This work analysed the hydraulic behaviour and treatment efficiency of an upflow baffled septic tank (UBST) through tracer tests and mathematical modelling using the axial dispersion and the tank-in-series (TIS) models. The tracer tests were performed under different HRTs (12, 18 and 24 h) and configurations (UBST, UBST with sludge and UBST with sludge and zeolite filter). UBST followed a non-ideal flow, and configuration modifications, rather than HRT, altered its hydraulic behaviour. Mathematical modelling indicated that the TIS model calculated with mean squared error (φ) described adequately UBST hydraulic behaviour (R² = 0.9833). Additionally, UBST is recommended to operate under 24 h HRT to reach satisfactory hydraulic and pollutant removal efficiencies. At this HRT, total COD and ammonium removals were 75.1% and 49.3%, respectively, which were better than those obtained without the zeolite (71.2% and 1.8%, respectively). However, it quickly saturated, so it is necessary to deepen the research on this topic.

中文翻译：

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使用示踪剂测试和数学模型对填充沸石的上流挡板化粪池进行综合分析

这项工作通过示踪剂测试和使用轴向扩散和串联罐 (TIS) 模型的数学建模分析了上流挡板化粪池 (UBST) 的水力行为和处理效率。示踪剂测试在不同的 HRT（12、18 和 24 小时）和配置（UBST、带有污泥的 UBST 和带有污泥和沸石过滤器的 UBST）下进行。UBST 遵循非理想流量，并且配置修改而不是 HRT 改变了其水力行为。数学建模表明，用均方误差 ( φ ) 计算的 TIS 模型充分描述了 UBST 水力行为 ( R ² = 0.9833)。此外，建议 UBST 在 24 小时 HRT 下运行，以达到令人满意的水力和污染物去除效率。在此 HRT 下，总 COD 和铵的去除率分别为 75.1% 和 49.3%，优于未使用沸石的情况（分别为 71.2% 和 1.8%）。但是，它很快就饱和了，因此有必要深化对该主题的研究。