Wittmer A, Heisele A, McArdell C S, Böhler M, Longree P, Siegrist H
Swiss Federal Institute of Aquatic Science and Technology (Eawag), Überlandstrasse 133, CH-8600 Dübendorf, Switzerland E-mail:
Water Sci Technol. 2015;71(7):980-5. doi: 10.2166/wst.2015.053.
Ozone transforms various organic compounds that absorb light within the UV and visible spectra. UV absorbance can therefore be used to detect the transformation of chemicals during ozonation. In wastewater, decolourisation can be observed after ozonation. This study investigates the correlation of the UV absorbance difference between the ozonation inlet and outlet and the removal efficiency of micropollutants in wastewater. The absorbance at 254 and 366 nm was measured at the ozonation inlet and outlet, as was the concentration of 24 representative micropollutants and the dissolved organic carbon (DOC). The results clearly showed that the relative decrease of absorbance (ΔAbs) is positively correlated with the relative removal efficiency of micropollutants. We therefore suggest that UV absorbance can be used as a feedback control parameter to achieve optimal ozone dosage in wastewater treatment plants and to gain a fast insight into the process efficiency and stability of the ozonation.
臭氧能转化各种在紫外光谱和可见光谱范围内吸收光的有机化合物。因此，紫外线吸光度可用于检测臭氧化过程中化学物质的转化。在废水中，臭氧化后可观察到脱色现象。本研究调查了臭氧化进出口之间紫外线吸光度差异与废水中微量污染物去除效率的相关性。在臭氧化进出口处测量了254和366纳米处的吸光度，以及24种代表性微量污染物和溶解有机碳（DOC）的浓度。结果清楚地表明，吸光度的相对降低（ΔAbs）与微量污染物的相对去除效率呈正相关。因此，我们建议紫外线吸光度可作为反馈控制参数，以实现污水处理厂的最佳臭氧投加量，并快速了解臭氧化过程的效率和稳定性。
