污水中 δ34S 变化规律研究及其在管网诊断中的应用

本文针对研究区域内不同用水行为下及排水片区末端的污水中 δ34S 的变化规律开展了实验研究。得出以下结论：

(1) 根据不同用水行为下 δ34S 变化规律分析，除餐厨行为引起了 64.69% 的增幅外，洗漱、淋浴、舆洗室及餐具清洗行为下 δ34S 相对于自来水的变化比例均值范围为 -14.37% ~ 5.62%。故 δ34S 在整体范围上受不同用水行为影响较小，其在各类用水行为下指标稳定性较好。

(2) 根据排水片区末端的污水中 δ34S 的变化规律分析，δ34S 在排水片区末端污水中其相对自来水本底水平波动幅度较小，其相对于自来水的变化比例均值为 25.99%。δ34S 随时间的变化幅度整体较小且趋势稳定，每日波动变化规律具有一定的重现性。

(3) 分别结合不确定度评价，δ34S 在排水户的不同用水行为下及排水片区末端污水中具有良好的稳定性，因此 δ34S 适合作为一种水质特征因子应用于管网诊断。

This article presents an experimental study on the variation of δ34S in sewage at the end of drainage areas under different water use behaviors. The following conclusions were drawn:

(1) Based on the analysis of the variation of δ34S under different water use behaviors, except for the kitchen behavior that caused a 64.69% increase, the relative change of δ34S compared to tap water under washing, showering, toilet flushing, and tableware cleaning behaviors was in the range of -14.37% to 5.62%. Therefore, δ34S is less affected by different water use behaviors in the overall range, and its stability is good under various water use behaviors.

(2) Based on the analysis of the variation of δ34S in sewage at the end of drainage areas, the fluctuation amplitude of δ34S in sewage at the end of drainage areas relative to the baseline level of tap water is small, and its relative change compared to tap water has an average value of 25.99%. The variation of δ34S with time is small and stable, and the daily fluctuation pattern has a certain reproducibility.

(3) Combining with uncertainty evaluation, δ34S has good stability under different water use behaviors of drainage households and in sewage at the end of drainage areas. Therefore, δ34S is suitable as a water quality characteristic factor for pipeline diagnosis.