Effect of output power, target temperature, and solid concentration on the solubilization of waste activated sludge using microwave irradiation

Park, Woon-Ji; Ahn, Ji Hyeon; Hwang, Seokhwan; Lee, Chan-Ki

doi:10.1016/j.biortech.2009.02.062

Cited by 86 publications

(35 citation statements)

References 17 publications

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“…The coefficientˇ1 for SCOD/TCOD was −0.045, it indicated that low sludge concentration was better than high sludge concentration for improvement of SCOD/TCOD ratio under mild temperature. 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].…”

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

confidence: 93%

“…Several previous studies have considered model simulation of MW sludge pretreatment [15,21,22,38,39]. For example, Yang et al [38] constructed a quadratic model to investigate the effects of combined alkaline and microwave pretreatment with two variables (different pH and specific energy input by RSM.…”

Section: Quadratic Models For All Response Variablesmentioning

confidence: 99%

“…Pretreated sludge has been demonstrated to be suitable for many purposes, including the following: (1) enhancing anaerobic (or non-thermal) effects [17]. For the solubilization of waste activated sludge, the effectiveness of microwave irradiation is affected by several factors, which have been investigated extensively [3]; such factors include MW output power [10,18], target temperature [19], and sludge concentrations [20,21]. However, investigation of these factors through conventional "change one factor at a time" methods have some shortcomings, including that these methods are laborious, time-consuming, and incapable of obtaining true optimal values owing to their inability to consider interactions among variables.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, three-factor fixed-effect analysis of variance (ANOVA) determination has been adopted to evaluate the effects of high temperature (110-175 • C), MW intensity (1.25 and 3.75 • C/min), and sludge concentration (6 and 11.85%) on the solubilization of sludge [22]; the interaction of these factors was found to be significant at the 94% confidence interval. Moreover, the effects of heating pretreatment on the degree of solubilization of waste activated sludge are investigated using response surface analysis [21], and the conditions required to produce a maximum solubilization degree of 17.9% were predicted to be 400 W (output power 400-1600 W), 102 • C (target temperature 60-120 • C), and 2.3% TS (total solid concentration, 1-3%).…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

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: Quadratic Models For All Response Variablesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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-induced organic synthesis has proven to be very efficient in promoting the dehydration of biomass to furans by greatly reducing the reaction time and resulting in high selectivity and yield (Park et al, 2010;Zhang and Zhao, 2010). A high input of energy via the microwave irradiation allows the reaction to overcome the energy barrier for product formation much faster than by conventional heating and therefore speeds up the reaction significantly.…”

Section: Introductionmentioning

confidence: 99%

Production of 5-hydroxymethylfurfural from glucose catalyzed by hydroxyapatite supported chromium chloride

Zhang

Zhao

2011

Bioresource Technology

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Various Sludge Pretreatments: Their Impact on Biogas Generation

Banu

Kavitha

2017

Waste Biomass Management – A Holistic Approach

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Biogas produced through anaerobic degradation of waste activated sludge (WAS) in wastewater treatment plants has gained much more attention as it is a renewable energy resource. An apparent advantage of anaerobic digestion is the generation of biogas that presents a renewable substitute for utilization of fossil fuels. It was observed that pretreatment has to be done prior to anaerobic degradation (AD) to enhance the biogas generation. This review deals with various pretreatments-chemical, physical, mechanical, combinative, phase-separated pretreatment, their mode of action, advantages and their impact on biogas generation. An extensive review of these pretreatment techniques could plausibly aid in increasing the biogas production and thus rises the sustainable energy generation.

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Effect of output power, target temperature, and solid concentration on the solubilization of waste activated sludge using microwave irradiation

Cited by 86 publications

References 17 publications

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

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

Production of 5-hydroxymethylfurfural from glucose catalyzed by hydroxyapatite supported chromium chloride

Various Sludge Pretreatments: Their Impact on Biogas Generation

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