回用水消毒余氯衰减影响因素及数学拟合

 采用序批试验对污水厂二级出水氯消毒的氯衰减过程进行了研究。分析了TOC、pH、投量等在回用水消毒过程中对余氯衰减曲线的影响。通过对比一级、二级、平行一级、多项式等几种常用拟合模型，发现在回用水消毒中，氯和氯胺消毒衰减曲线分别遵循平行一级和多项式模型。TOC值升高、pH值降低、投量越大余氯衰减速度越快。

Influencing Factors of Residual Chlorine Decay Curve and Its Mathematical Model

Residual available chlorine curve and its modeling are essential for researches on disinfection of recycling wastewater and dosing control in practice. Batch tests were conducted to investigate the decay of chlorine in the disinfection of secondary effluent from wastewater treatment plants. The influence of some major parameters such as TOC, dosage and pH on the decay curve of free chlorine and chloramines was evaluated. The first order, second order, parallel first order and polynomial order were used to simulate the decay curves for comparison. It was found that decay curves of chlorine and chloramines in recycled wastewater followed the parallel first order and polynomial models. High TOC, low pH and/or high dosage of chlorine increased the decay rate of chlorine.