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| POD Analysis and Low-Dimensional Model Based on POD-Galerkin for Two-Dimensional Rayleigh-Bénard Convection | |
| 作者姓名： | Hanghang M Xin Zheng Yue Wang Jianping Chen Hongna Zhang Weihua Cai |
| 作者单位： | School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, China,School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150001, China;Université de Lyon， CNRS, INSA-Lyon, Université Claude Bernard Lyon 1, CETHIL UMR5008, F-69621, Villeurbanne, France,School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, China,School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, China,School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, China and School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, China |
| 摘 要： | 北方生活小区供水管网生物稳定性和影响因素研究 张新瑜，付 英 （济南大学 土木建筑学院，济南 250022） 创新点说明： 1）采用可生物降解溶解性有机碳（BDOC）评价管网水生物稳定性，方法快捷，避免细菌内源代谢的问题，测定准确性高； 2）确定了主要的常规水质指标和BDOC之间的相关关系； 3）提出了控制管网水质生物稳定性的措施。 研究目的： 为了评价北方生活小区管网水质生物稳定性；研究常规水质指标和生物稳定性的关系；确定管网水质生物稳定性的主要影响因素；最终提出管网水质生物稳定性的控制措施。 研究方法： 1）实验室供水管段的静态实验 选择与供水管网中使用相同材质的管段，进行实验，测定常规水质指标和BDOC，采用主成分分析，确定对BDOC影响较大的水质指标； 2）小区供水管网检测试验 通过对小区供水管网的现场实勘，根据检测点设置的原则，合理设置检测点，采样测试分析。 结果： 1）小区供水管网入口处，余氯浓度较高，对细菌的限制作用较大，BDOC浓度较高，随着管线延伸，余氯浓度逐渐降低，细菌活动增强，消耗管网水中的BDOC，BDOC浓度逐渐降低； 2）细菌的活动导致管网水浊度的升高，管网水力条件的改变，冲刷管壁也会增加管网水浊度； 3）所研究的生活小区管网水的pH是逐渐降低的，这是铁细菌和硫酸盐还原菌共同作用的结果。 结论： 1）所研究的生活小区管网水夏季和冬季的BDOC分别是1.39 和2.17 mg/L，管网水属于生物略不稳定水； 2）夏季管网水中的BDOC和余氯浓度沿着管网是逐渐降低的，而冬季BDOC的浓度是先降低，然后上升。管网水中BDOC的变化是余氯和细菌共同作用的结果； 3）BDOC和浊度有很强的相关性，水中的悬浮颗粒和管道腐蚀物都会增加管网水浊度； 4）水务部门定期维护供水管网，在建造新的管网时，采用非金属管材，可以降低管网水的浊度，提高管网水质。 关键词：可生物降解溶解性有机碳；供水管网；生物稳定性；水质；微生物可利用磷 |
| 关 键 词： | Rayleigh-Bénard convection proper orthogonal decomposition (POD) low-dimensional model POD-Galerkin direct numerical simulation (DNS) CLC number: O357.1 |
| 收稿时间： | 2017/3/15 0:00:00 |
Analysis on Biological Stability and Influencing Factors of Northern Living District Water Distribution System |
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| Hanghang M,Xin Zheng,Yue Wang,Jianping Chen,Hongna Zhang,Weihua Cai.Analysis on Biological Stability and Influencing Factors of Northern Living District Water Distribution System[J].Journal of Harbin Institute of Technology,2018,25(1):67-78. | |
| Authors: | Hanghang M Xin Zheng Yue Wang Jianping Chen Hongna Zhang and Weihua Cai |
| Affiliation: | School of Civil Engineering and Architecture, University of Jinan, Jinan 250022, China |
| Abstract: | A northern living strict water network was employed to investigate interaction among biological stability and classical water quality indexes. Key water quality indexes on water quality were determined by the static test, then the correlations between biological stability and traditional water quality parameters were analyzed. Traditional water quality parameters and limited factors on bacteria were measured in summer and winter respectively. The results show that BDOC concentration change differently in summer and winter. Among classical parameters turbidity has a positive relation with BDOC but pH has a negative relation with BDOC. Total bacteria number shows a positive correlation with BDOC in the water distribution system. Residual chlorine shows a negative relation with total bacteria number. Fe content increasing will induce turbidity rising in water. To guarantee water safety, BDOC and chlorine content control must be incorporated together to restrict bacteria regrowth. |
| Keywords: | biodegradable dissolved organic carbon water distribution system biological stability water quality microbially available phosphorus |
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