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排水管道中雨污水颗粒物沉降速率特征分析

吴俊

吴俊. 排水管道中雨污水颗粒物沉降速率特征分析[J]. 环境工程, 2023, 41(4): 1-9. doi: 10.13205/j.hjgc.202304001
引用本文: 吴俊. 排水管道中雨污水颗粒物沉降速率特征分析[J]. 环境工程, 2023, 41(4): 1-9. doi: 10.13205/j.hjgc.202304001
WU Jun. ANALYSIS OF SETTLING VELOCITY OF PARTICULATES IN FLOWS IN DRY AND WET WEATHER FROM THE COMBINED SEWER[J]. ENVIRONMENTAL ENGINEERING , 2023, 41(4): 1-9. doi: 10.13205/j.hjgc.202304001
Citation: WU Jun. ANALYSIS OF SETTLING VELOCITY OF PARTICULATES IN FLOWS IN DRY AND WET WEATHER FROM THE COMBINED SEWER[J]. ENVIRONMENTAL ENGINEERING , 2023, 41(4): 1-9. doi: 10.13205/j.hjgc.202304001

排水管道中雨污水颗粒物沉降速率特征分析

doi: 10.13205/j.hjgc.202304001
基金项目: 

上海城投(集团)有限公司科技创新计划项目(CTKY-ZDZX-2022-003)

上海"超级博士后"激励计划资助(2020183)

国家重点研发计划(2022YFC3801004)

上海"超级博士后"资助项目上海城投(集团)有限公司配套专项(CTKY-PTZX-2022-028)

2021年深圳环水科技技术咨询课题"深圳排海干渠运行风险检测及评估项目——技术咨询工作"(深环水管网科技招(投)字(2021)223号)

详细信息
    作者简介:

    吴俊(1988-),男,博士,工程师,主要从事排水系统提质增效及河流污染治理相关研究及工程实践。wujunz2929@sina.com

ANALYSIS OF SETTLING VELOCITY OF PARTICULATES IN FLOWS IN DRY AND WET WEATHER FROM THE COMBINED SEWER

  • 摘要: 排水管道可接纳雨水径流和旱流污水,雨天形成雨污混合水,水流中部分颗粒沉降至管底形成沉积物。对比分析上述各环节中颗粒物的沉降速率特征,有助于提高对雨污混合水的管控效率。研究选取某合流管段,采集雨污混合水、雨水径流、管道沉积物及旱流污水,并采用淘析分离方法,开展颗粒物沉降速率(SV)特征分析,基于此建立颗粒物沉降速率与质量占比的拟合关系。结果显示,雨污混合水中颗粒物SV≥0.265 mm/s的比例与管道沉积物相近,且与雨水径流及旱流污水存在一定差异,说明在雨天水流运行过程中,部分管道沉积物被冲起,使雨污混合水中颗粒物SV得到显著提升。进一步分析显示,在每个SV下,降雨量越高,低于该SV的颗粒占比更少,且不易沉降的颗粒态污染物占比将会更高。该结果一方面说明,在较高雨量下SV较高的颗粒物更多被冲刷进入雨污混合水中;另一方面也说明,当雨天管网水量增加时,将会有更多不易沉降的颗粒态污染物进入管网下游,重力沉降设施的拦截效率将会显著下降。不同污染物的富集情况显示,PAHs、Cd、Cr和Pb在SV≥0.265 mm/s的颗粒物中占比较高,因此当设定SV=0.265 mm/s对雨污混合水进行重力沉降处理时,PAHs、Cd、Cr和Pb 4类有害污染物将会得到有效削减。基于上述数据建立了颗粒物SV与质量占比关系特征,即x=lnB/(A-y)(R2>0.95),该结果有助于实现特定SV下的颗粒物及颗粒态污染物质量比的快速转化。
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出版历程
  • 收稿日期:  2022-02-25
  • 网络出版日期:  2023-05-26
  • 刊出日期:  2023-04-01

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