随着有机质含量的增大而减小. 微生物黏性作用与γ值呈现显著的负相关，皮尔逊相关系数为?0.767，临界起动剪切应力公式计算值与实验值较为吻合.


关键词： 沉积物,  微生物活动,  有机质含量,  临界起动剪切应力,  絮体强度 
Fig.1 Scheme of experimental open channel flume
Fig.2 Scheme of cylinder stirring experiment
N/(r·min?1) G/s?1
160 78.93
175 90.29
190 102.15
205 114.48
220 127.27
Tab.1 Stirring speed and velocity gradient of cylinder stirring experiment
目数 ρ/(g·cm?3) d50/mm Cu
60 1.409 0.427 1.51
Tab.2 Physical parameters of plastic sand
序号 T/d OMC/% 序号 T/d OMC/% 序号 T/d OMC/%
1 0 2.0 13 10 5.0 25 20 8.0
2 0 3.5 14 10 6.5 26 25 2.0
3 0 5.0 15 10 8.0 27 25 3.5
4 0 6.5 16 15 2.0 28 25 5.0
5 0 8.0 17 15 3.5 29 25 6.5
6 5 2.0 18 15 5.0 30 25 8.0
7 5 3.5 19 15 6.5 31 30 2.0
8 5 5.0 20 15 8.0 32 30 3.5
9 5 6.5 21 20 2.0 33 30 5.0
10 5 8.0 22 20 3.5 34 30 6.5
11 10 2.0 23 20 5.0 35 30 8.0
12 10 3.5 24 20 6.5 — — —
Tab.3 Incubation time and organic matter content of sediments
Fig.3 Change of critical shear stress at different experiment conditions
Fig.4 Average floc diameter of sediments at different G
Fig.5 Change of stable floc size constant with microbial activity time for different sediments
Fig.6 Comparison of calculated and experimental values of stable floc size constant
Fig.7 Relationship between bio-adhesive effect and stable floc size constant
Fig.8 Comparison of calculated and experimental values of critical shear stress
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