Stormwater quality management has become an increasingly important topic. Pollutants from construction, urban, and agricultural runoff sources create adverse water quality impacts to receiving water bodies. Among these sources, suspended sediment has a significant influence on water quality and further acts as a media for transporting pollutants. Current stormwater treatment practices remove large, rapidly settable, soil particles; however, fine soil particles tend to remain suspended and contribute to elevated turbidity conditions. A need exists for an economical and passive treatment mechanism for the removal of suspended solids. Lamella settlers have been shown to enhance soil particle capture by increasing surface area and reducing settling distance. The objective of this research was to identify and optimize design configurations for a lamella settler system in treating a variety of synthetic soils. Five types of synthetic soils suspended in simulated stormwater at 500, 1000, and 5000 mg/L concentration were treated using system configurations of three lamella settler reactors at 0.5, 1.0, and 1.5-h residence times. Statistical analyses through a full factorial method followed with a regression analysis and analysis of variance (ANOVA) test suggested that there was a significant difference exists between these experimental variables and turbidity levels. An optimized lamella settler reactor providing 1.8 cm (0.7 in.) settling space with 1.5-h residence time reduced turbidity by up to 90% when compared to a control reactor without lamella plates and a 0.5-h residence time. In addition, particle size distribution analysis indicated a decrease in the D90 by up to 84%, which showed that the optimized reactor was effective in capturing larger diameter soil particles.

中文翻译：

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薄片沉降器处理悬浮沉积物的评价

雨水水质管理已成为越来越重要的课题。来自建筑、城市和农业径流源的污染物对受纳水体造成不利的水质影响。在这些来源中，悬浮泥沙对水质有显着影响，并进一步充当污染物的输送介质。目前的雨水处理方法去除大的、可快速固化的土壤颗粒；然而，细小的土壤颗粒往往会保持悬浮状态并导致浊度升高。需要一种用于去除悬浮固体的经济且被动的处理机制。薄片沉降器已被证明可以通过增加表面积和减少沉降距离来增强土壤颗粒捕获。本研究的目的是确定和优化用于处理各种合成土壤的薄片沉降器系统的设计配置。使用三个薄片沉降反应器的系统配置以 0.5、1.0 和 1.5 小时的停留时间处理悬浮在模拟雨水中的五种类型的合成土壤，浓度为 500、1000 和 5000 毫克/升。通过全因子方法进行的统计分析以及回归分析和方差分析 (ANOVA) 测试表明这些实验变量和浊度水平之间存在显着差异。与没有薄片板和 0.5 小时停留时间的对照反应器相比，提供 1.8 厘米（0.7 英寸）沉降空间和 1.5 小时停留时间的优化薄片沉降反应器可将浊度降低多达 90%。此外，