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浙江大学学报(工学版)
Journal of ZheJiang University (Engineering Science)  2019, Vol. 53 Issue (9): 1704-1710    DOI: 10.3785/j.issn.1008-973X.2019.09.009
Civil and Architecture Engineering     
Spatiotemporal change rules of water quality in cut-off water pipelines in district metering areas (DMA)
Da CHEN1(),Jing-qing LIU1,*(),Huan-yu CHEN2,Ruo-wei WANG1
1. College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310058, China
2. Binhai Industrial Technology Research Institute of Zhejiang University, Zhejiang University, Tianjin 300301, China
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Abstract  

The pilot platform was constructed with water pipelines of nine years old to study the spatiotemporal changes of essential physical, chemical and biological parameters of water in cut-off pipelines, in order to explore the potential impact of cut-off pipelines and stagnant areas which are created in the construction of district metering areas (DMAs) on water quality. Results show that, as the depth of cut-off pipeline increases, the biofilm and limescale fall off more quickly and the water quality deterioration rate gets faster; the temporal changes of iron release, turbidity and microorganism vary with time at different depths. After twelve hours, the water quality deterioration rate was significantly accelerated. The correlation analysis of the deterioration of water quality parameters shows that, the deeper the depth of cut-off pipeline is, the less the water disturbed by the main pipe is and the higher the correlation level of each parameter is.

Key words： district metering area (DMA)      cut-off pipeline      iron release      stagnation      spatiotemporal change     
Received: 03 March 2019      Published: 12 September 2019
CLC:  TU 991  
Corresponding Authors: Jing-qing LIU     E-mail: 18258883680@126.com;liujingqing@zju.edu.cn
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Da CHEN
Jing-qing LIU
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Ruo-wei WANG
Cite this article:

Da CHEN,Jing-qing LIU,Huan-yu CHEN,Ruo-wei WANG. Spatiotemporal change rules of water quality in cut-off water pipelines in district metering areas (DMA). Journal of ZheJiang University (Engineering Science), 2019, 53(9): 1704-1710.

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http://www.zjujournals.com/eng/10.3785/j.issn.1008-973X.2019.09.009     OR     http://www.zjujournals.com/eng/Y2019/V53/I9/1704


独立计量分区截断管水质时空变化规律

为探究城市供水管网独立计量分区（DMA）建设过程中形成的分区截断管道和滞流区对供水管网水质的潜在影响，以管龄为9 a的实际供水管道为研究对象，设计并搭建试验平台，研究DMA分区截断管道内管网水关键水质理化指标、生物指标的时空变化规律. 研究结果表明：随着截断管深度的增加，管壁生物膜和管垢脱落速度加快，水质恶化速率加快；铁释放、浊度和活菌浓度在不同管深处随时间的变化情况不同，12 h后，水质恶化速率明显加快；各水质指标恶化的相关性分析显示，截断管越深，水质受到主干管的扰动越少，各指标相关性水平越高.


关键词： 独立计量分区(DMA),  截断管,  铁释放,  滞流工况,  时空变化 
Fig.1 Water quality pilot platform of cut-off pipelines
Fig.2 Photos of ductlie cast-iron pipe inner surface
Fig.3 Scanning electron microscope images of limescale on ductlie cast-iron pipe
指标 数值 单位
水温 10±2 °C
电导率 215±10 μs/cm
浊度 0.7±0.3 NTU
溶解氧 12±0.5 mg/L
pH 7.3±0.1 /
氮的质量浓度 2.2±0.1 mg/L
铁的质量浓度 0.07±0.03 mg/L
余氯的质量浓度 0.4±0.05 mg/L
HPC 20±20 CFU/mL
Tab.1 Outlet water quality indexes of water tank
Fig.4 Changes of water quality parameters in pilot platform
Fig.5 Changes of dissolved oxygen and iron mass concentration in pilot platform
Fig.6 Trend relationship between DO and iron mass concentration
D/m TU DO σ HPC
注：*表示在0.01水平上显著相关，**表示在0.05水平上显著相关
1 0.908** ?0.581* 0.937** 0.746**
2 0.876** ?0.893** 0.986** 0.731**
3 0.902** ?0.921** 0.985** 0.786**
4 0.990** ?0.965** 0.978** 0.712**
Tab.2 Pearson correlation and significance levels between iron mass concentration and other parameters
D/m TU DO σ HPC
注：*表示在0.01水平上显著相关，**表示在0.05水平上显著相关
1 ?0.581* ?0.684** ?0.545* ?0.724**
2 ?0.893** ?0.727** ?0.906** ?0.558*
3 ?0.921** ?0.813** ?0.927** ?0.767**
4 ?0.965** ?0.960** ?0.953** ?0.614**
Tab.3 Pearson correlation and significance levels between DO and other parameters
Fig.7 Trend of correlation between water quality parameters
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