Investigation of the cohesive strength of membrane fouling layers formed during cross-flow microfiltration: The effects of pH adjustment on the properties and fouling characteristics of microcrystalline cellulose
Artikel i vetenskaplig tidskrift, 2019

Fluid dynamic gauging was used to investigate the cohesive strength of the membrane fouling layer formed during cross-flow microfiltration of microcrystalline cellulose. Fouling behaviour was compared at two pH levels (i.e. different surface charges of the particles and membranes) with two membranes (i.e. regenerated cellulose and polyethersulphone). It was found that a suspension at low pH, where the surface charge of the particles is close to zero, resulted in thicker and stronger surface fouling layers (668 ± 66 μm thick at a shear stress of 36 Pa for the regenerated cellulose membrane). The permeate flux was reduced by 62% during the first 1000 s. For close-to-neutral pH, where the particles are negatively charged, the fouling layers were thinner and less resistant to shear stress (290 ± 77 μm thick at a shear stress of 36 Pa) and the decline of the flux was faster: a 90% decrease was recorded during the initial 1000 s. The differences in flux decline behaviour suggest a more pronounced blocking of the pore openings for the membranes at the higher pH. Similar fouling behaviour was observed for the two membranes. An atomic force microscope equipped with a colloid probe was used to evaluate particle/particle and particle/membrane interactions.

Colloid probe

Cross-flow micro filtration

Microcrystalline cellulose

Electrostatic interactions

Fluid dynamic gauging

Författare

Mi Zhou

Wallenberg Wood Science Center (WWSC)

Chalmers, Kemi och kemiteknik, Kemiteknik, Kemisk reaktionsteknik

Hilda Sandström

Chalmers, Kemi och kemiteknik, Kemi och biokemi, Fysikalisk kemi

Maria Paraskevi Belioka

Kungliga Tekniska Högskolan (KTH)

Torbjörn Pettersson

Kungliga Tekniska Högskolan (KTH)

Tuve Mattsson

Wallenberg Wood Science Center (WWSC)

Chalmers, Kemi och kemiteknik, Kemiteknik, Kemisk reaktionsteknik

Chemical Engineering Research and Design

0263-8762 (ISSN) 1744-3563 (eISSN)

Vol. 149 52-64

Ämneskategorier

Pappers-, massa- och fiberteknik

Livsmedelsteknik

Annan materialteknik

DOI

10.1016/j.cherd.2019.06.037

Mer information

Senast uppdaterat

2019-12-02