Analysis of dissolved and colloidal substances in old corrugated containers’ whitewater and dissolved substances’ impact on colloidal substances’ stability

The physicochemical properties of dissolved and colloidal substances (DCS) in the old corrugated containers’ (OCC) whitewater were studied. Then, the colloidal substances (CS) were separated from dissolved substances (DS) and the effect of inorganic salts on the stability of CS (not DCS) was studied...

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Bibliographic Details
Published in:Bioresources 2020-08, Vol.15 (3), p.6668-6679
Main Authors: Liu, Hui, Li, Meiling, Zhu, Kaili, Ma, Haitong, Wu, Yueru, Wang, Zhiwei, Wang, Shuangfei
Format: Article
Language:English
Subjects:
Calcium
Calcium ions
Chemical oxygen demand
Colloids
Containers
Electrolytes
Fillers
Fixatives
Hemodialysis
Inorganic salts
Particle size
Physicochemical properties
Precipitates
Pulping
Recycling
Salts
Scientific imaging
Sedimentation & deposition
Stability
White water
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Summary:The physicochemical properties of dissolved and colloidal substances (DCS) in the old corrugated containers’ (OCC) whitewater were studied. Then, the colloidal substances (CS) were separated from dissolved substances (DS) and the effect of inorganic salts on the stability of CS (not DCS) was studied for the first time. The results showed that many DCS aggregated and attached to the fiber surface when pulping. The primary sources were resin, lignin, adhesives, coating fixatives, and fillers. The colloidal stability of DCS and solids of whitewater differed because the DCS contained less filler. Both Ca2+ and Na+ can affect the stability of CS, but Ca2+ led to more CS instability and aggregated into larger flocculent precipitates. The surprising discovery in the experiment was that when Ca2+ and Na+ were added together, the instability degree of the system was between the addition of Ca2+ and Na+ alone. Ca2+ played a dominant role in affecting the stability of CS, and Na+ competed for adsorption sites.
ISSN:1930-2126
1930-2126
DOI:10.15376/biores.15.3.6668-6679