Microwave and thermal pretreatment as methods for increasing the biogas potential of secondary sludge from municipal wastewater treatment plants

Kuglarz, Mariusz; Karakashev, Dimitar Borisov; Angelidaki, Irini

doi:10.1016/j.biortech.2013.02.001

Cited by 183 publications

(99 citation statements)

References 28 publications

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“…Furthermore, the increase of temperature above 70°C caused a significant decrease in ammonia and phosphates concentration. This is in agreement with previous studies [6,21].…”

Section: Inorganic Matter Releasesupporting

confidence: 94%

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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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“…Furthermore, the increase of temperature above 70°C caused a significant decrease in ammonia and phosphates concentration. This is in agreement with previous studies [6,21].…”

Section: Inorganic Matter Releasesupporting

confidence: 94%

“…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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“…Response SCOD coefficients in the fitted models for Y 1 -Y 16 indicate that the degree of sludge disintegration is closely related to the rate of change of factors x 3 (i.e., the H 2 O 2 to sludge ratio) and x 2 (pH). Moreover, based on these results, the contributions of three first-order effects (x 1 , x 2 x 3 ), three interaction effects (x 1 x 2 , x 1 x 3 , and x 2 x 3 ), and three second-order effects (x 2 1 , x 2 2 , and x 2 3 ) to the results were ranked based on the obtained coefficients, i.e., the values obtained forˇi.…”

Section: Quadratic Models For All Response Variablesmentioning

confidence: 97%

Multivariate analysis of sludge disintegration by microwave–hydrogen peroxide pretreatment process

Wang

Gui

et al. 2015

Journal of Hazardous Materials

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h i g h l i g h t s• Investigation of TSS, H 2 O 2 dosage, pH and interactions on MW sludge pretreatment.• Quadratic models were drawn for 16 response variables with good predictive ability.• Models could optimize the treatment process for multiple disintegration objectives. a r t i c l e i n f o ) has been shown to offer considerable advantages owing to its flexible control, low overall cost, and resulting higher soluble chemical oxygen demand (SCOD); accordingly, the method has been proposed recently as a means of improving sludge disintegration. However, the key factor controlling this sludge pretreatment process, pH, has received insufficient attention to date. To address this, the response surface approach (central composite design) was applied to evaluate the effects of total suspended solids (TSS, 2-20 g/L), pH (4-10), and H 2 O 2 dosage (0-2 w/w) and their interactions on 16 response variables (e.g., SCOD released , pH, H 2 O 2 remaining ). The results demonstrated that all three factors affect sludge disintegration significantly, and no pronounced interactions between response variables were observed during disintegration, except for three variables (TCOD, TSS remaining , and H 2 O 2 remaining ). Quadratic predictive models were constructed for all 16 response variables (R 2 : 0.871-0.991). Taking soluble chemical oxygen demand (SCOD) as an example, the model and coefficients derived above were able to predict the performance of microwave pretreatment (enhanced by H 2 O 2 and pH adjustment) from previously published studies. The predictive models developed were able to optimize the treatment process for multiple disintegration objectives.

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“…With the increase in microwave power and processing time, the pH and ammonia nitrogen of the treated sludge increased significantly, but still within the range of appropriate conditions for AD. This change happened mainly because the intracellular substances including enzymes released, resulting in pH change and conversion of organic nitrogen compounds to ammonia nitrogen [4,12,19]. The SCOD also increased after microwave treatment, but when Coefficient of determination R 2 = 0.934 Table 3.…”

Section: Modeling and Optimizing Combined Alkali And Microwave Pretrementioning

confidence: 99%

“…The range of NaOH dosage was chosen according to previous papers [16][17], and a processing time of 24 h was applied. The applied microwave power for treatment is 240 W, which is moderate compared to conditions in other studies [4,18]. This value is determined based on preliminary experiments.…”

Section: Modeling and Optimizing Combined Alkali And Microwave Pretrementioning

confidence: 99%

Optimization and Performance of Moderate Combined Alkali and Microwave Pretreatment for Anaerobic Digestion of Waste-Activated Sludge

Jiang¹,

Liu²,

Ding³

et al. 2018

Pol. J. Environ. Stud.

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Microwave and thermal pretreatment as methods for increasing the biogas potential of secondary sludge from municipal wastewater treatment plants

Cited by 183 publications

References 28 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

Multivariate analysis of sludge disintegration by microwave–hydrogen peroxide pretreatment process

Optimization and Performance of Moderate Combined Alkali and Microwave Pretreatment for Anaerobic Digestion of Waste-Activated Sludge

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