Feasibility of improving wastewater sludge dewaterability by combination of cationic polyacrylamide and synthetic fibers for resource utilization

Yang, Yuchen; Zhou, Kai; Tian, Ganpei; Liu, Bo; Jiang, Zihou; Bian, Bo

doi:10.1016/j.seppur.2022.122620

Cited by 11 publications

(2 citation statements)

References 45 publications

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“…Coagulation/flocculation is based on the addition of chemicals to aggregate the (SS) into large and compacted flocs, enabling the removal of the bound water of sludge and improving its settleability. Likewise, regarding wastewater treatment, the efficiency of the coagulation/flocculation process to assist in sludge dewatering depends on the nature and physicochemical properties of the used chemical coagulants/flocculants, which are generally aluminum salts, iron salts, and acrylamide-based synthetic polymers [37,38].…”

Section: Chemical Methodsmentioning

confidence: 99%

Could Plant-Based Flocculants Substitute the Conventional Synthetic Chemicals in the Sludge Dewatering Process?

Hadj Mansour,

Othmani,

Ben Rebah

et al. 2023

Water

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Due its high water content, sewage sludge dewatering is not just a simple operation; rather, it is a challenging process and a costly management task. Its final handling is usually preceded by several dewatering steps, and among them is the conditioning process known as the flocculation stage, which is carried out using synthetic chemical reagents. Despite the abilities of these additives to reduce sludge volume and extract its bound waters, they are suspected to cause serious environmental and health threats. Their substitution by natural and efficient additives originating from plant extracts could thus be a safe and an eco-friendly alternative, overcoming ecosystem damages. It is within this context that the present review paper critically investigates the efficacy and feasibility of plant-based flocculants, aiming to enhance sludge dewatering and dispense with environmental burdens. To do so, the types of the conventional chemical flocculants, their drawbacks, and their impacts on the ecosystem and human health were addressed. In parallel, the potential dewatering efficiency of plant extracts toward sludge treatment was compiled, and their mechanistic dewatering paths performances were thoroughly discussed. The challenges associated with dewatered sludge and its potential exploitation were also highlighted to motivate scientific communities to further explore green resources for sludge processing. It is suggested that green resources such as Moringa, Cactus, Aloe, and Okra could be used as green flocculants instead of chemical ones, which would provide a promising and eco-sustainable approach to sludge dewatering and might represent a path towards an environmentally friendly and clean technology.

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Section: Chemical Methodsmentioning

confidence: 99%

Could Plant-Based Flocculants Substitute the Conventional Synthetic Chemicals in the Sludge Dewatering Process?

Hadj Mansour,

Othmani,

Ben Rebah

et al. 2023

Water

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show abstract

“…However, they also have many disadvantages, such as high dose, sensitivity to pH and share force, and biological toxicity caused by residual metal ions [ 4 ]. Synthetic polymeric flocculants including cationic polyacrylamide or combined materials are excellent in terms of dose and dewatering efficiency [ 18 ], but their cost is relatively high. However, such types of flocculants may cause secondary pollution and health hazards due to remaining unreacted monomers [ 4 ].…”

Section: Introductionmentioning

confidence: 99%

Production of Cationic Starch-Based Flocculants and Their Application in Thickening and Dewatering of the Municipal Sewage Sludge

Lekniute-Kyzike

Bendoraitienė

Navikaitė-Šnipaitienė

et al. 2023

Materials

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Polymer flocculants are used to promote solid–liquid separation processes in wastewater treatment technologies, and bio-based flocculants possess many advantages over conventional synthetic polymers. Potato starch microgranules were chemically modified and mechanically sheared to produce modified starch flocculants. The effectiveness of produced cationic starch (CS) and cross-linked cationic starch (CCS) flocculants in the thickening and dewatering of surplus activated sewage sludge was evaluated and compared with that of synthetic cationic flocculants (SCFs) The flocculation efficiency of SCF, CS, and CCS in sludge thickening was determined by measuring the filtration rate of treated surplus activated sludge. Comparing the optimal dose of SCFs and CCS flocculants needed for thickening, the CCS dose was more than 10 times higher, but a wide flocculation window was determined. The impact of used flocculants on the dewatering performance of surplus activated sludge at optimal dose conditions was investigated by measuring capillary suction time. The filtration efficiencies (dewaterability) of surplus activated sludge using SCF, CS, and CCS were 69, 67, and 72%, respectively. The study results imply that mechanically processed cross-linked cationic starch has a great potential to be used as an alternative green flocculant in surplus activated sludge thickening and dewatering operations in municipal sewage sludge treatment processes.

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Natural deep eutectic solvents pretreatments for sludge dewaterability improvement and subsequent volatile fatty acids production: Insights of sludge disintegration and metagenomic characterization

Liu,

Zhai,

et al. 2024

Chemical Engineering Journal

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Feasibility of improving wastewater sludge dewaterability by combination of cationic polyacrylamide and synthetic fibers for resource utilization

Cited by 11 publications

References 45 publications

Could Plant-Based Flocculants Substitute the Conventional Synthetic Chemicals in the Sludge Dewatering Process?

Could Plant-Based Flocculants Substitute the Conventional Synthetic Chemicals in the Sludge Dewatering Process?

Production of Cationic Starch-Based Flocculants and Their Application in Thickening and Dewatering of the Municipal Sewage Sludge

Natural deep eutectic solvents pretreatments for sludge dewaterability improvement and subsequent volatile fatty acids production: Insights of sludge disintegration and metagenomic characterization

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