ZHANGHai-han,LIUXiang,XULei,et al.Characteristics of Bacterial Growth in Indoor Drinking Water Pipeline Induced by Summer Overnight Stagnation[J].China Water & Wastewater,2024,40(11):57-64.
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Characteristics of Bacterial Growth in Indoor Drinking Water Pipeline Induced by Summer Overnight Stagnation

China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU] volume: 第40卷 Number: 第11期 Page: 57-64 Column: Date of publication: 2024-06-01
Author(s):
ZHANG　Hai-han1; 2;  LIU　Xiang1; 2;  XU　Lei1; 2;  HUANG　Ting-lin1; 2
（1. Shaanxi Key Laboratory of Environmental Engineering， School of Environmental and Municipal Engineering， Xi’an University of Architecture and Technology， Xi’an 710055， China；2.Key Laboratory of Northwest Water Resource， Environment and Ecology ， Xi’an 710055， China）
Keywords:
indoor drinking water pipeline;  overnight stagnation;  bacterial proliferation;  metabolic activity;  structural equation
Abstract:
This paper systematically investigated the deterioration of overnight water quality in indoor drinking water pipelines. From June to August, the monthly testing of fresh and stagnant water in indoor drinking water pipes was conducted, and the cell count and biological activity of bacteria were analyzed using flow cytometry and adenosine triphosphate (ATP). The risk of drinking water safety escalated after overnight stagnation. The residual chlorine in drinking water decreased significantly following stagnation. In June, July, and August, the nitrite nitrogen ranged from 0 mg/L to 0.006 mg/L, 0 mg/L to 0.009 mg/L, and 0 mg/L to 0.012 mg/L, respectively. In comparison to fresh water, the concentration of Fe in stagnant water increased by 1.33 times, 1.63 times and 6.00 times in June, July, and August respectively. Following stagnation, there was a significant increase in cell count and ATP concentration. The bacterial cell counts in stagnant water were 1.41×105 cells/mL, 1.23×105 cells/mL and 2.82×105 cells/mL, respectively. The total ATP concentration of bacteria and their intracellular ATP concentration were 7.97×10-12 g/mL, 3.91×10-12 g/mL, 12.80×10-12 g/mL and 7.15×10-17 g/cell, 4.74×10-17 g/cell, 4.48×10-17 g/cell, respectively. The structural equation model analysis revealed a significant positive correlation between temperature and the abundance and activity of bacteria in both stagnant water and fresh water. After stagnation, the relationship between Fe and bacterial cell counts shifted from negative to positive, while the positive correlation between bacterial cell counts and bacterial activity was attenuated.
Last Update: 2024-06-01