Department of Soil Conservation, University of Calabria (Italy), 87036 Rende CS, Italy.
Water Sci Technol. 2010;61(1):135-43. doi: 10.2166/wst.2010.805.
This paper examines an urbanized catchment in Cosenza, Italy where an off-line basin intercepting CSOs was studied to illustrate reduction in CSO discharges to the Crati River. While the hydrologic transport of pollutant mass is never known a-priori and can be flow-limited, the volumetric requirements of the basin were modeled based on the classic assumption that wet weather flows transport urban and sewer loads in a mass-limited (first-flush) delivery. The volumetric capacity of the basin was varied from 10 to 50 m(3)/ha. Operational basin control was simulated with historical datasets from the Liguori catchment, event-based loading data, and continuous simulation modelling with SWMM. Utilizing data from the catchment, the SWMM simulations were conducted considering the storage basin with or without sedimentation treatment. Results illustrate the potential benefits of the off-line operation for the system with respect to the volume and mass reduction of CSOs into the Crati River. Results demonstrate the importance of particle size distribution (PSD) as an index of basin efficiency, coupled with analysis of the hydrodynamic response of the basin. The basin model attenuated influent PSDs, separating the coarser fraction of the PSD, and reduced the load of influent particulate matter (PM).
本文研究了意大利科森扎的一个城市化流域，其中研究了一个离线流域拦截点来减少向克拉蒂河排放的城市污水。虽然污染物质量的水文传输事先是未知的，并且可能受到流量限制，但根据经典假设，流域的体积要求是基于在质量限制（初雨）输送的情况下，雨水流量输送城市和污水负荷。流域的体积容量从 10 到 50 立方米/公顷不等。利用 Liguori 流域的历史数据集、基于事件的加载数据和 SWMM 的连续模拟建模，对流域的运行控制进行了模拟。利用流域数据，对考虑或不考虑沉淀处理的储水池进行了 SWMM 模拟。结果表明，对于系统而言，离线运行对于减少进入克拉蒂河的污水量和质量具有潜在的好处。结果表明，颗粒尺寸分布（PSD）作为流域效率的指标的重要性，以及对流域水动力响应的分析。该流域模型衰减了进水 PSD，分离了 PSD 的较粗部分，并减少了进水颗粒物（PM）的负荷。
