University of Oulu

Terhi Suopajärvi, Juho Antti Sirviö, Henrikki Liimatainen, Cationic nanocelluloses in dewatering of municipal activated sludge, Journal of Environmental Chemical Engineering, Volume 5, Issue 1, 2017, Pages 86-92, ISSN 2213-3437,

Cationic nanocelluloses in dewatering of municipal activated sludge

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Author: Suopajärvi, Terhi1; Sirviö, Juho Antti1; Liimatainen, Henrikki1
Organizations: 1Fiber and Particle Engineering Unit, P.O. Box 4300, FI-90014 University of Oulu, Finland
Format: article
Version: accepted version
Access: open
Online Access: PDF Full Text (PDF, 1.5 MB)
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Language: English
Published: Elsevier, 2017
Publish Date: 2019-12-02


This study used cationic nanocelluloses (CNFC I and II) produced by nanofibrillizing periodate oxidized and aminoguanidine hydrochloride reacted wood cellulose as flocculation agents for municipal activated sludge. For both CNFC I and II, the diameters ranged from about 2–8 nm. Lengths ranged from hundreds of nanometers for CNFC I and about 50–100 nm for CNFC II. The charge densities for CNFC I and II were 1.07 and 1.70 meq g−1, respectively. The study examined the flocculation performance of the two CNFCs in the conditioning treatment of municipal activated sludge and compared the results with the performance of both a commercial coagulant and polyelectrolyte (polyacrylamide). Results showed that both CNFC I and II were able to flocculate activated sludge efficiently at effective doses similar to those of the commercial cationic polymer and at doses lower than the reference coagulant. Their efficiency in reducing turbidity was nearly as good as that of the synthetic reference polymer, and their COD was even better than that of the synthetic reference polymer. The performance of CNFC II was slightly better than that of CNFC I. In centrifugation analyses, the use of both CNFCs resulted in dense sludge cakes with moderate swelling and good colloidal-removal efficiency.

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Series: Journal of environmental chemical engineering
ISSN: 2213-2929
ISSN-E: 2213-3437
ISSN-L: 2213-2929
Volume: 5
Issue: 1
Pages: 86 - 92
DOI: 10.1016/j.jece.2016.11.021
Type of Publication: A1 Journal article – refereed
Field of Science: 216 Materials engineering
218 Environmental engineering
Funding: Juha Sahi and Emilia Kaitala are recognized for their contributions to the experiments. The authors would also like to acknowledge the Measurement, Monitoring, and Environmental Efficiency Assessment (MMEA) research program of the CLEEN Ltd. Cluster for Energy and Environment.
Copyright information: © 2016 The Authors. Published by Elsevier Inc. This manuscript version is made available under the CC-BY-NC-ND 4.0 license