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Effects of Cationic Polyacrylamide Characteristics on Sewage Sludge Dewatering and Moisture Evaporation

The effects of the molecular weight (MW) and charge density (CD) of cationic polyacrylamide (CPAM) on sludge dewatering and moisture evaporation were investigated in this study. Results indicated that in sludge conditioning, the optimum dosages were 10, 6, 6, 4, and 4 mg g(−1) CPAM with 5 million MW...

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Autores principales: Zhou, Jun, Liu, Fenwu, Pan, Chengyi
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Public Library of Science 2014
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4039440/
https://www.ncbi.nlm.nih.gov/pubmed/24878582
http://dx.doi.org/10.1371/journal.pone.0098159
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author Zhou, Jun
Liu, Fenwu
Pan, Chengyi
author_facet Zhou, Jun
Liu, Fenwu
Pan, Chengyi
author_sort Zhou, Jun
collection PubMed
description The effects of the molecular weight (MW) and charge density (CD) of cationic polyacrylamide (CPAM) on sludge dewatering and moisture evaporation were investigated in this study. Results indicated that in sludge conditioning, the optimum dosages were 10, 6, 6, 4, and 4 mg g(−1) CPAM with 5 million MW and 20% CD, 5 million MW and 40% CD, 3 million MW and 40% CD, 8 million MW and 40% CD, and 5 million MW and 60% CD, respectively. The optimum dosage of CPAM was negatively correlated with its CD or MW if the CD or MW of CPAM was above 20% or 5 million. In the centrifugal dewatering of sludge, the moisture content in the conditioned sludge gradually decreased with the extension of centrifugation time, and the economical centrifugal force was 400×g. The moisture evaporation rates of the conditioned sludge were closely related to sludge dewaterability, which was in turn significantly correlated either positively with the solid content of sludge particles that were >2 mm in size or negatively with that of particles measuring 1 mm to 2 mm in diameter. During treatment, sludge moisture content was reduced from 80% to 20% by evaporation, and the moisture evaporation rates were 1.35, 1.49, 1.62, and 2.24 times faster in the sludge conditioned using 4 mg g(−1) CPAM with 5 million MW and 60% CD than in the sludge conditioned using 4 mg g(−1) CPAM with 8 million MW and 40% CD, 6 mg g(−1) CPAM with 5 million MW and 40% CD, 6 mg g(−1) CPAM with 3 million MW and 40% CD, and 10 mg g(−1) CPAM with 5 million MW and 20% CD, respectively. Hence, the CPAM with 5 million MW and 60% CD was ideal for sludge dewatering.
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spelling pubmed-40394402014-06-02 Effects of Cationic Polyacrylamide Characteristics on Sewage Sludge Dewatering and Moisture Evaporation Zhou, Jun Liu, Fenwu Pan, Chengyi PLoS One Research Article The effects of the molecular weight (MW) and charge density (CD) of cationic polyacrylamide (CPAM) on sludge dewatering and moisture evaporation were investigated in this study. Results indicated that in sludge conditioning, the optimum dosages were 10, 6, 6, 4, and 4 mg g(−1) CPAM with 5 million MW and 20% CD, 5 million MW and 40% CD, 3 million MW and 40% CD, 8 million MW and 40% CD, and 5 million MW and 60% CD, respectively. The optimum dosage of CPAM was negatively correlated with its CD or MW if the CD or MW of CPAM was above 20% or 5 million. In the centrifugal dewatering of sludge, the moisture content in the conditioned sludge gradually decreased with the extension of centrifugation time, and the economical centrifugal force was 400×g. The moisture evaporation rates of the conditioned sludge were closely related to sludge dewaterability, which was in turn significantly correlated either positively with the solid content of sludge particles that were >2 mm in size or negatively with that of particles measuring 1 mm to 2 mm in diameter. During treatment, sludge moisture content was reduced from 80% to 20% by evaporation, and the moisture evaporation rates were 1.35, 1.49, 1.62, and 2.24 times faster in the sludge conditioned using 4 mg g(−1) CPAM with 5 million MW and 60% CD than in the sludge conditioned using 4 mg g(−1) CPAM with 8 million MW and 40% CD, 6 mg g(−1) CPAM with 5 million MW and 40% CD, 6 mg g(−1) CPAM with 3 million MW and 40% CD, and 10 mg g(−1) CPAM with 5 million MW and 20% CD, respectively. Hence, the CPAM with 5 million MW and 60% CD was ideal for sludge dewatering. Public Library of Science 2014-05-30 /pmc/articles/PMC4039440/ /pubmed/24878582 http://dx.doi.org/10.1371/journal.pone.0098159 Text en © 2014 Zhou et al http://creativecommons.org/licenses/by/4.0/ This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.
spellingShingle Research Article
Zhou, Jun
Liu, Fenwu
Pan, Chengyi
Effects of Cationic Polyacrylamide Characteristics on Sewage Sludge Dewatering and Moisture Evaporation
title Effects of Cationic Polyacrylamide Characteristics on Sewage Sludge Dewatering and Moisture Evaporation
title_full Effects of Cationic Polyacrylamide Characteristics on Sewage Sludge Dewatering and Moisture Evaporation
title_fullStr Effects of Cationic Polyacrylamide Characteristics on Sewage Sludge Dewatering and Moisture Evaporation
title_full_unstemmed Effects of Cationic Polyacrylamide Characteristics on Sewage Sludge Dewatering and Moisture Evaporation
title_short Effects of Cationic Polyacrylamide Characteristics on Sewage Sludge Dewatering and Moisture Evaporation
title_sort effects of cationic polyacrylamide characteristics on sewage sludge dewatering and moisture evaporation
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4039440/
https://www.ncbi.nlm.nih.gov/pubmed/24878582
http://dx.doi.org/10.1371/journal.pone.0098159
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