School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an, Shaanxi Province, 710055, China.
School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an, Shaanxi Province, 710055, China.
J Hazard Mater. 2017 Apr 5;327:216-224. doi: 10.1016/j.jhazmat.2016.12.043. Epub 2016 Dec 26.
A novel hybrid ozonation-coagulation (HOC) process was developed for application in wastewater reclamation. In this process, ozonation and coagulation occurred simultaneously within a single unit. Compared with the conventional pre-ozonation-coagulation process, the HOC process exhibited much better performance in removing dissolved organic matters. In particular, the maximal organic matters removal efficiency was obtained at the ozone dosage of 1mgO/mg DOC at each pH value (pH 5, 7 and 9). In order to interpret the mechanism of the HOC process, ozone decomposition was monitored. The results indicated that ozone decomposed much faster in the HOC process. Moreover, by using the reagent of O-resistant hydroxyl radical (OH) probe compound, para-chlorobenzoic acid (pCBA), and electron paramagnetic resonance (EPR) analysis, it was observed that the HOC process generated higher content of OH compared with pre-ozonation process. This indicates that the OH oxidation reaction as the key step can be catalyzed and enhanced by Al-based coagulants and their hydrolyzed products in this developed process. Thus, based on the catalytic effects of Al-based coagulants on ozonation, the HOC process provides a promising alternative to the conventional technology for wastewater reclamation in terms of higher efficiency.
一种新型臭氧氧化-混凝（HOC）工艺被开发用于废水回用。在该工艺中，臭氧氧化和混凝在一个单元内同时发生。与传统的预臭氧化-混凝工艺相比，HOC 工艺在去除溶解有机物方面表现出更好的性能。特别是，在每个 pH 值（pH 5、7 和 9）下，臭氧剂量为 1mgO/mgDOC 时，获得了最大的有机物去除效率。为了解释 HOC 工艺的机理，监测了臭氧的分解。结果表明，HOC 工艺中臭氧分解速度更快。此外，通过使用耐臭氧羟基自由基（OH）探针化合物对氯苯甲酸（pCBA）和电子顺磁共振（EPR）分析，观察到 HOC 工艺产生的 OH 含量高于预臭氧化工艺。这表明 OH 氧化反应作为关键步骤，可以被 Al 基混凝剂及其水解产物在该开发工艺中催化和增强。因此，基于 Al 基混凝剂对臭氧的催化作用，HOC 工艺在提高效率方面为废水回用的传统技术提供了一种有前途的替代方法。
