Sludge dewatering through H2O2 lysis and ultrasonication and recycle for energy by torrefaction to achieve zero waste: An environmental and economical friendly technology

Lin, Yi-Li; Zheng, Nai-Yun; Wang, Hsueh-Chien

doi:10.1016/j.rser.2021.111857

Cited by 17 publications

(2 citation statements)

References 41 publications

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“…In industrial applications, the individual or combined use of ultrasound, O 3 , and H 2 O 2 has been widely studied or has already been applied in industry. These methods have been studied to apply in many fields including sludge dewatering, dye industry effluent treatment, and cellulosic fiber wastewater treatment, and there have been successful application cases. − Thus, the combined process of ultrasound and O 3 or H 2 O 2 has a foundation in industrial applications. As a new type of solid waste, the waste CIGS solar cells will be largely produced in the coming future.…”

Section: Resultsmentioning

confidence: 99%

A Novel Combined Technology of Rich Reactive Oxygen Species and Ultrasound for the Decapsulation of Waste Cu(InGa)Se₂ Solar Cells

Huang

Lin

et al. 2023

ACS Sustainable Chem. Eng.

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The rapidly developing Cu(InGa)Se2 solar cells will face a large amount of scrapping in the next 5–10 years. Waste Cu(InGa)Se2 solar cells are rich in metal and organic resources. Decapsulation is the key step for resource recovery. However, there is a lack of environmentally friendly and efficient decapsulating method. In this study, a combined technology of rich reactive oxygen species and ultrasound was proposed for decapsulating waste Cu(InGa)Se2 solar cells. Ethylene-vinyl acetate, polyethylene terephthalate, and cell layer can be completely separated after 6 h ultrasound-O3 (10 g/h) or 4 h ultrasound-H2O2 (30 wt %) treatment. Under the attack of reactive oxygen species, C–O and C–C bonds in ethylene-vinyl acetate fractured. Structures including −CH3, crosslinking bridge, vinyl acetate side chain, and alkane chain were destroyed. The crosslinked ethylene-vinyl acetate network was damaged, resulting in the adhesion loss. Long-chain and cyclic ketones, esters, and alkane were mainly generated, which are non-toxic natural substances and even have a high value. The O3-ultrasound method can continuously generate reactive oxygen species, excessive O3 can spontaneously decompose into O2, and the solutions can be reused. This study might be the first time to propose the rich reactive oxygen species and ultrasound combined technology for decapsulating waste Cu(InGa)Se2 solar cells, which contributes to the environmentally friendly recovery.

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Section: Resultsmentioning

confidence: 99%

A Novel Combined Technology of Rich Reactive Oxygen Species and Ultrasound for the Decapsulation of Waste Cu(InGa)Se₂ Solar Cells

Huang

Lin

et al. 2023

ACS Sustainable Chem. Eng.

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“…al. [23] reported a mass yield of around 60 wt.% for the torrefaction of municipal wastewater sludge at 300 • C for 60 min. The relatively increasing ash content was the main reason for the higher mass yield in the case of pulp sludge compared with biomass.…”

Section: Mass and Energy Yieldmentioning

confidence: 99%

Torrefaction of Pulp Industry Sludge to Enhance Its Fuel Characteristics

2022

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Recently, under COP26, several countries agreed to phase-out coal from their energy systems. The torrefaction industry can take advantage of this, as the fuel characteristics of torrefied biomasses are comparable to those of coal. However, in terms of economic feasibility, torrefied biomass pellets are not yet competitive with coal without subsidies because of the high price of woody biomass. Thus, there is a need to produce torrefied pellets from low-cost feedstock; pulp industry sludge is one such feedstock. In this context, this study was focused on the torrefaction of pulp industry sludge. Torrefaction experiments were carried out using a continuous reactor, at temperatures of 250, 275, and 300 °C. The heating value of the sludge increased from 19 to 22 MJ/kg after torrefaction at 300 °C. The fixed carbon content increased from 16 wt.% for dried pulp sludge to 30 wt.% for torrefied pulp sludge. The fuel ratio was in the range of 0.27 to 0.61. The ash content of the pulp sludge was comparable to that of agricultural waste, i.e., around 12 wt.% (dry basis). The cellulose content in the sludge was reduced from 35 to 12 wt.% at 300 °C. Ash related issues such as slagging, fouling, and bed agglomeration tendency of the sludge were moderate. This study shows that torrefaction treatment can improve the fuel properties of pulp industry sludge to a level comparable to that of low-rank coal.

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Biohydrogen and Polyhydroxyalkanoates Coupled Production

de Mello,

de Souza Vandenberghe,

Vásquez

et al. 2024

Biofuel and Biorefinery Technologies

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Sludge dewatering through H2O2 lysis and ultrasonication and recycle for energy by torrefaction to achieve zero waste: An environmental and economical friendly technology

Cited by 17 publications

References 41 publications

A Novel Combined Technology of Rich Reactive Oxygen Species and Ultrasound for the Decapsulation of Waste Cu(InGa)Se₂ Solar Cells

A Novel Combined Technology of Rich Reactive Oxygen Species and Ultrasound for the Decapsulation of Waste Cu(InGa)Se₂ Solar Cells

Torrefaction of Pulp Industry Sludge to Enhance Its Fuel Characteristics

Biohydrogen and Polyhydroxyalkanoates Coupled Production

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Sludge dewatering through H2O2 lysis and ultrasonication and recycle for energy by torrefaction to achieve zero waste: An environmental and economical friendly technology

Cited by 17 publications

References 41 publications

A Novel Combined Technology of Rich Reactive Oxygen Species and Ultrasound for the Decapsulation of Waste Cu(InGa)Se2 Solar Cells

A Novel Combined Technology of Rich Reactive Oxygen Species and Ultrasound for the Decapsulation of Waste Cu(InGa)Se2 Solar Cells

Torrefaction of Pulp Industry Sludge to Enhance Its Fuel Characteristics

Biohydrogen and Polyhydroxyalkanoates Coupled Production

Contact Info

Product

Resources

About

A Novel Combined Technology of Rich Reactive Oxygen Species and Ultrasound for the Decapsulation of Waste Cu(InGa)Se₂ Solar Cells

A Novel Combined Technology of Rich Reactive Oxygen Species and Ultrasound for the Decapsulation of Waste Cu(InGa)Se₂ Solar Cells