首页|Four buildings and a flush:Lessons from degraded water quality and recommendations on building water management

Four buildings and a flush:Lessons from degraded water quality and recommendations on building water management

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A reduction in building occupancy can lead to stagnant water in plumbing,and the potential conse-quences for water quality have gained increasing attention.To investigate this,a study was conducted during the COV1D-19 pandemic,focusing on water quality in four institutional buildings.Two of these buildings were old(＞58 years)and large(＞19,000 m2),while the other two were new(＞13 years)and small(＜11,000 m2).The study revealed significant decreases in water usage in the small buildings,whereas usage remained unchanged in the large buildings.Initial analysis found that residual chlorine was rarely detectable in cold/drinking water samples.Furthermore,the pH,dissolved oxygen,total organic carbon,and total cell count levels in the first draw of cold water samples were similar across all buildings.However,the ranges of heavy metal concentrations in large buildings were greater than observed in small buildings.Copper(Cu),lead(Pb),and manganese(Mn)sporadically exceeded drinking water limits at cold water fixtures,with maximum concentrations of 2.7 mg Cu L-1,45.4 μg Pb L-1,1.9 mg Mn L-1.Flushing the plumbing for 5 min resulted in detectable residual at fixtures in three buildings,but even after 125 min of flushing in largest and oldest building,no residual chlorine was detected at the fixture closest to the building's point of entry.During the pandemic,the building owner conducted fixture flushing,where one to a few fixtures were operated per visit in buildings with hundreds of fixtures and multiple floors.However,further research is needed to understand the fundamental pro-cesses that control faucet water quality from the service line to the faucet.In the absence of this knowledge,building owners should create and use as-built drawings to develop flushing plans and conduct periodic water testing.

COVID-19 pandemicStagnationDrinking water qualityFlushing

Nan Wang、Teng Wang、Kang Ning、Danielle Angert、Yoorae Noh、Tolulope Odimayomi、Andrew J.Whelton

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Key Laboratory of Molecular Biophysics of the Ministry of Education,Hubei Key Laboratory of Bioinformatics and Molecular-imaging,Center of Al Biology,Department of Bioinformatics and Systems Biology,College of Life Science and Technology,Huazhong University of Science and Technology,Wuhan,430074,Hubei,China

Division of Environmental and Ecological Engineering,Purdue University,West Lafayette,IN,47907,USA

Civil,Architectural and Environmental Engineering,University of Texas,301E E Dean Keeton Street,Austin,TX,78712,USA

Lyles School of Civil Engineering,Purdue University,550 Stadium Mall Drive,West Lafayette,IN,47907,USA

Civil and Environmental Engineering,Virginia Tech,750 Drillfield Drive,Blacksburg,VA,24061,USA

Lyles School of Civil Engineering,Division of Environmental and Ecological Engineering,Purdue University,550 Stadium Mall Drive,West Lafayette,IN,47907,USA

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U.S.National Science Foundation(NSF)RAPIDUS NSF Graduate Research Fellowship(NSF GRFP)U.S.Environmental Protection Agency(EPA)Purdue University Doctoral FellowshipPurdue University Lillian Gilbreth Postdoctoral Fellowship

2027049DGE-1333468R836890

2024

10.1016/j.ese.2023.100314

环境科学与生态技术(英文)

环境科学与生态技术(英文)

ISSN：
年,卷(期)：2024.18(1)
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