基于FBG力学传感的曝气生物滤池中剪切力分布研究

doi:10.11949/0438-1157.20230017

化工学报 ›› 2023, Vol. 74 ›› Issue (4): 1755-1763.DOI: 10.11949/0438-1157.20230017

基于FBG力学传感的曝气生物滤池中剪切力分布研究

刘庆超¹^,²^,³(), 贾辉¹^,²^,³(), 许逸飞⁴, 路娜⁵, 尹延梅⁵, 王捷¹^,²^,³

^1.天津工业大学环境科学与工程学院，天津 300387
^2.天津市水质安全评价与保障技术工程中心，天津 300387
^3.天津工业大学沧州研究院，河北沧州 061000
^4.华北水利水电大学环境与市政工程学院，河南郑州 450046
^5.世韩（天津）节能环保科技有限公司，天津 300384

收稿日期:2023-01-06 修回日期:2023-03-07 出版日期:2023-04-05 发布日期:2023-06-02
通讯作者: 贾辉
作者简介:刘庆超（1996—），男，硕士研究生，liuqc0623@163.com
基金资助:
天津市农业产学研用“揭榜挂帅”项目(JBGG202207);天津工业大学沧州研究院资助项目(TGCYY-F-0103)

Study on shear-force distribution in biological aerated filter based on FBG sensing technology

Qingchao LIU¹^,²^,³(), Hui JIA¹^,²^,³(), Yifei XU⁴, Na LU⁵, Yanmei YIN⁵, Jie WANG¹^,²^,³

^1.School of Environmental Science and Engineering, Tiangong University, Tianjin 300387, China
^2.Tianjin Engineering Centre for Safety Evaluation of Water Quality & Safeguards Technology, Tianjin 300387, China
^3.Cangzhou Institute of Tiangong University, Cangzhou 061000, Hebei, China
^4.School of Environmental and Municipal Engineering，North China University of Water Resources and Electric Power, Zhengzhou 450046, Henan, China
^5.Shihan (Tianjin) Energy Conservation and Environmental Protection Technology Co. , Ltd. , Tianjin 300384, China

Received:2023-01-06 Revised:2023-03-07 Online:2023-04-05 Published:2023-06-02
Contact: Hui JIA

摘要/Abstract

摘要：

了解曝气生物滤池(biological aerated filter， BAF)中运行条件变化对反应器处理效率的影响机制具有重要意义。采用光纤布拉格光栅(fiber Bragg grating， FBG)对BAF中剪切力分布进行了原位监测。同时，借助CFD模拟计算了水力停留时间(HRT)和气水比(A/L)对BAF内部流场分布特性的影响。实验表明，剪切力的增加促进了生物膜的更新代谢，当HRT为8 h、A/L为10∶1时，生物膜量/剪切力(M/S)为0.17，BAF对COD和 $N H 4 +$ -N的去除率分别达到86.58%和82.17%。结果表明BAF内部适宜的剪切力促进了生物膜的更新代谢，提高了反应器的运行效率。因此，利用M/S探讨了剪切力对反应器运行性能的影响，可为反应器后续的优化提供理论基础。

关键词: 曝气生物滤池, 数值模拟, 光纤布拉格光栅, 生物膜, 剪切力分布, 流体力学

Abstract:

It is significant to understand the mechanism of operating conditions on the treatment efficiency of biological aerated filter (BAF). In this study, fiber Bragg grating (FBG) was used to monitor the shear-force distribution in BAF in situ. The effects of hydraulic retention time (HRT) and air-water ratio (A/L) on the internal flow field distribution characteristics of BAF were simulated by CFD. The results show that the increase of shear force promotes the renewal metabolism of biofilm. When HRT is 8 h and A/L is 10∶1, the amount of biofilm/shear force (M/S) is 0.17, and the effect of BAF on COD and $N H 4 +$ -N removal rate reached 86.58% and 82.17%, respectively. The results indicate that the appropriate shear-force inside the BAF promotes the renewal and metabolism of the biofilm and improves the operating efficiency of the reactor. Therefore, this study explored the effect of shear on the reactor operational performance by M/S and provided a theoretical basis for subsequent optimization of the reactor.

Key words: biological aerated filter, numerical simulation, fiber Bragg grating, biofilm, shear-force distribution, fluid mechanics

中图分类号:

X 703

刘庆超, 贾辉, 许逸飞, 路娜, 尹延梅, 王捷. 基于FBG力学传感的曝气生物滤池中剪切力分布研究[J]. 化工学报, 2023, 74(4): 1755-1763.

Qingchao LIU, Hui JIA, Yifei XU, Na LU, Yanmei YIN, Jie WANG. Study on shear-force distribution in biological aerated filter based on FBG sensing technology[J]. CIESC Journal, 2023, 74(4): 1755-1763.

图/表 7

图1 实验装置

Fig.1 Experimental setup

表1 FBG在反应器中的位置

Table 1 Position of FBG in the reactor

FBGs	位置/m
FBG1	0.1（底部）
FBG2	0.2（中部）
FBG3	0.3（顶部）

图2 BAF启动期间剪切力随时间的变化（a）和不同位置处剪切力的变化[(b)~(d)]

Fig.2 The change of shear-force with time during BAF start-up (a) and the change of shear force at different positions [(b)—(d)]

图3 HRT对剪切力的影响

Fig.3 Effect of HRT on shear-force

图4 不同HRT条件下反应器运行性能

Fig.4 The performance of the reactor under different HRT conditions

图5 A/L对BAF中剪切力的影响

Fig.5 Effect of A/L on shear force in BAF

图6 不同A/L条件下反应器运行性能

Fig.6 The performance of the reactor under different A/L conditions

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基于FBG力学传感的曝气生物滤池中剪切力分布研究

Study on shear-force distribution in biological aerated filter based on FBG sensing technology

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