Evaluation of the combined effect of sodium persulfate and thermal hydrolysis on sludge dewatering performance

Chen, Kai; Liu, Jingxin; Huang, Simian; Mei, Meng; Chen, Si; Wang, Teng; Li, Jinping

doi:10.1007/s11356-020-11123-1

Cited by 17 publications

(13 citation statements)

References 49 publications

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“…Zhang et al (2017) succeeded to improve dewatering of activated sludge by using titanium salt coagulants (TSCs) in combination with magnetic nano‐particles. Chen, Liu, et al (2020) and Chen, Tao, et al (2020) significantly increased sludge dewatering efficiency by acidifying sludge with oxalic acid. In this study, the parameters Normalized Capillary Suction Time (CST) and Specific Resistance to Filtration (SRF) were evaluated as performance indicators of dewatering.…”

Section: Introductionmentioning

confidence: 99%

“…They investigated the effects associated with the reactions of hydrogen peroxide (H 2 O 2 ), Fe 3+ , and CTAB on the degradation of EPS (Extracellular Polymeric Substances) of sludge. In another study, Chen, Liu, et al (2020) and Chen, Tao, et al (2020) evaluated the combined effect of sodium persulfate and thermal hydrolysis process on sludge dewatering. In this study, operation parameters were optimized by surface response method (RSM) and EPS and SRF factors were analyzed in each experiment.…”

Section: Introductionmentioning

confidence: 99%

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Improvement of wastewater sludge dewatering using ferric chloride, aluminum sulfate, and calcium oxide (experimental investigation and descriptive statistical analysis)

Ranjbar

Karrabi

Danesh

et al. 2021

Water Environment Research

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In this research, application of chemical conditioners for the conditioning of sludge and their effects on the improvement of sludge thickening of the wastewater treatment plant in the city of Bojnourd (Iran) is investigated. The concentration of chemical conditioners, pH and coagulation and flocculation time is from among the parameters studied in this research work. The results obtained indicate that sludge volume reduction for the chemical conditioners used, including Ferric Chloride (FeCl 3 ), Aluminum Sulfate (Al 2 (SO 4 ) 3 ), and Calcium Oxide (CaO) are 41, 17, and 33 percent, respectively. The optimal concentration for FeCl 3 , Al 2 (SO 4 ) 3, and CaO are 550, 1100, and 292 mg/L, respectively, and the optimal values of pH are 9, 7.5, and 10, respectively. The time to filtration (TTF) and reduction in sludge moisture content (SMC) for Ferric Chloride, Aluminum Sulfate, and Calcium Oxide are 45 s and 6.2%, 135 s and 3.3%, 190 s and 2.4% respectively. © 2021 Water Environment Federation • Practitioner points• Investigating the sludge conditioning by Ferric Chloride, Aluminum Sulfate, and Calcium Oxide. • Determining the optimal concentration, pH, and coagulation/flocculation time.• Calculating the time to filtration (TTF) and reduction in sludge moisture content (SMC). • Predicting the settled sludge volume using descriptive statistical analysis.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Improvement of wastewater sludge dewatering using ferric chloride, aluminum sulfate, and calcium oxide (experimental investigation and descriptive statistical analysis)

Ranjbar

Karrabi

Danesh

et al. 2021

Water Environment Research

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“…In addition, hydrothermal treatment with high temperature and high pressure is more conducive to free radical generation, compared with conventional heat treatment. Chen et al (2020) made use of sodium persulfate coupled thermal hydrolysis (200 °C, 101 min) process to improve sludge dewatering performance. However, few previous studies have reported the effects of temperature on the PDS/PMS activation efficiency by ZVI during sludge conditioning.…”

Section: Introductionmentioning

confidence: 99%

Enhanced dewaterability of waste-activated sludge with zero-valent iron-activated persulfate oxidation under mild hydrothermal conditions

Zhu

et al. 2022

Water Science and Technology

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A novel technique to enhance sludge dewaterability with zero-valent iron-activated persulfate (ZVI/PDS) and hydrothermal treatment (HT) under mild temperature was proposed in this study. Key operating parameters were considered to study their influences on the dewaterability of sludge. Comparative studies of organic matter, especially extracellular polymeric substances (EPS), were analyzed carefully to reveal the mechanisms involved. The results indicated that the specific resistance to filtration was declined by 86.72%, and the capillary suction time was reduced by 72.35% compared with the raw sludge under optimal conditions of 100 mg/g TSS ZVI and 200 mg/g TSS PDS doses at 120 °C. Soluble protein and fulvic acid-like in EPS were the key components affecting the sludge dewatering performance. The disappearance of the peak in the amide III led to a decrease in hydrophilic functional groups, which helped to improve sludge dewaterability.

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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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Evaluation of the combined effect of sodium persulfate and thermal hydrolysis on sludge dewatering performance

Cited by 17 publications

References 49 publications

Improvement of wastewater sludge dewatering using ferric chloride, aluminum sulfate, and calcium oxide (experimental investigation and descriptive statistical analysis)

Improvement of wastewater sludge dewatering using ferric chloride, aluminum sulfate, and calcium oxide (experimental investigation and descriptive statistical analysis)

Enhanced dewaterability of waste-activated sludge with zero-valent iron-activated persulfate oxidation under mild hydrothermal conditions

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

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