Research Papers by Maria Norberta de Pinho

1 - 7 of 7 results

Dissolved air flotation of surface water for spiral-wound module nanofiltration pre-treatment Bench-scale dissolved air flotation (DAF) of Tagus River surface water (Valadas, Portugal) was investigated as pre-treatment for spiral-wound module nanofiltration (SWNF). Before the DAF, a coagulation/flocculation of the surface water was performed using aluminium sulphate, ferric chloride and chit Desalination 228 (2008)
Comparison of the performance of ultrafiltration and nanofiltration in surface water treatment UF carried out at pressures up to 4 bar and NF operated in all the range of pressures present a good performance in terms of permeation fluxes. The UF and NF permeation fluxes decrease slightly with WRR and they are 15– 19% lower than pure water fluxes indicating a low degree of membrane fouling for Desalination 199 (2006)
Cork processing wastewaters treatment by an ozonization/ ultrafiltration integrated process Membrane fouling has been identified as one of the major problems during the treatment by ultrafiltration (UF) of the cork processing wastewaters. This problem leads to the drastic reduction of the UF permeate fluxes and is often attributed to the fact that these wastewaters are rich in phenolic/tan Desalination 191 (2006)
Mass transfer coefficient determination method for high-recovery pressure-driven membrane modules A mass transfer coefficient determination method, based on the velocity variation method, is developed for pressure-driven membrane modules with large membrane area and high recovery rates. The method was used to measure mass transfer coefficients in the nanofiltration spiral-wound module Filmtec NF Desalination 195 (2006)
Enzymatic hydrolysis of beechwood xylan in a membrane reactor This work addresses the enzymatic hydrolysis of beechwood xylan on a membrane reactor with tangential flow over an ultrafiltration membrane. The hydrolysis was carried out on concentration mode, with circulating substrate, and results were compared with those obtained for batch assays. The oligosacc Desalination 149 (2002)
The effect of the ladder-type spacers configuration in NF spiralwound modules on the concentration boundary layers disruption The laminar flow structure and concentration distribution in a narrow rectangular channel simulating the feed channel of nanofiltration (NF) spiral-wound modules are investigated. The continuity, Navier–Stokes equations and the solute continuity equation are solved by the control volume formulation. Desalination 146 (2002)
The role of membrane morphology on ultrafiltration for natural organic matter removal Natural Organic Matter (NOM) is abundant in natural waters and is one of the major fouling agents during membrane filtration of surface water. This work addresses the evaluation of the influence of the membrane pore size on the permeation characteristics of humic acid solutions. Five cellulose aceta Desalination 145 (2002)

Dissolved air flotation of surface water for spiral-wound module nanofiltration pre-treatment

Bench-scale dissolved air flotation (DAF) of Tagus River surface water (Valadas, Portugal) was investigated as pre-treatment for spiral-wound module nanofiltration (SWNF). Before the DAF, a coagulation/flocculation of the surface water was performed using aluminium sulphate, ferric chloride and chit

Desalination 228 (2008)

Comparison of the performance of ultrafiltration and nanofiltration in surface water treatment

UF carried out at pressures up to 4 bar and NF operated in all the range of pressures present a good performance in terms of permeation fluxes. The UF and NF permeation fluxes decrease slightly with WRR and they are 15– 19% lower than pure water fluxes indicating a low degree of membrane fouling for

Desalination 199 (2006)

Cork processing wastewaters treatment by an ozonization/ ultrafiltration integrated process

Membrane fouling has been identified as one of the major problems during the treatment by ultrafiltration (UF) of the cork processing wastewaters. This problem leads to the drastic reduction of the UF permeate fluxes and is often attributed to the fact that these wastewaters are rich in phenolic/tan

Desalination 191 (2006)

Mass transfer coefficient determination method for high-recovery pressure-driven membrane modules

A mass transfer coefficient determination method, based on the velocity variation method, is developed for pressure-driven membrane modules with large membrane area and high recovery rates. The method was used to measure mass transfer coefficients in the nanofiltration spiral-wound module Filmtec NF

Desalination 195 (2006)

Enzymatic hydrolysis of beechwood xylan in a membrane reactor

This work addresses the enzymatic hydrolysis of beechwood xylan on a membrane reactor with tangential flow over an ultrafiltration membrane. The hydrolysis was carried out on concentration mode, with circulating substrate, and results were compared with those obtained for batch assays. The oligosacc

Desalination 149 (2002)

The effect of the ladder-type spacers configuration in NF spiralwound modules on the concentration boundary layers disruption

The laminar flow structure and concentration distribution in a narrow rectangular channel simulating the feed channel of nanofiltration (NF) spiral-wound modules are investigated. The continuity, Navier–Stokes equations and the solute continuity equation are solved by the control volume formulation.

Desalination 146 (2002)

The role of membrane morphology on ultrafiltration for natural organic matter removal

Natural Organic Matter (NOM) is abundant in natural waters and is one of the major fouling agents during membrane filtration of surface water. This work addresses the evaluation of the influence of the membrane pore size on the permeation characteristics of humic acid solutions. Five cellulose aceta

Desalination 145 (2002)

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