Read by QxMD icon Read


Zhujian Huang, Beini Gong, Chin-Pao Huang, Shu-Yuan Pan, Pingxiao Wu, Zhi Dang, Pen-Chi Chiang
Emerging pollutants introduced into surface water pose potential hazards to the safety of drinking water. In this study, the removal performance of three emerging compounds (exemplified by caffeine, diclofenac and octylphenol, with different physico-chemical properties) from synthetic water and source water by combining activated carbon (AC) adsorption and nanofiltration (NF) membrane processes was evaluated and analyzed. Results from synthetic water showed that the adsorption isotherms modeled well with the Langmuir equation...
October 16, 2018: Journal of Environmental Management
Lars Regestein, Tobias Klement, Philipp Grande, Dirk Kreyenschulte, Benedikt Heyman, Tim Maßmann, Armin Eggert, Robert Sengpiel, Yumei Wang, Nick Wierckx, Lars M Blank, Antje Spiess, Walter Leitner, Carsten Bolm, Matthias Wessling, Andreas Jupke, Miriam Rosenbaum, Jochen Büchs
Renewable raw materials in sustainable biorefinery processes pose new challenges to the manufacturing routes of platform chemicals. Beside the investigations of individual unit operations, the research on process chains, leading from plant biomass to the final products like lactic acid, succinic acid, and itaconic acid is increasing. This article presents a complete process chain from wooden biomass to the platform chemical itaconic acid. The process starts with the mechanical pretreatment of beech wood, which subsequently is subjected to chemo-catalytic biomass fractionation (OrganoCat) into three phases, which comprise cellulose pulp, aqueous hydrolyzed hemicellulose, and organic lignin solutions...
2018: Biotechnology for Biofuels
Maria Alexandri, Roland Schneider, Joachim Venus
Lactic acid (LA) was produced on a pilot scale using a defined medium with glucose, acid whey, sugar bread and crust bread. The fermentation broths were then subjected to micro- and nanofiltration. Microfiltration efficiently separated the microbial cells. The highest average permeate flow flux was achieved for the defined medium (263.3 L/m²/h) and the lowest for the crust bread-based medium (103.8 L/m²/h). No LA losses were observed during microfiltration of the acid whey, whilst the highest retention of LA was 21...
October 12, 2018: Membranes
Sun-Jie Xu, Qian Shen, Gui-E Chen, Zhen-Liang Xu
Organic solvent nanofiltration (OSN) membranes are always troubled by the "trade-off" effect between solvent flux and solute rejection. Hence, a rapid, convenient, and effective way to synthesize novel β-cyclodextrin-enhanced zeolite imidazole framework-8 (β-CD@ZIF-8) nanoparticles was first proposed and the nanoparticles were doped into both selective layer and poly( m -phenylene isophthalamide) support for fabricating thin-film nanocomposite membranes. Transmission/scanning electron microscopy images and X-ray photoelectron spectroscopy results demonstrate the successful synthesis of β-CD@ZIF-8...
September 30, 2018: ACS Omega
Siu On Tung, Sydney L Fisher, Nicholas A Kotov, Levi T Thompson
Redox flow batteries are attractive for large-scale energy storage due to a combination of high theoretical efficiencies and decoupled power and energy storage capacities. Efforts to significantly increase energy densities by using nonaqueous electrolytes have been impeded by separators with low selectivities. Here, we report nanoporous separators based on aramid nanofibres, which are assembled using a scalable, low cost, spin-assisted layer-by-layer technique. The multilayer structure yields 5 ± 0.5 nm pores, enabling nanofiltration with high selectivity...
October 10, 2018: Nature Communications
Die Ling Zhao, Tai-Shung Chung
Carbon quantum dots (CQDs), which are a fascinating class of nanostructured carbons, have recently attracted extensive attention in the field of membrane technologies for their applications in separation processes. This is because they possess two unique advantages. Their productions are facile and inexpensive, while their physicochemical properties such as ultra-small sizes, good biocompatibility, high chemical inertness, tunable hydrophilicity, rich surface functional groups and antifouling characteristics are highly desirable...
September 27, 2018: Water Research
Alejandro Gallego-Schmid, Raphael Ricardo Zepon Tarpani, Sara Miralles-Cuevas, Alejandro Cabrera-Reina, Sixto Malato, Adisa Azapagic
Scarcity of water and concerns about the ecotoxicity of micro-contaminants are driving an interest in the use of advanced tertiary processes in wastewater treatment plants. However, the life cycle environmental implications of these treatments remain uncertain. To address this knowledge gap, this study evaluates through life cycle assessment the following four advanced process options for removal of micro-contaminants from real effluents: i) solar photo-Fenton (SPF) operating at acidic pH; ii) acidic SPF coupled with nanofiltration (NF); iii) SPF operating at neutral pH; and iv) neutral SPF coupled with NF...
October 1, 2018: Science of the Total Environment
Digambar B Shinde, Guan Sheng, Xiang Li, Mayur Ostwal, Abdul-Hamid Emwas, Kuo-Wei Huang, Zhiping Lai
Two-dimensional (2D) covalent organic framework (COF) materials have the most suitable microstructure for membrane applications in order to achieve both high flux and high selectivity. Here, we report the synthesis of a crystalline TFP-DHF 2D COF membrane constructed from two precursors of 1,3,5-triformylphloroglucinol (TFP) and 9,9-dihexylfluorene-2,7-diamine (DHF) through the Langmuir-Blodgett (LB) method, for the first time. A single COF layer is precisely four-unit-cell thick and can be transferred to different support surfaces layer-by-layer...
October 5, 2018: Journal of the American Chemical Society
Qin Liu, Xing Wu, Kaisong Zhang
To improve the filtration performance and properties of organic solvent nanofiltration (OSN) membranes, we firstly introduce nanoporous silica (SiO₂) particles into the polyamide (PA) active layer of polysulfone (PSf) membrane via an interfacial polymerization process. Results from the study revealed that introduction of SiO₂ influenced the properties of PSf/PA-SiO₂ composite membranes by changing the surface roughness and hydrophilicity. Moreover, results also indicated that nanoporous SiO₂ modified membranes showed an improved performance of alcohols solvent permeance...
October 3, 2018: Membranes
Yi-Li Lin, Jia-Zheng Tsai, Chung-Hsuang Hung
A commercially available nanofiltration membrane, NF90, was modified using an in situ concentration polarization-enhanced radical graft polymerization method to improve the organic fouling resistance as well as the removal of pharmaceutical and personal care products (PPCPs), including ibuprofen (IBU), carbamazepine, sulfadiazine, sulfamethoxazole, sulfamethazine, and triclosan (TRI). 3-Sulfopropyl methacrylate potassium salt (SPM) and 2-hydroxyethyl methacrylate (HEMA) were used in various dosages for surface modification, and the extent of membrane modifications was quantified based on the degree of grafting...
September 27, 2018: Environmental Science and Pollution Research International
Muhammad B Asif, Ashley J Ansari, Shiao-Shing Chen, Long D Nghiem, William E Price, Faisal I Hai
High retention membrane bioreactors (HR-MBR) combine a high retention membrane separation process such as membrane distillation, forward osmosis, or nanofiltration with a conventional activated sludge (CAS) process. Depending on the physicochemical properties of the trace organic contaminants (TrOCs) as well as the selected high retention membrane process, HR-MBR can achieve effective removal (80-99%) of a broad spectrum of TrOCs. An in-depth assessment of the available literature on HR-MBR performance suggests that compared to CAS and conventional MBRs (using micro- or ultra-filtration membrane), aqueous phase removal of TrOCs in HR-MBR is significantly better...
September 27, 2018: Environmental Science and Pollution Research International
Yandi Lan, Karine Groenen-Serrano, Clémence Coetsier, Christel Causserand
Treatment combining membrane bioreactors (MBR) and nanofiltration (NF) is becoming an emerging wastewater treatment strategy. The combined process is capable of producing high quality water potentially reusable; however, diverse compositions of MBR effluents induce several types and degrees of NF membrane fouling that impacts process productivity. Moreover, since MBR effluent composition for one type of wastewater source is variable depending on the MBR efficiency at different periods, downstream NF membrane fouling types and degrees may consequently change over time...
September 10, 2018: Water Research
Borte Kose Mutlu, Hale Ozgun, Mustafa Evren Ersahin, Recep Kaya, Selvihan Eliduzgun, Mahmut Altinbas, Cumali Kinaci, Ismail Koyuncu
Biomass characteristics may change subject to a salinity increase when treating high strength wastewater. In this study, the impact of salinity in a membrane bioreactor (MBR) was investigated for the treatment of produced water (PW). MBR was operated as a pre-treatment prior to nanofiltration (NF) and reverse osmosis (RO). Mixed PW, that was originated from different oil, gas, and oil-gas wells, were subjected to pre-treatment for 146 days including three different operational phases: Low-salinity (~10 mS/cm), gradual increased salinity (10-40 mS/cm) and high salinity (~40 mS/cm)...
January 1, 2019: Science of the Total Environment
Eduardo Coutinho de Paula, Poliana Vicente Martins, Isabella Coelho de Melo Ferreira, Míriam Cristina Santos Amaral
Recycling of end-of-life polyamide-based thin film composite (TFC) membranes is gaining interest in academic and industrial contexts. The effects of chlorine exposure on the performance of polyamide membranes result in an increase in membrane permeability, whereas the solute rejection decreases. Therefore, the controlled chemical conversion of old reverse osmosis (RO) membranes has been reported by some previous papers. The objectives of this study were to assess recycling of old nanofiltration (NF) membrane, to assess the performance of the recycled membranes for a river water treatment application, and to conduct preliminary cost evaluations...
September 18, 2018: Environmental Technology
Chad M Gilmer, Ned B Bowden
This article reports the fabrication of organic solvent nanofiltration membranes containing a labile disulfide bond, which is broken by reaction with a chemical stimulus. These membranes are a new generation of smart membranes that have tailored selectivities and flux that can be altered by reacting with a chemical stimulus. The selectivity and flux of chemicals through the membranes was controlled by varying the concentration of disulfide bonds in the membrane. When the disulfide bonds were cleaved, the pores in the membrane became larger and yielded different separation properties...
August 31, 2018: ACS Omega
David Cetlin, Melanie Pallansch, Coral Fulton, Esha Vyas, Aesha Shah, Taka Sohka, Arun Dhar, Luke Pallansch, Daniel Strauss
Viruses can arise during the manufacture of biopharmaceuticals through contamination or endogenous expression of viral sequences. Regulatory agencies require "viral clearance" validation studies for each biopharmaceutical prior to approval. These studies aim to demonstrate the ability of the manufacturing process at removing or inactivating virus and are conducted by challenging scaled-down manufacturing steps with a "spike" of live virus. Due to the infectious nature of these live viruses, "spiking studies" are typically conducted in specialized biological safety level-2 facilities...
September 2018: Biotechnology Progress
Langming Bai, Yatao Liu, Nathan Bossa, An Ding, Nanqi Ren, Guibai Li, Heng Liang, Mark R Wiesner
To achieve greater separation performance and antifouling properties in a thin-film composite (TFC) nanofiltration membrane, cellulose nanocrystals (CNCs) were incorporated into the polyamide layer of a TFC membrane for the first time. The results of Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy (XPS) confirmed the successful formation of the CNC-polyamide composite layer. Surface characterization results revealed differences in the morphologies of the CNC-TFC membranes compared with a control membrane (CNC-TFC-0)...
October 2, 2018: Environmental Science & Technology
Maryam Haddad, Takashi Ohkame, Pierre R Bérubé, Benoit Barbeau
Groundwater (GW) is one of the most abundant water resources and around 1.5 billion people rely on GW as their main water supply. Manganese (Mn) and iron (Fe) are very common GW contaminants. Even though their presence is considered mainly as an organoleptic and operational nuisance, water with elevated Mn content may also lead to adverse health impacts. Amongst the most common treatment processes currently used to treat domestic GW supplies: catalytic filtration may lead to Mn leaching if improperly maintained; while ion exchange consumes a considerable amount of salt and produces a brine waste which pollutes the environment...
August 22, 2018: Water Research
Chun-Hai Wei, Nan Wang, Christiane HoppeJones, TorOve Leiknes, Gary Amy, Qian Fang, Xiaodong Hu, Hongwei Rong
The removal of 26 organic micropollutants (OMPs) in synthetic municipal wastewater was investigated via the process of aerobic sequential batch reactor (SBR) alone and SBR followed by nanofiltration (NF). SBR-NF performed better than SBR alone, ascribed to the contribution of NF: 1) complete biomass rejection resulted in diverse microbial community and much less fluctuated performance than SBR alone, and 2) direct OMPs rejection (74-98%) increased their retention time in SBR and thus overall removal via biodegradation/transformation and accumulation in SBR...
November 2018: Bioresource Technology
Jinkai Xue, Bing Guo, Zhanyang Gong
This review covers research articles published in 2017 on topics relating to physico-chemical processes for water and wastewater treatment. The paper divides into nine sections, i. e., membrane technology, ion exchange, capacitive deionization, granular filtration, coagulation/flocculation, sedimentation, flotation, oxidation and adsorption. The membrane technology part includes six parts, including microfiltration (MF), ultrafiltration (UF), nanofiltration (NF), reverse osmosis (RO), forward osmosis (FO), and membrane distillation (MD)...
October 1, 2018: Water Environment Research: a Research Publication of the Water Environment Federation
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"