基于FLUENT的截污干渠设计参数对末端TP质量浓度的影响  

Influence of FLUENT-based design parameters of sewage interception trunk on total phosphorus concentration at the trunk endpoint

作　　者：曾祥平 付楠楠 丁文川[1,2] 唐鑫如 吴思 曾晓岚[1,2] 张玉 罗万申 ZENG Xiangping;FU Nannan;DING Wenchuan;TANG Xinru;WU Si;ZENG Xiaolan;ZHANG Yu;LUO Wanshen(Key Laboratory of the Three Gorges Reservoir Region’s Eco-Environment Under Ministry of Education;Low Carbon Green Building International Joint Research Center,Chongqing University,Chongqing 400045,P.R.China;Southwest Municipal Engineering Design&Research Institute of China,Chengdu 610081,P.R.China)

机构地区：[1]重庆大学三峡库区生态环境教育部重点实验室,重庆400045 [2]重庆大学低碳绿色建筑国际联合研究中心,重庆400045 [3]中国市政工程西南设计研究总院有限公司,成都610081

出　　处：《重庆大学学报》2024年第12期24-34,共11页Journal of Chongqing University

基　　金：重庆大学大型仪器设备开放基金项目(202303150125)。

摘　　要：滇池环湖截污干渠在输运农村农业面源污水时,TP质量浓度会沿程降低且在截污干渠末端低于水质净化厂设计进水质量浓度,导致水厂TP无法达标排放。为探究截污干渠主要设计参数对输运末端农村农业面源TP质量浓度的影响,为截污干渠设计提供技术参考,研究针对建设完善的滇池东岸截污干渠所运输的农村农业面源污水,以颗粒态磷为主要对象,利用FLUENT三维模拟软件构建了滇池东岸截污干渠流体的多相流模型并进行流动过程的模拟,分析了截面形状、粗糙度、水力直径、坡度等主要设计参数对干渠末端出口TP质量浓度的影响。结果表明,末端TP质量浓度圆形截面最低,梯形最高;末端出口TP质量浓度随粗糙度增大均升高;随水力直径或坡度的增大,矩形及梯形截面的末端出口TP质量浓度增加或降低,圆形截面则总体降低或变化不大。As agricultural non-point source runoff is transported to a wastewater treatment plant by the sewage interception trunk around Dianchi Lake,the total phosphorus(TP)concentration decreases along the way,often falling below the designed influent concentration at the trunk’s endpoint.This reduction can result in non-compliance with discharge standards.To explore the influence of key design parameters on endpoint TP concentration and provide technical guidance for sewage interception trunk design,this study focuses on granular phosphorus from agricultural runoff transported by a well-designed sewage interception trunk on the eastern bank of Dianchi Lake.Using the three-dimensional simulation software FLUENT,a multiphase flow model was constructed to stimulate the fluid flow process within the trunk.The influences of section shape,roughness,hydraulic diameter,and slope on the endpoint TP concentration were analyzed.Results show that the endpoint TP concentration is lowest for circular cross sections and highest for trapezoidal sections.As roughness increases,TP concentration rises across all section shapes,with the smallest variation range in rectangular sections,and the largest in circular sections.Increasing hydraulic diameter or slope results in increased or decreased TP concentration for rectangular or trapezoidal sections,while in circular sections,TP concentration either decreases or shows minimal change.

关 键 词：TP质量浓度 农村农业面源 截污干渠 设计参数 多相流数值模拟 

分 类 号：X703[环境科学与工程—环境工程]