PMID: 11321915Apr 27, 2001Paper

A tracer study of headspace ventilation in a collector sewer

Journal of the Air & Waste Management Association
W Parker, H Ryan

Abstract

A field-scale tracer test was conducted to evaluate in-situ ventilation rates in a major collector sewer. The sewer under study was approximately 11 km long and ranged from 0.61 to 2.1 m in diameter. For the purposes of the tracer testing, the collector was divided into four reaches, each of which was tested individually. The tracer test involved injecting a measured volume of CO gas into a manhole over a short time period. CO concentrations were then measured in the collector headspace at selected manholes along the length of the reach. The technique employed successfully measured average headspace velocities over extended lengths of the collector. In a section that had a relatively stagnant headspace, approximately 1.1 km of sewer could be evaluated, with substantial tracer loss attributed to losses to manholes. In a section of the sewer with elevated headspace velocities, a section approximately 7.0 km long was successfully tested with one injection of tracer gas. The velocities observed in the collector varied substantially with time and location in the collector. The lowest velocities measured were in the upstream sections, with a minimum observed value of 3.8 m/min. The highest velocities were observed in the downstream s...Continue Reading

Citations

Dec 5, 2018·Environmental Science and Pollution Research International·Rita Ventura MatosJosé Saldanha Matos
Apr 7, 2011·Water Environment Research : a Research Publication of the Water Environment Federation·Matthew WardWayne Parker
Nov 24, 2006·Water Environment Research : a Research Publication of the Water Environment Federation·H I MadsenJ Vollertsen
Jul 1, 2020·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Gang PanStephen Edwini-Bonsu

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