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Dewatering fibrous sludge with soy protein

Paper ID Volume ID Publish Year Pages File Format Full-Text
34832 45051 2014 4 PDF Available
Title
Dewatering fibrous sludge with soy protein
Abstract

•Soy protein is shown to function as a sludge conditioner.•It can largely replace petroleum-based polymers.•High cake solids are obtained upon belt pressing.•It is approximately five times cheaper that traditional polymers.•This is the first “green” sludge conditioner described.

Sludge is typically conditioned with petroleum-based polymers such as cationic polyacrylamides (c-PAMs) prior to dewatering. It is shown that soy and whey proteins can function as sludge conditioners. High cake solids are obtained when fiber or fibrous sludge is dewatered after treatment with a crude soy flour hydrolysate. Filtrate turbidity is not reduced by the soy alone, but it can be significantly lowered with a small c-PAM supplement. The approach is demonstrated with wood pulp fiber and several paper mill sludges. The binding of soy protein to sludge solids is much weaker than that of c-PAM, but it still produces a denser cake because charge reversal is reduced. Although soy protein and sludge particles are both negatively charged overall they both contain positively charged groups that facilitate bonding. The cost:benefits of c-PAM supplemented soy protein are attractive when compared to a full c-PAM dose. In addition, the soy product has a green value.

Keywords
Soy; Sludge; Protein; Dewatering; Cationic polyacrylamide; Flocculant
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Publisher
Database: Elsevier - ScienceDirect
Journal: Process Biochemistry - Volume 49, Issue 1, January 2014, Pages 120–123
Authors
,
Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
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Any Questions? feel free to contact us