摘要
为了建立适合基于大范围、长周期、低维护在线监测的雨水管网混接诊断技术,研究建立了基于电导率的相对水平混接程度分级标准,经对比发现其与总氮和氨氮的绝对偏差较低,具有较好稳定性与准确性。标准建立过程中需识别电导率本底特征,为此开展了日变化、时变化、前期晴天数及降雨强度对本底值的影响分析。结果显示,在研究区域内日变化及时变化影响并不显著,而前期晴天数存在一定的影响,当选取不低于3 d的旱天作为数据采集周期时,混接等级计算的准确性更高。基于电导率在线数据,采用混接程度分级、污染来源解析及上有下游多点位联动追踪的系统方法,可以有效开展雨水管段上下游污染溯源与雨水接户井混接识别。
In order to establish a diagnostic technology for rainwater pipe network mixing based on large-scale,long-term,and low maintenance online monitoring,this study established a relative horizontal mixing degree grading standard based on conductivity values.After comparison,it was found that its absolute deviation from total nitrogen and ammonia nitrogen was low,and it had good stability and accuracy.In the process of establishing standards,it was necessary to identify the background characteristics of conductivity.Therefore,an analysis was conducted on the impact of daily variation,hourly variation,number of clear days in the early stage,and rainfall intensity on the background value.The results showed that the timely variation of daily variation did not have a significant impact in the study area,while the number of clear days in the early stage had a certain impact.When selecting dry days of no less than 3 days as the data collection cycle,the accuracy of mixing level calculation was higher.Based on online conductivity data,a systematic method is adopted to classify the degree of mixing,analyze the sources of pollution,and track the linkage of upstream and downstream multiple points,which can effectively carry out the tracing of pollution sources in rainwater pipe sections and the identification of mixing in rainwater connecting households.
作者
陈则宏
CHEN Zehong(Fuzhou Binhai Water Service Development Co.,Ltd.,Fuzhou 350207,China)
出处
《净水技术》
CAS
2024年第12期160-170,共11页
Water Purification Technology
基金
福州新区滨海新城排水管网在线监测设备一期第一批(水质监测)采购项目(2022.362)
福州滨海新城分流制排水管道混接诊断技术应用效果研究(BHSW2022001)。
关键词
雨水管网
电导率
在线监测
混接诊断
异常识别
storm sewer networks
electrical conductivity
online monitoring
mixed connection diagnosis
abnormal recognition