Article
Engineering, Environmental
Nan Wang, Ruoxi Xiong, Gong Zhang, Ruiping Liu, Xingyang He, Shier Huang, Huijuan Liu, Jiuhui Qu
Summary: Long-term exposure to excessive iodine in drinking water increases the risk of thyroid diseases. In this study, a heterogeneous Bi2O3@MnO2 interface was constructed for iodine removal, showing high adsorption capacity and oxidation efficiency. The results demonstrated the important roles of Bi2O3 and MnO2 in iodine adsorption and oxidation, leading to the high iodine removal capability of Bi2O3@MnO2.
Article
Environmental Sciences
Andre Luis Correa de Barros, Daniel Aparecido da Silva Rodrigues, Camila Cristina Rodrigues Ferreira da Cunha, Silvana de Queiroz Silva, Robson Jose de Cassia Franco Afonso
Summary: This study evaluated the degradation of fipronil under typical chlorination conditions, identified its disinfection by-products, and assessed the toxicity of unreacted and chlorinated solutions. The results showed that chlorination quickly degraded fipronil and produced toxic disinfection by-products, with potential mutagenic and developmental toxicant properties.
WATER AIR AND SOIL POLLUTION
(2021)
Article
Engineering, Environmental
Sang-Heon Na, Min-Ji Kim, Jun-Tae Kim, Seongpil Jeong, Seunghak Lee, Jaeshik Chung, Eun-Ju Kim
Summary: The study found that the removal efficiency of microplastics in traditional drinking water treatment plants is influenced by the size of microplastics, the type of coagulant, and water characteristics. They used X-ray microcomputed tomography technique and two-site kinetic modeling to discover that microplastics below 20 microns were retained by attachment to the sand surface.
Article
Engineering, Environmental
Yida Fang, Pingping Meng, Charles Schaefer, Detlef R. U. Knappe
Summary: In this study, an integrated anion exchange resin (AER) and electrochemical oxidation (ECO) treatment train was used to remove and destroy four structurally different perfluoroalkyl ether carboxylic acids (PFECAs). The results showed that flow-through columns packed with PFAS-selective AERs were highly effective for the removal of PFECAs, and the affinity of PFECAs was strongly correlated with their hydrophobic features. The regeneration of spent resin columns required a high percentage of organic cosolvent for achieving PFECA release, and the regeneration efficiency was higher for a macroporous resin than a gel-type resin. The treatment of spent regenerants resulted in high removal of methanol and conversion of PFECAs, with a significant recovery of organic fluorine as inorganic fluoride. Trifluoroacetic acid (TFA), perfluoropropionic acid (PFPrA), and perfluoro-2-methoxyacetic acid (PFMOAA) were identified as transformation products (TPs), and degradation schemes and reaction pathways for the four PFECAs were proposed. Dissolved organic matter (DOM) inhibited the uptake, regeneration, and oxidation of PFECAs, suggesting the need for pretreatment steps targeting DOM removal to enhance the treatment efficiency of the system.
Review
Engineering, Environmental
Husein Almuhtaram, Chengjin Wang, Ron Hofmann
Summary: Many UV experiments are conducted without accurate fluence measurement, which can affect interpretation of results. Studies show inconsistencies in the direct photolysis of microcystin-LR, with most not following proper fluence calculation procedures.
ENVIRONMENTAL SCIENCE & TECHNOLOGY LETTERS
(2021)
Article
Environmental Sciences
Wenting Wang, Sangmin Park, Byeong-gyu Choi, Jeong-Eun Oh
Summary: This study investigated the occurrence and removal of four benzotriazoles (BTRs) and five benzothiazoles (BTHs) in drinking water treatment plants (DWTPs) and bottled water. The average concentrations of BTRs and BTHs were highest in raw water, followed by treated water and bottled water. Different distribution patterns were observed with 1H-BTR being dominant in raw water and BTH being predominant in bottled water. BTRs were efficiently removed, especially during adsorption processes, while BTHs were not effectively removed in DWTPs.
ENVIRONMENTAL POLLUTION
(2023)
Article
Environmental Sciences
Joan Dalmau-Soler, Ruben Ballesteros-Cano, Ma Rosa Boleda, Miquel Paraira, Nuria Ferrer, Silvia Lacorte
Summary: This study examined the presence of microplastics in the Llobregat river basin in Catalonia, Spain, and their removal efficiency in the drinking water treatment plant (DWTP). Sand filtration was identified as the key stage in microplastic removal, with ultrafiltration/reverse osmosis proving more effective for removal than ozonation/carbon filtration. Preliminary migration tests were also conducted to identify potential sources of microplastics in each treatment step.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2021)
Article
Engineering, Environmental
Emilia Marques Brovini, Fernanda Deister Moreira, Maria Elvira Poleti Martucci, Sergio Francisco de Aquino
Summary: The development of technologies to remove pesticides from environmental matrices is crucial due to their potential toxicity to the environment and human health. This review aimed to assess the treatability of five selected pesticides and the main treatment processes used worldwide. Conventional technologies alone showed limited effectiveness, with atrazine removal averaging up to 50%. Advanced oxidation processes, such as ozone treatment, demonstrated better results, but practical application is still limited. Titanium dioxide showed promise for acephate and methamidophos removal, while anodic Fenton treatment and a combination of Fenton and ultrasound were highly efficient in removing carbofuran. Overall, advanced oxidation processes are promising complementary technologies, but the fate and toxicity of transformation by-products need to be evaluated for large-scale application.
JOURNAL OF WATER PROCESS ENGINEERING
(2023)
Article
Environmental Sciences
Mengyue Wang, Shunwen Bai, Xiuheng Wang
Summary: In order to address clogging issues in stormwater filtration systems, a drinking water treatment residual (DWTR)-based granule (DBG) substrate was developed by pyrolyzing and granulating DWTR with bentonite and corncob. The DBG showed improved stability and enhanced adsorption capacity for heavy metals, but lower adsorption capacity for phosphate compared to DWTR. The involvement of DBG in stormwater filtration systems resulted in consistent and effective removal of Cu(II), Pb(II), Cd(II) and PO4-P, with irreversible and strong interaction between contaminants and DBG.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2021)
Article
Engineering, Environmental
Dongwon Cha, Sanghun Park, Min Sik Kim, Taewan Kim, Seok Won Hong, Kyung Hwa Cho, Changha Lee
Summary: This study demonstrates machine learning models based on the random forest algorithm for predicting the abatement of micropollutants during ozonation processes. The models use input variables such as pH, alkalinity, dissolved organic carbon concentration, and FEEM data, with high-resolution FEEM data showing higher prediction accuracy. Utilizing organic matter characteristics quantified by FEEM can improve the accuracy of the model in predicting oxidant exposures.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2021)
Article
Engineering, Environmental
Shuyuan Tang, Ling Gao, Aisi Tian, Tianrui Zhao, Donglei Zou
Summary: This article studied the coagulation behavior of microplastics (MPs) that are difficult to remove during drinking water treatment. The results showed that both the size and concentration of MPs had a significant impact on coagulation, with size being the main factor. The type of MPs did not have a significant effect on coagulation. After optimization of operating conditions, the removal efficiency of MPs with a size ≥13 μm could reach over 70% using PAC and PAM. In the coagulation process, PAC played the most important role through electrical neutralization, while PAM's adsorption bridging and net sweeping assisted in coagulation.
JOURNAL OF WATER PROCESS ENGINEERING
(2023)
Article
Engineering, Environmental
Aanchal Rathi, Soumen Basu, Sanghamitra Barman
Summary: The study investigated the adsorption behavior of phenylpyrazole insecticide-fipronil, an endocrine disrupting compound, on modified zeolites. The results showed that the Langmuir adsorption isotherm and pseudo-second-order kinetic model well described the adsorption process. Thermodynamics revealed that the adsorption process is spontaneous and exothermic.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
Article
Environmental Sciences
Josep Borrull, Agusti Colom, Josepa Fabregas, Francesc Borrull, Eva Pocurull
Summary: This study investigated the occurrence and removal of 60 organic micropollutants in a drinking water treatment plant, revealing that granular activated carbon and ozonation are the most efficient removal technologies. Additionally, some compounds were still not effectively removed in the finished drinking water.
Article
Chemistry, Physical
Ramune Albrektiene-Placake, Kristina Baziene, Justinas Gargasas
Summary: Sapropel is a biodegradable material used for water treatment, with sorption properties. It is effective in removing lead and fluorides from aqueous solutions. The most efficient removal of lead was achieved with the lowest doses of sapropel, while the highest doses and longer mixing times were needed for fluoride removal.
Article
Chemistry, Multidisciplinary
Kazumasa Oshima, Hiromichi Kondo, Eriko Konishi, Tsuyoshi Yamamoto, Yoshifumi Tsuge, Takayuki Watanabe, Masahiro Kishida
Summary: The study investigated the effective removal of As(iii) from wastewater by catalytic oxidation to As(v) and precipitation with Fe(iii) ions. The combination of Pt/SiO2 catalyst and Fe(iii) precipitant improved the removal efficiency of As(iii) by functioning as both oxidation and precipitation sites.
