Anaerobic digestion of activated sludge after pressure-assisted ozonation

Cheng, Chia-Jung; Peng, Hong

doi:10.1016/j.biortech.2013.04.058

Cited by 27 publications

(13 citation statements)

References 33 publications

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“…Later, it was found that this technique could improve the solubility of activated sludge, thus enhance the solids reduction and biogas production in the anaerobic digestion of PAO treated activated sludge [17,18]. In one of the most recent studies, PAO was reported to be able to disrupt the C. vulgaris cells for lipid extraction, in which the extracted lipid was weighed to quantify the cell disruption, however no other quantification indicators was examined and compared [19].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Cell Disruption of Chlorella Vulgaris by Pressure-Assisted Ozonation and Ultrasonication

et al. 2016

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This study evaluated the effectiveness of pressure-assisted ozonation (PAO) in Chlorella vulgaris (C. vulgaris) cell disruption, and compared the disruption result with that of the ultrasonication (US) by using four quantification indicators: cell counting, ultra violet (UV) absorbance, turbidity and visible light absorbance. It was found that under the condition of 0.8 MPa and 80 cycles, PAO treatment achieved cell rupture of 80.3%, with the power of 1080 W and treatment time of 60 min, US achieved cell rupture of 83.8%. Cell counting was a reliable indicator and applicable to both PAO and US treatments. Turbidity and visible light absorbance gave similar results and featured as the simplest operation. UV absorbance reflected the metabolite release due to cell breakage; however, it was less reproducible when it was applied to quantify the cell rupture by PAO. Its trend indicated that during cell disruption metabolite degradation occurred, especially after significant rupture in the case of excessive PAO treatment. The cellular morphology of C. vulgaris cells during PAO and US treatments was investigated by scanning electron microscope (SEM) which certified that the cells damage was caused by both physical and chemical attack.

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Section: Introductionmentioning

confidence: 99%

Evaluation of Cell Disruption of Chlorella Vulgaris by Pressure-Assisted Ozonation and Ultrasonication

et al. 2016

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“…Obviously, in the first stage, the PAHs adsorbed on the sludge granules surfaces were released into the liquid phase during the initial stage of ozonation because of the solubilization of extracellular polymeric substance. And then, the dissolved PAHs in the liquid phase degraded together with the sludge reduction [28]. This infers that a low O 3 concentration may lead to a significant increase in the concentrations of PAHs in the wastewater.…”

Section: Degradation Kinetics Of Pahsmentioning

confidence: 97%

“…Firstly, the PAHs were released from the solid phase to the liquid phase during the process of membranolysis; secondly, the dissolved O 3 oxidized the PAHs distributed in the liquid phase; lastly the PAHs adsorbed on the solid phase were directly oxidized by the dissolved O 3 . Moreover, the chemical structures of the organic substances were significantly altered by O 3 compared to their parent compounds, leading to an increase of the biodegradability of the solution[28]. The results shown in Supporting InformationFig.…”

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confidence: 96%

Mechanism of Ozone Oxidation of Polycyclic Aromatic Hydrocarbons During the Reduction of Coking Wastewater Sludge

Lin

Liao

et al. 2016

CLEAN Soil Air Water

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Activated coking wastewater sludge is a significant problem, due to the content of adsorbed hydrophobic organic micro-pollutants which are adsorbed. Here we discuss an O 3 fluidized bed reactor (FBR) process able to stabilize and reduce the coking sludge, and also removing 16 target polycyclic aromatic hydrocarbons (PAHs) adsorbed onto the sludge. The degradation efficiencies and influential factors affecting the sludge ozonation, such as the concentration of O 3 and of H 2 O 2 , UV irradiation, and the initial pH were investigated. The results indicate that the target PAHs present in the activated coking sludge, especially those with high molecular weight can be effectively removed by O 3 FBR. However, the concentration of O 3 plays an important role in the degradation of the target PAHs because a low concentration can generate an increase in the concentrations of PAHs in the liquid phase of the activated coking sludge. Due to the synergistic effect (S > 0), increasing the concentration of H 2 O 2 and increasing the pH value, can improve the removal of most of the target PAHs. The degradation kinetics of the target PAHs are assigned to a pseudo first-order model. In this process, the solubilization rate of the activated coking sludge reached about 68.2% and the target PAHs adsorbed on it were removed by >95% at 500 mg O 3 g À1 SS.

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“…So far, thermal, ultrasonication, freezing and thawing, and chemical oxidation have been investigated to improve sludge dewaterability. [7][8][9][10][11][12] Among all the developed methods, advanced oxidation processes (AOPs) have recently shown their superiority in sludge disintegration and dewatering.…”

Section: Introductionmentioning

confidence: 99%

Enhanced dewaterability of waste activated sludge by a combined use of permanganate and peroxymonosulfate

Luo

Yuan

et al. 2019

RSC Adv.

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Anaerobic digestion of activated sludge after pressure-assisted ozonation

Cited by 27 publications

References 33 publications

Evaluation of Cell Disruption of Chlorella Vulgaris by Pressure-Assisted Ozonation and Ultrasonication

Evaluation of Cell Disruption of Chlorella Vulgaris by Pressure-Assisted Ozonation and Ultrasonication

Mechanism of Ozone Oxidation of Polycyclic Aromatic Hydrocarbons During the Reduction of Coking Wastewater Sludge

Enhanced dewaterability of waste activated sludge by a combined use of permanganate and peroxymonosulfate

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