Influence of pH and fouling characterization during membrane process for lignin recovery from the process water of thermomechanical pulping

2021 ◽  
pp. 119162
Author(s):  
M. Courbalay ◽  
M. Villain-Gambier ◽  
A. Klem ◽  
I. Ziegler-Devin ◽  
S. Dumarcay ◽  
...  
Keyword(s):  
Process Water ◽  
Membrane Process ◽  
Thermomechanical Pulping ◽  
Lignin Recovery ◽  
Influence Of Ph

Selective purification of bleached spruce TMP process water by induced air flotation (IAF)

Holzforschung ◽  
2014 ◽  
Vol 68 (2) ◽  
pp. 157-165 ◽  
Author(s):  
Dariusz Zasadowski ◽  
Anders Strand ◽  
Anna Sundberg ◽  
Håkan Edlund ◽  
Magnus Norgren
Keyword(s):  
Ph Value ◽  
Additional Treatment ◽  
Process Water ◽  
Ionization Mass ◽  
Paper Mills ◽  
Foaming Agent ◽  
Peroxide Bleaching ◽  
Alkaline Peroxide ◽  
Thermomechanical Pulping ◽  
Air Flotation

Abstract The environmentally benign closure of water systems in paper mills leads to the problem of accumulation of dissolved and colloidal wood substances (DCS) in process water. Notably, pitch affects the pulp and paper production negatively and increases the demand for additional treatment of the process water. In the present article, the purification of thermomechanical pulping process water from the alkaline peroxide bleaching stage has been investigated, with the induced air flotation (IAF) in focus. The following parameters were considered concerning the IAF efficiency to remove detrimental substances: concentration of cationic foaming agent, pH value, calcium concentration, and temperature. The amounts and characteristics of residual DCS were determined by gas chromatography and turbidity measurements. Residual concentrations of the foaming agent dodecyltrimetylammonium chloride were determined by electrospray ionization mass spectrometry. Up to 90% of pitch was removed, whereas hemicelluloses, which are important in preventing pitch problems, remained in the waters. Up to 70% of the pectic acids accounted for the high cationic demand of the process waters were removed by optimization of the IAF parameters. The presented separation process gives new opportunities to a selective purification of the process waters.

Treatment of poultry slaughterhouse wastewater using a membrane process, water reuse, and economic analysis

2015 ◽  
Vol 57 (11) ◽  
pp. 4944-4951 ◽  
Author(s):  
Tamer Coskun ◽  
Eyup Debik ◽  
Harun Akif Kabuk ◽  
Neslihan Manav Demir ◽  
Irfan Basturk ◽  
...  
Keyword(s):  
Economic Analysis ◽  
Water Reuse ◽  
Process Water ◽  
Membrane Process ◽  
Slaughterhouse Wastewater

Enzyme-based approaches for pitch control in thermomechanical pulping of softwood and pitch removal in process water

2008 ◽  
Vol 83 (9) ◽  
pp. 1261-1266 ◽  
Author(s):  
Etienne Dubé ◽  
François Shareck ◽  
Yves Hurtubise ◽  
Marc Beauregard ◽  
Claude Daneault
Keyword(s):  
Process Water ◽  
Pitch Control ◽  
Thermomechanical Pulping

scholarly journals Investigations of Alkaline and Enzymatic Membrane Cleaning of Ultrafiltration Membranes Fouled by Thermomechanical Pulping Process Water

Membranes ◽  
2018 ◽  
Vol 8 (4) ◽  
pp. 91 ◽  
Author(s):  
Gregor Rudolph ◽  
Herje Schagerlöf ◽  
Kristian Morkeberg Krogh ◽  
Ann-Sofi Jönsson ◽  
Frank Lipnizki
Keyword(s):  
Membrane Fouling ◽  
Membrane Surface ◽  
Paper Industry ◽  
Initial Permeability ◽  
Process Water ◽  
Cleaning Efficiency ◽  
Industrial Sectors ◽  
Cleaning Agents ◽  
Thermomechanical Pulping ◽  
Membrane Lifetime

The pulp and paper industry is one of the most important industrial sectors worldwide, and has considerable potential for the sustainable fractionation of lignocellulosic biomass to provide valuable compounds. Ultrafiltration (UF) is a suitable separation technique for the profitable production of hemicelluloses from process water from thermomechanical pulping (ThMP), but is limited by membrane fouling. Improvements in cleaning protocols and new alternative cleaning agents are required to ensure a long membrane lifetime, and thus a sustainable process. This study, therefore, focuses on the cleaning of polymeric UF membranes after the filtration of ThMP process water, comparing alkaline with enzymatic cleaning agents. The aim was to develop a cleaning procedure that is efficient under mild conditions, resulting in a lower environmental impact. It was not possible to restore the initial permeability of the membrane when cleaning the membrane with enzymes alone, but the permeability was restored when using a two-step cleaning process with enzymes in the first step and an alkaline cleaning agent in the second step. Scanning electron microscopy gave a deeper inside into the cleaning efficiency. Attenuated total reflectance Fourier-transform infrared spectroscopy analysis confirmed that not only polysaccharides, but also extractives are adsorbed onto the membrane surface.

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