Article
Engineering, Environmental
Nathan Moore, Chengjin Wang, Susan Andrews, Ron Hofmann
Summary: UV/Cl and UV/H2O2 are compared in terms of their efficiency in the degradation of contaminants in water, with the hypothesis that UV/Cl becomes more competitive as TOC concentration increases at neutral-to-high pH. The results indicate that UV/Cl shows less decrease in reaction rate coefficients for certain contaminants compared to UV/H2O2 as TOC concentration increases, suggesting that UV/Cl may be more energy-efficient in a wider range of treatment scenarios than previously thought.
Article
Engineering, Environmental
Zahra Amiri, Gholamreza Moussavi, Samira Mohammadi, Stefanos Giannakis
Summary: The study demonstrated the effectiveness of VUV-UVC/PMS process in treating river water by achieving efficient NOM mineralization and bacterial disinfection, with accelerated TOC removal and disinfection rate by adding PMS. Aeration played a crucial role in NOM mineralization, while sulfate enhanced TOC removal in the process.
JOURNAL OF HAZARDOUS MATERIALS
(2021)
Article
Engineering, Environmental
Yuyin Tang, Cheng-Shiuan Lee, Harold Walker, Christopher Gobler, Onur Apul, Arjun K. Venkatesan, Xinwei Mao
Summary: This study investigated the impact of residual H2O2 on the removal of AOP byproducts by two types of GAC, revealing that the presence of byproducts significantly inhibited the decomposition of H2O2 on Centaur. In multi-component systems, both GACs showed decreased byproduct removal kinetics and capacity due to competition.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
Article
Environmental Sciences
Xinqiang Chang, Tao Lin, Jiachen Mo, Hang Xu, Hui Tao, Wei Liu
Summary: The Fe(III)-UV/SPC process, which combines pre-coagulation-sedimentation with ultraviolet activated sodium percarbonate, shows improved removal rates of organic compounds and reduced UF membrane fouling, leading to enhanced safety of rural drinking water. This process allows for a lower dosage of SPC, effectively disrupts the cake layer structure on the UF membrane, reduces contaminant concentration, and alleviates membrane fouling.
Article
Environmental Sciences
M. A. Mirnasab, Hassan Hashemi, M. R. Samaei, A. Azhdarpoor
Summary: This study successfully upgraded the process of water treatment plant using integrated processes, effectively removing natural organic matters and avoiding the formation of carcinogenic by-products.
INTERNATIONAL JOURNAL OF ENVIRONMENTAL SCIENCE AND TECHNOLOGY
(2021)
Article
Engineering, Environmental
Xinglin Wang, Xuelin Wang, Jiru Mi, Qizhen Du, Yonglei Wang, Wenjuan Chen, Dapeng Sun, Wuchang Song, Mingrui Shao, Ruibao Jia
Summary: Algal organic matter (AOM) is an important source of toxic substances and poses a threat to safe water supplies. This study used a UV/H2O2/O3 advanced oxidation process to degrade AOM and found that it mainly consists of soluble microbial metabolites, tyrosin and tryptophan. The AOM also contains odorous substances and a small amount of geosmin.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2023)
Article
Engineering, Environmental
Mengjie Liu, Nigel J. D. Graham, Lei Xu, Kai Zhang, Wenzheng Yu
Summary: A bubbleless aerated BAC process was developed by installing a hollow fiber membrane module within a BAC filter, which improved the dissolved oxygen concentrations and enhanced the biodegradation and metabolism capacity. The ABAC system showed a higher electron transfer capacity and lower extracellular polymeric substances secretion, resulting in enhanced contaminant degradation efficiency and long-term stability. This proposed ABAC filter provides a practical example of how to shape and activate microbial community in BAC technology.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Environmental Sciences
Chih-Wei Pai, Gen-Shuh Wang
Summary: The study found that a higher concentration of oxidants resulted in better removal of PPCPs. The efficiency of removal of selected PPCPs was greatly improved when chlorine or hydrogen peroxide was used in combination with UV. While UV/Chlorine had higher PPCP removal efficiency than UV/H2O2, the latter resulted in smaller amounts of disinfection by-products in treated water.
Article
Food Science & Technology
Ming-Hsun Shen, Rakesh K. Singh
Summary: This study applied the advanced oxidation processes (AOP) combined with UV radiation and H2O2 solution to reduce aflatoxins in peanuts. The results showed that AOP treatment had a significant effect on reducing aflatoxins in milled peanuts, but not in whole peanuts. Drying treatment effectively removed residual H2O2 in peanuts.
FOOD AND BIOPROCESS TECHNOLOGY
(2022)
Article
Engineering, Environmental
Mengjie Liu, Nigel Graham, Lei Xu, Kai Zhang, Wenzheng Yu
Summary: Drinking water supply in rural areas is a challenging issue, and low-cost, efficient water treatment processes are needed to provide safe and affordable drinking water. This study proposes and evaluates a bubbleless aeration BAC (ABAC) process with a hollow fiber membrane (HFM) assembly, which improves dissolved oxygen (DO) throughout the filter and enhances DOM removal efficiency. Results show that ABAC significantly increases DOC removal and decreases disinfection byproduct formation compared to a comparable filter without aeration. The proposed ABAC treatment, with its various advantages, is well-suited for decentralized drinking water systems in rural areas.
Article
Biochemistry & Molecular Biology
Jose Antonio Andrades, Manuel Lojo-Lopez, Agata Egea-Corbacho, Jose Maria Quiroga
Summary: This study investigated the degradation of terbuthylazine in different types of water using various advanced oxidation processes (AOPs). The results showed that ultraviolet radiation and hydrogen peroxide photolysis were the most efficient methods, achieving degradation rates of over 90% in both batch and semi-continuous reactors.
Article
Environmental Sciences
Wuchang Song, Congcong Li, Zhenqi Du, Jiangang Yue, Wenjun Sun, Lian Hou, Jianguang Liu, Ruibao Jia
Summary: The UV/H2O2-BAC process is effective for organic matter removal, but efficiency can be affected by low water temperature. The development of BAC contributes to dissolved organic carbon removal.
Article
Environmental Sciences
Hye J. Kang, Jeongeem Ahn, Hyeona Park, Kwang-Ho Choo
Summary: UV irradiation and BAC were found to be effective in removing nitrosamines from water intended for consumption, with UV photolysis requiring high doses and potential desorption issues with BAC. Combined treatments using UV and BAC processes offer promising alternative strategies for eliminating nitrosamines when treating water for human consumption.
Article
Engineering, Environmental
Congyu Hou, Li Chen, Yawen Dong, Yulong Yang, Xihui Zhang
Summary: The performance of an integrated process comprising coagulation, ozonation, catalytic ceramic membrane filtration (CMF), and biological active carbon (BAC) treatment in producing biostable finished water was evaluated. The fate of dissolved organic matter (DOM) at the molecular level was explored using Fourier-transform ion cyclotron resonance mass spectrometry (FT-ICR MS).
Article
Environmental Sciences
Mengqiao Luo, Zhaoyang Wang, Can Zhang, Bo Song, Demin Li, Pengwei Cao, Xiaoqing Peng, Shenglin Liu
Summary: This study elucidated the changes of natural organic matter (NOM) after electrochemical oxidation and its effects on the molecular characteristics of organic matter in water using various analytical methods. The results showed that some NOM molecules were transformed into precursors of refractory organic pollutants after the treatment, which might originate from terrestrial humus.
