SONGXin,LIWei-ying,WANGYue,et al.Impacts of Ozone-Biological Activated Carbon Process on Physicochemical Properties of Drinking Water Distribution Networks[J].China Water & Wastewater,2025,41(13):79-86.
臭氧/生物活性炭工艺对供水管网理化性质的影响
- Title:
- Impacts of Ozone-Biological Activated Carbon Process on Physicochemical Properties of Drinking Water Distribution Networks
- 关键词:
- 臭氧/生物活性炭工艺; 供水管网; 水质; 管壁; 生物膜
- Keywords:
- ozone-biological active carbon process; drinking water distribution network; water quality; pipe wall; biofilm
- 摘要:
- 基于南方某城市实际供水管网，采用臭氧/生物活性炭（O3-BAC）和传统净水工艺（TT）供水，探究O3-BAC工艺对管网水、管壁生物膜的影响。当采用O3-BAC供水时，管网水的TOC、Fe和Mn浓度分别为（1.14±0.21） mg/L、（24.28±20.43） μg/L、（3.48±3.21） μg/L；而采用传统净水工艺供水时管网水上述指标分别为（1.47±0.24） mg/L、（64.24±97.29） μg/L、（7.18±6.78） μg/L，可见前者的水质更优。但对管壁生物膜的分析结果表明，采用O3-BAC供水时生物膜的污染物含量更高，其中TOC、Fe、硝酸盐含量分别为（21.57±8.26）、（351.37±169.92）、（3.33±3.45） mg/cm2，这种差异可能是由于管壁生物膜的TOC组分含有较多的酚类化合物，可沉积管网水中的金属离子，导致管壁聚集了更多污染物。同时，通过菌属群落分析也发现，硝酸盐代谢菌属主导管壁生物膜，丰度分别为22.5%（O3-BAC）、53.7%（TT），表明采用O3-BAC供水的管壁生物膜有较高的异养代谢能力，可加速管壁腐蚀过程。
- Abstract:
- Ozone-biological activated carbon (O3-BAC) and traditional treatment process were employed in an actual drinking water distribution network of a southern city. The impacts of the O3-BAC on drinking water quality within the network and the biofilm formation on the pipe walls were investigated. The TOC, Fe, and Mn in the O3-BAC-treated water within the pipe network were (1.14±0.21) mg/L, (24.28±20.43) μg/L, and (3.48±3.21) μg/L, respectively. Following traditional treatment process, the corresponding values increased to (1.47±0.24) mg/L, (64.24±97.29) μg/L, and (7.18±6.78) μg/L, respectively. These results indicate that the water quality of O3-BAC-treated water in the pipe network is superior compared to that after traditional treatment process treatment. However, the analysis of the biofilm on the pipe wall revealed that the pollutant contents in the O3-BAC biofilm were higher. Specifically, the TOC, Fe, and nitrate were (21.57±8.26) mg/cm3, (351.37±169.92) mg/cm2, and (3.33±3.45) mg/cm2, respectively. This discrepancy may be attributed to the fact that the TOC fraction of the O3-BAC biofilm on the pipe wall contains a higher proportion of phenolic compounds. These compounds can facilitate the deposition of metal ions in the pipe network water, leading to the accumulation of more pollutants on the pipe wall. Meanwhile, the analysis of bacterial genus communities indicated that nitrate metabolism bacteria were predominant in the biofilm on the pipe wall, accounting for relative abundance of 22.5% (O3-BAC) and 53.7% (traditional treatment process), respectively. This suggests that the O3-BAC biofilm on the pipe wall exhibits a high heterotrophic metabolic capacity, which may expedite the corrosion process of the pipe wall.
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