Background

Changing water quality was prevalent in the current water supply. The fluctuation of iron stability due to changing water quality followed four characteristics: objectivity, relativity, predictability, and controllability. Therefore, it was necessary to study the stability of iron in the pipe network by integrating different water quality factors.

Results

The iron stability risk evaluation system was established according to the different water quality factors in the drinking water distribution systems (DWDSs). Meanwhile, an improved fuzzy comprehensive evaluation method was established to evaluate the risk of iron. Chloride, sulfate, dissolved organic matter (DOM) and pH were selected as the risk assessment index. The divisions of different evaluation levels were carried out through the values of water quality factor. On the basis of expert scoring, the weight and membership degree of water quality factors were analyzed by structural entropy method. In addition, risk analysis was established by using the optimized risk assessment system. According to the results of the comprehensive evaluation, DOM and pH were identified as two of the most important factors in the evaluation of the iron stability. In addition, compared with the traditional fuzzy comprehensive evaluation method, the optimized method had a higher degree of fit which could more clearly prove the relationship between the risk value and the iron concentration.

Conclusion

The uncertainty between the factors was eliminated by establishment of the fuzzy evaluation method combined with the different effects of water factors on iron stability. The method could be used as a comprehensive evaluation and be beneficial to the analysis of iron risk in water supply network.

中文翻译：

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基于模糊综合评价的水质因素下铁稳定性的风险评估方法

背景

在当前的供水中，水质变化普遍。由于水质变化而引起的铁稳定性波动具有四个特征：客观性，相对性，可预测性和可控制性。因此，有必要通过综合考虑不同水质因素来研究管网中铁的稳定性。

结果

根据饮用水分配系统（DWDS）中不同的水质因素，建立了铁稳定性风险评估系统。同时，建立了一种改进的模糊综合评价方法，以评估铁的风险。选择氯化物，硫酸盐，溶解性有机物（DOM）和pH作为风险评估指标。通过水质因子的值进行不同评价等级的划分。在专家评分的基础上，采用结构熵法分析了水质因子的权重和隶属度。此外，通过使用优化的风险评估系统建立了风险分析。根据综合评估的结果，DOM和pH被确定为评估铁稳定性的两个最重要因素。

结论

通过建立模糊评估方法并结合水分因子对铁稳定性的不同影响，消除了因子之间的不确定性。该方法可作为综合评价方法，有利于分析供水管网中铁的风险。