Pretreatment methods to enhance anaerobic digestion of organic solid waste

Ariunbaatar, Javkhlan; Pánico, Antonio; Esposito, Giovanni; Pirozzi, Francesco; Lens, Piet N.L.

doi:10.1016/j.apenergy.2014.02.035

Cited by 785 publications

(467 citation statements)

References 131 publications

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“…The increase of WAS solubilisation and parallel decrease on methane production at high pre-treatment temperature and long times, indicate that some soluble but nonbiodegradable compounds were produced during severe thermal pre-treatment. This is probably because of the production of melanoidins, as reported by many studies (Ariunbaatar et al, 2014;Xue et al, 2015).…”

Section: Optimization Of the Th Processmentioning

confidence: 75%

“…A new perspective is being generated due to the increase of the amount of sewage sludge and its disposal limitation by reason of strict environmental regulations, effective methods of making full use of sludge's rich organic components are on continuing interest (Zhang et al, 2014). Anaerobic digestion still appears as the most suitable method to treat the sludge due to its limited environmental impact, high potential for energy recovery as biogas, and reduction in the amount of biosolids to be disposed (Ariunbaatar et al, 2014). It is well known that for solid wastes the hydrolysis (liquefaction or solubilisation) step is the main rate limiting factor for digestion.…”

Section: Introductionmentioning

confidence: 99%

“…According to some researches, heating temperature and duration of the thermal pre-treatment depend on the nature of the sludge (Ariunbaatar et al, 2014;Appels et al, 2008). The generally accepted operation conditions vary between 150 and 230 C temperature, with time ranging from 20 to 60 min.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Optimization of a thermal hydrolysis process for sludge pre-treatment

Sapkaite

Barrado

Fdz‐Polanco

et al. 2017

Journal of Environmental Management

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a b s t r a c tAt industrial scale, thermal hydrolysis is the most used process to enhance biodegradability of the sludge produced in wastewater treatment plants. Through statistically guided Box-Behnken experimental design, the present study analyses the effect of TH as pre-treatment applied to activated sludge. The selected process variables were temperature (130-180 C), time (5e50 min) and decompression mode (slow or steam-explosion effect), and the parameters evaluated were sludge solubilisation and methane production by anaerobic digestion. A quadratic polynomial model was generated to compare the process performance for the 15 different combinations of operation conditions by modifying the process variables evaluated. The statistical analysis performed exhibited that methane production and solubility were significantly affected by pre-treatment time and temperature. During high intensity pre-treatment (high temperature and long times), the solubility increased sharply while the methane production exhibited the opposite behaviour, indicating the formation of some soluble but non-biodegradable materials. Therefore, solubilisation is not a reliable parameter to quantify the efficiency of a thermal hydrolysis pre-treatment, since it is not directly related to methane production. Based on the operational parameters optimization, the estimated optimal thermal hydrolysis conditions to enhance of sewage sludge digestion were: 140e170 C heating temperature, 5e35min residence time, and one sudden decompression.

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Section: Optimization Of the Th Processmentioning

confidence: 75%

Section: Introductionmentioning

confidence: 99%

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Optimization of a thermal hydrolysis process for sludge pre-treatment

Sapkaite

Barrado

Fdz‐Polanco

et al. 2017

Journal of Environmental Management

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“…fatty wastes) and pretreatment of the feedstock prior to its introduction to the digester, methods combining both of the mentioned should also be taken into consideration [6,7]. Benefits as well as drawbacks of the techniques mentioned above are well documented in literature [3,4,6,8,9]. However, the overwhelming part of these publications relates to sewage sludge.…”

Section: Introductionmentioning

confidence: 99%

Pretreatment methods as a means of boosting methane production from sewage sludge and its mixtures with grease trap sludge

Grosser

Neczaj

2017

E3S Web Conf.

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Abstract.The main objective of this study was to determine the applicability of the selected pretreatment methods as a means of intensification of methane production from sewage sludge as well as its mixtures with grease trap sludge. The addition of the fat rich material to the digester treating sewage sludge resulted in an increased methane yield as well as volatile solids (VS) removal of up to 36% (from 134.75 mL/g VS to 182.84 mL/g VS). Furthermore, thermochemical pretreatment of the co-digestion mixture resulted in an approximately 76% higher methane yield as compared to the untreated sewage sludge. The energy balance showed that, for both materials ultrasonic pretreatment and thermochemical pretreatment has an energy self-sufficiency. All of the tested models fit the experimental data with coefficients of determination higher than 0.96.

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“…The slow degradation rate of activated sludge in the process of anaerobic digestion is due to the rate limiting step of sludge hydrolysis. Therefore, the pre-treatment of activated sludge by physical (thermal), chemical (eg pH adjustment, oxidation process using ozone or hydrogen peroxide), mechanical (hydrodynamic cavitation, ultrasonication), and biological (enzymes) methods can improve the subsequent anaerobic digestion [1][2][3]. Although the methods are different, the aim of all of them is partial or complete disintegration of bacteria cells, ie release of organic substances present inside of cells to the liquid phase.…”

Section: Introductionmentioning

confidence: 99%

Considerations of Impact of Venturi Effect on Mesophilic Digestion

Machnicka

Grűbel

Mirota

2015

Ecological Chemistry and Engineering S

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Hydrodynamic cavitation caused by the Venturi effect is one of the most promising methods of sewage sludge pre-treatment. This study has been carried out to investigate the effect of hydrodynamic cavitation on disintegration of activated sludge foam and mesophilic fermentation. Cavitation was generated in standard Venturi tube with the diameter ratio β = d0/d1 = 0.30, working at σ = 0.249. Detailed Computational Fluid Design (CFD) analysis in class of k-∈ model of internal flow has been presented. Obtained analytical investigation results confirmed the effect of strong disruption of microorganism cells and release of free organic substance into the liquid phase. After a short (30 minutes) pre-treatment, chemical oxygen demand increased by 8.63 times while Müller's disintegration degree was 50%. Moreover, undertaken mesophilic digestion trials brought significant improvement in biogas production.

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Pretreatment methods to enhance anaerobic digestion of organic solid waste

Cited by 785 publications

References 131 publications

Optimization of a thermal hydrolysis process for sludge pre-treatment

Optimization of a thermal hydrolysis process for sludge pre-treatment

Pretreatment methods as a means of boosting methane production from sewage sludge and its mixtures with grease trap sludge

Considerations of Impact of Venturi Effect on Mesophilic Digestion

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