污水中δ34S变化规律研究：应用于外水入侵比例测算

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变化比例均值为25.99%，具有一定的波动幅度。

(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。

因此在量化分析入渗入流时，δ34S可适合一个新的指标因子用于辅助δ18O和δ2H进行外水入侵比例的测算。以达到测算结果综合稳定的目的。

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

(1) According to the analysis of the variation of δ34S under different water use behaviors, except for the 64.69% increase caused by kitchen behavior, the relative change of δ34S compared to tap water under washing, showering, toilet flushing, and dishwashing behaviors ranged from -14.37% to 5.62% on average. 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) According to the analysis of the variation of δ34S in sewage at the end of drainage areas, the average relative change of δ34S in sewage at the end of drainage areas compared to the background level of tap water was 25.99%, with a certain fluctuation range.

(3) Combining uncertainty evaluation, δ34S has good stability under different water use behaviors of drainage households and in sewage at the end of drainage areas.

Therefore, when quantitatively analyzing infiltration inflow, δ34S can be used as a new index factor to assist δ18O and δ2H in calculating the proportion of external water intrusion, in order to achieve comprehensive and stable calculation results.