Article
Environmental Sciences
Yang Song, Sha Feng, Wen Qin, Jun Ma
Summary: In this study, expanded graphite (EG) was prepared and its application in catalytic ozonation was investigated. EG prepared at 500 degrees C showed the best performance for the mineralization of oxalic acid. The catalytic performance of EG remained stable after three repeated use, and its activity could be inhibited by certain ions. The degradation of oxalic acid, oxamic acid, and pyruvic acid was pH-dependent, and the degradation process of oxalic acid and oxamic acid was identified as mineralization. Manganese ion could promote the degradation of oxalic acid. The catalytic ozonation with EG has great potential in destroying refractory organic compounds.
ENVIRONMENTAL TECHNOLOGY
(2023)
Review
Engineering, Environmental
Christina M. Morrison, Samantha Hogard, Robert Pearce, Aarthi Mohan, Aleksey N. Pisarenko, Eric R. V. Dickenson, Urs von Gunten, Eric C. Wert
Summary: Ozone is widely used in drinking water as a disinfectant and oxidant, and has recently been applied in municipal wastewater treatment for potable reuse and ecosystem protection. However, the formation of bromate during ozonation, which is a potential human carcinogen, poses a challenge. The mechanisms of bromate formation from bromide are complex and involve reactions with both ozone and secondary oxidants. Various strategies can be applied, such as controlling bromide discharge, minimizing bromate formation during ozonation through chemical control, implementing pretreatment strategies, and utilizing downstream treatment processes for bromate abatement.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Engineering, Chemical
Diego Rodriguez-Llorente, Yu Liu, John C. de Mello, Juan Garcia, Marcos Larriba
Summary: The ability to recover acetic acid and related byproducts from wastewater treatment plants can provide a sustainable source of important building block-chemicals. A two-stage flow-based procedure using bio-derived organic solvents was developed for the extraction and back-extraction of acetic acid. The process achieved high recovery efficiencies and allowed for multiple extraction/back-extraction cycles.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Article
Environmental Sciences
Siqi Liu, Jaeshin Kim, Gregory V. Korshin
Summary: This study compared the effects of conventional ozonation and electrochemical oxidation on the formation of aldehydes and aliphatic carboxylic acids during the oxidation of natural organic matter in low-mineralized surface water. The results showed that both ozonation and electrochemical oxidation were effective in degrading the organic matter, but ozonation resulted in higher yields of aldehydes while electrochemical oxidation produced fewer aliphatic carboxylic acids. Furthermore, the presence of elevated carbonate concentration had a minor influence on disinfection by-products in electrochemical oxidation.
Article
Biochemistry & Molecular Biology
Sureeporn Suriyaprom, Pascale Mosoni, Sabine Leroy, Thida Kaewkod, Mickael Desvaux, Yingmanee Tragoolpua
Summary: Fruit phytochemicals with antioxidant properties can inhibit bacterial growth directly and modulate the expression of virulence factors, reducing the pathogenicity of bacteria.
Article
Environmental Sciences
Muhammad Saboor Siddique, Hongbo Lu, Xuejun Xiong, Hasan Fareed, Nigel Graham, Wenzheng Yu
Summary: This study investigated the influence of pH on the treatment of water-extractable organic matter (WEOM) and the formation potential of disinfection by-products (DBPs) during the pre-ozonation/nanofiltration process. The results showed that higher pH levels led to reduced water flux and membrane rejection due to increased electrostatic repulsion. Additionally, ozonation at higher pH levels transformed large molecular weight substances into smaller hydrophilic fractions and affected the formation potential of DBPs.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Environmental Sciences
Muammar Qadafi, Suprihanto Notodarmojo, Yuniati Zevi
Summary: This study showed that microbubble ozonation could reduce the formation of carcinogenic substances in tropical peat water, but increased the formation of other organic compounds.
Article
Engineering, Environmental
Ping Dong, Zhongming Chen, Xuan Qin, Yiwei Gong
Summary: The aqueous-phase oxidation of toluene is significantly influenced by liquid water, leading to different ring-cleavage pathways and product distributions compared to gas-phase oxidation. Water facilitates the formation of bicyclic peroxy radical (BPR) and enhances the production of organic acids through hydrogen-shift reactions. The influence of water on reaction mechanisms suggests that the aqueous-phase oxidation of hydrophobic organic compounds may play a more important role than previously assumed.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2021)
Review
Chemistry, Physical
Fernando J. Beltran, Ana Rey, Olga Gimeno
Summary: The study reviewed the application of catalytic ozonation processes in drinking water treatment for the removal of humic substances and disinfection byproducts. Besides presenting a brief history of disinfectant use and alternative oxidants, it focused on conventional AOPs recommended for treating disinfection byproducts, along with discussing the research achievements on the application of catalytic ozonation processes.
Article
Environmental Sciences
L. Alicia Garcia-Costa, I. A. Teresa Gouveia, M. Fernando R. Pereira, Adrian M. T. Silva, Arminda Alves, M. Luis Madeira, S. F. Monica Santos
Summary: This study successfully removed five cytostatics of concern from Portuguese WWTP effluents using non-catalytic ozonation. CAP and MPA were quickly eliminated while BICA, CYC, and IFO required breakdown via hydroxyl radicals generation for degradation. Increasing ozone dosage improved removal efficiency, with CAP, MPA, and IFO completely eliminated after 180 minutes.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Chemistry, Multidisciplinary
Lucy C. Ward, Hannah McCue, Daniel J. Rigden, Neil M. Kershaw, Chloe Ashbrook, Harry Hatton, Ellie Goulding, James R. Johnson, Andrew J. Carnell
Summary: Carboxyl methyltransferase enzymes from Aspergillus fumigatus showed high regioselectivity and good conversions in methylating a broad range of aromatic mono- and dicarboxylic acids. The second methylation of dicarboxylic acids exhibited strong pH dependence, with an optimum at pH 5.5-6. Potential for industrial biotechnology application was demonstrated in the production of a bioplastics precursor from bioderived 5-hydroxymethylfurfural.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Pharmacology & Pharmacy
Peera Tabboon, Thaned Pongjanyakul, Ekapol Limpongsa, Napaphak Jaipakdee
Summary: This study investigates the mucosal permeation and deposition of CBD in neat and binary vehicles. The results show that the permeation flux and deposition are influenced by the properties and combinations of the vehicles. The study provides basic information for the development of transmucosal CBD formulations.
Article
Engineering, Chemical
Nhan Trong Le, Ngoc Huyen Thi Chau, Phu Quynh Dinh Nguyen, Linh Thuy Thi Tran, Huong Thanh Phung, Hoai Thi Nguyen
Summary: This study utilized inexpensive green solvents, such as lactic acid, to extract berberine from Coscinium fenestratum. The optimized ultrasound-assisted extraction conditions resulted in high extraction efficiency and purity. The recovered lactic acid solvent and resin showed good reusability, and berberine extracted using lactic acid exhibited strong antibacterial activity without cytotoxicity. This research establishes a foundation for utilizing eco-friendly solvents in the extraction of alkaloids from medicinal plants.
SEPARATION AND PURIFICATION TECHNOLOGY
(2024)
Article
Engineering, Environmental
Qian-Yuan Wu, Lu-Lin Yang, Ye Du, Zi-Fan Liang, Wen-Long Wang, Zhi-Min Song, De-Xiu Wu
Summary: This study found that ozonation of wastewater generates various toxic byproducts, with formaldehyde contributing the most to cytotoxicity and genotoxicity in the absence of bromide. However, ozonation generally increases the overall toxicity of wastewater, especially when bromide is present.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2021)
Article
Engineering, Environmental
Hooman Vatankhah, Bahareh Tajdini, Reid P. Milstead, Erica Clevenger, Conner Murray, Detlef Knappe, Christina K. Remucal, Christopher Bellona
Summary: This study investigates the use of ozone and biologically active filtration as standalone and combined pretreatments to enhance the removal of perfluoroalkyl acids in wastewater effluent. It is found that both processes significantly improve the performance of granular activated carbon for PFAA removal. The combination of ozone and biologically active filtration outperforms the standalone processes, indicating its potential for effective PFAA removal.