Energy efficiency of pre-treating excess sewage sludge with microwave irradiation

Tang, Bing; Yu, Linfeng; Huang, Shaosong; Luo, Jin; Zhuo, Ying

doi:10.1016/j.biortech.2010.01.132

Cited by 104 publications

(61 citation statements)

References 28 publications

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“…This result is consistent with results and a linear model reported previously in the literature [21]. They found TSS (or water content) was the most important factor that influenced the solubilization of solid materials [40]. However, water has a high thermal capacity and can absorb more energy with a relatively small increase in temperature.…”

Section: Optimization Of the Mw-h 2 O 2 Process For Organic Matter Resupporting

confidence: 93%

“…Thus, increasing the concentration of sludge treated can significantly reduce energy consumption and overall operating costs, especially in large-scale applications. The maximum sludge concentrations achieved to date for microwave pretreatment in closed-vessel systems were as high as 34 g/L [40] and 118.5 g/L [22]; such high sludge concentrations typically require less energy consumption per unit of dry sludge. Thus, high TSS is recommended considering the economic feasibility of MW pre-treatment process, In the hybrid process (with H 2 O 2 ) of an open system, the control and elimination of overflowing foam requires further study, particularly when used to treat very high concentrations of sludge owing to the of undesirable heavy foam.…”

Section: Optimization Of the Mw-h 2 O 2 Process For Organic Matter Rementioning

confidence: 99%

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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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Section: Optimization Of the Mw-h 2 O 2 Process For Organic Matter Resupporting

confidence: 93%

Section: Optimization Of the Mw-h 2 O 2 Process For Organic Matter Rementioning

confidence: 99%

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

Wang

Gui

et al. 2015

Journal of Hazardous Materials

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“…Microwave treatment was performed using a laboratory unit equipped with magnetrons of the following powers: 500, 800, 1000 and 1200 W. The disintegration was performed in closed vessels and the volume of sludge treated in one run amounted to 1 dm 3 . The temperature of the sludge was gradually increased by 10°C, -within the range of 20°C and ~100°C.…”

Section: Description Of the Pre-treatmentmentioning

confidence: 99%

“…Accordingly, the main purpose of its disintegration is to disrupt cell membranes and, thus lysis microbial cells. Both lead to a release of polymeric substances in a soluble form into liquid phase [3,4].…”

Section: Introductionmentioning

confidence: 99%

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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“…This advantageous and beneficial feature of microwave irradiation is caused by the effect of high frequency electromagnetic field on the secondary and tertiary structure of proteins, which can manifested in the decreased stability and the enhanced disintegration degree of sludge particles (Tang et al, 2010). It has been also concluded, that the increment in the solubility of carbohydrate compounds of sludge was approximately 10-15% higher, than the improvement in protein solubilisation after microwave treatment (Appels et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

Development of biodegradability indicators for microwave sludge conditioning

Beszédes¹,

Veszelovszki²,

Ludányi³

et al. 2015

HAE

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Microwave irradiation has a good potential to increase the ability of organic matter for biological degradation. Because of the strong disintegration effect of microwave irradiation on extracellular polymeric substances (EPS), which form complex sludge structure, and also on microbial cell walls has led to enhanced solubility of organic matters, given by the ratio of soluble to total chemical oxygen demand (SCOD/TCOD). From the aspect of the further utilization of sludge, the change of biochemical oxygen demand (BOD), which correlates the degradable organic matters of sludge under aerobic condition, can be considered advantageous. For comparison purpose, and for modeling and optimization of process, it is needed to create novel control parameters, by which can be measured the changes in organic matter fraction of sludge independently from the varying characteristic or different origin of raw sludge. Based on our results, it has established that in the range of 90-1050 kJkg -1 , and 0.5-5 Wg -1 for IMWE and MWPL, the surface fitted by constructed model can be characterized by a maximum value for BDI. Microwave treatment carried out over a certain value of MWPL and IMWE has resulted in lower biodegradability. Optimum range of IMWE and MWPL was concluded as 600-650 kJ and 2.5-3.0 Wg -1 , respectively, and both process parameters have significant effect on the change of BDI and SLI, as well.

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Energy efficiency of pre-treating excess sewage sludge with microwave irradiation

Cited by 104 publications

References 28 publications

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

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

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

Development of biodegradability indicators for microwave sludge conditioning

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