Effects of Thickened Excess Sludge Pre-Treatment Using Hydrodynamic Cavitation for Anaerobic Digestion

Garlicka, Agnieszka; Żubrowska-Sudoł, Monika; Umiejewska, Katarzyna; Roubinek, O.; Palige, J.; Chmielewski, A.G.

doi:10.3390/en13102483

Cited by 21 publications

(20 citation statements)

References 23 publications

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“…It cannot be excluded that an almost insufficient percent share of disintegrated WAS in the total mixed sludge stream subject to the anaerobic digestion process; the occurrence of this phenomenon was one of the causes of the lack of an increase in the amount of produced biogas when the disintegration process was conducted at energy density of 150 kJ/L. Considering our own study results at the pilot scale for another type of mechanical disintegrator, however, where a considerable increase in biogas production was recorded when the disintegration process was conducted at 140 kJ/L [21], it was assumed that the primary parameter determining lack of expected results in this study was insufficient percent share of WAS subject to disintegration. In the case of disintegration of the entire WAS stream, however, even at low energy densities, the bioavailability of a significant part of the mixed sludge increases, resulting in an increase in biogas production, as documented in this study.…”

Section: Full Scale Experiments Results Effects Of Disintegration Of Thickened Waste Activated Sludge On Anaerobic Digestion Efficiencymentioning

confidence: 86%

Energy-Positive Disintegration of Waste Activated Sludge—Full Scale Study

et al. 2022

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This study aimed to evaluate the effects of mechanical disintegration of waste activated sludge (WAS) on full scale anaerobic digestion, considering the possibility of obtaining a positive energy balance. The results showed that an increase in energy density (εL) used in disintegration was accompanied by an increase in the release of organic compounds from sludge (SCOD increased from 211 ± 125 mg O2/L for εL = 0 kJ/L to 6292 ± 2860 mgO2/L for εL = 180 kJ/L). Some of them were volatile fatty acids. The percentage share of WAS subject to disintegration was also documented as a crucial parameter affecting the efficiency of biogas production. An increase in the value of this parameter from 25% to 100%, even at much lower εL used in disintegration (therefore with much smaller amounts of organic compounds released from sludge flocs) resulted in an increase in biogas production. Conducting disintegration of the entire stream of WAS directed to the fermentation tank at εL 30 kJ/L resulted in an increase in biogas production by 14.1%. Such a surplus would allow production of approximately 360 kWh/d net electricity. Mechanical disintegration of thickened WAS therefore may be an economically justifiable strategy for the intensification of anaerobic sludge stabilisation.

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Section: Full Scale Experiments Results Effects Of Disintegration Of Thickened Waste Activated Sludge On Anaerobic Digestion Efficiencymentioning

confidence: 86%

Energy-Positive Disintegration of Waste Activated Sludge—Full Scale Study

et al. 2022

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“…The test results are presented in Figure 5 with biogas and methane accumulation curves. The conducted study may be compared with the research presented by Garlicka et al [25] made in identical bioreactors. Here, waste-activated sludge was used without superelectronization, but the excess sludge was fed by hydrodynamic disintegration, during which a cavitation effect occurred.…”

Section: Production and Composition Of Biogasmentioning

confidence: 98%

The Influence of Low-Temperature Disintegration on the Co-Fermentation Process of Distillation Residue and Waste-Activated Sludge

et al. 2022

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Innovative low-temperature disintegration (process temperature 55 °C and oxygen concentration 0.2 mg/dm3) can be an economically rational technology to intensifying energy production from renewable sources. The proposed process can achieve a degree of disintegration—under optimal conditions—of about 50%, which is excellent when compared with other methods of feed pre-treatment. The low-temperature disintegration of distillation residue and waste-activated sludge before the co-fermentation process increased biogas production by 30% and methane production by 65% (over a 26 d duration). The obtained results confirm that the low-temperature disintegration method can be effectively used to pre-prepare this type of feed. At the same time, it was discovered that the Gompertz model can be used to mathematically describe the biogas accumulation curves in the methane co-fermentation processes of the tested feeds (the correlation coefficients were higher than 0.98).

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“…HC devices can be broadly classified into two categories, namely, with and without moving parts (Figure ). Devices with moving parts mainly constitute rotor-stator devices , or hydrosonic pumps . Rotor-stator devices as the name implies has a fixed stator and a movable (rotating) rotor.…”

Section: Hydrodynamic Cavitation For Intensifying Anaerobic Digestionmentioning

confidence: 99%

Valorizing Waste Biomass via Hydrodynamic Cavitation and Anaerobic Digestion

Nagarajan

Ranade

2021

Ind. Eng. Chem. Res.

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It is essential to valorize waste biomass and promote a circular economy for realizing sustainability and decarbonization goals. In this review, we specifically focus on anaerobic digestion (AD) intensified via hydrodynamic cavitation (HC) and modeling as an effective biomass valorization strategy. AD is known to generate renewable energy (biogas) and fertilizer (digestate) and is therefore aligned with the circular economy framework and has the potential to decarbonize the transportation, energy, and heat sectors, which contribute a major share to the current global carbon emissions. The AD-based pathway, though robust, has key challenges such as poor carbon conversion and subpar biogas yields coupled with long residence times. This is mainly due to the recalcitrance offered by the feedstock. HC-based biomass pretreatment is critically reviewed here as a promising AD intensification strategy to overcome this recalcitrance. HC devices and their key aspects of design and scale-up are discussed. Vortex-based HC devices were found to be superior to conventional linear flow HC devices in terms of pretreatment performance and ease of scale up. The use of reaction engineering models of AD for overall optimization of biomass valorization is also discussed. The need for developing an intermediate modeling approach between empirical models and complex biochemical pathway-based models is highlighted. Such an intermediate approach requires simple biomethane potential (BMP) measurements for obtaining essential model parameters. With such parameters obtained from BMP data, the model was found to be useful for simulating and optimizing performance of AD. A prospective AD-based biorefinery is briefly discussed with multiple allied valorization pathways. This review will be useful to researchers and practicing engineers for realizing effective valorization of waste biomass.

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Effects of Thickened Excess Sludge Pre-Treatment Using Hydrodynamic Cavitation for Anaerobic Digestion

Cited by 21 publications

References 23 publications

Energy-Positive Disintegration of Waste Activated Sludge—Full Scale Study

Energy-Positive Disintegration of Waste Activated Sludge—Full Scale Study

The Influence of Low-Temperature Disintegration on the Co-Fermentation Process of Distillation Residue and Waste-Activated Sludge

Valorizing Waste Biomass via Hydrodynamic Cavitation and Anaerobic Digestion

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