Enhanced sludge dewaterability by a novel MnFe2O4-Biochar activated peroxymonosulfate process combined with Tannic acid

Yang, Xian; Zeng, Liuting; Huang, Jinjia; Mo, Zhihua; Guan, Zhijie; Sun, Shuiyu; Liang, Jialin; Huang, Shaosong

doi:10.1016/j.cej.2021.132280

Cited by 61 publications

(8 citation statements)

References 65 publications

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“…This further demonstrated that NH conditioning could efficiently destruct EPS structures and thus release the polysaccharides from the inner layer to the outer layer. In contrast to some AOPs, which nonselectively degrade the polysaccharides, , the NH treatment here only transferred (not degraded) them from TB-EPS to LB-EPS and/or S-EPS. As the most abundant component of EPS, polysaccharide-based biomaterials have been reported to be recovered as high value-added products. − With further separation and purification, it showed great potential to recover high-value polysaccharide-based resources.…”

Section: Resultsmentioning

confidence: 65%

“…7−10 For instance, the protein and polysaccharides in the EPS layers were reduced by about 60% when conditioned by peroxymonosulfate-based AOPs. 11 Besides, coagulation/flocculation and acid/base treatment were also widely used in practice but were hindered due to the efficiency and secondary environmental risks (Table 1).…”

Section: ■ Introductionmentioning

confidence: 99%

“…The promotion of sludge dewaterability is usually accompanied by the descent of biopolymer concentration (such as proteins and polysaccharides). Numerous studies based on persulfate conditioning have shown a significant decrease of proteins and/or polysaccharides. − For instance, the protein and polysaccharides in the EPS layers were reduced by about 60% when conditioned by peroxymonosulfate-based AOPs . Besides, coagulation/flocculation and acid/base treatment were also widely used in practice but were hindered due to the efficiency and secondary environmental risks (Table ).…”

Section: Introductionmentioning

confidence: 99%

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Simultaneously Enhanced Dewaterability and Biopolymer Release of Sludge by Natural Deep Eutectic Solvents: Performance, Mechanisms, and Insights of Theoretical Calculations

Zhai

Zhu

et al. 2022

ACS Sustainable Chem. Eng.

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The dewatering and resource recovery of wasteactivated sludge (WAS) seemed to be two contradictory processes due to the high moisture content induced by the extracellular polymer substances, which mainly consist of proteins and polysaccharides. Natural deep eutectic solvents (NADESs) were proposed to synergistically enhance dewaterability and biopolymer release of WAS. It showed that NADES with low-temperature pretreatment can significantly improve the dewaterability and release of valuable resources. With the addition of 1.0 mL of NADES combined with 60 °C thermal treatment for 120 min, the capillary suction time (CST) of sludge significantly decreased from 75.9 ± 7.5 to 30.5 ± 1.6 s, and 11.83 mg/L of the total amino acids (AAs) was obtained. The protein and polysaccharide contents were increased to 876.48 and 213.42 mg/L, respectively. This study indicated that NADES combined with low-temperature pretreatment is a green, cost-effective, and environmentally friendly method to improve sludge dewaterability and resource recovery simultaneously. The theoretical calculation results suggested that the generation of NADES•••AAs aggregates is an exothermic reaction and proceeds nonspontaneously. A good correlation is also found between the theoretically calculated free-energy change and the concentrations of AAs. On the basis of this study, the biopolymers from WAS can be recovered as value-added resources, enabling a recycling concept within the circular economy vision. The theoretical calculation can be used to guide future experiments for screening highly selective and effective NADES toward resource recovery from WAS.

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Section: Resultsmentioning

confidence: 65%

Section: ■ Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Simultaneously Enhanced Dewaterability and Biopolymer Release of Sludge by Natural Deep Eutectic Solvents: Performance, Mechanisms, and Insights of Theoretical Calculations

Zhai

Zhu

et al. 2022

ACS Sustainable Chem. Eng.

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“…With the increase in tannic acid, the conversion of valence substances in the water can be accelerated to generate more free radicals in the system. Thus, tannic acid merges with macromolecules to form flocs (Yang. X., et al 2022) which increases the efficiency of coagulation.…”

Section: Effect Of Concentration Of Tannic Acid On Microplastic Coagu...mentioning

confidence: 99%

“…After that, the coagulation efficiency decreases. This is because the addition of excessive tannic acid can quench free radicals and produce tannic oxide, weaken the efficiency, and destroy the floc structure, and reduce the release of bound water, resulting in a decrease in dewaterability (Yang, et al 2022).…”

Section: Effect Of Concentration Of Tannic Acid On Microplastic Coagu...mentioning

confidence: 99%

Utilization of chicken eggshell and chitosan as coagulants for microplastic removal from aquatic system

Liemin

Sembiring

Hadiyanto

2023

J. Bioresour. Environ. Sci.

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Smaller size plastics known as microplastics are harmful for marine biota as well as humans. One of the common methods for the removal of microplastics from water is coagulation. Chicken eggshells and chitosan are two natural ingredients which contain useful content for the coagulation process. Therefore, this paper describes the effect of concentration of eggshells and chitosan as coagulants in the separation of microplastic from water using RSM (Response Surface Methodology). The effect of tannic acid concentration as coagulation aid was also analyzed in this paper. The coagulants were varied with concentration of 1.5-8.5 g/100 mL and tannic acid concentration was 3-17 mg/100 mL. The result of this study showed coagulation with the highest efficiency occurred when 8.5 g/100 mL of chicken eggshell coagulant (89.14%) and 10 g/100 mL chitosan coagulant (75.67%) was added. Optimum operation occurred after the addition of coagulant aid in the amount of 7 mg/100 mL with chicken eggshell and 15 mg/100 mL with chitosan.

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Biochar‐Enhanced Ozonation for Sewage Treatment

Ge,,

Zhu,

et al. 2023

Biochar Applications for Wastewater Treatment

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Enhanced sludge dewaterability by a novel MnFe2O4-Biochar activated peroxymonosulfate process combined with Tannic acid

Cited by 61 publications

References 65 publications

Simultaneously Enhanced Dewaterability and Biopolymer Release of Sludge by Natural Deep Eutectic Solvents: Performance, Mechanisms, and Insights of Theoretical Calculations

Simultaneously Enhanced Dewaterability and Biopolymer Release of Sludge by Natural Deep Eutectic Solvents: Performance, Mechanisms, and Insights of Theoretical Calculations

Utilization of chicken eggshell and chitosan as coagulants for microplastic removal from aquatic system

Biochar‐Enhanced Ozonation for Sewage Treatment

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