The influence of the energy absorbed from microwave pretreatment on biogas production from secondary wastewater sludge

Sólyom, Katalin; Mato, Rafael B.; Pérez-Elvira, S.I.; Cocero, Marı́a José

doi:10.1016/j.biortech.2011.09.052

Cited by 87 publications

(43 citation statements)

References 24 publications

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“…These values constitute 49-56% increase compared to untreated sludge. What is more, power of microwaves applied did not affect significantly the methane potential, which is in agreement with previous studies [21,22].…”

Section: Biogas Potentialsupporting

confidence: 93%

Influence of Microwave Pre-Treatment on the Digestion and Higienisation of Waste Activated Sludge/Wpływ Dezintegracji Mikrofalowej Na Proces Fermentacji Oraz Higienizacji Nadmiernych Osadów Ściekowych

Bohdziewicz

Kuglarz

Grűbel

2014

Ecological Chemistry and Engineering S

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Abstract:The article presents the results of determining the most appropriate conditions of microwave sludge pre-treatment (500-1200 W), prior to its anaerobic digestion in a continuous mode. The assessment of the pre-treatment conditions (microwave power, sludge temperature after pre-treatment) was based on: the release of organic (COD, protein) and inorganic (NH4 + , PO43-) substances into liquid, the quantity of methane produced, sludge higienisation and the susceptibility of the pre-treated sludge to dewatering. The power of the microwaves applied did not play significant role on the pre-treatment effectiveness. Taking into account the fact that sludge pre-treatment by microwave irradiation requires the delivery of energy, the pre-treatment by microwaves of higher power (1200 W) and resulting in sludge temperature of 70°C was recommended for further experiments. Sludge pre-treatment by means of microwave irradiation as a pre-treatment step influenced the effectiveness of the subsequent anaerobic digestion, conducted in continuous conditions, in a positive way. The largest amount of biogas was obtained for HRT in the range of 15-20 days. As compared to the sludge which did not undergo pre-treatment, daily biogas production and biogas yield increased by 18-41% and 13-35% respectively. The combination of microwave pre-treatment and mesophilic anaerobic digestion ensured the elimination of pathogens (Salmonella spp., Escherichia coli).

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Section: Biogas Potentialsupporting

confidence: 93%

Influence of Microwave Pre-Treatment on the Digestion and Higienisation of Waste Activated Sludge/Wpływ Dezintegracji Mikrofalowej Na Proces Fermentacji Oraz Higienizacji Nadmiernych Osadów Ściekowych

Bohdziewicz

Kuglarz

Grűbel

2014

Ecological Chemistry and Engineering S

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“…Results from the comparison of conventional heating and microwave irradiation for wastewater and sludge pre-treatment are contradictionally. Detach of non-thermal effects of microwave from thermal effects is difficult, because mainly of high temperature ramp and hot-spot heating effects occurred during microwave irradiation (Sólyom et al, 2011). It can be noticed, that in practice the same condition for conventionaland microwave heating in real material matrix cannot be ensured.…”

Section: Introductionmentioning

confidence: 99%

Continuously flow microwave pre-treatment for enhanced anaerobic biodegradability of dairy industry sludge

Lemmer¹,

Hodúr²,

Beszédes³

2017

Agriculture Journal

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“…(Beszédes et al, 2011;Jackowiak et al, 2011;Li et al, 2012;Passos et al, 2013;Sapci et al, 2013;Shahriari et al, 2012) as well as of primary and secondary waste activated sludges (WAS) (Eskicioglu et al, 2007;Zheng et al, 2009). Microwaves can improve the rupturing of the cell walls and complex compounds, thus enhancing anaerobic hydrolysis in two different ways (Solyom et al, 2011). Firstly, the thermal effect corresponds to degradation caused by temperature increase.…”

Section: Introductionmentioning

confidence: 99%

Impact of microwave pre-treatment on the batch anaerobic digestion of two-phase olive mill solid residue: a kinetic approach

Rincón

Canales

Martı́n³

et al. 2016

Grasas y Aceites

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SUMMARY:The effect of a microwave (MW) pre-treatment on two-phase olive mill solid residue (OMSR) or alperujo with a view to enhancing its anaerobic digestibility was studied. The MW pre-treatment was carried out at a power of 800 W and at a targeted temperature of 50 °C using different heating rates and holding times. The following specific energies were applied: 4377 kJ·kg TS −1 (MW1), 4830 kJ·kg TS −1 (MW2), 7170 kJ·kg TS −1 (MW3) and 7660 kJ·kg TS −1 (MW4). The maximum methane yield, 395±1 mL CH 4 ·g VS added −1 , was obtained for MW4. The effect of the pre-treatment on the kinetics of the process was also studied. The methane production curves generated during the batch tests showed a first exponential stage and a second sigmoidal stage for all the cases studied. In the first stage, the kinetic constant for the pre-treatment MW1 was 54.8% higher than that obtained for untreated OMSR.KEYWORDS: Alperujo; Anaerobic digestion; Batch; Kinetics; Microwave RESUMEN: Impacto del pretratamiento con microondas sobre la digestión anaerobia en régimen discontinuo de residuos sólidos de almazaras de dos fases: un enfoque cinético. El efecto del pretratamiento con microondas (MW) sobre el residuo semisólido procedente de la elaboración del aceite de oliva por el sistema de dos fases o alperujo fue estudiado con el objeto de aumentar su digestibilidad anaerobia. El pretratamiento fue llevado a cabo a una potencia de 800W y a una temperatura de 50 °C empleándose distintas velocidades de calentamiento así como diferentes tiempos de espera para obtener dichas condiciones. Las siguientes energías específicas fueron aplicadas: 4377 kJ·kg TS −1 (MW1), 4830 kJ·kg TS −1 (MW2), 7170 kJ·kg TS −1 (MW3) y 7660 kJ·kg TS −1 (MW4). El máximo rendimiento 395±1 mL CH 4 ·g SV añadidos −1 se obtuvo para MW4. El efecto del pretratamiento en la cinética del proceso también fue estudiado. Las curvas de producción de metano durante los ensayos mostraron una etapa exponencial y una sigmoidal en todos los casos. En la primera etapa, la constante cinética para MW1 fue 54.8% mayor que la obtenida para el alperujo sin pretratar.

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The influence of the energy absorbed from microwave pretreatment on biogas production from secondary wastewater sludge

Cited by 87 publications

References 24 publications

Influence of Microwave Pre-Treatment on the Digestion and Higienisation of Waste Activated Sludge/Wpływ Dezintegracji Mikrofalowej Na Proces Fermentacji Oraz Higienizacji Nadmiernych Osadów Ściekowych

Influence of Microwave Pre-Treatment on the Digestion and Higienisation of Waste Activated Sludge/Wpływ Dezintegracji Mikrofalowej Na Proces Fermentacji Oraz Higienizacji Nadmiernych Osadów Ściekowych

Continuously flow microwave pre-treatment for enhanced anaerobic biodegradability of dairy industry sludge

Impact of microwave pre-treatment on the batch anaerobic digestion of two-phase olive mill solid residue: a kinetic approach

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