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Tackling knowledge gaps on hospital wastewater systems

Peter Orendecki, Senior Contracts manager and Water AP at University Hospital Southampton NHS Foundation Trust, highlights ‘the apparent lack of understanding of the risks’ posed by hazardous bacteria in hospital wastewater systems among some designers, architects, and even Infection Control personnel.

In the second in a series of hospital wastewater-related articles running in HEJ this year (the first was published last month), Peter Orendecki, Senior Contracts manager and Water AP at University Hospital Southampton NHS Foundation Trust, highlights the apparent lack of understanding of the risks posed by hazardous bacteria in hospital waste systems among some designers, architects, and even infection control personnel. He asks whether there may here be an opportunity here for the UK to lead in such systems’ design.

The general design of effluent drainage within all buildings broadly relies on gravity to allow waste water from a number of different processes – including, but not limited to, handwashing, dish cleaning, showering, the use of toilets, macerators, bedpan washer-disinfectors, and other clinical uses, to drain away from the point of use into a vertical pipe, known as a stack. An individual stack receives all wastewater sources in its vicinity and all stacks link to the main sewer, effectively linking all drainage within a building. The lack of segregation of wastewater systems is a major factor in allowing microbes to move from one area of a hospital to another via different modes of transport, active growth, movement of air, and aerosols and the wastewater itself.

At the proximal end of the drainage system waste traps of various designs are used to hold water, thereby separating the drainage system air from the air in the local environment. This comes with its own issues. Bacteria dwell in the U-bend and form complex biofilms. Disposing of a carbon source down a sink drain will stimulate the growth of biofilm up the vertical section of the drain at a rate of 1 mm/hour, reaching the sieve at the top of the drain. Water from an outlet directly hitting the sieve can disperse organisms in the biofilm up to 2 m away. (see Figure 1).

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Upcoming Events

Futurebuild 2024

ExCeL, London
5th - 7th March 2024

The Fire Safety Event 2024

National Exhibition Centre (NEC), Birmingham
30th April - 2 May 2024

Wales regional conference, exhibition and awards dinner 2024

International Conference Centre (ICC) Newport
28th - 29th May 2024

NAHFO National Conference 2024

Crowne Plaza Newcastle Upon Tyne
3rd - 5th June 2024

Design in Mental Health 2024

Manchester Central
4th - 5th June 2024

InstallerSHOW 2024

National Exhibition Centre (NEC), Birmingham
25th - 27th June

Access the latest issue of Health Estate Journal on your mobile device together with an archive of back issues.

Download the FREE Health Estate Journal app from your device's App store

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