Evaluation of hydrophobically associating cationic starch-based flocculants in sludge dewatering

Abstract Two series of binary graft cationic starch-based flocculants (CS-DMCs and CS-DMLs) with different hydrophilicity and charge density (CD) were prepared by graft copolymerization of acrylamide with 2-(Methacryloyloxy)-N,N,N-trimethylethanaminium chloride and methacrylic acid 2-(benzyldimethyl...

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Autores principales:	Pan Hu, Shaohang Shen, Hu Yang
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/416d9856d837421e91da6efebde181b8
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spelling	oai:doaj.org-article:416d9856d837421e91da6efebde181b82021-12-02T17:51:06ZEvaluation of hydrophobically associating cationic starch-based flocculants in sludge dewatering10.1038/s41598-021-91323-y2045-2322https://doaj.org/article/416d9856d837421e91da6efebde181b82021-06-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-91323-yhttps://doaj.org/toc/2045-2322Abstract Two series of binary graft cationic starch-based flocculants (CS-DMCs and CS-DMLs) with different hydrophilicity and charge density (CD) were prepared by graft copolymerization of acrylamide with 2-(Methacryloyloxy)-N,N,N-trimethylethanaminium chloride and methacrylic acid 2-(benzyldimethylaminio) ethyl chloride, respectively, on the starch (St) backbone. The sludge dewatering performance of CS-DMCs and CS-DMLs were evaluated and compared based on the changes in filter cake moisture content (FCMC), specific resistance of filtration (SRF), fractions and components of extracellular polymeric substances, and various physiochemical characteristics of sludge flocs and cakes. Increase in CD of the St-based flocculants caused improved sludge dewaterability. Under the similar CD, CS-DML with relatively high hydrophobicity exhibited lower FCMC and SRF, larger and denser sludge flocs, and better permeability of sludge cakes than CS-DMCs due to the synergistic effects of charge neutralization, bridging flocculation and hydrophobic association. Furthermore, a second-order polynomial model on the basis of phenomenological theory was successfully applied to quantitatively evaluate the influences of the two important structural factors of these St-based flocculants, i.e., hydrophobicity and CD, on the sludge dewaterability. The structure–activity relationship of the St-based flocculants in sludge dewatering was obtained according to the theoretic simulation. The dewatering mechanisms was discussed in depth on the basis of the experimental and simulated results; besides, the FCMC and optimal dose can be predicted by the established structure–activity relationship. This current work offered a novel and valuable way to exploit and design of low-cost and high-performance graft natural polymeric flocculants applied in efficient conditioning of sludge.Pan HuShaohang ShenHu YangNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-13 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Pan Hu Shaohang Shen Hu Yang Evaluation of hydrophobically associating cationic starch-based flocculants in sludge dewatering
description	Abstract Two series of binary graft cationic starch-based flocculants (CS-DMCs and CS-DMLs) with different hydrophilicity and charge density (CD) were prepared by graft copolymerization of acrylamide with 2-(Methacryloyloxy)-N,N,N-trimethylethanaminium chloride and methacrylic acid 2-(benzyldimethylaminio) ethyl chloride, respectively, on the starch (St) backbone. The sludge dewatering performance of CS-DMCs and CS-DMLs were evaluated and compared based on the changes in filter cake moisture content (FCMC), specific resistance of filtration (SRF), fractions and components of extracellular polymeric substances, and various physiochemical characteristics of sludge flocs and cakes. Increase in CD of the St-based flocculants caused improved sludge dewaterability. Under the similar CD, CS-DML with relatively high hydrophobicity exhibited lower FCMC and SRF, larger and denser sludge flocs, and better permeability of sludge cakes than CS-DMCs due to the synergistic effects of charge neutralization, bridging flocculation and hydrophobic association. Furthermore, a second-order polynomial model on the basis of phenomenological theory was successfully applied to quantitatively evaluate the influences of the two important structural factors of these St-based flocculants, i.e., hydrophobicity and CD, on the sludge dewaterability. The structure–activity relationship of the St-based flocculants in sludge dewatering was obtained according to the theoretic simulation. The dewatering mechanisms was discussed in depth on the basis of the experimental and simulated results; besides, the FCMC and optimal dose can be predicted by the established structure–activity relationship. This current work offered a novel and valuable way to exploit and design of low-cost and high-performance graft natural polymeric flocculants applied in efficient conditioning of sludge.
format	article
author	Pan Hu Shaohang Shen Hu Yang
author_facet	Pan Hu Shaohang Shen Hu Yang
author_sort	Pan Hu
title	Evaluation of hydrophobically associating cationic starch-based flocculants in sludge dewatering
title_short	Evaluation of hydrophobically associating cationic starch-based flocculants in sludge dewatering
title_full	Evaluation of hydrophobically associating cationic starch-based flocculants in sludge dewatering
title_fullStr	Evaluation of hydrophobically associating cationic starch-based flocculants in sludge dewatering
title_full_unstemmed	Evaluation of hydrophobically associating cationic starch-based flocculants in sludge dewatering
title_sort	evaluation of hydrophobically associating cationic starch-based flocculants in sludge dewatering
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/416d9856d837421e91da6efebde181b8
work_keys_str_mv	AT panhu evaluationofhydrophobicallyassociatingcationicstarchbasedflocculantsinsludgedewatering AT shaohangshen evaluationofhydrophobicallyassociatingcationicstarchbasedflocculantsinsludgedewatering AT huyang evaluationofhydrophobicallyassociatingcationicstarchbasedflocculantsinsludgedewatering
_version_	1718379281159028736

Evaluation of hydrophobically associating cationic starch-based flocculants in sludge dewatering

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