Hou Rui, Jin Xin, Jin Peng-Kang, Gou Bang-Yao, Wang Xiao-Chang
School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China.
Xi'an Lingbo Environmental Engineering Co., Ltd., Xi'an 710100, China.
Huan Jing Ke Xue. 2018 Feb 8;39(2):844-851. doi: 10.13227/j.hjkx.201706076.
The aim of this study was to investigate the effectiveness of ozonation on the removal of organic matter with low coagulability from municipal secondary effluent. The results revealed that the removal efficiency of coagulation generally remained quite low. The residual organic matter belonged to low coagulability organic matter. The presence of the ozone increased the removal efficiency of color and UV gradually for low coagulability organic matter, whereas DOC had no noticeable change; the efficiencies were 45%, 34%, and 20%, respectively, at a dosage (denoted as O/DOC) of 1.5 mg·mg. It could be concluded that ozone easily reacted with unsaturated organic matter, and the mineralization of organic matter was less effective. In order to further define the variation in organic matter of the secondary effluent, the differences between the relative molecular weight distribution and fluorescence characteristics of coagulation and ozonation with different zone dosages were monitored in this study. The findings showed that coagulation had little effect on organic content. Nonetheless, ozone might have preferentially reacted with high-molecular-weight substances of organic matter with low coagulability and reduced the fluorescence intensity in the humic-like regions significantly. The shift of fluorescence peak was not changed by ozonation. In addition, via X-ray photoelectron spectroscopy (XPS) analysis, it was identified that coagulation could remove carboxylic organic matter. On the other hand, with the increasing ozone dosage (from 0 to 1.5 mg·mg), ozone could preferentially react with low coagulability organic matter with aromatic structure, thus the amount of aliphatics increased gradually.
本研究的目的是调查臭氧化对去除城市二级出水中低凝聚性有机物的有效性。结果表明，混凝的去除效率总体上仍然很低。残留有机物属于低凝聚性有机物。臭氧的存在使低凝聚性有机物的颜色和紫外线去除效率逐渐提高，而溶解性有机碳（DOC）没有明显变化；在臭氧投加量（以O/DOC表示）为1.5毫克/毫克时，去除效率分别为45%、34%和20%。可以得出结论，臭氧很容易与不饱和有机物发生反应，而有机物的矿化效果较差。为了进一步明确二级出水有机物的变化情况，本研究监测了不同臭氧投加量下混凝和臭氧化过程中相对分子质量分布及荧光特性的差异。结果表明，混凝对有机物含量影响很小。然而，臭氧可能优先与低凝聚性有机物中的高分子量物质发生反应，并显著降低类腐殖质区域的荧光强度。臭氧化并未改变荧光峰的位置。此外，通过X射线光电子能谱（XPS）分析发现，混凝可以去除羧酸类有机物。另一方面，随着臭氧投加量的增加（从0到1.5毫克/毫克），臭氧可以优先与具有芳香结构的低凝聚性有机物发生反应，从而使脂肪族物质的含量逐渐增加。
