Article
Engineering, Environmental
Cristina Agabo-Garcia, Guillermo Repetto, Mha Albqmi, Gassan Hodaifa
Summary: Different eco-friendly processes were studied to treat olive mill wastewater for the European 2024 zero-waste plan. The application of advanced oxidation processes, flocculation, and filtration proved to be effective in obtaining high-quality regenerated water. However, the increase in total iron content resulted in toxicity, which was resolved through subsequent flocculation and filtration steps. The optimized process achieved regenerated water suitable for irrigation with improved quality parameters.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2023)
Article
Green & Sustainable Science & Technology
Petros Mastoras, Stergios Vakalis, Michail S. Fountoulakis, Georgia Gatidou, Panagiota Katsianou, Georgios Koulis, Nikolaos S. Thomaidis, Dias Haralambopoulos, Athanasios S. Stasinakis
Summary: This study evaluated the use of solar distillation for olive mill wastewater management by constructing a pilot-scale solar still. The results showed that higher temperatures in the distillation process led to increased concentrations of total phenols, tyrosol, and hydroxytyrosol in the distillates. Additionally, the use of a heated underfloor system in the pilot system improved the average and maximum daily temperatures in the still and increased the production rates of the distillates. Liquid chromatography - high resolution mass spectrometry analysis detected concentrations of tyrosol and 4- hydroxybenzoic acid in the collected distillates. Economic evaluation showed that the operational and overall costs for upscaling the pilot system were estimated to 0.60 and 1.21 euro/m3, respectively, considering the reuse of the distillate for washing and malaxation of olive fruits and selling the solid residue as biofuel.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Chemistry, Applied
M. Roccamante, A. Ruiz-Delgado, A. Cabrera-Reina, S. Malato, I. Oller, A. Hernandez-Zanoletty, S. Miralles-Cuevas
Summary: This study investigated the removal efficiency of microcontaminants (MCs) from natural water using iron nanoparticles derived from olive mill wastewater (ZVI-OMW) combined with oxidants under solar radiation. The effects of corrosion, adsorption, solar photolysis, and different concentrations of H2O2, S2O82-, carbonates, and ZVI-OMW were examined. Lab tests showed that the optimal treatment option was the combination of 1 mM S2O82- with NW and 1 mM ZVI-OMW. Pilot-scale experiments were conducted in raceway pond reactors (RPR) and a compound parabolic collector (CPC) photo-reactor. The results showed that the removal time of microcontaminants increased with liquid depth in the RPR, while the mass removal rate increased with depth in the CPC, but higher ZVI-OMW concentration hindered the process efficiency in both reactors.
Article
Green & Sustainable Science & Technology
Margarita A. Petoussi, Nicolas Kalogerakis
Summary: A mechanistic state-space model was developed to describe the dynamics of olive mill wastewater (OMW) treatment with pomegranate and myrtle plants, and to assess the contribution of the plants in the overall remediation process. The model considers phytodegradation, rhizodegradation, accumulation of organic matter on plant roots, microbial growth and decay, and enzymatic decomposition. The model predicts that phytoremediation processes contribute over 91% to the removal of OMW organics and nutrients, regardless of the wastewater organic strength.
Article
Environmental Sciences
Raid Alrowais, Rania Saber Yousef, Osama konsowa Ahmed, Mohamed Mahmoud-Aly, Mahmoud M. Abdel Daiem, Noha Said
Summary: This study aims to investigate an integrated detoxification treatment sequence to safely reuse olive mill wastewater (OMWW) for barley germination. The results showed that the treated OMWW could enhance barley growth and reduce phytotoxicity, as well as degrade harmful substances and heavy metals.
ENVIRONMENTAL SCIENCES EUROPE
(2023)
Article
Chemistry, Multidisciplinary
Srikanth Vuppala, Riyaaz Uddien Shaik, Marco Stoller
Summary: The research focused on introducing grey relational analysis to optimize the coagulation and flocculation process of olive mill wastewater (OMW), aiming to select the best coagulant dosage for multi-response reduction. Implementing statistical techniques in OMW treatment can improve process efficiency and support sustainable waste stream preparation for further purification processes.
APPLIED SCIENCES-BASEL
(2021)
Article
Environmental Sciences
Sumera Shabir, Noshin Ilyas, Maimona Saeed, Fatima Bibi, R. Z. Sayyed, Waleed Hassan Almalki
Summary: Olive mill wastewater (OMW) generated by olive oil production contains high levels of salt, organic matter, suspended particles, and toxic chemicals (especially phenols), which leads to increased biological and chemical oxygen demand. However, after pretreatment and treatment processes, OMW can have positive effects on plant development due to its high mineral content and organic matter. Evaluating the effects of treated and untreated OMW on soil fertility can provide insights into its potential role in increasing soil productivity.
ENVIRONMENTAL RESEARCH
(2023)
Article
Environmental Sciences
M. A. Al-Shaweesh, A. Awad, D. Al-Kabariti, M. S. Al-Hwaiti, O. A. Al-Kashman, A. F. Khafaga, M. E. Abd El-Hack, F. A. Adday
Summary: Solid wastes and wastewater produced by olive industries pose toxic pollution to the environment. This research introduces a treatment process using low-cost chemical coagulants as the main method, achieving a 99.5% removal rate of contaminants through filtration and addition of hydrogen peroxide.
INTERNATIONAL JOURNAL OF ENVIRONMENTAL SCIENCE AND TECHNOLOGY
(2023)
Article
Biotechnology & Applied Microbiology
Chrysanthi Berberidou, Sophia Tsoumachidou, Ioannis Paspaltsis, Vasiliki Kitsiou, Eirini Kanata, Konstantinos Xanthopoulos, Theodoros Sklaviadis, Athansios Arsenakis, Ioannis Poulios
Summary: This study investigated the potential of heterogeneous and homogeneous photocatalytic oxidation for the treatment of liquid hazardous medical wastewater produced by healthcare laboratories. The results showed that under optimal conditions, photo-Fenton-assisted TiO2 photocatalytic oxidation was the most efficient process for detoxification and disinfection of the tested toxic effluents. The reuse of catalyst was also examined and verified for five sequential runs. The performance of the pilot photocatalytic inactivation system demonstrated effective inactivation of bio-pollutants, including a significant reduction in the survival of resistant bacterial endospores.
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
(2023)
Article
Environmental Sciences
Nuno Jorge, Ana R. Teixeira, Marco S. Lucas, Jose A. Peres
Summary: Due to the consumers' demand for quality wines, the production of winery wastewater with a high organic content poses potential environmental impacts. This study introduces the production of natural organic coagulants and their application in the coagulation-flocculation-decantation process, accompanied by a photo-Fenton process using hydrogen peroxide and potassium persulfate. The results demonstrate effective removal of turbidity, total suspended solids, and dissolved organic carbon from the wastewater. Furthermore, the combination of the two processes reduces operational costs and ensures compliance with wastewater discharge standards.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2023)
Article
Engineering, Environmental
Srikanth Vuppala, Larissa O. Paulista, Ines L. Pinho, Ana I. Gomes, Francisca C. Moreira, Daniela F. S. Morais, Ramiro J. E. Martins, Vitor J. P. Vilar
Summary: A treatment train for the remediation of raw olive mill wastewater was investigated, and a system consisting of pre-treatment, coagulation, biological oxidation, and advanced oxidation process (AOP) was proposed. The coagulation and biological oxidation stages achieved high removal efficiencies of various pollutants, while different AOPs had varying degrees of effectiveness. The operational costs for the different stages varied, with ozonation being the most expensive.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
Article
Environmental Sciences
Charikleia Zampeta, Chrysanthi Paparouni, Andreas Tampakopoulos, Zacharias Frontistis, Nikolina Charalampous, Stefanos Dailianis, P. G. Koutsoukos, C. A. Paraskeva, Dimitris V. Vayenas
Summary: Raw printing ink wastewater can be effectively treated using inorganic coagulants, organic flocculants, and hydrodynamic cavitation. This combined process can significantly reduce color, chemical oxygen demand, and total suspended solids, while also reducing treatment costs.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2022)
Article
Engineering, Environmental
Bruno M. Esteves, Sergio Morales-Torres, Francisco J. Maldonado-Hodar, Luis M. Madeira
Summary: Iron oxide catalysts supported on activated carbon prepared from olive stones show high efficiency in the degradation of refractory polyphenolic solutions and olive mill wastewater, achieving high removal and mineralization rates, and reducing the eco-toxicity of the wastewater.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Engineering, Environmental
Bruno M. Esteves, Rita Fernandes, Sergio Morales-Torres, Francisco J. Maldonado-Hodar, Adrian M. T. Silva, Luis M. Madeira
Summary: The integration of catalytic wet peroxidation (CWPO) and direct contact membrane distillation (DCMD) was used to study the degradation of organic matter and the recovery of water in olive mill wastewater (OMW). The results showed that CWPO-treated OMW samples allowed for higher fluxes in the DCMD unit and showed higher rejections of organic matter from the feed solution. Treated OMW samples also met the legislated thresholds required for direct discharge for crops irrigation.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Engineering, Environmental
Bruno M. Esteves, Sergio Morales-Torres, F. J. Maldonado-Hodar, Luis M. Madeira
Summary: By transforming the by-product of olive mill's operation into activated carbon and using it as support for Fe-based catalysts, effective catalytic performance was achieved in the treatment of OMW wastewater.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Environmental Sciences
Alexandra Ioannidi, Olga S. Arvaniti, Maria-Christina Nika, Reza Aalizadeh, Nikolaos S. Thomaidis, Dionissios Mantzavinos, Zacharias Frontistis
Summary: The study found that heat-activated persulfate can effectively degrade losartan, with increased temperature and persulfate concentration enhancing degradation efficiency. However, the presence of bicarbonates and humic acid negatively affect the oxidation of LOS.
Article
Environmental Sciences
Charikleia Zampeta, Kleio Bertaki, Irene-Eva Triantaphyllidou, Zacharias Frontistis, P. G. Koutsoukos, Dimitris V. Vayenas
Summary: The study utilized a pilot-scale HC system followed by sedimentation for decolorization of industrial-grade inks, a mixture of inks, and printing ink wastewater. Optimal conditions of hydrogen peroxide concentration, pH, and treatment time were defined to achieve high decolorization efficiency. The results suggest that the combined HC/SED system is effective for color removal and superior to other technologies in terms of efficiency and cost.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2022)
Article
Environmental Sciences
Charikleia Zampeta, Chrysanthi Paparouni, Andreas Tampakopoulos, Zacharias Frontistis, Nikolina Charalampous, Stefanos Dailianis, P. G. Koutsoukos, C. A. Paraskeva, Dimitris V. Vayenas
Summary: Raw printing ink wastewater can be effectively treated using inorganic coagulants, organic flocculants, and hydrodynamic cavitation. This combined process can significantly reduce color, chemical oxygen demand, and total suspended solids, while also reducing treatment costs.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2022)
Review
Environmental Sciences
Olga S. Arvaniti, Alexandra A. Ioannidi, Dionissios Mantzavinos, Zacharias Frontistis
Summary: This work provides a critical review of recent studies on the use of heat-activated persulfate to degrade persistent micropollutants. The influence of various operating parameters, such as temperature and oxidant concentrations, is discussed, with higher temperatures and oxidant concentrations generally improving efficiency. The effect of the aqueous matrix is particularly emphasized, as studies have shown that the removal of pollutants decreases with increased complexity of the aqueous matrix, unless specific oxidative species are produced. The study also highlights the growing interest in combining different processes for persulfate activation and summarizes recent research on hybrid systems for micropollutant destruction.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2022)
Article
Environmental Sciences
Charikleia Zampeta, Foteini Arvanitaki, Zacharias Frontistis, Nikolina Charalampous, Stefanos Dailianis, P. G. Koutsoukos, Dimitris V. Vayenas
Summary: This study investigates the treatment of printing ink wastewater using different methods. It finds that hydrodynamic cavitation (HC) and pH fixation treatment can effectively remove pollutants, with a combination of these methods being the most efficient. The treated printing ink wastewater is not only cost-effective, but also significantly reduces toxicity.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2022)
Article
Chemistry, Physical
V. Faka, M. Griniezaki, G. Kiriakidis, E. Grilla, D. Mantzavinos, Samuel Mao, Shaohua Shen, Z. Frontistis, V. Binas
Summary: ZnWO4/CNNs nanocomposites were successfully prepared through a simple method at room temperature. The optimum loading of carbon nitride nanosheets (CNNs) for the formation of the nanocomposites was investigated, and it was found that the material with 30 wt% ZnWO4/CNNs exhibited the higher photocatalytic activity. The photocatalytic mechanism was found to be mainly driven by photogenerated holes and superoxides.
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
(2022)
Article
Environmental Sciences
Olga S. Arvaniti, Georgia Antonopoulou, Georgia Gatidou, Zacharias Frontistis, Dionissios Mantzavinos, Athanasios S. Stasinakis
Summary: Recent studies have found that microplastics are widely present in various environments. This study examined the sorption of two commonly used antihypertensive drugs onto polystyrene microplastics and investigated the effects of water matrix, pH, salinity, and aging on their sorption. The results indicate that the sorption of these drugs onto the microplastics is a slow process and is influenced by various factors. These findings suggest that microplastics could have potential adverse effects on the environment and public health.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Environmental Sciences
Kosmas Lalas, Olga S. Arvaniti, Eirini Zkeri, Maria-Christina Nika, Nikolaos S. Thomaidis, Dionissios Mantzavinos, Athanasios S. Stasinakis, Zacharias Frontistis
Summary: The heat-activated persulfate system showed promising results in the destruction of the widely used antibiotic Ampicillin (AMP). The removal of AMP exhibited exponential decay and was enhanced by persulfate dosage and higher temperatures. The formation of sulfate radicals was identified as the main reactive species. The experiments also revealed the absence of significant inhibition of microalgae after treatment with persulfate.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Chemistry, Physical
Alexandra A. Ioannidi, John Vakros, Zacharias Frontistis, Dionissios Mantzavinos
Summary: Spent malt rootlet-derived biochar was modified by a friendly eco-method, which significantly enhanced the surface area and changed the morphology and carbon phase. The acid-treated biochar exhibited better degradation of the drug losartan. The oxidation of losartan mainly occurred through a non-radical mechanism.
Article
Chemistry, Physical
Spyridon Giannakopoulos, John Vakros, Zacharias Frontistis, Ioannis D. Manariotis, Danae Venieri, Stavros G. Poulopoulos, Dionissios Mantzavinos
Summary: Pyrolysis of lemon stalks at 850 degrees C under limited oxygen produces highly active and selective biochar that can activate persulfate ion and oxidize sulfamethoxazole (SMX). The biochar consists mainly of carbon and oxygen atoms, with calcium and potassium as the most abundant minerals. It has a moderate specific surface area of 154 m(2) g(-1) and contains carbonate species, possibly in the form of calcium carbonate. In ultrapure water, complete degradation of 0.5 mg L-1 SMX can be achieved within 20 minutes using 500 mg L-1 sodium persulfate (SPS) and 100 mg L-1 biochar. The biochar remains stable for at least five cycles and shows potential as a sustainable, metal-free catalyst.
Article
Environmental Sciences
Alexandra A. Ioannidi, Joanne Zappa, Athanasia Petala, Manolis Souliotis, Dionissios Mantzavinos, Zacharias Frontistis
Summary: The pursuit of low-cost, high-efficiency co-catalysts without noble metals in photocatalysis has attracted significant interest in recent years. In this study, a series of cobalt phosphide (CoP 0.125-1.00 wt.%) promoted bismuth vanadate (BiVO4) photocatalysts were synthesized and characterized. The efficiency of these photocatalysts was investigated for sulfamethoxazole (SMX) degradation under simulated solar light irradiation. The results showed that the deposition of a small amount of CoP on BiVO4 enhanced SMX degradation.
Review
Biotechnology & Applied Microbiology
Zacharias Frontistis, Anastasios Sarmpanis, Grigoris Lykogiannis
Summary: This article reviews the research on using ultrasound-induced vibration to mitigate membrane fouling in membrane bioreactors. It discusses the physical and chemical mechanisms of ultrasound and proposes future research directions and a roadmap for implementing ultrasound technology.
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
(2023)
Editorial Material
Environmental Sciences
Gassan Hodaifa, Antonio Zuorro, Joaquin R. Dominguez, Juan Garcia Rodriguez, Jose A. Peres, Zacharias Frontistis, Mha Albqmi
Article
Chemistry, Physical
Alexandra A. Ioannidi, Maria Vlachodimitropoulou, Zacharias Frontistis, Athanasia Petala, Eleni Koutra, Michael Kornaros, Dionissios Mantzavinos
Summary: This study examines the use of pristine Mo2C as a sodium persulfate (SPS) activator for the degradation of the drug losartan (LOS). The results show that acidic pH enhances LOS decomposition, and the apparent kinetic constant decreases with higher LOS concentrations. Sulfate radicals, hydroxyl radicals, and singlet oxygen are identified as the reactive species in LOS oxidation, with singlet oxygen being the predominant species. The addition of chloride accelerates the degradation rate, while bicarbonate and organic matter reduce the efficiency. The study also investigates the application of the Mo2C/SPS system for simultaneous LOS decomposition and elimination of Escherichia coli, with significant synergistic effects observed when simulated solar irradiation is present.
Review
Environmental Sciences
Biswaranjan Paital, Kajari Das, Fatemeh Malekdar, Miguel A. Sandoval, Elnaz Karamati Niaragh, Zacharias Frontistis, Tapas Ranjan Behera, Gabriella Balacco, Sarawut Sangkham, Akshaya Kumar Hati, Milad Mousazadeh
Summary: In addition to the health effects of COVID-19, the scientific community is investigating the water-related impacts, particularly the transmission of the SARS-CoV-2 virus through sewage. The review discusses the detection and fate of the virus in sewage treatment facilities and explores potential wastewater treatment processes to manage various viruses, including SARS-CoV-2. The study emphasizes the importance of implementing appropriate actions to regulate the release of wastewater from COVID-19 facilities.
Article
Engineering, Environmental
Rong-Gui Zhu, Chang-Gui Pan, Feng-Jiao Peng, Chao-Yang Zhou, Jun-Jie Hu, Kefu Yu
Summary: This comprehensive survey investigated the occurrence, bioaccumulation, and trophic magnification of parabens and their metabolite 4-HB in a marine food web. Results showed that parabens were the predominant pollutants in marine organisms, with significant bioaccumulation from sediments. The estimated trophic magnification factor indicated biomagnification for MeP and trophic dilution for 4-HB. Overall, the risks for humans consuming marine organisms were found to be low.
Article
Engineering, Environmental
Andres F. Torres-Franco, Deborah Leroy-Freitas, Cristina Martinez-Fraile, Elisa Rodriguez, Pedro A. Garcia-Encina, Raul Munoz
Summary: Anaerobic and microalgae-based technologies have emerged as sustainable alternatives for municipal wastewater treatment. However, the presence of viruses in the treated wastewater is a major concern for reuse applications. This study assessed the ability of these technologies to reduce viruses during secondary wastewater treatment. The results showed that all technologies were effective in reducing the concentration of viruses, with microalgae-based treatment exhibiting the highest potential for reducing the disinfection requirements of treated wastewater.
Article
Engineering, Environmental
Young Gwang Kim, Sae Yun Kwon, Spencer J. Washburn, Scott C. Brooks, Ji Won Yoon, Lucien Besnard
Summary: The study uses Hg isotope ratios to identify the sources and exposure pathways of mercury in bivalves, finding that dissolved Hg phases in the water column are the primary source and exposure pathway to bivalves. This provides new insights into using bivalves as bioindicators for sediment quality monitoring.
Article
Engineering, Environmental
Hui Geng, Ying Xu, Rui Liu, Dianhai Yang, Xiaohu Dai
Summary: This study investigates the effect of cation exchange resin (CER) on the sequential recovery of hydrogen and methane from anaerobic digestion (AD) and the corresponding mechanisms. The results show that CER can simultaneously enhance the production of hydrogen and methane by promoting the solubilisation, hydrolysis, and acidification of organic matter. Additionally, CER facilitates effective contact between bacteria and organic particulates and reduces the energy barrier for mass transfer during methane production. The study also reveals changes in the microbial community structure and metagenomics during the AD process.
Article
Engineering, Environmental
Xiaojing Lin, Zhan Jin, Shunfeng Jiang, Zhiquan Wang, Suqing Wu, Ke Bei, Min Zhao, Xiangyong Zheng
Summary: Dehumidification combined with addition of absorbent resin supplement (ARS) was used to achieve rapid evaporation of non-pretreated urine, resulting in high water evaporation efficiency and nutrient recovery.
Article
Engineering, Environmental
Yangli Che, Chaoran Lin, Shen Li, Jiao Liu, Longhai Zhu, Shilei Yu, Nan Wang, Haoshuai Li, Mutai Bao, Yang Zhou, Tonghao Si, Rui Bao
Summary: Hydrodynamic processes play a crucial role in the transmission of sediments, microbial assembly, and organic carbon redistribution in the ocean. Through experiments and analysis, we found that hydrodynamics shape the assembly of microbial communities and control the redistribution of different sourced organic carbon, thereby influencing microbial-mediated biogeochemical transformation.
Article
Engineering, Environmental
Chao Chen, Yu Yang, Nigel J. D. Graham, Zhenyu Li, Xingtao Yang, Zhining Wang, Nadia Farhat, Johannes S. Vrouwenvelder, Li -an Hou
Summary: The fouling of seawater reverse osmosis membranes is a persistent challenge in desalination. This study monitored the operational performance of a desalination plant for 7 years and the fouling development in different areas of membrane modules. The findings showed that operational performance declined over time and fouling mainly occurred at the feed side of the modules, with the highest microbial diversity. Keystone species like Chloroflexi and Planctomycetes played an important role in maintaining community structure and biofilm maturation. Polysaccharides, soluble microbial products, marine humic acid-like substances, and inorganic substances contributed to fouling. Overall, biofouling had a significant impact on membrane fouling after 7 years of operation.
Article
Engineering, Environmental
Dan Li, Jieyi Sun, Yibo Fu, Wentao Hong, Heli Wang, Qian Yang, Junhong Wu, Sen Yang, Jianhui Xu, Yunfei Zhang, Yirong Deng, Yin Zhong, Ping'an Peng
Summary: Sulfidation-oxidation treatment of magnetite (Fe3O4) enhances the production of dark center dot OH, which can efficiently degrade dissolved organic matter (DOM) and accelerate carbon cycling.
Article
Engineering, Environmental
Cheng Yu, Kaijun Wang, Kaiyuan Zhang, Ruiyang Liu, Pingping Zheng
Summary: This study implemented a microaerobic-aerobic configuration in a full-scale municipal wastewater treatment facility and investigated the effects on sludge characteristics, pollutant removal, microbial community, and granulation mechanisms. The results showed successful transition from flocculent-activated sludge to well-defined AGS after two months of operation. The primary pathways for pollutant removal were simultaneous nitrification, denitrification, and phosphorus removal. Moreover, the incorporation of internal separators induced shifts in the flow pattern, which promoted granulation.
Article
Engineering, Environmental
Zhe Zhang, Shaoyang Hu, Guangrong Sun, Wei Wang
Summary: Halogenated aromatic disinfection byproducts (DBPs), such as halogenated phenols, have garnered widespread attention due to their high toxicity and prevalence. This study reports on the analysis, occurrence, and cytotoxicity of a group of emerging halogenated aromatic DBPs, known as halogenated polyhydroxyphenols (HPPs), in drinking water.
Article
Engineering, Environmental
Shengyue Chen, Jinliang Huang, Peng Wang, Xi Tang, Zhenyu Zhang
Summary: Accurate prediction of river water quality is crucial for sustainable water management. This study introduces wavelet analysis and transfer learning techniques to assist LSTM modeling, proposing a newly coupled modeling approach that improves short-term prediction of river water quality.
Article
Engineering, Environmental
Bang Du, Xinmin Zhan, Piet N. L. Lens, Yifeng Zhang, Guangxue Wu
Summary: Efficient anaerobic digestion relies on the cooperation of different microorganisms with different metabolic pathways. This study investigated the effects of different operational modes and the addition of powdered activated carbon (PAC) on ethanol metabolic pathways. The results showed that the SBR mode and the presence of CO2 facilitated ethanol metabolism towards propionate production, while the CFR mode with extended solids retention time enriched Geobacter. Adjusting operational modes and PAC addition can modulate anaerobic ethanol metabolism and enrich Geobacter.
Article
Engineering, Environmental
Wanfa Wang, Si-Liang Li, Jun Zhong, Yuanbi Yi, Fujun Yue, Zenglei Han, Qixin Wu, Ding He, Cong-Qiang Liu
Summary: This study compares the carbon biogeochemical processes in karst and non-karst regions within large thermal stratified river-reservoir systems. The results demonstrate that karst reservoirs have a reduced potential for carbon emissions and highlight the importance of considering geologic settings to improve accuracy in regional and global CO2 emission estimates.
Article
Engineering, Environmental
Chunxia Jiang, Zelong Zhao, Dong Zhu, Xiong Pan, Yuyi Yang
Summary: This study analyzed the occurrence and distribution of antibiotic resistance genes (ARGs) in different environmental media of the Yangtze River using metagenomics. Core resistome dominated by multidrug resistance genes was found in all samples, while rare resistome dominated by various resistance genes was more prevalent in plasmids. Specific bacteria were identified as hosts for both core and rare resistomes, with high clinical concern ARGs found in the rare resistome. Particle-associated environment provided the most ideal conditions for resistome hosts. This study provided insights into the genetic locations of ARGs and the community assembly mechanisms of ARG hosts in freshwater environments.
Article
Engineering, Environmental
Yu Zhang, Yongtao He, Linchun Jia, Lei Xu, Zheng Wang, Yueling He, Ling Xiong, Xumeng Lin, Hong Chen, Gang Xue
Summary: By synergizing organic carbon source, thiosulfate, and zero-valent iron, efficient mixotrophic denitrification of oligotrophic secondary effluent can be achieved. Thiosulfate plays a vital role in promoting TN removal efficiency, while corrosion of Fe0 releases OH- to neutralize H+ from thiosulfate-driven denitrification, creating a suitable environment for denitrification. The coordination of thiosulfate and Fe0 maintains the dominance of Thiobacillus for denitrification.