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ozonation of aromatic monomer compounds in water: factors determining reaction outcomes

Frontiers of Environmental Science & Engineering 2023年第5期17卷 13-25页

作者： Zhe Wang Wenjuan Zhang Zhiwei Wang Jing Chang School of Environmental Science and Safety Engineering Tianjin University of TechnologyTianjin 300384China School of Environmental and Municipal Engineering Tianjin Key Laboratory of Aquatic Science and TechnologyTianjin Chengjian UniversityTianjin 300384China Tianjin Municipal Engineering Design&Research Institute Co. Ltd.Tianjin 300384China

For aromatic monomer compounds (AMCs), ozonation outcomes were usually predicted by the substituents of the benzene ring based on the electron inductive effect. However, the predicted results were occasionally unreliable for complex substituents, and other factors caused concern. In this study, p-chloronitrobenzene (p-CNB) and ibuprofen (IBP) were selected for ozonation. According to the electron inductive theory, p-CNB should be less oxidizable, but the opposite was true. The higher rates of p-CNB were due to various sources of assistance. First, the hydroxyl radical (•OH) contributed 90 % to p-CNB removal at pH 7.0, while its contribution to IBP removal was 50 %. Other contributions came from molecular O3 oxidation. Second, p-CNB achieved 40 % of the total organic carbon (TOC) removal and fewer by-product types and quantities, when compared to the results for IBP. Third, the oxidation of p-CNB started with hydroxyl substitution reactions on the benzene ring;then, the ring opened. However, IBP was initially oxidized mainly on the butane branched chain, with a chain-shortening process occurring before the ring opened. Finally, the degradation pathway of p-CNB was single and consumed fewer oxidants. However, both branches of IBP were attacked simultaneously, and three degradation pathways that relied on more oxidants were proposed. All of these factors were determinants of the rapid removal of p-CNB.

关键词： ozonation Aromatic compound Oxidizing specie By-product Initial reaction position Degradation pathway

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ozonation of refractory chemicals in leachate with hydrogen peroxide

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Journal of Environmental Sciences 2002年第4期14卷 495-500页

作者： WANGPeng LAUWCIvan FANGHPHerbert DepartmentofEnvironmentalScienceandEngineering HarbinInstituteofTechnologyHarbin150001China DepartmentofCivilEngineering TheUniversityofHongKongHongKongSARChina

Nearly 97% of organic chemicals in Hong Kong leachate could be effectively removed by the UASB(upflow anaerobic sludge blanket) process followed by the fenton coagulation. The COD of leachate was lowered from an average of 12900 mg/L to 1440 mg/L after the UASB treatment, and was further lowered to 394 mg/L after the fenton coagulation. The remaining refractory residues could be further removed by ozonation with the addition of H 2O 2. The ozonation for the supernatant of the fenton coagulation was most effective at pH 7—8, with the addition of 300 mg/L of H 2O 2, and 30 min of reaction. The final effluent contained only 85 mg/L of COD and l0 mg/L of BOD 5. On the other hand, direct ozonation of UASB effluent lowered the COD to 905 mg/L and BOD 5 to l03 mg/L. ozonation improved the biodegradability of the organic residues, and also converted part of organic\|N in the leachate into NH 3 N and NO - 3\|N.

关键词： biodegradability fenton coagulation hydrogen peroxide leachate ozonation UASB

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Decomposition of alachlor by ozonation and its mechanism

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Journal of Environmental Sciences 2007年第7期19卷 769-775页

作者： LI Hai-yan QU Jiu-hui LIU Hui-juan School of Environment of Energy Engineering Beifing University of Civil Engineering and Architecture Beijing 100044 China. State Key Laboratory of Environmental Aquatic Chemistry Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Belting 100085 China.

Decomposition and corresponding mechanism of alachlor, an endocrine disruptor in water by ozonation were investigated. Results showed that alachlor could not be completely mineralized by ozone alone. Many intermediates and final products were formed during the process, including aromatic compounds, aliphatic carboxylic acids, and inorganic ions. In evoluting these products, some of them with weak polarity were qualitatively identified by GC-MS. The information of inorganic ions suggested that the dechlorination was the first and the fastest step in the ozonation of alachlor.

关键词： alachlor ozonation decomposition mechanism

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Significant increase of assimilable organic carbon(AOC)levels in MBR effluents followed by coagulation,ozonation and combined treatments:Implications for biostability control of reclaimed water

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Frontiers of Environmental Science & Engineering 2021年第4期15卷 241-249页

作者： Xiaojie Shi Zhuo Chen Yun Lu Qi Shi Yinhu Wu Hong-Ying Hu Environmental Simulation and Pollution Control State Key Joint Laboratory State Environmental Protection Key Laboratory of Microorganism Application and Risk Control(SMARC)School of EnvironmentTsinghua UniversityBeijing100084China Shenzhen Environmental Science and New Energy Technology Engineering Laboratory Tsinghua-Berkeley Shenzhen InstituteShenzhen518055China

As water reuse development has increased,biological stability issues associated with reclaimed water have gained *** study evaluated assimilable organic carbon(AOC)in effluents from a full-scale membrane biological reactor(MBR)plant and found that they were generally stable over one year(125-216µg/L),with slight increases in warmer *** additional tertiary treatments,the largest increases in absolute and specific AOCs were detected during ozonation,followed by coagulation-ozonation and ***,UV254 absorbance is known to be an effective surrogate to predict the AOC changes during *** coagulation prior to ozonation of MBR effluents for removal of large molecules was found to reduce the AOC formation compared with ozonation treatment ***,the results revealed that attention should be paid to seasonal variations in influent and organic fraction changes during treatment to enable sustainable water reuse.

关键词： Assimilable organic carbon(AOC) MBR effluents Tertiary treatments Coagulation ozonation

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Dendritic BiVO4 decorated with MnOx co-catalyst as an efficient hierarchical catalyst for photocatalytic ozonation

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Frontiers of Chemical Science and Engineering 2019年第1期13卷 185-191页

作者： Jin Yang Xuelian Liu Hongbin Cao Yanchun Shi Yongbing Xie Jiadong Xiao School of Chemical Engineering and Technology Tianjin University Tianjin 300072 China Beijing Engineering Research Center of Process Pollution Control CAS Key Laboratory of Green Process and Engineering Institute of Process Engineering Chinese Academy of Sciences Beijing 100190 China University of Chinese Academy of Sciences Beijing 100049 China

An appropriate co-catalyst can significantly promote the photocatalytic efficacy, but this has been seldom studied in the visible-light photocatalysis combined with ozone, namely photocatalytic ozonation. In this work, a dendritic bismuth vanadium tetraoxide (BiVO4) material composited with highly dispersed MnOv nanoparticles was synthesized, and its catalytic activity is 86.6% higher than bare BiVO4 in a visible light and ozone combined process. Catalytic ozonation experiments, ultraviolet- visible (UV-Vis) diffuse reflectance spectra and photoluminescence spectra jointly indicate that MnOA plays a triple role in this process. MnOv strengthens the light adsorption and promotes the charge separation on the composite material, and it also shows good activity in catalytic ozonation. The key reactive species in this process is OH, and various pathways for its generation in this process is proposed. This work provides a new direction of catalyst preparation and pushes forward the application of photocatalytic ozonation in water treatment.

关键词： manganese oxide bismuth vanadium tetraoxide photocatalytic ozonation hydroxyl radical cocatalyst

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Degradation behavior of 17α-ethinylestradiol by ozonation in the synthetic secondary effluent

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Journal of Environmental Sciences 2012年第2期24卷 228-233页

作者： Zheyun Zhang Hongtao Zhu Xianghua Wen Xiurong Si Environmental Simulation and Pollution Control State Key Joint Laboratory School of Environment Tsinghua University Beijing 100084 China School of Chemical ＆ Environmental Engineering China University of Mining and Technology Beijing 100083 China

Endocrine disrupting chemicals（EDCs） in the secondary effluent discharged from wastewater treatment plants（WWTPs） are of great concern in the process of water *** has been reported as a powerful oxidation technology to eliminate micropollutants in water *** to the complexity of the wastewater matrix,orthogonal experiments and single factor experiments were conducted to study the influence of operational parameters on the degradation of 17α-ethinylestradiol（EE2） in the synthetic secondary *** results of the orthogonal experiments indicated that the initial ozone and natural organic matter（NOM） concentration significantly affected EE2 degradation efficiency,which was further validated by the single factor confirmation ***2 was shown to be effectively degraded by ozonation in the conditions of low pH（6）,NOM（10 mg/L）,carbonate（50 mg/L）,but high suspended solid（20 mg/L） and initial ozone concentration（9 mg/L）.The study firstly revealed that the lower pH resulted in higher degradation of EE2 in the synthetic secondary effluent,which differed from EDCs ozonation behavior in pure ***2 degradation by ozone molecule instead of hydroxyl radical was proposed to play a key role in the degradation of EDCs by ozonation in the secondary *** ratio between O3 and TOC was identified as an appropriate index to assess the degradation of EE2 by ozonation in the synthetic secondary effluent.

关键词： ozonation EE2 pH natural organic matter secondary effluent

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Mechanisms for simultaneous ozonation of sulfamethoxazole and natural organic matters in secondary effluent from sewage treatment plant

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Frontiers of Environmental Science & Engineering 2021年第4期15卷 299-310页

作者： Xinshu Liu Xiaoman Su Sijie Tian Yue Li Rongfang Yuan Beijing Key Laboratory of Resource-oriented Treatment of Industrial Pollutants Department of Environmental Science and EngineeringUniversity of Science and Technology BeijingBeijing100083China

Sulfamethoxazole(SMX)is commonly detected in wastewater and cannot be completely decomposed during conventional treatment ***(O_(3))is often used in water *** study explored the influence of natural organic matters(NOM)in secondary effluent of a sewage treatment plant on the ozonation pathways of *** changes in NOM components during ozonation were also *** was primarily degraded by hydrolysis,isoxazole-ring opening,and double-bond addition,whereas hydroxylation was not the principal route given the low maximum abundances of the hydroxylated products,with m/z of 269 and *** hydroxylation process occurred mainly through indirect oxidation because the maximum abundances of the products reduced by about 70%after the radical quencher was added,whereas isoxazole-ring opening and double-bond addition processes mainly depended on direct oxidation,which was unaffected by the *** mainly affected the degradation of micropollutants by consuming•OH rather than O_(3)molecules,resulting in the 63%–85%decrease in indirect oxidation *** NOM in the effluent were also degraded simultaneously during ozonation,and the components with larger aromaticity were more likely degraded through direct *** dependences of the three main components of NOM in the effluent on indirect oxidation followed the sequence:humic-like substances>fluvic-like substance-s>protein-like *** study reveals the ozonation mechanism of SMX in secondary effluent and provides a theoretical basis for the control of SMX and its degradation products in actual water treatment.

关键词： Sulfamethoxazole ozonation Natural organic matters Secondary effluent Degradation mechanism

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Tracking the reactivity of ozonation towards effluent organic matters from WWTP using two-dimensional correlation spectra

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Journal of Environmental Sciences 2019年第2期31卷 289-298页

作者： Xin Jin Weijie Zhang Rui Hou Pengkang Jin Jina Song Xiaochang C.Wang School of Environmental and Municipal Engineering Xi'an University of Architecture and Technology

The characteristics of effluent organic matter(EfOM) from a wastewater treatment plant(WWTP) during ozonation were investigated using excitation and emission matrix(EEM)spectra, Fourier transform infrared spectroscopy(FT-IR) and high-performance size exclusion chromatography(HPSEC) at different ozone dosages. The selectivity of ozonation towards different constituents and functional groups was analysed using two-dimensional correlation spectra(2D-COS) probed by FT-IR, synchronous fluorescence spectra and *** results indicated that ozonation can destroy aromatic structures of EfOM and change its molecular weight distribution(MWD). According to 2D-COS analysis, microbial humiclike substances were preferentially removed, and then the protein-like fractions. Terrestrial humic-like components exhibited inactivity towards ozonation compared with the above two fractions. Protein-like substances with small molecular weight were preferentially reacted during ozonation based on 2D-COS probed by HPSEC. In addition, the selectivity of ozone towards different functional groups of EfOM exhibited the following sequence:phenolic and alcoholic C\O groups > aromatic structures containing C_C double bonds >aliphatic C\H. X-ray photoelectron spectroscopy(XPS) further elucidated the preferential reaction of aromatic structures in EfOM during ozonation.

关键词： ozonation Two-dimensional correlation spectra (2D-COS) Effluent organic matter (EfOM) Selectivity

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Adsorption in combination with ozonation for the treatment of textile waste water： a critical review

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Frontiers of Environmental Science & Engineering 2017年第1期11卷 17-34页

作者： Shraddha Khamparia Dipika Kaur Jaspal Symbiosis Centre for Research and Innovation Symbiosis International University Lavale. Pune-412115 India Symbiosis Institute of Technology A Constituent of Symbiosis International University Lavale Pune-412115 India

Intrusion of synthetic textile dyes in the ecosystem has been recognized as a serious issue worldwide. The effluents generated from textiles contain large amount of recalcitrant unfixed dyes which are regarded as emerging contaminants in the field of waste water study. Removal of various toxic dyes often includes diverse and complex set of physico-chemical, biological and advanced oxidation processes adopted for treatment. Adsorption in itself is a well-known technique utilized for treatment of textile effluents using a variety of adsorbents. In addition, ozonation deals with effective removal of dyes using high oxidising power of ozone. The review summarizes dye removal study by a combination of ozonation and adsorption methods. Also, to acquire an effective interpretation of this combined approach of treating wastewater, a thorough study has been made which is deliberated here. Results assert that, with the combined ability of ozone and a catalyst/adsorbent, there is high possibility of total elimination of dyes from waste water. Several synthetically prepared materials have been used along with few natural materials during the combined treatment. However, considering practical applicability, some areas were identified during the study where work needs to be done for effective implementation of the combined treatment.

关键词： Adsorption ozonation Catalytic ozonation Textile dyes Mineralization

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Experimental studies on ozonation of ethylenethiourea

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Journal of Environmental Sciences 2011年第1期23卷 65-69页

作者： Xinyu Dong Junwang Meng Bo Yang Yang Zhang Jie Gan XiShu Jinian Shu Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing 100085 China. E-mail: xinyudong@***

The experimental study on ozonation of ethylenethiourea （ETU） is conducted. The reaction of gas-phase ETU with 0.63 × 10^-6 mol/L ozone is carried out in a 200-L reaction chamber. The secondary organic aerosol （SOA） resulted from the ozonation of gas-phase ETU is observed with a scanning mobility particle size （SMPS）. The rapid exponential growth of SOA reveals that the atmospheric lifetime of ETU vapor towards ozone reaction is less than four days. The ozonation of dry ETU particles, ETU-contained water droplets and ETU aqueous solution is investigated with a vacuum ultraviolet photoionization aerosol time-of-flight mass spectrometer （VUV- ATOFMS）. The formation of 2-imidazoline is observed in the ozonation of dry ETU particles and ETU-contained water droplets. The formation of 2-imidazoline and ethvlenerea is observed in the ozonation of ETU aqueous solution.

关键词： ethylenethiourea pesticide ozonation VUV photoionization AMS

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