Upgrading of anaerobic digestion of waste activated sludge by ultrasonic pretreatment

Wang, Qunhui; Kuninobu, Masaaki; Kakimoto, Kohji; Ogawa, Hiroaki; Kato, Yasuhiko

doi:10.1016/s0960-8524(98)00155-2

Cited by 163 publications

(72 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The term ultrasound is used to define sound energy in a frequency range of 20-100 kHz that is above human hearing (Pilli et al 2011). Wang et al (1999 applied ultrasound or sonication pretreatment in the anaerobic digestion of WAS.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Soluble Protein and Biochemical Methane Potential of Apple Biowaste by Different Pretreatment

Tulun

Bilgin

2018

Earth Syst Environ

View full text Add to dashboard Cite

The purpose of this research is to evaluate the anaerobic digestion of apple pomace waste in terms of pretreatment. In this study, the main pretreatment strategies for apple pomace include: ultrasound (35 and 53 kHz), thermal and chemical (pH 5 and 10). For each pretreatment method four different temperatures are selected as 25, 40, 50, and 60 °C, and operation times are selected as 5th, 15th, 30th, and 45th minutes. The effects on pretreatment were investigated by measuring changes in the soluble protein concentrations of pretreated wastes and the enhanced anaerobic digestion was investigated by using the biochemical methane potential (BMP) assay. The soluble proteins of ultrasonic (35 kHz at 60 °C, 45th min), ultrasonic (53 kHz at 60 °C , 45th min), chemical (pH 5 at 60 °C, 5th min), chemical (pH 10 at 60 °C, 30th min) and thermal chemical (40 °C, 15th min) pretreatment apple pomace were 74.3, 75.6, 48.7, 85.5 and 58.6% higher, respectively. The results indicated that apple pomace treated with 53 kHz at 60 °C, 45th min had the highest biogas yield of 1519 mL CH 4 /g VSS.day after anaerobic digestion, which was on average 40.9% higher than raw pomace.

show abstract

Section: Introductionmentioning

confidence: 99%

Enhanced Soluble Protein and Biochemical Methane Potential of Apple Biowaste by Different Pretreatment

Tulun

Bilgin

2018

Earth Syst Environ

View full text Add to dashboard Cite

show abstract

“…Wang et al (1999) studied the effects of ultrasonic pre-treatment on the solubilization of waste-activated sludge and on methane generation. Ultrasonic pre-treatment increased the methane production by 64 % as compared with the untreated sludge.…”

Section: Need For Pre-treatment Operationsmentioning

confidence: 99%

Kinetic studies on anaerobic co-digestion of ultrasonic disintegrated feed and biomass and its effect substantiated by microcalorimetry

Priyadarshini

Vaishnavi

Murugan

et al. 2014

Int. J. Environ. Sci. Technol.

View full text Add to dashboard Cite

Studies were carried out on anaerobic codigestion of primary and secondary excess sludge obtained from tannery effluent treatment plant. Anaerobic biomass collected from a treatment plant was used as the source of micro-organisms. The optimum feed to micro-organism ratio was evaluated as 0.7 on the basis of volatile solids reduction cum gas production. Both feed and anaerobic biomass were subjected to ultrasonic pre-treatment in order to enhance the digestion process. Experiments carried out on batch mode showed significant increase in the gas production for pre-treated feed and biomass. Optimum pretreatment durations were evaluated as 5 min for feed and 3 min for anaerobic biomass. Heat flow analyses of the anaerobic biomass using isothermal microcalorimetry throw light on different stages of digestion process. The effect of ultrasonic pre-treatment on anaerobic biomass was also substantiated using this technique. The heat energy released by pre-treated and untreated anaerobic biomass was evaluated as 16.3 and 7.6 kJ/kg, respectively. Kinetic analysis revealed that the overall rate constant of digestion process increased by 1.5 times due to pre-treatment. However, the initial lag time increased by about 20 % for the optimally pre-treated sample compared to untreated sample. Modified Gompertz equation was used to model, and the parameters were evaluated. The significance of this work lies on energy production (bio gas) and at the same time increasing the maintenance metabolism rate thereby minimizing excess sludge biomass generation.

show abstract

“…Normally the biological hydrolysis is identified as the rate-limiting step 4) . To reduce the impact of the rate-limiting step, pretreatment is required such as thermal, alkaline, ultrasonic or mechanical disintegration [5][6][7] . These treatments can accelerate the hydrolysis of waste sludge and reduce the particle size, which subsequently improves the anaerobic digestion efficiency.…”

Section: Introductionmentioning

confidence: 99%

Highly-efﬁcient Anaerobic Digestion of Refractory Organic Waste Using Subcritical Water Hydrolysis as Pretreatment Process

Miyashiro

Wang

Yang

et al. 2012

Japanese J. Wat. Treat. Biol.

View full text Add to dashboard Cite

In this study, subcritical water hydrolysis was developed to treat refractory organic waste as a pretreatment process for high-efficiency anaerobic digestion. Sewage sludge and cyanobacteria as representative refractory waste were used. Different treatment temperatures were investigated and methane fermentation from the two pretreated wastes by subcritical water hydrolysis were carried out. The results showed that the optimum treatment temperature is 180°C. 0.8 g/l of formic acid, 8.6 g/l acetic acid, 9.9 g/l propionic acid and 0.6 g/l butyric acid were produced from sewage sludge and 405.8 µg/l of microcystin in cyanobacteria was completely removed in the pretreatment process at 180°C. The cumulative methane production was 43.2 ml and 54 ml from pretreated sewage sludge and cyanobacteria, respectively. Both of them were much higher than those produced from untreated one. Therefore, efficient anaerobic digestion of refractory organic waste using subcritical water hydrolysis as pretreatment process could be achieved.

show abstract

Upgrading of anaerobic digestion of waste activated sludge by ultrasonic pretreatment

Cited by 163 publications

References 7 publications

Enhanced Soluble Protein and Biochemical Methane Potential of Apple Biowaste by Different Pretreatment

Enhanced Soluble Protein and Biochemical Methane Potential of Apple Biowaste by Different Pretreatment

Kinetic studies on anaerobic co-digestion of ultrasonic disintegrated feed and biomass and its effect substantiated by microcalorimetry

Highly-efﬁcient Anaerobic Digestion of Refractory Organic Waste Using Subcritical Water Hydrolysis as Pretreatment Process

Contact Info

Product

Resources

About