Detergents in drainage systems for buildings

David P Campbell, K. D. MacLeod

    Research output: Contribution to journalArticle

    Abstract

    Current soil-waste-vent (SWV) system design guides aim to produce ventilated drainage networks for buildings which protect attached water trap seals from unwanted air pressure effects. Such effects may cause trap seal failure that are caused by airflow induction during discharge. The ventilation design guides are based on steady-state experiments utilizing cold clean water as a test media. However, most `grey' and `black' water sources are dosed with detergent, and are often warm, which significantly alters the behaviour when compared to clean water. Thus, current design standards provide only approximations of SWV system response. Results indicate that induced airflows in warm detergent-dosed water can be significantly higher than those measured in clean water systems, by a factor of more than 2. This paper quantifies the effect of detergents in SWV systems in terms of observed air entrainment rates and previously published research on the factors that contribute to air entrainment. Results of previous work are cast into dimensionless groupings suitable for inclusion into a mathematical simulation model based on a finite difference scheme. It utilizes the method of characteristics as a solution technique to simulate drainage system operation via the equations that define unsteady partially filled or full bore pipe flows and the boundary conditions represented by water traps and other common system components.

    Original languageEnglish
    Pages (from-to)1086-1092
    Number of pages7
    JournalWater Research
    Volume35
    Issue number4
    DOIs
    Publication statusPublished - Mar 2001

    Fingerprint

    Detergents
    Drainage
    Vents
    Water
    Air entrainment
    Soils
    Seals
    Pressure effects
    Pipe flow
    Ventilation
    Systems analysis
    Boundary conditions
    Air

    Keywords

    • Airflow
    • Detergent
    • Drainage
    • Simulation
    • Stack

    Cite this

    Campbell, David P ; MacLeod, K. D. / Detergents in drainage systems for buildings. In: Water Research. 2001 ; Vol. 35, No. 4. pp. 1086-1092.
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    Detergents in drainage systems for buildings. / Campbell, David P; MacLeod, K. D.

    In: Water Research, Vol. 35, No. 4, 03.2001, p. 1086-1092.

    Research output: Contribution to journalArticle

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