Effective advance treatment of secondary effluent from industrial parks by the Mn-based catalyst ozonation process

IF 6.1 2区 环境科学与生态学 Q2 ENGINEERING, ENVIRONMENTAL Frontiers of Environmental Science & Engineering Pub Date : 2024-07-17 DOI:10.1007/s11783-024-1884-4
Zhijuan Niu, Shihao Han, Weihua Qin, Pan Gao, Feng Xiao, Shaoxia Yang
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Abstract

Catalytic ozonation is a potential technology to eliminate refractory organic contaminants with the low concentration in secondary effluent from industrial park wastewater treatment plants (IPWWTPs). In this study, the catalytic ozonation over the Mn-based catalyst significantly improved the chemical oxygen demand (COD), total organic carbon (TOC), and UV254 removals of secondary effluent from IPWWTPs. The Mn-based catalyst/O3 system achieved 84.8%, 69.8%, and 86.4% removals of COD, TOC, and UV254, which were 3.3, 5.7, and 1.1 times that in ozonation alone, respectively. Moreover, the Mn-based catalytic ozonation process exhibited excellent pH tolerance ranging from pH 4.0 to 9.0. Additionally, the depth analysis based on fluorescence excitation-emission matrix (EEM) confirmed that the catalytic ozonation process preferred to degrade toxic aromatic hydrocarbons. The existence of the Mn-based catalyst/O3 system enhanced 21.4%–38.3% more fluorescent organic matters removal, compared to that in ozonation alone. Mechanistic studies proved that the abundant Lewis acid sites (Mnn+/Mn(n+1)+ and adsorbed oxygen) on the surface of the Mn-based catalyst effectively promoted O3 decomposition into reactive oxygen species (ROS), and ·O2/HO2· and 1O2 were the main ROS for degrading refractory organic contaminants. The contributions of ROS oxidation (91.2%) was much higher than that of direct O3 oxidation (8.8%). Thus, this work provides an effective advanced treatment process for purifying secondary effluent from IPWWTPs.

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利用锰基催化剂臭氧工艺对工业园区二级污水进行有效的预处理
催化臭氧是一种消除工业园区污水处理厂(IPWWTP)二级出水中低浓度难处理有机污染物的潜在技术。在这项研究中,在锰基催化剂上进行催化臭氧处理可显著提高工业园区污水处理厂二级出水中化学需氧量(COD)、总有机碳(TOC)和紫外线 254 的去除率。锰基催化剂/O3 系统对 COD、TOC 和 UV254 的去除率分别达到 84.8%、69.8% 和 86.4%,分别是单独臭氧处理的 3.3 倍、5.7 倍和 1.1 倍。此外,基于锰的催化臭氧工艺在 pH 值为 4.0 至 9.0 的范围内表现出卓越的 pH 值耐受性。此外,基于荧光激发-发射矩阵(EEM)的深度分析证实,催化臭氧过程更倾向于降解有毒的芳香烃。与单独臭氧处理相比,锰基催化剂/O3 系统对荧光有机物的去除率提高了 21.4%-38.3%。机理研究证明,锰基催化剂表面丰富的路易斯酸位点(Mnn+/Mn(n+1)+ 和吸附氧)有效地促进了 O3 分解为活性氧(ROS),-O2-/HO2- 和 1O2 是降解难降解有机污染物的主要 ROS。ROS 氧化的贡献率(91.2%)远远高于 O3 直接氧化的贡献率(8.8%)。因此,这项工作为净化 IPWWTP 的二级污水提供了一种有效的先进处理工艺。
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来源期刊
Frontiers of Environmental Science & Engineering
Frontiers of Environmental Science & Engineering ENGINEERING, ENVIRONMENTAL-ENVIRONMENTAL SCIENCES
CiteScore
10.90
自引率
12.50%
发文量
988
审稿时长
6.1 months
期刊介绍: Frontiers of Environmental Science & Engineering (FESE) is an international journal for researchers interested in a wide range of environmental disciplines. The journal''s aim is to advance and disseminate knowledge in all main branches of environmental science & engineering. The journal emphasizes papers in developing fields, as well as papers showing the interaction between environmental disciplines and other disciplines. FESE is a bi-monthly journal. Its peer-reviewed contents consist of a broad blend of reviews, research papers, policy analyses, short communications, and opinions. Nonscheduled “special issue” and "hot topic", including a review article followed by a couple of related research articles, are organized to publish novel contributions and breaking results on all aspects of environmental field.
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