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DOM removal is more important than the specific DOM removal pretreatment process for GAC adsorption of TrOCs
Environmental Science: Water Research & Technology ( IF 3.5 ) Pub Date : 2021-08-31 , DOI: 10.1039/d1ew00375e Anthony Kennedy 1 , Janet Hausmann 2 , Christopher Corwin 1 , R. Scott Summers 3
Environmental Science: Water Research & Technology ( IF 3.5 ) Pub Date : 2021-08-31 , DOI: 10.1039/d1ew00375e Anthony Kennedy 1 , Janet Hausmann 2 , Christopher Corwin 1 , R. Scott Summers 3
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Granular activated carbon (GAC) is an effective treatment technology for removing dissolved organic matter (DOM) and trace organic contaminants (TrOCs) from drinking water. However, higher DOM concentrations lead to earlier TrOC breakthrough because of competitive adsorption between them. As such, it is imperative to select an appropriate DOM removal pretreatment process. This study investigated the impact of three DOM removal pretreatment processes on the breakthrough of 29 TrOCs in a single raw water source by treating to the same average dissolved organic carbon (DOC) concentration of 2.1 to 2.2 mg L−1. The three pretreatment processes were (1) ozonation following by biofiltration and conventional treatment (O3/BF/C), (2) magnetic ion exchange following by conventional treatment (MIEX/C), and (3) conventional treatment alone (C). The effect of DOC concentration itself was also evaluated solely for O3/BF/C treated waters at average concentrations of 2.2, 2.9, and 3.8 mg L−1. Using GAC in rapid small-scale column tests, MIEX/C pretreatment resulted in DOM with the highest absorbability (latest breakthrough) followed by C then O3/BF/C. In terms of TrOC breakthrough, MIEX/C pretreatment resulted in earlier TrOC breakthrough at higher bed volumes but, on average, bed volumes to 10% TrOC breakthrough (BV10%,TrOC) were statistically the same between all pretreatments. Only the water with the highest DOC concentration, treated by O3/BF/C, resulted in lower BV10%,TrOC values on average. These results suggest that for high levels of TrOC removal by GAC, as defined by BV10%,TrOC values, influent DOC concentrations are more important than the specific DOM removal pretreatment process.
中文翻译：
对于 TrOCs 的 GAC 吸附，DOM 去除比特定的 DOM 去除预处理工艺更重要
颗粒活性炭 (GAC) 是去除饮用水中溶解有机物 (DOM) 和痕量有机污染物 (TrOCs) 的有效处理技术。然而，由于它们之间的竞争吸附，较高的 DOM 浓度导致较早的 TrOC 突破。因此，必须选择合适的 DOM 去除预处理工艺。本研究调查了三种 DOM 去除预处理工艺对单个原水源中 29 TrOC 穿透的影响，方法是将其处理为 2.1 至 2.2 mg L -1的相同平均溶解有机碳 (DOC) 浓度。三个预处理过程是（1）臭氧化，然后是生物过滤和常规处理（O 3/BF/C)，(2) 常规处理后的磁性离子交换 (MIEX/C)，和 (3) 单独的常规处理 (C)。还仅针对平均浓度为 2.2、2.9 和 3.8 mg L -1 的O 3 /BF/C 处理水评估了 DOC 浓度本身的影响。在快速小规模柱测试中使用 GAC，MIEX/C 预处理导致 DOM 具有最高的吸收性（最新突破），其次是 C，然后是 O 3 /BF/C。在 TrOC 突破方面，MIEX/C 预处理导致在较高床体积下更早的 TrOC 突破，但平均而言，所有预处理之间的10% TrOC 突破 (BV 10%,TrOC ) 的床体积在统计上是相同的。只有 DOC 浓度最高的水，经过 O 3处理/BF/C，导致 BV平均降低10%，TrOC值。这些结果表明，对于高水平的 GAC 去除 TrOC，如 BV 10%，TrOC值所定义，进水 DOC 浓度比特定的 DOM 去除预处理过程更重要。
更新日期：2021-08-31
中文翻译：
对于 TrOCs 的 GAC 吸附，DOM 去除比特定的 DOM 去除预处理工艺更重要
颗粒活性炭 (GAC) 是去除饮用水中溶解有机物 (DOM) 和痕量有机污染物 (TrOCs) 的有效处理技术。然而，由于它们之间的竞争吸附，较高的 DOM 浓度导致较早的 TrOC 突破。因此，必须选择合适的 DOM 去除预处理工艺。本研究调查了三种 DOM 去除预处理工艺对单个原水源中 29 TrOC 穿透的影响，方法是将其处理为 2.1 至 2.2 mg L -1的相同平均溶解有机碳 (DOC) 浓度。三个预处理过程是（1）臭氧化，然后是生物过滤和常规处理（O 3/BF/C)，(2) 常规处理后的磁性离子交换 (MIEX/C)，和 (3) 单独的常规处理 (C)。还仅针对平均浓度为 2.2、2.9 和 3.8 mg L -1 的O 3 /BF/C 处理水评估了 DOC 浓度本身的影响。在快速小规模柱测试中使用 GAC，MIEX/C 预处理导致 DOM 具有最高的吸收性（最新突破），其次是 C，然后是 O 3 /BF/C。在 TrOC 突破方面，MIEX/C 预处理导致在较高床体积下更早的 TrOC 突破，但平均而言，所有预处理之间的10% TrOC 突破 (BV 10%,TrOC ) 的床体积在统计上是相同的。只有 DOC 浓度最高的水，经过 O 3处理/BF/C，导致 BV平均降低10%，TrOC值。这些结果表明，对于高水平的 GAC 去除 TrOC，如 BV 10%，TrOC值所定义，进水 DOC 浓度比特定的 DOM 去除预处理过程更重要。
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