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https://www.readbyqxmd.com/read/28546028/evaluation-and-control-of-microbial-and-chemical-contamination-in-dialysis-water-plants-of-italian-nephrology-wards
#1
Michele Totaro, Beatrice Casini, Paola Valentini, Mario Miccoli, Serena Giorgi, Andrea Porretta, Gaetano Privitera, Pier Luigi Lopalco, Angelo Baggiani
BACKGROUND: Patients receiving haemodialysis are exposed to a large volume of dialysis fluid. The Italian Society of Nephrology (ISN) published guidelines and microbial quality standards on dialysis water (DW) and solutions to ensure patient safety. AIM: Aim of the study was to identify microbial and chemical hazards and to evaluate disinfection treatments quality in DW plants. METHODS: In the years 2015 and 2016 water networks and DW plants (closed loop and online monitors) of nine dialysis wards of Italian hospitals, hosting 162 dialysis beds overall, were sampled on a monthly basis to determine the parameters provided by ISN guidelines...
May 22, 2017: Journal of Hospital Infection
https://www.readbyqxmd.com/read/28540548/influence-of-surface-properties-of-ro-membrane-on-membrane-fouling-for-treating-textile-secondary-effluent
#2
Zhonglong Yin, Cheng Yang, Chao Long, Aimin Li
Reverse osmosis (RO) is a promising technology for treating and reusing textile secondary effluent (SE). To better understand the effect of membrane surface properties on membrane fouling, the performances of three commercial polyamide thin-film composite RO membranes (BW30-4040, CPA2-4040, and RE-4040-FEN) with different roughness and hydrophilicity were investigated for treating textile SE. The RO membranes were characterized by ATR-FTIR, SEM, AFM, and contact angle, respectively. The results showed that the flux increased with an increase in the surface hydrophilicity of membrane...
May 24, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28537710/elucidating-adsorptive-fractions-of-natural-organic-matter-on-carbon-nanotubes
#3
Mohamed Ateia, Onur G Apul, Yuta Shimizu, Astri Muflihah, Chihiro Yoshimura, Tanju Karanfil
Natural organic matter (NOM) is a heterogeneous mixture of organic compounds that is omnipresent in natural waters. To date, our understanding of NOM components' adsorption by carbon nanotubes (CNTs) is limited due to limited number of comprehensive studies in the literature examining the adsorption of NOM by CNTs. In this study, eleven standard NOMs from various sources were characterized, and their adsorption on four different CNTs were examined side-by-side using total organic carbon, fluorescence, UV-visible spectroscopy, and high performance size exclusion chromatography (HPSEC) analysis...
May 24, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28531853/methane-production-in-an-anaerobic-osmotic-membrane-bioreactor-using-forward-osmosis-effect-of-reverse-salt-flux
#4
Sheng Li, Youngjin Kim, Sherub Phuntsho, Laura Chekli, Ho Kyong Shon, TorOve Leiknes, Noreddine Ghaffour
This study investigated the impact of reverse salt flux (RSF) on microbe community and bio-methane production in a simulated fertilizer driven FO-AnMBR system using KCl, KNO3 and KH2PO4 as draw solutes. Results showed that KH2PO4 exhibited the lowest RSF in terms of molar concentration 19.1mM/(m(2).h), while for KCl and KNO3 it was 32.2 and 120.8mM/(m(2).h), respectively. Interestingly, bio-methane production displayed an opposite order with KH2PO4, followed by KCl and KNO3. Pyrosequencing results revealed the presence of different bacterial communities among the tested fertilizers...
May 10, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28530326/-serum-thyroglobulin-levels-and-estimated-iodine-intake-in-adults-exposed-to-iodine%C3%A2-diluted-desalinated-drinking-water
#5
Dov Gefel, Svetlana Turkot, Dorit Aharoni, Shlomo Fytlovich, Yaniv S Ovadia
AIMS: The aim of this study was to describe thyroglobulin levels and iodine intake estimations in a convenience sample of Israeli adults without TD in the Ashkelon District, where SWRO desalination has become the major source of drinking water. BACKGROUND: Iodine deficiency (ID) is a significant risk factor for thyroid disease (TD). Recently, there were increases in both selfreported use of TD medication among Israeli adults and the national use of sea water reverse osmosis (SWRO) desalinated water...
August 2016: Harefuah
https://www.readbyqxmd.com/read/28527139/exploration-of-an-innovative-draw-solution-for-a-forward-osmosis-membrane-distillation-desalination-process
#6
Nguyen Cong Nguyen, Shiao-Shing Chen, Shubham Jain, Hau Thi Nguyen, Saikat Sinha Ray, Huu Hao Ngo, Wenshan Guo, Ngoc Tuan Lam, Hung Cong Duong
Forward osmosis (FO) has emerged as a viable technology to alleviate the global water crisis. The greatest challenge facing the application of FO technology is the lack of an ideal draw solution with high water flux and low reverse salt flux. Hence, the objective of this study was to enhance FO by lowering reverse salt flux and maintaining high water flux; the method involved adding small concentrations of Al2(SO4)3 to a MgCl2 draw solution. Results showed that 0.5 M MgCl2 mixed with 0.05 M of Al2(SO4)3 at pH 6...
May 19, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28521239/seabed-gallery-intakes-investigation-of-the-water-pretreatment-effectiveness-of-the-active-layer-using-a-long-term-column-experiment
#7
Abdullah H A Dehwah, Thomas M Missimer
Seabed gallery intake systems used for seawater reverse osmosis facilities employ the same principle of water treatment as slow sand filtration in freshwater systems. An investigation concerning the effectiveness of the active layer (top layer) in improving raw water quality was conducted by using a long-term bench-scale columns experiment. Two different media types, silica and carbonate sand, were tested in 1 m columns to evaluate the effectiveness of media type in terms of algae, bacteria, Natural Organic Matter (NOM) and Transparent Exopolymer Particles (TEP) removal over a period of 620 days...
May 10, 2017: Water Research
https://www.readbyqxmd.com/read/28514901/fixed-bed-study-for-bone-char-adsorptive-removal-of-refractory-organics-from-electrodialysis-concentrate-produced-by-petroleum-refinery
#8
Patrícia da Luz Mesquita, Cássia Ribeiro Souza, Nilza Tatiane G Santos, Sônia Denise Ferreira Rocha
Water reuse in industrial processes has been an increasing need encouraged in recent years. However, as the streams are recycled, solutes accumulate, thus requiring purification techniques. Membrane processes (reverse osmosis and electrodialysis) have been implemented and in order to increase the reuse of water at its highest level, crystallization has been evaluated to remove salts from the concentrate produced and get a feasible disposal. Nevertheless, contaminants affect the crystallization performance, thus making the removal of residual organics important for both, the efficiency of crystallization as well as the increase of water reuse...
May 17, 2017: Environmental Technology
https://www.readbyqxmd.com/read/28491136/applications-of-microalgal-biofilms-for-wastewater-treatment-and-bioenergy-production
#9
Ana F Miranda, Narasimhan Ramkumar, Constandino Andriotis, Thorben Höltkemeier, Aneela Yasmin, Simone Rochfort, Donald Wlodkowic, Paul Morrison, Felicity Roddick, German Spangenberg, Banwari Lal, Sanjukta Subudhi, Aidyn Mouradov
BACKGROUND: Microalgae have shown clear advantages for the production of biofuels compared with energy crops. Apart from their high growth rates and substantial lipid/triacylglycerol yields, microalgae can grow in wastewaters (animal, municipal and mining wastewaters) efficiently removing their primary nutrients (C, N, and P), heavy metals and micropollutants, and they do not compete with crops for arable lands. However, fundamental barriers to the industrial application of microalgae for biofuel production still include high costs of removing the algae from the water and the water from the algae which can account for up to 30-40% of the total cost of biodiesel production...
2017: Biotechnology for Biofuels
https://www.readbyqxmd.com/read/28485119/case-of-mycobacterium-mucogenicum-in-home-hemodialysis-patient
#10
Miten J Dhruve, Paul E Bunce, Celine D'Gama, Christopher T Chan
We present a case of a patient on home hemodialysis who developed Mycobacterium mucogenicum bacteremia. While infections with this particular organism are rare, disseminated infections have been reported and have been associated with significant morbidity and mortality. Diagnosis required appropriate cultures, understanding of natural habitat of organism and complete environmental analysis including blood, dialysis sample port, reverse osmosis and incoming water supply cultures. The patient was treated successfully with systemic antibiotics, removal of central venous catheter, patient education and complete exchange of the hemodialysis circuit...
May 9, 2017: Hemodialysis International
https://www.readbyqxmd.com/read/28479085/co-digestion-performance-of-organic-fraction-of-municipal-solid-waste-with-leachate-preliminary-studies
#11
Huseyin Guven, Mehmet Sadik Akca, Erol Iren, Fatih Keles, Izzet Ozturk, Mahmut Altinbas
The main aim of the study was to evaluate the co-digestion performance of OFMSW with different wastes. Leachate, reverse osmosis (RO) concentrate collected from a leachate treatment facility and dewatered sewage sludge taken from a wastewater treatment plant (WWTP) were used for co-digestion in this paper. An extra effort was made to observe the effect of leachate inclusion in the co-digestion. In the study, the mono-digestion of OFMSW, leachate, RO concentrate and sewage sludge as well as digestion of 7 different waste mixtures were carried out for this objective...
May 4, 2017: Waste Management
https://www.readbyqxmd.com/read/28476307/isolation-of-organic-compounds-with-high-added-values-from-agro-industrial-solid-wastes
#12
Dimitris P Zagklis, Christakis A Paraskeva
Phenols are organic compounds with high antioxidant activity. Occurring mainly in plants, where they act as pigments or even as part of defense mechanisms against insects and herbivores. Given the positive impact on on human health, their isolation and purification from agricultural products is of particular interest for the production of nutritional, pharmaceutical and cosmetics supplements. In our study different materials rich in phenolic compounds were used, in order to separate the phenolic content and maximum condensation using physicochemical methods such as solvent extraction, filtration through membranes, adsorption/desorption on resins and vacuum distillation...
May 2, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28468513/biofouling-of-reverse-osmosis-membranes-effects-of-cleaning-on-biofilm-microbial-communities-membrane-performance-and-adherence-of-extracellular-polymeric-substances
#13
Ashraf Al Ashhab, Amer Sweity, Bihter Bayramoglu, Moshe Herzberg, Osnat Gillor
Laboratory-scale reverse osmosis (RO) flat-sheet systems were used with two parallel flow cells, one treated with cleaning agents and a control (ie undisturbed). The cleaning efforts increased the affinity of extracellular polymeric substances (EPS) to the RO membrane and altered the biofilm surface structure. Analysis of the membrane biofilm community composition revealed the dominance of Proteobacteria. However, within the phylum Proteobacteria, γ-Proteobacteria dominated the cleaned membrane biofilm, while β-Proteobacteria dominated the control biofilm...
May 4, 2017: Biofouling
https://www.readbyqxmd.com/read/28463764/cysteamine-and-graphene-oxide-mediated-copper-nanoparticle-decoration-on-reverse-osmosis-membrane-for-enhanced-anti-microbial-performance
#14
Wen Ma, Adel Soroush, Tran Van Anh Luong, Md Saifur Rahaman
In this work, copper nanoparticles (CuNPs) were decorated onto the polyamide RO membranes via in-situ reduction for biofouling mitigation. To increase CuNPs loading and improve anti-microbial properties of the membrane, cysteamine (Cys) and graphene oxide (GO), which contain different functional groups with high metal affinity, were applied as bridging agents between CuNPs and membrane surface via covalent bonding. The functionalization of Cys and GO linkers on membrane was confirmed by XPS and SEM analysis...
April 24, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28462929/membraneless-water-filtration-using-co2
#15
Sangwoo Shin, Orest Shardt, Patrick B Warren, Howard A Stone
Water purification technologies such as microfiltration/ultrafiltration and reverse osmosis utilize porous membranes to remove suspended particles and solutes. These membranes, however, cause many drawbacks such as a high pumping cost and a need for periodic replacement due to fouling. Here we show an alternative membraneless method for separating suspended particles by exposing the colloidal suspension to CO2. Dissolution of CO2 into the suspension creates solute gradients that drive phoretic motion of particles...
May 2, 2017: Nature Communications
https://www.readbyqxmd.com/read/28452496/thermodynamic-paradigm-for-solution-demixing-inspired-by-nuclear-transport-in-living-cells
#16
Ching-Hao Wang, Pankaj Mehta, Michael Elbaum
Living cells display a remarkable capacity to compartmentalize their functional biochemistry. A particularly fascinating example is the cell nucleus. Exchange of macromolecules between the nucleus and the surrounding cytoplasm does not involve traversing a lipid bilayer membrane. Instead, large protein channels known as nuclear pores cross the nuclear envelope and regulate the passage of other proteins and RNA molecules. Beyond simply gating diffusion, the system of nuclear pores and associated transport receptors is able to generate substantial concentration gradients, at the energetic expense of guanosine triphosphate hydrolysis...
April 14, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28442004/multi-response-optimization-of-process-parameters-for-imidacloprid-removal-by-reverse-osmosis-using-taguchi-design
#17
Nevim Genç, Esra Can Doğan, Ali Oğuzhan Narcı, Emine Bican
  In this study, a multi-response optimization method using Taguchi's robust design approach is proposed for imidacloprid removal by reverse osmosis. Tests were conducted with different membrane type (BW30, LFC-3, CPA-3), transmembrane pressure (TMP = 20, 25, 30 bar), volume reduction factor (VRF = 2, 3, 4), and pH (3, 7, 11). Quality and quantity of permeate are optimized with the multi-response characteristics of the total dissolved solid (TDS), conductivity, imidacloprid, and total organic carbon (TOC) rejection ratios and flux of permeate...
May 1, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/28432627/inorganic-fouling-control-in-reverse-osmosis-wastewater-reclamation-by-purging-carbon-dioxide
#18
Muhammad Kashif Shahid, Minsu Pyo, Young-Gyun Choi
Inorganic fouling on the membrane surface is one of the major prevalent issues affecting the performance and cost of reverse osmosis system. Chemical dosage is a widely adopted method for the inhibition of inorganic scale on the membrane surface. In this study, CO2 was used to control inorganic scale formation on surface of reverse osmosis (RO) membrane in wastewater reclamation. The pH of influent could be lowered by purging CO2. It caused an increase in solubility of inorganic salts in water resulting in discharge of principle ions in concentrate stream...
April 21, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28431351/role-of-membrane-fouling-substances-on-the-rejection-of-n-nitrosamines-by-reverse-osmosis
#19
Takahiro Fujioka, Hitoshi Kodamatani, Hidenobu Aizawa, Stephen Gray, Kenneth P Ishida, Long D Nghiem
The impact of fouling substances on the rejection of four N-nitrosamines by a reverse osmosis (RO) membrane was evaluated by characterizing individual organic fractions in a secondary wastewater effluent and deploying a novel high-performance liquid chromatography-photochemical reaction-chemiluminescence (HPLC-PR-CL) analytical technique. The HPLC-PR-CL analytical technique allowed for a systematic examination of the correlation between the fouling level and the permeation of N-nitrosamines in the secondary wastewater effluent and synthetic wastewaters through an RO membrane...
July 1, 2017: Water Research
https://www.readbyqxmd.com/read/28418590/control-of-biofouling-by-xanthine-oxidase-on-seawater-reverse-osmosis-membranes-from-a-desalination-plant-enzyme-production-and-screening-of-bacterial-isolates-from-the-full-scale-plant
#20
Veena Nagaraj, Lucy Skillman, Dan Li, Zhangwang Xie, Goen Ho
Control of biofouling on seawater reverse osmosis (SWRO) membranes is a major challenge as treatments can be expensive, damage the membrane material and often biocides do not remove the polymers in which bacteria are embedded. Biological control has been largely ignored for biofouling control. The objective of this study was to demonstrate the effectiveness of xanthine oxidase enzyme against complex fouling communities and then identify naturally occurring bacterial strains that produce the free radical generating enzyme...
April 18, 2017: Letters in Applied Microbiology
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