DAIXue-ning,LIWei-ying,LIYue,et al.Comparison of Drinking Water Quality Chemical Stability between a Northern City and a Southern City in China[J].China Water & Wastewater,2023,39(1):39-44.
Click Copy

Comparison of Drinking Water Quality Chemical Stability between a Northern City and a Southern City in China

China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU] volume: 第39卷 Number: 第1期 Page: 39-44 Column: Date of publication: 2023-01-01
Author(s):
DAI　Xue-ning1;  LI　Wei-ying1; 2;  LI　Yue1;  LIANG　Li1;  ZHANG　Ya-mei1;  ZHANG　Wei3
（1. College of Environmental Science and Engineering， Tongji University， Shanghai 200092， China； 2. College of River and Ocean Engineering， Chongqing Jiaotong University， Chongqing 400074， China； 3. Chengdu Chuanli Intelligence Fluid Equipment Co. Ltd.， Chengdu 611530， China）
Keywords:
water supply system;  chemical stability;  Langelier saturation index;  Ryznar stability index;  erosion index;  Larson ratio
Abstract:
The chemical stability of water quality is one of the most important indicators to characterize the safety of drinking water. Based on the water quality monitoring data of product water and pipe network water from two Chinese cities (city A in the north and city B in the south) during the past 5 years (2013-2017), the Langelier saturation index (IL), Ryznar stability index (IR), erosion index (AI) and Larson ratio (LR) were used to comprehensively analyze the differences and similarities of water quality chemical stability between the two cities. The water quality chemical stability of drinking water from the north and south water supply systems was correlated with conventional water quality indicators such as water temperature, pH and total hardness. In city A, the values of IL and IR were in the range of -0.47-0.97 and 6.26-8.33, respectively. The water quality in spring and summer was chemically stable or showed a tendency of scaling, while the water quality in autumn and winter was mildly corrosive. In city B, the value of IL was between -2.89 and -1.99, and that of IR was between 10.96 and 12.34, suggesting that the water quality showed a tendency of serious corrosion throughout the year. The values of AI and LR further indicated that the water quality of the two cities was erosive and corrosive for both asbestos- cement pipe and metal pipe. Therefore, controlling the chemical stability of water quality in water supply systems can effectively guarantee the safety of water supply.
Last Update: 2023-01-01