Dewatering efficiency of sewage sludge during Fe2+-activated persulfate oxidation: Effect of hydrophobic/hydrophilic properties of sludge EPS

Wei, Liangliang; Xia, Xinhui; Zhu, Fengyi; Li, Qiaoyang; Xue, Mao; Jian-ju, LI; Sun, Bo; Jiang, Junqiu; Zhao, Qingliang

doi:10.1016/j.watres.2020.115903

Cited by 93 publications

(13 citation statements)

References 55 publications

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“…Fe ions and their oxides have also been widely studied, owing to their environmentally friendly, non-toxic, and low-cost characteristics (Wei et al, 2020). For example, Fe 2+ -activated PS and PMS have been proven to be one of the most efficient pathways for sulfate radical generation (Equations 28 and 29) (Xiao et al, 2020).…”

Section: Transition Metal Ions and Metal Oxidesmentioning

confidence: 99%

A Review Study on Sulfate-Radical-Based Advanced Oxidation Processes for Domestic/Industrial Wastewater Treatment: Degradation, Efficiency, and Mechanism

et al. 2020

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High levels of toxic organic pollutants commonly detected during domestic/industrial wastewater treatment have been attracting research attention globally because they seriously threaten human health. Sulfate-radical-based advanced oxidation processes (SR-AOPs) have been successfully used in wastewater treatment, such as that containing antibiotics, pesticides, and persistent organic pollutants, for refractory contaminant degradation. This review summarizes activation methods, including physical, chemical, and other coupling approaches, for efficient generation of sulfate radicals and evaluates their applications and economic feasibility. The degradation behavior as well as the efficiency of the generated sulfate radicals of typical domestic and industrial wastewater treatment is investigated. The categories and characteristics of the intermediates are also evaluated. The role of sulfate radicals, their kinetic characteristics, and possible mechanisms for organic elimination are assessed. In the last section, current difficulties and future perspectives of SR-AOPs for wastewater treatment are summarized.

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Section: Transition Metal Ions and Metal Oxidesmentioning

confidence: 99%

A Review Study on Sulfate-Radical-Based Advanced Oxidation Processes for Domestic/Industrial Wastewater Treatment: Degradation, Efficiency, and Mechanism

et al. 2020

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“…However, EPS, one of main components of sludge, has the characteristics of strong hydrophilicity due to high negative charges, and is readily to form a stable gelatinous suspension system binding with a huge amount of water 4 , 5 . It is thus quite difficult to achieve a desired liquid and solid separation effect in sludge 10 , 11 . Suitable increase in hydrophobicity of sludge might destroy the hydration, form a rigid porous microstructure in sludge cakes and well build water drainage channels originated in the formed hydrophobic regions, and thus improve the sludge dewaterability 12 – 14 .…”

Section: Introductionmentioning

confidence: 99%

“…In addition to traditional inorganic coagulants and synthetic flocculants including polyaluminium chloride, ferric chloride, and polyacrylamide derivatives 11 , 21 – 23 , natural polymeric flocculants have recently gained much more attentions due to their wide source, low toxicity, and high efficiency 20 , 24 , 25 . Besides, various functional groups including different hydrophilic and hydrophobic ones could be conveniently introduced onto the polymeric backbone to improve the flocculation effect by various chemical modifications including graft copolymerization, esterification and etherification, due to their abundant active functional groups contained 26 , 27 .…”

Section: Introductionmentioning

confidence: 99%

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

Shen

Yang

2021

Sci Rep

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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.

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“…Commonly used sludge conditioning methods are physical conditioning (Carrasco and Gao 2019, Mobaraki et al 2018, Ramachandra and Devatha 2020, chemical conditioning (Ge et al 2019, Wang et al 2018) and biological conditioning (Chen et al 2015, Huo et al 2014, Liu et al 2016a). Advanced oxidation technology has become a subject of research interest in the area of chemical conditioning due to the advantages of low secondary pollution and fast reaction times (Bian et al 2021, Chen et al 2021, Kim et al 2016, Ni et al 2019, Wei et al 2020, Zhang et al 2020b. Our previous research used Fe 2+ activated sodium persulfate (SPS) combined with phosphogypsum (PG) for sludge conditioning and found both oxidation and skeleton building effects (Shi et al 2015).…”

Section: Introductionmentioning

confidence: 99%

Adaptability of Organic Matter and Solid Content to Fe2+/Persulfate and Skeleton Builder Conditioner for Waste Activated Sludge Dewatering

Shi

Zhou

et al. 2021

Preprint

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Sludge conditioning is important for improved dewatering, with the sludge characteristics impacting the effect of conditioning. A composite conditioner, Fe2+ activated sodium persulfate (Fe2+/SPS) combined with phosphogypsum (PG), was used to examine its impact on sludges with different organic content or different solid content. Response surface optimization analysis shows that when the best conditioning is achieved, the reduction of the specific resistance to filtration is not sensitive to organic matter content, but the dewatering performance of the sludge is greatly affected by the solid content. The oxidation role of Fe2+/SPS and the skeleton builder role of PG, together, affect the conditioning, with oxidation playing a major role in conditioning, especially for greater organic matter content. The organic content also affects the effectiveness of the skeleton builder more than the solid content. Changes in PG significantly impacts the optimal molar ratio and dosage of Fe2+/SPS. Sludge with greater solid content requires greater Fe2+/SPS dosage to provide stronger oxidation to destroy flocs. The composite conditioning decreases the content of extracellular polymeric substances and proteins/polysaccharides with the decrease in protein content being significantly greater than that of polysaccharides, these decreases improve the sludge dewaterability.

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Dewatering efficiency of sewage sludge during Fe2+-activated persulfate oxidation: Effect of hydrophobic/hydrophilic properties of sludge EPS

Cited by 93 publications

References 55 publications

A Review Study on Sulfate-Radical-Based Advanced Oxidation Processes for Domestic/Industrial Wastewater Treatment: Degradation, Efficiency, and Mechanism

A Review Study on Sulfate-Radical-Based Advanced Oxidation Processes for Domestic/Industrial Wastewater Treatment: Degradation, Efficiency, and Mechanism

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

Adaptability of Organic Matter and Solid Content to Fe2+/Persulfate and Skeleton Builder Conditioner for Waste Activated Sludge Dewatering

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