Experimental study on filtering papermaking black liquor by dynamic blade crossflow membrane

Abstract

<jats:title>Abstract</jats:title><jats:p>The fundamental reason for the environmental pollution caused by the papermaking industry is the inadequate treatment of the black liquor. How to dispose of the lignin macromolecules, which is the main pollutants in the black liquor, is the key to addressing the environmental pollution. At present, cross-flow membrane filtration is one of the effective ways to retain and recycle lignin macromolecules in black liquor. The paper proposes the adoption of a dynamic blade cross-flow membrane filtration equipment provided by German BOKELA company to treat papermaking black liquor. The experiment shows that when the black liquor is treated with dynamic blade rotation cross-flow, the membrane with a molecular weight cut-off of nanofiltration (NP010) delivers the best retaining effect, with 28 % more lignin in black liquor than that in untreated black liquor. Meanwhile, when the blade rotational speed reaches 300 rpm and the transmembrane pressure is 0.5 or 2 bar, the flux of black liquor through nanofiltration NP010 is relatively desirable.</jats:p>

Keramische Membrantechnologie für die Verfügbarmachung biogener Stoffströme

“…In diesem Zusammenhang wurde der Einsatz von keramischen tubulären Membranen beispielsweise zur Abtrennung von einigen Inhaltsstoffen aus der Schwarzlauge sowie Dünnlauge der Zellstoffproduktion untersucht [24,25,[52][53][54]. Dabei wurden keramische UF-und NF-Membranen mit verschiedenen Porengrößen als einstufiger Membranprozess bzw.…”

Study on Experiment and Simulation of Shear Force on Membrane with Dynamic Cross-Flow for Lignin in Black Liquor

“…Wenjie Zhao et al studied the treatment of paper-making black liquor by dynamic blade cross-flow membrane filtration equipment. A membrane with a molecular weight cut-off value of nanofiltration (NP010) demonstrates the best retention effect on black liquor, and the lignin content in the treated black liquor is 28% higher than that of untreated black liquor [ 22 , 23 ]. Roger Bouzerar et al reported that the high shear force caused by disk rotation can prevent the formation of filter cake at low speed except for at the central part of the membrane [ 24 ].…”

Optimal perturbations in viscous channel flow with crossflow

“…Compared to the former, which is actually difficult to be produced in many duct flows (Guha and Frigaard 2010), crossflow existing in shear flows occurs in natural scenarios and technical applications more frequently, e.g. fluid transport at the walls of blood vessels (Majdalani et al 2002) and dewatering of pulp suspensions in paper making (Zhao et al 2020). Previous works were devoted to linear stability analysis of plane Poiseuille flow with crossflow in several ways.…”