Review
Engineering, Environmental
Hongrui Xiang, Xiaobo Min, Chong-Jian Tang, Mika Sillanpaa, Feiping Zhao
Summary: This review introduces the advantages of membrane separation method for heavy metal removal and summarizes the latest developments and applications of ultrafiltration, nanofiltration, reverse osmosis, and electrodialysis. The results indicate that membrane filtration methods have great potential for heavy metal removal.
JOURNAL OF WATER PROCESS ENGINEERING
(2022)
Article
Engineering, Chemical
Mehdi Sedighi, Mohammad Mahdi Behvand Usefi, Ahmad Fauzi Ismail, Mostafa Ghasemi
Summary: Electrodialysis is a membrane separation method that utilizes an electrical potential difference to separate ions in aqueous solutions. It is used in various industries for water desalination, regeneration, and other applications. The process involves ion exchange membranes, electrodes, and spacers to achieve selective mass transport and create a potential difference. This study discusses different aspects of electrodialysis, including its application, structure, membrane types, electrode materials, spacers, and application in wastewater treatment.
Article
Multidisciplinary Sciences
Sayma Khanom, Nobuya Hayashi
Summary: In this study, zinc ions dissolved in water were attempted to be removed by generating zinc oxides using oxygen gas in a dielectric barrier discharge (DBD) plasma system. The removal rate of zinc oxides production was measured at different treatment periods, showing an initial increase followed by a decrease with treatment time. The optimal removal rate of zinc ions from water (29%) was achieved at a treatment period of 10 minutes, with a lower pH (7.4). The study indicates that controlling the penetration amount of active oxygens to keep the pH below 7.5 is crucial for effectively removing zinc ions and preventing a decrease in removal rate of zinc oxides' deposit.
SCIENTIFIC REPORTS
(2021)
Article
Engineering, Chemical
Aina Orell Regis, Johan Vanneste, Sarah Acker, Gisella Martinez, Juana Ticona, Vilma Garcia, Francisco D. Alejo, Julia Zea, Richard Krahenbuhl, Gary Vanzin, Jonathan O. Sharp
Summary: This study analyzed novel synergistic effects on rejection of arsenic and boron during membrane-based treatment. The research found that both reverse osmosis and nanofiltration membranes could meet WHO standards above pH 9 in contaminated waters, and increasing the pH from 7 to 9.5 doubled the allowable concentration of As(V) in the feed.
Article
Engineering, Chemical
O. S. L. Bruinsma, D. J. Branken, T. N. Lemmer, L. van der Westhuizen, S. Rossouw
Summary: Producing Na2SO4 in base metal refineries through electrodialysis and reverse osmosis offers an alternative solution to traditional energy-intensive methods. Understanding process phenomena and optimizing operating conditions are key factors in minimizing costs. The techno-economic analysis shows that the process not only reduces costs significantly but also provides a zero brine solution for reuse in the metal refinery.
Article
Engineering, Chemical
Jacek A. Wisniewski, Malgorzata Kabsch-Korbutowicz
Summary: This study explored the removal of harmful nitrates and bromates from water using ion exchange membranes. Donnan dialysis and electrodialysis processes showed satisfactory effects in removing these ions from aqueous solutions.
DESALINATION AND WATER TREATMENT
(2021)
Review
Biochemistry & Molecular Biology
Dennis Asante-Sackey, Sudesh Rathilal, Emmanuel Kweinor Tetteh, Elorm Obotey Ezugbe, Lingham V. Pillay
Summary: Donnan membrane processes (DMPs) are effective water treatment technologies that are suitable for wastewater treatment, metal separation, and concentration. They are not affected by conventional pressure-driven membrane technologies' fouling effects and have potential application prospects.
Article
Engineering, Environmental
Rui Ding, Ziyi Ding, Xiongjian Chen, Jianling Fu, Zijing Zhou, Xiao Chen, Xi Zheng, Yanchao Jin, Riyao Chen
Summary: The novel method of concentration electrodialysis (CED) effectively separates NH4+-N from high-salinity wastewater by combining conventional electrodialysis (ED) and Donnan dialysis (DD). CED achieved a high removal percentage of NH4+-N with low energy consumption and shorter processing time, showing potential for cost reduction and efficient treatment of wastewater.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Engineering, Chemical
Ridha Ben Mansour
Summary: Seawater reverse osmosis (SWRO) is a mature technology that has evolved significantly, but boron removal remains challenging. A new RO transport model combining irreversible thermodynamic theory and solution-diffusion theory was developed to address this issue. The model was validated and used to identify key parameters and assess their impact on SWRO performance. The results showed that the convective transport of boron through the seawater membrane significantly influenced water quality and energy consumption.
Article
Engineering, Chemical
Xin Zhang, Mingjie Wei, Yong Wang
Summary: The shape of pores plays a key role in the rejection of boron, with circular pores being most suitable for rejecting B(OH)3 molecules. Hydrophilic pores facilitate the rejection of B(OH)3 by impeding its passage with adsorbed water molecules inside the pores.
Article
Engineering, Chemical
P. Pazouki, J. P. S. Sidhu, D. S. Ipe, M. L. Pype, T. D. Wohlsen, F. Helfer, E. Bertone, R. A. Stewart
Summary: This study explored the feasibility of incorporating two low-energy dilution desalination processes into a conventional seawater desalination approach using real seawater and recycled wastewater. The results showed that mixing dilution of influent feed waters reduced the number of pathogenic contaminants and organic/inorganic compounds. The osmotic dilution desalination (ODD) process with the FO membrane was more effective in removing viruses and bacterial indicators compared to the mixing dilution desalination (MDD) process with the UF membrane.
Article
Biochemistry & Molecular Biology
Chulmin Lee, Yesol Kang, Dong-Ho Kim, In S. Kim
Summary: The WW-SW integrated RO process is gaining attention for its energy saving capability, economic benefits, and sustainability. One advantage is the reduction of boron concentration in the RO permeate, eliminating the need for post-treatment. Design constraints related to boron removal in the system have been explored, with a range of 15,000 to 20,000 mg/L feed found to be the most appropriate. Boron rejection tests with different membranes showed a critical reduction in rejection at pressures below 20 bar, emphasizing caution in using certain membranes in the integrated system.
Article
Biotechnology & Applied Microbiology
Boxian Chen, Fuzhi Li, Xuan Zhao
Summary: Novel polyamide reverse osmosis membranes and modules with high boron rejection were fabricated by cross-linked glutaric dialdehyde grafting in this study. The modified membranes became more hydrophilic, with an increase in boron rejection and a decrease in boron permeability coefficient. The modified module showed boron rejection over 90% within a certain concentration range and stabilized at approximately 90% beyond 3000 minutes.
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
(2021)
Article
Engineering, Environmental
Mariana Rodrigues, Malgorzata Roman, Annemiek ter Heijne, Tom Sleutels, Emile R. Cornelissen, Arne Verliefde, Cees J. N. Buisman, Philipp Kuntke
Summary: The presence of organic micropollutants (OMPs) can affect nutrient recovery systems. Combining an electrochemical system with membrane stripping can achieve total ammonium nitrogen (TAN) recovery from wastewater. Cation-exchange membranes and a hydrophobic gas-permeable membrane are essential components of these processes to separate OMPs from recovered products. This study provides a detailed description of the transport mechanism of a broad group of OMPs during electrochemical ammonium recovery, showing that positively charged OMPs have the highest removal and transport towards the concentrate.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2023)
Article
Biochemistry & Molecular Biology
Ikhlass Marzouk Trifi, Lobna Chaabane, Lasaad Dammak, Lassaad Baklouti, Bechir Hamrouni
Summary: The study focused on the removal of boron from aqueous solutions using Donnan dialysis and response surface methodology. The pH of the feed compartment was found to be the most important parameter influencing boron removal. By applying the Doehlert model, the optimum conditions were determined which led to an 88.8% removal rate when using the AFN membrane. The use of response surface methodology was shown to be more effective in determining optimal conditions compared to traditional methods.