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浙江大学学报(工学版)
浙江大学学报(工学版)  2023, Vol. 57 Issue (10): 2126-2132    DOI: 10.3785/j.issn.1008-973X.2023.10.021
土木工程     
微生物作用下含有机质沉积物起动的定量研究
占斯宁1(),袁栋栋2,林永钢3,张仪萍1,周永潮1,*(),张土乔1
1. 浙江大学 建筑工程学院，浙江 杭州 310058
2. 中国电建集团环境工程有限公司，浙江 杭州 310058
3. 中电建路桥集团有限公司，浙江 杭州 310058
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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摘要：

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    
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
收稿日期: 2022-12-01 出版日期: 2023-10-18
CLC:  TV 142.1  
基金资助: 国家自然科学基金资助项目（51878597）
通讯作者: 周永潮     E-mail: 22012243@zju.edu.cn;zhoutang@zju.edu.cn
作者简介: 占斯宁（1998—），女，硕士生，从事城市排水管道沉积物管理研究. orcid.org/0000-0003-3567-1384. E-mail： 22012243@zju.edu.cn
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占斯宁
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周永潮
张土乔

引用本文:

占斯宁,袁栋栋,林永钢,张仪萍,周永潮,张土乔. 微生物作用下含有机质沉积物起动的定量研究[J]. 浙江大学学报(工学版), 2023, 57(10): 2126-2132.

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.

链接本文:

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

图 1  小型明渠冲刷试验的装置图
图 2  圆筒搅拌试验装置的示意图
N/(r·min?1) G/s?1
160 78.93
175 90.29
190 102.15
205 114.48
220 127.27
表 1  圆筒搅拌试验的搅拌转速及速度梯度
目数 ρ/(g·cm?3) d50/mm Cu
60 1.409 0.427 1.51
表 2  塑料沙的物理参数
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 — — —
表 3  沉积物试样的培养时间及有机质含量
图 3  不同工况下的临界起动剪切应力图
图 4  不同G值下沉积物试样的絮体平均直径
图 5  沉积物试样絮体强度常数随时间变化的示意图
图 6  絮体强度常数计算值与实验值的对比结果
图 7  生物黏性作用与絮体强度常数的关系
图 8  临界剪切应力计算值与实验值的对比结果
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