Ultrafiltration Articles on Environmental XPRT

MIEX® Pretreatment to Micro & UltraFiltration

There are currently (in 2006) four full-scale membrane plants in operation where the MIEX® Process pre-treats water prior to the membrane process. Two plants use Microfiltration (MF) and two use Ultrafiltration (UF). This technical note highlights the benefits of MIEX® Treatment prior to MF and UF based on operating data and experience at these facilities. In particular, data is provided from the ...

Dec. 1, 2006

By IXOM Watercare

PREFILTERS IN ULTRAFILTRATION PROCESSES

AZUD HELIX AUTOMATIC filters are excellent protecting Ultrafiltration membranes. Their operation is based in the disc filtration technology, which supplies an in-depth filtration. The installation of AZUD HELIX AUTOMATIC filtration equipments as prefilters is one of its commonest applications. The installation of AZUD HELIX AUTOMATIC filtration equipment prior to the cartridge filters permits: ...

Mar. 7, 2013

By Sistema Azud, S.A.

The impact of anionic polyacrylamide (APAM) on ultrafiltration efficiency in flocculation-ultrafiltration process

With the purpose of improving the ultrafiltration (UF) efficiency, anionic polyacrylamide (APAM) has been used as a coagulant aid in the flocculation-UF process. In this study, the impact of APAM on UF efficiency has been investigated with regard to membrane fouling, membrane cleaning and effluent quality. The results indicated that the optimal dosage of APAM had positive impacts on membrane ...

Feb. 16, 2017

By IWA Publishing

What Are the Best Companies for Microfiltration and Ultrafiltration Membrane Systems?

Whether you are looking for a microfiltration or ultrafiltration (MF/UF) membrane system that will help your facility manufacture safe food and/or beverages, boiler feed water for industrial process, or treat contaminated waste to acceptable effluent standards, it can be overwhelming to search for the MF/UF membrane system that is ideal for your specific application. MF/UF membrane systems solve ...

Feb. 24, 2017

By SAMCO Technologies, Inc.

Factors affecting coagulation as a pretreatment to ultrafiltration membranes

Low pressure membranes can be effective in treating various types of water, but are subject to fouling. In this work, chemical coagulation was studied as a pretreatment to ultrafiltration (UF), with the goal of mitigating fouling while maintaining high permeate water quality. Alum and ferric chloride were evaluated, as well as two polyaluminum chloride (PACl) products of different basicities ...

Sep. 25, 2012

By IWA Publishing

Cottonwood power – ultrafiltration pretreatment of a problem water

The Facility The Cottonwood Power Project is one of the first United States power plant projects for InterGen, a joint venture between Houstonbased firms Shell Oil Co. and Bechtel Corp. Located in Deweyville, Texas along the Texas-Louisiana border, the plant is a natural gas fired, four-unit combined cycle facility capable of producing 1,230 megawatts of power. The ...

Sep. 14, 2010

By Aquatech International Corporation

Effect of enhanced coagulation by KMnO4 on the fouling of ultrafiltration membranes

Pre-coagulation enhanced by KMnO4 before ultrafiltration (KCUF) was compared with normal pre-coagulation by alum (CUF) in the ultrafiltration of water from the Songhua River, China. The trans-membrane pressure (TMP) with KCUF was much lower than that when alum alone was used. With KCUF a slower increment of TMP occurred, even under conditions of high river water turbidity. The results also showed ...

Jan. 1, 2011

By IWA Publishing

Ideal treatment of laundry wastewater with ultrafiltration installations

Treatment of very dirty work clothing also produces heavily polluted, oily/greasy wastewater. It is the aim of laundry wastewater treatment to reduce fresh water consumption and to minimise the volume of residuals. At the same time, adherence to the limit values according to appendix 55 of the General provisions on hydrocarbon, heavy metal and AOX contamination in wastewater must be guaranteed. ...

Jan. 16, 2015

By EnviroChemie GmbH

Feasibility assessment of surface water disinfection by ultrafiltration

Ultrafiltration (UF) has been presented as an alternative to chemical disinfection to obtain safe drinking water, for its ability to remove microbiological contamination. Hollow-fiber UF membranes are designed as an effective barrier to microorganisms, for their high manufacturing integrity and for the ‘potting’ method adopted to seal fibers to the feeding/extraction manifold. ...

Aug. 6, 2014

By IWA Publishing

Characterization of ultrafiltration of undiluted and diluted stored urine

Urine ultrafiltration (UF) was studied in terms of flux, permeability, resistance and fouling. Two types of samples were used: stored urine representing the feedstock obtained from urine diversion dry toilets; and diluted stored urine representing the feedstock obtained from urinals. Three different filtration experiment sets were adopted in this study. For the first case, pressure was set in ...

Aug. 13, 2016

By IWA Publishing

Influence of Operating Parameters on Ultrafiltration Membrane Dextran Rejection

Abstract The Membrane Technologist today has a wide variety of ultrafiltration (UF) available as a repertoire for applications development. The concept of molecular weight cut-off (MWCO) can be arbitrary. The consequences of non-standard characterization protocols, differences in membrane morphology, generic polymer composition and the chemical nature of the MWCO test solute all ...

Jan. 1, 1990

Ageing and Characterization of PES Ultrafiltration Membranes Exposed to Hypochlorite

Polyethersulfone (PES) ultrafiltration (UF) hollow fibers are widely used for drinking water production. During onsite operation, backwashing (brief, high occurrence, low concentration in free chlorine: 10 ppm to 20 ppm) and chemical washing (longer, less frequent, high concentration in free chlorine: 200 ppm to 400 ppm) are applied to PES fibers to ensure their proper functioning. Impact of ...

Apr. 16, 2012

By IWA Publishing

Development of antifouling ultrafiltration membranes by surface modification

Poly(vinylidene fluoride) (PVDF) membranes were prepared by phase inversion technique. The effects of polystyrene (PS) concentrations on the blend membrane performance were investigated. The membranes were characterised in terms of shrinkage ratio, pure water flux, and porosity. The hydrophobicity of the membrane was modified by poly(vinyl alcohol) (PVA) through adsorption and crosslinking. The ...

Jul. 1, 2010

By Inderscience Publishers

Effect of functionalisation on polysulfone-based ultrafiltration membranes

Polysulfone membranes possess excellent mechanical, biological and chemical stability but they suffer from fouling which leads to flux decline. Fouling can be minimised by functionalisation. In an attempt to overcome this limitation, the polysulfone was both sulphonated and carboxylated. The presence of sulphonic and carboxylic groups was confirmed through IR and NMR studies. Incorporation of ...

Jul. 1, 2010

By Inderscience Publishers

Membrane fouling remediation in ultrafiltration of latex contaminated wastewater

The current study aimed to remediate membrane fouling by latex effluent by altering membrane surface charge or ionic strength of the effluent. Hydrophilic polysulfone and Ultrafilic flat membranes, with molecular weight cutoff (MWCO) of 60,000 and 100,000, respectively, and hydrophobic polyvinylidene difluoride membrane (PVDF; MWCO 100,000) were used under a constant flow rate and in ...

Oct. 15, 2015

By IWA Publishing

Microfiltration vs Ultrafiltration Processes: What is the Difference?

Microfiltration (MF) and ultrafiltration (UF) are both processes by which a contaminated liquid is passed through a semipermeable membrane that removes solids too large to fit through the membrane’s pore size, yielding a purified liquid stream. To what degree the stream is purified depends on the contaminants present and the pore size of the membrane. MF and UF are generally ...

Mar. 9, 2017

By SAMCO Technologies, Inc.

Hyde ultrafiltration for tumbling/vibratory deburring applications

Challenge Fabrication manufacturer has an issue with discharging tumbling water from two vibratory deburring systems. Customer Hartzell Manufacturing Industry Medical, Electronic and Bank Security Product Hyde Ultrafiltration System Business Benefits Realized ...

Dec. 8, 2011

By PRAB, Inc

Ultrafiltration and Reverse Osmosis for Landfill Leachate Treatment

Lanchester Landfill serves Eastern Lancaster County and Western Chester County in PA for disposal of household and construction waste. The facility produces around 10,000 gals per day of leachate. The Problem The facility ran a single basin sequential batch reactor (SBR) and a filter press to dewater the solids for many years, but found that they first, could not sustain a ...

Oct. 7, 2011

By Dynatec Systems Inc.

Predictability of fouling-potential of raw water for ultrafiltration membranes

The public drinking water supply of southern Germany is characterized by a rather decentralized network. Due to the hydrogeological setting in these parts of Germany many of the small water works with an average capacity of 50 m3/h have to treat raw water extracted from karstic or cliffy aquifers. These raw waters tend to be contaminated with particles and pathogens acquired during snowmelt or ...

Jan. 1, 2011

By IWA Publishing

Removal of lead from aqueous solutions by complexation ultrafiltration with chitosan

The removal of lead from aqueous dilute solutions by complexation-ultrafiltration with chitosan was studied. Experiments were performed as a function of aqueous pH, chitosan/Pb2+ ratio, and background electrolyte concentration. The value of pH was found to be the most important parameter to effect the lead removal. The lead removal rate reaches the plateau at almost 100% when the chitosan and ...

Mar. 1, 2011

By IWA Publishing

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