Optimizing flocculation of digestate to increase circularity in manure treatment

Marrit van der Wal; Zandrie Borneman; Kitty Nijmeijer

doi:10.1016/j.biteb.2023.101561

Optimizing flocculation of digestate to increase circularity in manure treatment

Marrit van der Wal
, Zandrie Borneman
, Kitty Nijmeijer (Corresponding author)

Research output: Contribution to journal › Article › Academic › peer-review

4 Citations (Scopus)

126 Downloads (Pure)

Abstract

The flocculation of (co-)digested cattle and pig manure has rarely been investigated, leading to a rather intuitive use of flocculants in manure treatment processes, resulting in overdosing and increasing costs. Here, we investigate the effect of molecular weight, charge density and branching of reference and commercially available flocculants by establishing the optimal flocculant dosage and the corresponding maximum organic matter removal. Higher molecular weight flocculants show increased turbidity removal as result of their long chains corresponding to a higher amount adsorption sites. Results presented show that polymers with an increased cationic charge density give moderate and unstable flocculation due to the low amounts of non-charged parts essential for the hydrophobic interactions and hydrogen bonding. Further, the results show that a linear high molecular weight flocculant with a nonionic or a low anionic charge density is the most effective as it reached the highest organic matter removal at a low dosage.

Original language	English
Article number	101561
Number of pages	8
Journal	Bioresource Technology Reports
Volume	23
DOIs	https://doi.org/10.1016/j.biteb.2023.101561
Publication status	Published - Sept 2023

Bibliographical note

Funding Information:
This publication is part of the project “No Time to Waste” with project number ENPPS.LIFT.019.018 of the research program LIFT which is (partly) financed by the Dutch Research Council (NWO) . We thank Brahim Mezari for his assistance regarding the solid-state NMR and SNF Floerger for donating the cationic PAM flocculants.

Funding

This publication is part of the project “No Time to Waste” with project number ENPPS.LIFT.019.018 of the research program LIFT which is (partly) financed by the Dutch Research Council (NWO) . We thank Brahim Mezari for his assistance regarding the solid-state NMR and SNF Floerger for donating the cationic PAM flocculants. This publication is part of the project “No Time to Waste” with project number ENPPS.LIFT.019.018 of the research program LIFT which is (partly) financed by the Dutch Research Council (NWO). We thank Brahim Mezari for his assistance regarding the solid-state NMR and SNF Floerger for donating the cationic PAM flocculants.

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

SDG 7 Affordable and Clean Energy

Keywords

Branching
Charge density
Flocculation
Manure digestate
Molecular weight

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10.1016/j.biteb.2023.101561

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Cite this

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title = "Optimizing flocculation of digestate to increase circularity in manure treatment",

abstract = "The flocculation of (co-)digested cattle and pig manure has rarely been investigated, leading to a rather intuitive use of flocculants in manure treatment processes, resulting in overdosing and increasing costs. Here, we investigate the effect of molecular weight, charge density and branching of reference and commercially available flocculants by establishing the optimal flocculant dosage and the corresponding maximum organic matter removal. Higher molecular weight flocculants show increased turbidity removal as result of their long chains corresponding to a higher amount adsorption sites. Results presented show that polymers with an increased cationic charge density give moderate and unstable flocculation due to the low amounts of non-charged parts essential for the hydrophobic interactions and hydrogen bonding. Further, the results show that a linear high molecular weight flocculant with a nonionic or a low anionic charge density is the most effective as it reached the highest organic matter removal at a low dosage.",

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author = "\{van der Wal\}, Marrit and Zandrie Borneman and Kitty Nijmeijer",

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year = "2023",

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AU - van der Wal, Marrit

AU - Borneman, Zandrie

AU - Nijmeijer, Kitty

N1 - Funding Information: This publication is part of the project “No Time to Waste” with project number ENPPS.LIFT.019.018 of the research program LIFT which is (partly) financed by the Dutch Research Council (NWO) . We thank Brahim Mezari for his assistance regarding the solid-state NMR and SNF Floerger for donating the cationic PAM flocculants.

PY - 2023/9

Y1 - 2023/9

N2 - The flocculation of (co-)digested cattle and pig manure has rarely been investigated, leading to a rather intuitive use of flocculants in manure treatment processes, resulting in overdosing and increasing costs. Here, we investigate the effect of molecular weight, charge density and branching of reference and commercially available flocculants by establishing the optimal flocculant dosage and the corresponding maximum organic matter removal. Higher molecular weight flocculants show increased turbidity removal as result of their long chains corresponding to a higher amount adsorption sites. Results presented show that polymers with an increased cationic charge density give moderate and unstable flocculation due to the low amounts of non-charged parts essential for the hydrophobic interactions and hydrogen bonding. Further, the results show that a linear high molecular weight flocculant with a nonionic or a low anionic charge density is the most effective as it reached the highest organic matter removal at a low dosage.

AB - The flocculation of (co-)digested cattle and pig manure has rarely been investigated, leading to a rather intuitive use of flocculants in manure treatment processes, resulting in overdosing and increasing costs. Here, we investigate the effect of molecular weight, charge density and branching of reference and commercially available flocculants by establishing the optimal flocculant dosage and the corresponding maximum organic matter removal. Higher molecular weight flocculants show increased turbidity removal as result of their long chains corresponding to a higher amount adsorption sites. Results presented show that polymers with an increased cationic charge density give moderate and unstable flocculation due to the low amounts of non-charged parts essential for the hydrophobic interactions and hydrogen bonding. Further, the results show that a linear high molecular weight flocculant with a nonionic or a low anionic charge density is the most effective as it reached the highest organic matter removal at a low dosage.

KW - Branching

KW - Charge density

KW - Flocculation

KW - Manure digestate

KW - Molecular weight

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SN - 2589-014X

VL - 23

JO - Bioresource Technology Reports

JF - Bioresource Technology Reports

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ER -

Optimizing flocculation of digestate to increase circularity in manure treatment

Abstract

Bibliographical note

Funding

UN SDGs

Keywords

Access to Document

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Cite this