Physical, Chemical, and Microbiological Water Quality Variation between City and Building and within Multistory Building

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

Municipal drinking water entering buildings can experience degraded water quality due to in-building water treatment devices, plumbing design, materials, and occupancy patterns. To understand water quality patterns, we installed online sensors and collected grab samples throughout a multistory university building to quantify temporal and spatial fluctuations in temperature, pH, free chlorine, dissolved copper, trihalomethanes (THMs), cellular adenosine triphosphate (cATP), and organic matter surrogate (UV254). A whole-building water softener had a detrimental impact on water quality, increasing pH, decreasing disinfectant residual, and increasing THMs. Disinfectant residual was always greatest at the building inlet, with little to no measurable free chlorine at sinks and water fountains. Cellular adenosine triphosphate levels were lowest at the building inlet and measured greater at water fountains. Copper levels were <0.2 mg/L entering the building but ranged from 0.5 to 1.5 mg/L within the building. HVAC operations resulted in less variability for in-building water temperature than at the water treatment plant with temperatures averaging 5 °C warmer inside the building than at the building inlet. Trihalomethane concentrations were influenced by chlorine residual, pH, and water demand, with consistently higher in-building measurements than at the building inlet. Trihalomethane speciation remained constant throughout the study with chloroform being the greatest contributor to speciation, followed by dichlorobromoform, dibromochloromethane, and finally bromoform.

Original languageEnglish (US)
Pages (from-to)1369-1379
Number of pages11
JournalACS ES and T Water
Volume1
Issue number6
DOIs
StatePublished - Jun 11 2021

Keywords

  • building occupancy
  • cellular adenosine triphosphate (cATP)
  • chlorine
  • copper
  • premise plumbing
  • trihalomethanes

ASJC Scopus subject areas

  • Chemical Engineering (miscellaneous)
  • Chemistry (miscellaneous)
  • Environmental Chemistry
  • Water Science and Technology

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