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浙江大学学报(工学版)  2019, Vol. 53 Issue (9): 1704-1710    DOI: 10.3785/j.issn.1008-973X.2019.09.009
土木与建筑工程     
独立计量分区截断管水质时空变化规律
陈达1(),柳景青1,*(),陈环宇2,王若玮1
1. 浙江大学 建筑工程学院,浙江 杭州 310058
2. 浙江大学 滨海产业技术研究院,天津 300301
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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摘要:

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    
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
收稿日期: 2019-03-03 出版日期: 2019-09-12
CLC:  TU 991  
通讯作者: 柳景青     E-mail: 18258883680@126.com;liujingqing@zju.edu.cn
作者简介: 陈达(1994—),男,硕士生,从事给水管网水质研究. orcid.org/0000-0002-3001-3035. E-mail: 18258883680@126.com
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引用本文:

陈达,柳景青,陈环宇,王若玮. 独立计量分区截断管水质时空变化规律[J]. 浙江大学学报(工学版), 2019, 53(9): 1704-1710.

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.

链接本文:

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

图 1  截断管水质试验中试平台
图 2  球墨铸铁管道内壁现场图
图 3  球墨铸铁管腐蚀瘤扫描电镜图
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
表 1  水箱水出水水质指标
图 4  试验平台水质各指标变化
图 5  试验平台中溶解氧、铁的质量浓度的变化
图 6  溶解氧和铁的质量浓度之间的走势关系
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**
表 2  铁的质量浓度与其他水质指标的Pearson相关性和显著性水平
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**
表 3  溶解氧(DO)与其他水质指标的Pearson相关性和显著性水平
图 7  各水质指标之间的相关性走势
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