Investigating the effects of different cationic charge flocculation polymers on municipal wastewater sludge dewatering

Abrahams, Megan; Aziz, Mujahid; Kasongo, Godwill

doi:10.2166/wpt.2021.046

Cited by 4 publications

(2 citation statements)

References 11 publications

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“…Since sludge is negatively charged, the cationic coagulant is more commonly applied for sludge conditioning. Cationic coagulants are mainly metal salt compounds, and ferric chloride, aluminum salt, and hydrotalcite hydroxide are usually used . When cationic coagulant is added, the sludge particles are electrically neutralized, and the repulsive force between sludge particles is lessened.…”

Section: The Methods Of Sludge Conditioning For Dehydrationmentioning

confidence: 99%

“…Cationic coagulants are mainly metal salt compounds, and ferric chloride, aluminum salt, and hydrotalcite hydroxide are usually used. 115 When cationic coagulant is added, the sludge particles are electrically neutralized, and the repulsive force between sludge particles is lessened. Then the sludge colloidal particles after the electric neutralization can be aggregated into large floccules to achieve good dehydration performance.…”

Section: Ultrasonication and Microwavementioning

confidence: 99%

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Dehydration Performance of Municipal Sludge and Its Dewatering Conditioning Methods: A Review

Jiang

Gao

Zhang

et al. 2023

Ind. Eng. Chem. Res.

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Municipal sludge is an inevitable byproduct during the treatment of wastewater, which is produced by sewage treatment plants in urban residential areas, and it contains pathogens, heavy metals, and other pollutants. Municipal sludge is suitable for application in energy utilization because of its high organic content and relatively low toxic matter. The high moisture content of municipal sludge brings huge difficulties to its harmless disposal and resource utilization. At present, the main method used for sludge dehydration is mechanical dewatering. However, the mud cake produced by this method still has a water content of up to 80%, which does not meet the current rigorous requirements. Therefore, the development of deep dehydration technology for sludge is imperative. In this paper, the basic properties and structure of sludge were summarized. As a key component of sludge flocs, extracellular polymeric substance (EPS) has received much attention in sludge dewatering conditioning. Meanwhile, the influencing factors of sludge dewatering were also fully elaborated, including sludge types, sewage hardness, surface charge, size distribution, and sludge viscosity. And the main methods of sludge dewatering treatment were comprehensively included, namely, the physical method, chemical method, biological method, and combined conditioning methods. The advantages and disadvantages of each method are mentioned, and their application situations were analyzed. Furthermore, comment was provided on the conditioning mechanism, adaptability, prospects, and limitations of the techniques for improving sludge dewatering. This systematic review related to sludge dewatering can not only provide reference information for the conditioning method but also benefit the exploitation of efficient and ecofriendly sludge dewatering technology.

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Section: The Methods Of Sludge Conditioning For Dehydrationmentioning

confidence: 99%

Section: Ultrasonication and Microwavementioning

confidence: 99%

Dehydration Performance of Municipal Sludge and Its Dewatering Conditioning Methods: A Review

Jiang

Gao

Zhang

et al. 2023

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

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Chemical conditioning of aerobically digested sludge using polyelectrolytes with different charge densities

Asghari,

Danesh,

Ahmadpour

et al. 2024

Appl Water Sci

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This research was carried out to evaluate the effects of different dosages (1.85–4.44 g kg−1 Ts−1) of three cationic polyelectrolytes with charge densities (CD) of 20%, 40%, and 60% on the dewatering properties of an aerobically digested sludge. The sludge was collected from the sludge processing line in a wastewater treatment plant in the city of Mashhad, Iran (MWWTP). To assess the sludge dewatering properties, parameters such as specific resistance to filtration, sludge cluster geometry, filtration rate, and filtrate turbidity and volume were measured. The experimental results were then compared with the effects of a reference polyelectrolyte that was used in the conditioning of the sludge in that treatment plant. The results indicated that the sludge samples treated with the polyelectrolyte of the highest CD matched better dewatering performance than the samples conditioned with the other two polyelectrolytes. This polyelectrolyte (60%CD) presented its best effects at the dosage of 4.07 g kg−1 Ts−1. With this dosage, its performance was similar to the performance of the reference polyelectrolyte at the dosage of 4.44 g kg−1 Ts−1.

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Empowering municipal wastewater treatment: Enhancing particulate organic carbon removal via chemical advanced primary treatment

Lasaki,

Maurer,

Schönberger

et al. 2023

Environmental Technology & Innovation

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Investigating the effects of different cationic charge flocculation polymers on municipal wastewater sludge dewatering

Cited by 4 publications

References 11 publications

Dehydration Performance of Municipal Sludge and Its Dewatering Conditioning Methods: A Review

Dehydration Performance of Municipal Sludge and Its Dewatering Conditioning Methods: A Review

Chemical conditioning of aerobically digested sludge using polyelectrolytes with different charge densities

Empowering municipal wastewater treatment: Enhancing particulate organic carbon removal via chemical advanced primary treatment

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