The feasibility of dissolved air flotation (DAF) for water treatment is frequently assessed by bench-scale tests using commercially available 1–2 L volume DAF jar test apparatuses. However, they can over-predict or under-predict turbidity removal. It is hypothesized that, similar to flocculent settling tests, larger diameter vessels will improve the DAF batch test predictions. Thus, the main objective of this research was to develop and test a larger diameter/larger volume (∼21 L) batch bench-scale DAF system (LB-DAF). A sensitivity analysis of the impact of the LB-DAF saturator pressure (SP), recycle ratio (RR), water depth to tank diameter ratio (D/W), impeller type and velocity gradients (G) was conducted to identify the values that yielded the best simulations of a full-scale DAF system. For the low turbidity, high organics river water tested, the LB-DAF system simulated the full-scale DAF turbidity removal much better than the DAF jar tests. This was in part due to the LB-DAF tank's saturated water delivery system and its larger vessel diameter. The values of the LB-DAF design/operational parameters had a relatively small impact on turbidity and natural organic matter (NOM) removals, so there was no single optimal set of LB-DAF operating conditions. NOM removal in the LB-DAF, the DAF jar and the full-scale DAF systems was very similar.

中文翻译：

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大批量台式溶解气浮系统（LB-DAF）用于饮用水可处理性测试

溶解气浮法（DAF）用于水处理的可行性经常通过使用商用的1-2 L容积DAF广口瓶测试设备的台式测试来评估。但是，它们可能会高估或低估浊度的去除。据推测，类似于絮凝沉降试验，较大直径的容器将改善DAF批试验的预测。因此，本研究的主要目的是开发和测试更大直径/更大体积（约21 L）的批量台式DAF系统（LB-DAF）。对LB-DAF饱和器压力（SP），循环比（RR），水深与水箱直径之比（D / W），叶轮类型和速度梯度（G）进行了研究，以确定可对全尺寸DAF系统进行最佳模拟的值。对于低浊度，高有机物河水测试，LB-DAF系统模拟了全尺寸DAF浊度去除效果，远优于DAF广口瓶测试。部分原因是LB-DAF储罐的饱和水输送系统及其较大的容器直径。LB-DAF设计/运行参数的值对浊度和天然有机物（NOM）去除的影响相对较小，因此没有LB-DAF运行条件的最佳组。LB-DAF，DAF广口瓶和全尺寸DAF系统中的NOM去除非常相似。