Cationic nanocelluloses in dewatering of municipal activated sludge
Suopajärvi, Terhi; Sirviö, Juho Antti; Liimatainen, Henrikki (2016-11-21)
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, https://doi.org/10.1016/j.jece.2016.11.021
© 2016 The Authors. Published by Elsevier Inc. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
https://creativecommons.org/licenses/by-nc-nd/4.0/
https://urn.fi/URN:NBN:fi-fe2019120245119
Tiivistelmä
Abstract
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.
Kokoelmat
- Avoin saatavuus [31995]