Unraveling the impacts of Cu+-based treatments on sludge dewaterability: The overlooked role of Cu3+

Li, Xiaoping; Zhai, Yunbo; Xu, Zhixiang; Li, Liming; Ren, Wanying; Xie, Yu; Li, Caiting; Zhu, Yun; Xu, Min

doi:10.1016/j.cej.2022.141106

Cited by 16 publications

(3 citation statements)

References 51 publications

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“…46 When present in TB-EPS, they can effectively lock water through hydrogen bonds. 47,48 3.3. Changes in sludge characteristics 3.3.1.…”

Section: Variation In Sludge Dewatering Performancementioning

confidence: 99%

Achievement of waste sludge deep dehydration under acidic conditions with polydimethyldiallylammonium chloride and ferric chloride: performance and mechanism

Lv,

Wang,

Liu

et al. 2024

RSC Adv.

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“…46 When present in TB-EPS, they can effectively lock water through hydrogen bonds. 47,48 3.3. Changes in sludge characteristics 3.3.1.…”

Section: Variation In Sludge Dewatering Performancementioning

confidence: 99%

Achievement of waste sludge deep dehydration under acidic conditions with polydimethyldiallylammonium chloride and ferric chloride: performance and mechanism

Lv,

Wang,

Liu

et al. 2024

RSC Adv.

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“…Generally, the fluorophores in unknown natural waters are mainly identified and semiquantified by EEM-parallel factor (EEM-PARAFAC) analysis or the fluorescence region zoning method and are classified into tyrosine-like, tryptophan-like microbial byproducts and humic acid-like, fulvic acid-like compounds. , However, recent studies have found that the contribution of substances to organic fluorescence is often ignored. For example, polysaccharides in sludge complexed with fluorescent groups show stronger fluorescence contributions than proteins and humic acids, , and polystyrene microplastics show characteristic peaks in the water that correspond to their concentration, while even 50 μg/L polycyclic aromatic hydrocarbons (PAHs) may lead to an enhancement of wastewater fluorescence (enhanced by 2–17 times) or a minor fluorescence quenching (cut by 5–30%) .…”

Section: Introductionmentioning

confidence: 99%

In-Depth Identification of the Sources and Features of Organic Fluorescent Structures in the Sewage Sludge Hydrothermal Aqueous Phase

Liu,

Jin,

Zhao

et al. 2024

ACS EST Water

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Fluorophores in natural water are usually considered to be humic acid-like and protein-like compounds, while the fluorophores in the hydrothermal carbonization aqueous phase (HTC-AP) prepared under intense hydrothermal conditions (160−280 °C and 2−10 MPa) may not be these compounds. For that, we employed hydrogen nuclear magnetic resonance, Raman spectra, and gas chromatography-mass spectrometry analysis to recognize fluorophores. The results indicate that the fluorescent structures in HTC-AP are mainly rigid planar structures with large conjugated systems resulting from hydrothermal condensation and cross-linking reactions, including aromatics, N-heterocyclics, and alicycles. Specifically, nitrogencontaining heterocycles may be the fluorescence sources of C355 (Em/Ex = 355/275 nm), C405 (Em/Ex = 405/260, 345 nm), and C445 (Em/Ex = 445/ 250, 360 nm) compounds in HTC-AP. In comparison, the fluorescence sources of C300 (Em/Ex = 300/270 nm) and C380 (Em/Ex = 380/315 nm) include alicyclic compounds and aromatic organics, and aromatic organics are the only fluorescence source of C400 (Em/Ex = 400/250, 300 nm). The C300 and C380 component fluorescences are mainly provided by low-molecular-weight organics and hydrophobic acids, respectively. The source of the fluorescent organics was verified using the Fe(II)-based advanced oxidation system. This study can provide a reference to facilitate the simple identification of organics in HTC-AP.

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“…Over the last few decades, the global production of waste-activated sludge (WAS) has been continuously increasing, which poses a potential threat to the environment [1]. According to the statistics, China produces 60 million tons of sewage sludge (80% water content) with an annually increasing rate of 10%, while the European Union produces approximately 50 million tons of sewage sludge per year and the United States produces 40 million tons [2].…”

Section: Introductionmentioning

confidence: 99%

Enhanced Recovery of Alginate-like Extracellular Polymers (ALE) from Waste-Activated Sludge Using Sodium Percarbonate: Performance and Characteristics

Liu,

Ren,

Zhai

et al. 2023

Sustainability

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Resource recovery from waste-activated sludge is of great practical significance to achieve sustainable wastewater treatment. Alginate-like extracellular polymers (ALE), a typical class of extracellular polymer substances, are valuable bio-based products with broad application prospects. However, due to the low extraction efficiency of the current method, its practical applications are severely limited. In this study, sodium percarbonate (SPC) was first applied to enhance ALE extraction from conventional activated sludge to replace the sodium carbonate (SC) in the heating-SC method. The results showed that the ALE extracted by the heating-SPC method increased by 30.11% compared to the heating-SC method, and the alginate equivalent was slightly improved. Monosaccharide composition analysis showed that the ALE primarily comprised galactose and glucose, indicating the potential for biomedical applications. The particle size distribution and extracellular polymeric substances (EPS) composition of the sludge indicated that SPC could improve the cracking of the sludge flocs and the organic release. In addition, due to SPC’s ability to oxidize, the molecular composition of the ALE extract changed. In conclusion, SPC used as a substitute for SC in the heating-SC method could be effectively employed to recover ALE from waste-activated sludge. In future studies, further optimization of the operational conditions needs to be considered.

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Unraveling the impacts of Cu+-based treatments on sludge dewaterability: The overlooked role of Cu3+

Cited by 16 publications

References 51 publications

Achievement of waste sludge deep dehydration under acidic conditions with polydimethyldiallylammonium chloride and ferric chloride: performance and mechanism

Achievement of waste sludge deep dehydration under acidic conditions with polydimethyldiallylammonium chloride and ferric chloride: performance and mechanism

In-Depth Identification of the Sources and Features of Organic Fluorescent Structures in the Sewage Sludge Hydrothermal Aqueous Phase

Enhanced Recovery of Alginate-like Extracellular Polymers (ALE) from Waste-Activated Sludge Using Sodium Percarbonate: Performance and Characteristics

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