membrane chemical Articles
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Rotem sulfur pits, Israel - Case study
Project: Rotem Sulfur Pit Location: Israel Owner: Rotem Amfert Engineer: In-house General Contractor: Sealtec Construction Co. Applicator: Sealtec Construction Co. Sauereisen Representative: Israel Paycher, Sealtec Construction Co. Products: No. 89 High Temperature Membrane No. 35 Chemical Resistant Castable Method of Application: Spray Application of No. 89 Gunite No. 35 ...
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Membrane chemical cleaning: from art to science
Membrane chemical cleaning is an integral part of operation for micro- and ultrafiltration systems in the water industry and has significant impact on process operations. However, this issue has not been adequately addressed primarily for two reasons: 1) cleaning protocols are typically recommended from membrane manufacturers and some cleaners are proprietary; 2) the issues of membrane fouling ...
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Rotem S8 Sulfur Feeder Funnel - Case Study
Project: Rotem S8 Sulfur feeder funnel Location: Israel Owner: Rotem Amfert Engineer: In-house General Contractor: Sealtec Construction Co. Sauereisen Representative: Israel Paycher, Sealtec Construction Co. Products: No. 89 High Temperature Membrane No. 35 Chemical Resistant Castable Method of Application: Spray application of No. 89 Gunite application of No. 35 Environment / ...
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Membrane chemical cleaning: why is it required and how is it performed?
Membrane fouling, defined as the accumulation of particles and organic matter at the surface or in the pores of membranes occurs during membrane filtration. Membrane fouling results in membrane performance loss, i.e. lower rejection values, lower permeate flux and higher pressure drop, which translates into higher operational cost. The extent of fouling depends on the feed quality, operating ...
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Mechano-chemical ageing of PES/PVP ultrafiltration membranes used in drinking water production
In water treatment by microfiltration and ultrafiltration, a major concern is the integrity loss or failure of membrane induced by onsite operations, potentially leading to permeate water contamination. This study aims to provide a better understanding of the phenomena responsible for membrane damage by analyzing its causes and effects. The role of sodium hypochlorite exposure conditions and ...
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Recycling of end-of-life reverse osmosis membranes by oxidative treatment: a technical evaluation
The adverse impacts caused by the disposal of thousands of tonnes per annum of reverse osmosis (RO) membranes modules have grown dramatically around the world. The objective of this study was to evaluate the technical feasibility of recycling by chemical oxidation of end-of-life RO membranes for applications in other separation processes with specifications less rigorous. The recycling ...
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Two-stage anaerobic fluidized-bed membrane bioreactor treatment of settled domestic wastewater
A two-stage anaerobic fluidized-bed membrane bioreactor (SAF-MBR) system was applied for the treatment of primary-settled domestic wastewater that was further pre-treated by either 10 μm filtration or 1 mm screening. While the different pre-treatment options resulted in different influent qualities, the effluent qualities were quite similar. In both cases at a total hydraulic retention ...
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Tubular Ultrafiltration Membrane for Leachate Treatment
Technical details:High operational flux, long lifespan Tubular membrane diameter: 4, 6, 8, 10, 12 and 24 mm MWCO: 10k-250k Dalton Membrane materials: Polyvinylidene fluoride (PVDF), polysulfone (PS)Features:1. Support layer: Ultrasonic welding、High mechanical stability2. Filtration layer: PVDF coating、High COD resistance3. Product Features:High temperature resistance: 70℃High PH resistanceHigh ...
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Fast-Set Polyurea HT 100F: Concrete Waterproofing for Foundations and Walls
POLYSHIELD HT 100F is a fast-set, high performance, spray-applied, plural component, pure polyurea elastomer. This system is based on amine-terminated polyether resins, amine chain extenders, and prepolymers. It provides a cost effective flexible, tough, resilient monolithic membrane with water and chemical resistance. For more information about POLYSHIELD HT 100F, click here CONCRETE ...
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Modification of tubular ceramic membranes with carbon nanotubes using catalytic chemical vapor deposition
In this study, carbon nanotubes (CNTs) were successfully grown on tubular ceramic membranes using the catalytic chemical vapor deposition (CCVD) method. CNTs were synthesized at 650°C for 3–6 h under a 120 mL min−1 flow of C2H6 on ceramic membranes impregnated with iron salt. The synthesis procedure was beforehand optimized in terms of catalyst amount, impregnation duration and reaction ...
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Respirometric assays of two different MBR (microfiltration and ultrafiltration) to obtain kinetic and stoichiometric parameters
A comparison of two different medium scale MBRs (ultrafiltration and microfiltration) using respirometric methods has been achieved. The ultrafiltration membrane plant (0.034 µm pore size) maintained recirculation sludge flow at seven times the influent flow, and membranes were backwashed every 5 min and chemically cleaned weekly. The microfiltration membrane plant (0.4 µm pore size) maintained ...
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A clean sweep
When properly selected and applied, oil skimmers are a highly economical solution for sepaeating oil from water to allow its reuse or safe disposal. How Oil SkimmersWorkOil skimmees are simple, dependable and effective tonis for removing oil, grease and otherhydroearbono from water and can pay for themselveo within a few months. Ah oil skimmers rely on the fluid properties of specific gravity ...
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Recovery of volatile fatty acids (VFA) from complex waste effluents using membranes
Waste effluents from anaerobic digesters of agricultural waste were treated with a range of membranes, including microfiltration and nanofiltration (NF), to concentrate volatile fatty acids (VFA). Microfiltration was applied successfully to produce sterile, particle-free solutions with a VFA concentration of 21.08 mM of acetic acid and 15.81 mM of butyric acid. These were further treated using ...
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Investigation of surface and filtration properties of TiO2 coated ultrafiltration polyacrylonitrile membranes
In the present work, the surface and filtration properties of TiO2 coated polyacrylonitrile ultrafiltration membranes were investigated. The membranes were coated using the physical deposition method. The appropriate TiO2 coverage proved to be 0.3 mg/cm2, which formed a hydrophilic cake layer on the membrane surface. The cleanability without chemicals and the retention of the coated membranes ...
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A history of chemically resistant membranes
The use of polymeric membranes for filtration of non-aqueous solutions started around 1960 and has been developed significantly since then [1]. Today, non-aqueous membrane filtration applications in chemical and pharmaceutical processing account for more than 25% of the global total polymeric membrane market [2]. To put into perspective the potential significance of membrane filtration for ...
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VIDEO: HP Nanda sets out the future strategy for DuPont Water Solutions
Adding more [membrane] tools to the toolkit DuPont Water Solutions recently made the headlines with two high profile acquisitions. Kickstarting the company’s investment and growth plan was an agreement to buy the inge ultrafiltration (UF) membrane business from German chemical company, BASF, for an undisclosed sum. Following this, DuPont then signed an agreement to acquire the Memcor ...
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Physico-chemical characterisation versus
in situ micro-structural characterisation of membrane fouling in membrane bioreactorsFouling characteristics of aerobic submerged membrane bioreactors were analysed under two different membrane materials. Polyethersulfone (PES) membranes were found to foul faster at sub-critical flux than polyolefin (PO) membranes. Physico-chemical characterisation, by means of comparison of extracellular polymeric substances (EPS) and soluble microbial products (SMP) concentrations, as well as ...
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The Millennials - our next generation of membrane experts
Raul Gonzalez is a Technical Support Specialist at Avista Technologies in San Marcos, CA. After completing his Bachelor’s Degree from Cal Poly Pomona in Civil Engineering, Raul participated in the Orange County Water District internship program focused on regulatory and water production. In this role, Raul gained hands-on experience with microfiltration and ultrafiltration pilot systems ...
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Development and application of a procedure for evaluating the long-term integrity of membranes for the anaerobic fluidized membrane bioreactor (AFMBR)
A bench-scale short-term test, developed to predict the long-term integrity of membranes with potential for use in anaerobic fluidized-bed membrane bioreactors, was used to evaluate several commercial hollow-fiber membranes. It was found that membrane performance varied widely, some membranes failing much more rapidly than others. Also found was that larger sizes of the fluidized media, in ...
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Impact of
Microcystis aeruginosa on membrane fouling in a biologically treated effluentMicrocystis aeruginosa was cultured in biologically treated municipal effluent to simulate blue-green algal bloom conditions in a treatment lagoon. The effect of algae in the early, mid and late phases of growth on membrane fouling, chemical coagulation (alum or aluminium chlorohydrate (ACH)) and hydraulic cleaning on the microfiltration of this effluent was investigated. The effect of M. ...
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