Enhanced Wet Oxidation of Excess Sludge from Pharmaceutical Wastewater Treatment by NaOH

Zhu, Yuting; Zeng, Xu; Fang, Kun

doi:10.3390/catal13071070

Cited by 4 publications

(2 citation statements)

References 32 publications

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“…Experiments were carried out in a SUS316 autoclave reactor [24]. The total inner volume of the reactor was 100 mL.…”

Section: Reaction Systemmentioning

confidence: 99%

High-Performance Catalytic Wet Oxidation of Excess Activated Sludge Derived from Pharmaceutical Wastewater Treatment Process over a Cu/γ-Al2O3 Catalyst

Chu,

Zeng,

Lin

et al. 2023

Water

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The performance of catalytic wet oxidation of excess activated sludge derived from pharmaceutical wastewater treatment over a Cu/γ-Al2O3 catalyst was investigated. The experiments were performed with a stainless steel autoclave reactor by using the prepared Cu/γ-Al2O3 catalyst. The effects of reaction conditions were examined, including additional catalyst amount, reaction temperature, time, and initial oxygen pressure. Results demonstrated that the catalyst, fabricated via co-precipitating method, has excellent catalytic performance. Through the study on condition optimization, the highest removal rates of volatile suspended solids (VSS, 93.6%) and total chemical oxygen demand (TCOD, 76.5%) were acquired with the reaction temperature 260 °C, time 60 min, initial oxygen pressure 1.0 MPa, and the prepared catalyst 5.0 g/L. The volatile fatty acids (VFAs) produced from the wet oxidation of sludge included acetic (mainly), propanoic, isobutyric, and isovaleric acids, which have great potential for the utilization as organic carbon sources in biological wastewater treatment plant. These results demonstrated that the proposed method, catalytic wet oxidation over Cu/γ-Al2O3 catalyst, is effective for treating excess activated sludge and resource utilization of organic carbon in the sludge.

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“…Experiments were carried out in a SUS316 autoclave reactor [24]. The total inner volume of the reactor was 100 mL.…”

Section: Reaction Systemmentioning

confidence: 99%

High-Performance Catalytic Wet Oxidation of Excess Activated Sludge Derived from Pharmaceutical Wastewater Treatment Process over a Cu/γ-Al2O3 Catalyst

Chu,

Zeng,

Lin

et al. 2023

Water

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“…In recent years, advanced oxidation processes (AOPs) have attracted widespread attention due to their high efficiency in the degradation of hazardous and toxic organic contaminants [12][13][14]. Among them, wet oxidation (WO) exhibited a high potential for the removal of hazardous contaminants [15][16][17][18]. Because of the high oxidation activity of free radical agents, organic compounds could be oxidized to small molecular organic carboxylic acids such as acetic, formic, and oxalic acids, and even CO 2 and H 2 O [19,20].…”

Section: Introductionmentioning

confidence: 99%

The Catalytic Wet Oxidation of Excess Activated Sludge from a Coal Chemical Wastewater Treatment Process

Wang,

Qin,

Zheng

et al. 2023

Catalysts

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An improved catalytic wet oxidation method for the disposal of excess activated sludge from a coal chemical wastewater treatment process by using the prepared Cu-Ce/γ-Al2O3 catalyst was reported. The effects of catalyst dosage, reaction temperature and time, and initial oxygen pressure on the degradation of the sludge were investigated. The maximum removal rate of volatile suspended solids, 93.2%, was achieved at 260 °C for 60 min with the catalyst 7.0 g·L−1 and initial oxygen pressure 1.0 MPa. The removal rate of chemical oxygen demand was 78.3% under the same conditions. The production of volatile fatty acids, including mainly acetic acid, propanoic acid, and isobutyric acid, increased with the increasing temperature. These acids have the potential to be carbon sources for the biological treatment of wastewater. Scanning electron microscopy images showed that the sludge became a loose porous structure, which is beneficial for dewatering performance. The results of an energy dispersive spectroscopy analysis illustrated that the carbon element in the sludge substantially migrated from solid to liquid phases. Therefore, these results demonstrated that the proposed catalytic wet oxidation method offers a promising pathway for the disposal and utilization of excess activated sludge from the coal chemical wastewater treatment process.

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Alkaline hydrothermal cracking effect and substance transformation characteristics of caprolactam-containing sludge

Zheng,

Shao,

Zhao

et al. 2024

Environmental Pollution

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Enhanced Wet Oxidation of Excess Sludge from Pharmaceutical Wastewater Treatment by NaOH

Cited by 4 publications

References 32 publications

High-Performance Catalytic Wet Oxidation of Excess Activated Sludge Derived from Pharmaceutical Wastewater Treatment Process over a Cu/γ-Al2O3 Catalyst

High-Performance Catalytic Wet Oxidation of Excess Activated Sludge Derived from Pharmaceutical Wastewater Treatment Process over a Cu/γ-Al2O3 Catalyst

The Catalytic Wet Oxidation of Excess Activated Sludge from a Coal Chemical Wastewater Treatment Process

Alkaline hydrothermal cracking effect and substance transformation characteristics of caprolactam-containing sludge

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