Article
Engineering, Chemical
Maria Villen-Guzman, Carlos Jimenez, Jose Miguel Rodriguez-Maroto
Summary: The study found that Spirulina has higher removal capacity at pH 5.2 and lower adsorption capacity at higher ionic strength, suggesting ion exchange as a relevant mechanism. Immobilizing Spirulina on alginate beads not only increases adsorption capacity but also overcomes limitations in column systems. Dose-response model was the most appropriate to describe the biosorption process.
Article
Engineering, Chemical
Zulihumaer Aimaiti, Jing -Jing Yang, Turghun Muhammad, Anaerguli Wufuer, Almire Dolkun, Xing Fan
Summary: This study investigates the correlation between the adsorption capacities of batch and fixed bed processes and finds a significant correlation between the two. The findings have important implications for the mathematical modeling and selection of appropriate processes in water pollutant treatment.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2022)
Article
Environmental Sciences
Hugo Bacelo, Silvia C. R. Santos, Andreia Ribeiro, Rui A. R. Boaventura, Cidalia M. S. Botelho
Summary: Antimony is naturally present in water, but can also be mobilized by human activities like mining. This study focused on removing Sb(III) and Sb(V) using a resin made from pine bark tannins, showing good adsorption capacities. The tannin resin demonstrated stability and efficiency in removing antimony, even in the presence of high sulfate levels and moderate interference from coexisting metal cations.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2022)
Article
Engineering, Chemical
Pedro Hernandez, Gonzalo Recio, Christian Canales, Alex Schwarz, Denys Villa-Gomez, Gordon Southam, Ivan Nancucheo
Summary: In this study, a mixed culture fixed-film column bioreactor was used to remove sulfate from acidic synthetic water containing zinc. By adjusting the hydraulic retention time and glycerol concentration, the removal efficiency of sulfate was improved.
MINERALS ENGINEERING
(2022)
Article
Engineering, Environmental
Oputu Ogheneochuko, Ntshoko Zintle, Fester Veruscha
Summary: Sustainable waste management practices involve utilizing renewable resources for waste disposal. This study found that waste derived from pineapple can be used as a biosorbent for removing cobalt ions from water. Batch and column studies showed that modified pineapple waste exhibited good removal performance. Kinetic and equilibrium data were best described by the pseudo-second-order and Freundlich isotherm, respectively, while column data fitted well with the Yoon Nelson model. Thomas's model successfully described the behavior of the pineapple waste in removing cobalt ions from real wastewater.
JOURNAL OF WATER PROCESS ENGINEERING
(2022)
Article
Materials Science, Paper & Wood
Lingyu Zeng, Yecan Peng, Guirong Ye, Xiaona Shang, Shuangfei Wang, Jinghong Zhou
Summary: This study investigates the adsorption of substances contributing to COD in secondary treated effluents of pulp and paper mills using CoFe2O4 and quartz sand-coated CoFe2O4. The experiments demonstrate that CoFe2O4-coated sand has good adsorption performance and stability. Results show that an increase in feed flow rate and initial pH can decrease breakthrough time, while an increase in bed depth can increase breakthrough time.
Article
Engineering, Chemical
Mohammadhossein Safardastgerdi, Faramarz Doulati Ardejani, Niyaz Mohammad Mahmoodi
Summary: This work introduces new chelating materials based on lignocellulosic biomass from Gundelia Tournefortii (GT). The modified GT showed enhanced adsorption capability for contaminants, such as Cu (II) and dye. The results suggest that the functionalized GT has great potential for removing pollutants and can be a promising adsorbent.
MINERALS ENGINEERING
(2023)
Article
Agricultural Engineering
Uplabdhi Tyagi
Summary: The study highlights the potential of Vetiveria Zizanioides derived biochar for heavy metal removal in multicomponent systems. Biochar efficiency varies with pH, metal ion concentration and residence time. Fixed-bed column testing showed that multicomponent sequence provides more protection against premature exhaustion of biochar.
BIORESOURCE TECHNOLOGY
(2022)
Review
Environmental Sciences
H. Patel
Summary: Adsorption is widely used for pollutant removal due to its potential advantages such as cost-effectiveness and convenience. This study focuses on comparing various adsorption processes and evaluating their adsorption capacity and removal efficiency. It concludes that column adsorption may be more feasible than batch processes.
INTERNATIONAL JOURNAL OF ENVIRONMENTAL SCIENCE AND TECHNOLOGY
(2022)
Article
Environmental Sciences
Diego Juela, Mayra Vera, Christian Cruzat, Ximena Alvarez, Eulalia Vanegas
Summary: In this study, the dynamic behavior of sulfamethoxazole adsorption on sugarcane bagasse was studied and compared using analytical models and a theoretical mechanistic model. The Log-Gompertz model showed the best agreement with experimental data, while the mechanistic model accurately predicted breakthrough curves and estimated relevant parameters. Increasing global mass transfer coefficient (K-i) resulted in a faster adsorption rate, and high axial dispersion coefficient (D-z) values led to lower adsorption capacities of the adsorbent, highlighting the importance of axial dispersion in sulfamethoxazole adsorption on sugarcane bagasse.
Article
Environmental Sciences
Na Lv, Xiufen Li
Summary: The study investigated the adsorption of phosphorus in low-concentration phosphorus wastewater using a modified calcium-modified attapulgite (Ca-GAT). The study explored the effects of various parameters on dynamic phosphorus adsorption and found that the adsorption ability improved with increased bed height and flow rate, and decreased initial phosphorus concentration. Breakthrough curves were fitted using four models, with the Thomas model determining a maximum adsorption amount of 13.477 mg/g. The study also found that NaOH regeneration had the best effect, and the breakthrough point was achieved after 177 hours in treating actual MBR effluent. These findings suggest that Ca-GAT has potential for the treatment of low-concentration phosphorus wastewater.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2023)
Article
Environmental Sciences
Welenilton Jose do Nascimento Jr, Giovane Henrique de Aguiar, Renan Costa Massarelli, Richard Landers, Melissa Gurgel Adeodato Vieira, Mauricio Alves da Motta Sobrinho
Summary: This study evaluated the potential of alginate-extracted macro-algae waste in adsorbing synthetic dyes and metal cations. The results showed that the adsorption performance of algae waste was slightly better than raw algae in batch experiments, and it exhibited higher efficiency in continuous biosorption operation.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Engineering, Chemical
Krzysztof Szostak, Gabriela Hodacka, Jolanta Pulit-Prociak, Marcin Banach
Summary: This paper presents a methodology for preparing hydrochar from waste materials and investigates its efficacy in removing mercury ions from water. The study found that the obtained hydrochar has excellent sorption properties and can efficiently remove mercury ions from aqueous solutions.
Article
Environmental Sciences
Patricia Trevisani Juchen, Marcia Teresinha Veit, Gilberto da Cunha Goncalves, Soraya Moreno Palacio, Jacqueline Ferandin Honorio, Pedro Yahico Ramos Suzaki
Summary: The fixed-bed column biosorption process using malt bagasse was studied to evaluate dye biosorption capacity and obtain mass transfer parameters. The Langmuir isotherm was used to represent equilibrium data, and a mathematical model considering internal diffusion resistance accurately predicted the dynamic behavior of the biosorption column operation.
WATER AIR AND SOIL POLLUTION
(2021)
Article
Environmental Sciences
Patricia Grassi, Fernanda Caroline Drumm, Jordana Georgin, Dison Stracke Pfingsten Franco, Guilherme Luiz Dotto, Edson Luiz Foletto, Sergio Luiz Jahn
Summary: In this study, Cordia trichotoma sawdust was utilized as a biosorbent for crystal violet removal, with optimal conditions and models determined. The experimental results demonstrate the high adsorption capacity of Cordia trichotoma sawdust for effective color removal from dye wastewater.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2021)
Article
Chemistry, Physical
Maria Harja, Carmen Teodosiu, Dorina Nicolina Isopescu, Osman Gencel, Doina Lutic, Gabriela Ciobanu, Igor Cretescu
Summary: Fly ash wastes can be effectively used in concrete formulation as a replacement for cement, by undergoing an alkali activation process. The study investigated the relationship between the processing conditions, particle characteristics, and compressive strength values of the concrete. The results showed that the processed fly ash can be a suitable potential building material, solving waste disposal issues and reducing cement consumption.
Article
Environmental Sciences
Roxana Zait, Brindusa Sluser, Daniela Fighir, Oana Plavan, Carmen Teodosiu
Summary: The Integrated Water Resources Management regulations aim to ensure good surface water quality and its sustainable use. This study monitored priority organic and inorganic pollutants in the Siret River basin in Romania, assessing the water quality status and evaluating it using the Water Quality Index method. The results showed that the water quality in the Siret River basin is generally classified as the second or third class.
Article
Green & Sustainable Science & Technology
Giovanni Gadaleta, Sabino De Gisi, Francesco Todaro, Vincenzo Campanaro, Carmen Teodosiu, Michele Notarnicola
Summary: Using a Multi-Criteria Decision Analysis method, this study evaluated and compared the sustainability of different waste management schemes, finding that the door-to-door system is the best solution in environmental and socio-technical terms, despite its higher cost. Interestingly, there is limited deviation between the mixed collection mode and the door-to-door system, suggesting strong competitiveness of the former.
SUSTAINABLE PRODUCTION AND CONSUMPTION
(2022)
Article
Green & Sustainable Science & Technology
Ramona Ciobanu, Carmen Teodosiu, Cecilia M. V. B. Almeida, Feni Agostinho, Biagio Fernando Giannetti
Summary: Water and wastewater treatment plants are essential for providing drinking water and treating effluents, but studies on their investments and sustainability are limited. This study evaluates a wastewater treatment plant in Iasi, Romania using the emergy approach and considers the environmental costs of natural fluxes. The sustainability is assessed through the emergy yield ratio, environmental load rate, and emergy sustainability development index. The study finds that local renewable resources play a small role in wastewater treatment compared to purchased resources mainly supported by fossil fuels.
Article
Green & Sustainable Science & Technology
George Barjoveanu, Florenta Dinita, Carmen Teodosiu
Summary: This study investigates the impact of technological changes on the lifespan of personal car fleets in Romania and assesses the environmental performance and evolution of the passenger car fleet. The results suggest that limiting second-hand imports and promoting electric and hybrid vehicles can mitigate environmental impacts.
Article
Food Science & Technology
Georgiana-Diana Dumitriu Gabur, Iulian Gabur, Elena Iulia Cucolea, Teodor Costache, Dan Rambu, Valeriu V. Cotea, Carmen Teodosiu
Summary: This study analyzed the pesticide residues in wines and found that the concentrations of pesticide residues in these samples do not pose any immediate risk to consumers. However, pesticide residue intake has been associated with health problems, making it crucial to monitor their presence in horticultural crops for clean and safe food products and healthy consumers.
Article
Environmental Sciences
Arno P. Clasen, Feni Agostinho, Carmen Teodosiu, Cecilia M. V. B. Almeida, Biagio F. Giannetti
Summary: Further advances in understanding the food, energy and water (FEW) nexus are needed, particularly in supporting small-scale public policies. This study proposes the FEW nexus cube model, which quantitatively and integratively evaluates the FEW nexus of municipalities. The model identifies strengths and weaknesses of each municipality based on independently quantified FEW flows represented in a 3-D cube. Application of the cube model in nine Brazilian municipalities demonstrates its potential for comparative assessments.
ENVIRONMENTAL SCIENCE & POLICY
(2022)
Article
Environmental Sciences
Irina Morosanu, Carmen Paduraru, Florin Bucatariu, Daniela Fighir, Marcela Mihai, Carmen Teodosiu
Summary: The design of core/shell composite microparticles for loading/release of organic/inorganic pollutants in wastewater treatment is an important area of research. A new approach that allows for higher organic shell amounts in a single deposition step with less material and energy consumption and without the formation of toxic by-products has been presented in this study. The study also investigated the effects of deposition method, polyanion nature, and crosslinking ratio on the sorption performance of the composite sorbents.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2022)
Article
Environmental Sciences
Roxana Zait, Daniela Fighir, Brindusa Sluser, Oana Plavan, Carmen Teodosiu
Summary: Water management is an international concern, and this study aims to assess the ecological and health hazards of priority pollutants in the Siret river basin. The results reveal significant environmental impact and a high level of risk exposure in the monitored river sections.
Review
Biochemistry & Molecular Biology
Samuel Tucker, Georgiana-Diana Dumitriu (Gabur), Carmen Teodosiu
Summary: The use of pesticides is essential in modern times, as they contribute to the profitable pesticide market. However, the presence of toxic compounds in food, drink, and air poses potential risks to human health. Identifying and quantifying these hazardous substances are crucial for sustainable development and agricultural production systems. This review summarizes the analytical methods for pesticide extraction and determination, along with discussing sustainable viticulture practices.
Article
Polymer Science
Irina Morosanu, Florin Bucatariu, Daniela Fighir, Carmen Paduraru, Marcela Mihai, Carmen Teodosiu
Summary: The direct deposition of weak cationic polyelectrolytes on inorganic surfaces through precipitation is a fast method for producing composites with numerous functional groups. These core/shell composites exhibit excellent sorption capacity for heavy metal ions and negatively charged organic molecules in aqueous media. The adsorption of lead ions and diclofenac sodium salt depends on the organic content of the composite and is less affected by the nature of contaminants due to different retention mechanisms. Two experimental approaches, simultaneous adsorption from a binary mixture and sequential retention from monocomponent solutions, were investigated. Additionally, process optimization using the central composite design methodology was carried out to study the effects of contact time and initial solution acidity. The suitability of silica/polyelectrolytes as efficient sorbents for wastewater treatment was demonstrated through sorbent regeneration and the fitting of isotherm and kinetics models.
Article
Chemistry, Multidisciplinary
George Barjoveanu, Carmen Teodosiu, Irina Morosanu, Ramona Ciobanu, Florin Bucatariu, Marcela Mihai
Summary: This study compared the environmental performances of two synthesis strategies for polyethyleneimine (PEI) coated silica particles (organic/inorganic composites) through life cycle assessment (LCA). The classic layer-by-layer and the new approach (one-pot coacervate deposition) were tested for removing cadmium ions from aqueous solutions. The results showed that the one-pot coacervate synthesis route had significantly lower environmental impacts than the layer-by-layer technique. Additionally, the study demonstrated the usefulness of LCA and scenario analysis in identifying environmental hotspots and improvement possibilities in material development.
Article
Green & Sustainable Science & Technology
Daniela Gavrilescu, Bogdan-Constantin Seto, Carmen Teodosiu
Summary: This study analyzed the sustainability impact of packaging waste using multiple data sources and indicators. The results showed that the EFA scenario had the lowest environmental impact and the highest positive socio-economic indicators for the overall packaging waste system.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Environmental Sciences
George Barjoveanu, Giovanni Gadaleta, Giusy Santomasi, Sabino De Gisi, Michele Notarnicola, Carmen Teodosiu
Summary: The management of PET trays waste poses challenges for recycling PET bottles. This study evaluates the environmental and economic sustainability of sorting PET trays from plastic waste streams. Alternative scenarios showed limited environmental benefits, with overall impacts 10% lower than the current scenario but significant differences in climate and ozone depletion. Upgraded scenarios achieved slightly lower costs (<2%) by avoiding fines for PET trays contamination. Implementing technology upgrades for PET sorting through optical sorting is both environmentally and economically viable.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Chemistry, Multidisciplinary
Florin Bucatariu, Larisa-Maria Petrila, Carmen Teodosiu, Marcela Mihai
Summary: Linear and branched poly(ethyleneimines) and poly(acrylic acid) were used to construct nanostructured thin organic shells on silica microparticles, with selective removal of polyanionic chains to enhance sorption performance. The extracted composites showed the best sorption capacity for gallic acid, and demonstrated reusability in at least 10 consecutive cycles without significant loss of sorption capacity.
COMPTES RENDUS CHIMIE
(2022)
