TU Wien, Institute for Water Quality and Resource Management, Karlsplatz 13/226-1, 1040 Vienna, Austria; Faculty of Environment and Natural Resources, Ho Chi Minh City University of Technology (HCMUT), 268 Ly Thuong Kiet Street, District 10, Ho Chi Minh City, Viet Nam; Viet Nam National University Ho Chi Minh City, Linh Trung Ward, Thu Duc City, Ho Chi Minh City, Viet Nam.
TU Wien, Institute for Water Quality and Resource Management, Karlsplatz 13/226-1, 1040 Vienna, Austria.
Sci Total Environ. 2022 Mar 15;812:152466. doi: 10.1016/j.scitotenv.2021.152466. Epub 2021 Dec 21.
The present work aimed to study the effect of ozonation on the organic sum parameters linked to enhanced biodegradability. Laboratory experiments were conducted with the effluent of four Austrian urban wastewater treatment plants with low food to microorganism ratios and different matrix characteristics. Biochemical oxygen demand over 5 days (BOD) was measured before ozonation and after application of different specific ozone doses (D) (0.4, 0.6 and 0.8 g O/g DOC). Other investigated organic parameters comprised chemical oxygen demand (COD), dissolved organic carbon (DOC), UV absorption at 254 nm (UV), which are parameters that are applied in routine wastewater analysis. Carbamazepine and benzotriazole were measured as reference micropollutants. The results showed a dose-dependent increase in biological activity after ozonation; this increase was linked to the enhanced biodegradability of substances that are recalcitrant to biodegradation in conventional activated sludge treatment. The highest relative change was determined for BOD, which already occurred between 0 and 0.4 g O/g DOC for all samples. Increasing the D to 0.6 and 0.8 g O/g DOC resulted in a less pronounced increase. DOC was not substantially decreased after ozonation, which was consistent with a low reported degree of mineralization, while partial oxidation led to a quantifiable decrease in COD (7 to 17%). Delta UV and the decline in specific UV absorption after ozonation clearly correlated with D. In contrast, for COD and biodegradable DOC (BDOC), a clear dose-response pattern was identified only after exposure to BOD measurement. Indications for improved biodegradability were further supported by the rise in the BOD/COD ratio. The results indicated that subsequent biological processes have a higher degradation potential after ozonation. The further reduction in biodegradable organic carbon emission by the combination of ozonation and biological post treatment represents another step towards sustainable water resource management in addition to micropollutant abatement.
本研究旨在探讨臭氧氧化对增强可生物降解性相关有机综合参数的影响。实验采用了来自奥地利 4 家城市污水处理厂的出水，这些处理厂的食物与微生物比例较低，基质特性也不同。在臭氧氧化前后，分别测量了生化需氧量（BOD）5 天（BOD），并施加了不同的特定臭氧剂量（D）（0.4、0.6 和 0.8 g O/g DOC）。其他研究的有机参数包括化学需氧量（COD）、溶解有机碳（DOC）、254nm 处的紫外吸收（UV），这些参数应用于常规废水分析。卡马西平（carbamazepine）和苯并三唑（benzotriazole）被用作参考微量污染物。结果表明，臭氧氧化后生物活性呈剂量依赖性增加；这种增加与常规活性污泥处理中难以生物降解的物质的可增强生物降解性有关。BOD 的相对变化最大，所有样品在 0 到 0.4 g O/g DOC 之间已经发生。将 D 增加到 0.6 和 0.8 g O/g DOC 会导致增加不那么明显。臭氧氧化后 DOC 没有明显减少，这与报告的低矿化度一致，而部分氧化导致 COD 可量化减少（7-17%）。臭氧氧化后 Delta UV 和特定紫外吸收的下降与 D 明显相关。相比之下，只有在接触 BOD 测量后，COD 和可生物降解的 DOC（BDOC）才表现出明显的剂量反应模式。BOD/COD 比值的增加进一步支持了可生物降解性提高的迹象。结果表明，臭氧氧化后后续生物过程具有更高的降解潜力。除了减少微量污染物外，臭氧氧化与生物后处理相结合，进一步减少可生物降解有机碳的排放，是实现可持续水资源管理的又一步。
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