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Phosphorus limitation on bacterial regrowth in drinking water
Jun-qiang Sang1, Xi-hui Zhang, Guo-zhong Yu
1Research Center for Environmental Engineering and Management, Shenzhen Graduate School, Tsinghua University, Shenzhen 518057, China. zhlysjq@netease.com
Journal of Environmental Sciences (China)
|February 5, 2004
Summary
Phosphorus addition significantly increased bacterial regrowth potential in drinking water, indicating phosphorus limitation. Removing phosphorus could be a strategy to control microbial growth in water distribution systems.
Area of Science:
- Environmental Science
- Microbiology
- Water Treatment
Background:
- Microbial regrowth in drinking water poses a public health concern.
- Biological stability of drinking water is crucial for safe consumption.
- Nutrient availability, such as phosphorus, can influence bacterial proliferation.
Purpose of the Study:
- To investigate the impact of phosphorus on bacterial regrowth in drinking water.
- To determine if phosphorus is a limiting nutrient for bacterial growth in this water source.
- To explore phosphorus removal as a method for controlling microbial regrowth in distribution systems.
Main Methods:
- Assimilable Organic Carbon (AOC) testing was employed to quantify available nutrients.
- Bacterial Regrowth Potential (BRP) analysis was conducted to assess microbial proliferation.
- Controlled experiments involved adding phosphate to drinking water samples.
Main Results:
- Adding 50 microg/L PO4(3-)-P increased AOC by 43.9%-59.6%.
- Bacterial Regrowth Potential (BRP) increased significantly by 100%-235% upon phosphate addition.
- Results demonstrated a clear phosphorus limitation on bacterial regrowth.
Conclusions:
- Phosphorus plays a critical role in maintaining the biological stability of drinking water.
- Efficient phosphorus removal from drinking water is a potential strategy to mitigate microbial regrowth.
- This study offers insights for managing microbial populations in drinking water distribution systems in China.