Synergetic pretreatment of sewage sludge by microwave irradiation in presence of H2O2 for enhanced anaerobic digestion

Eskicioğlu, Çiğdem; Prorot, Audrey; Marín, Juan; Droste, Ronald L.; Kennedy, Kevin J.

doi:10.1016/j.watres.2008.08.010

Cited by 189 publications

(86 citation statements)

References 29 publications

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“…The SCOD increased with an increase of microwave temperature to a higher range of 80 to 90 °C. This was due to the fact that heating would also increase the decomposition of H 2 O 2 into hydroxyl radicals and therefore enhance the oxidation process when H 2 O 2 was applied simultaneously with microwave heating (Eskicioglu, et al, 2008).…”

Section: Continuous Operationmentioning

confidence: 99%

Microwave Enhanced Advanced Oxidation Process Application to Treatment of Dairy Manure

Lo¹

2011

Microwave Heating

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Section: Continuous Operationmentioning

confidence: 99%

Microwave Enhanced Advanced Oxidation Process Application to Treatment of Dairy Manure

Lo¹

2011

Microwave Heating

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“…Therefore, an effective way of releasing more OH· and O 2 − · through H 2 O 2 decomposition would be to adjust the pH value to alkaline condition and heat the sludge to 80°C, thereby improving the utilization efficiency and oxidative effect of H 2 O 2 during sludge pretreatment by the MW-H 2 O 2 advanced oxidation process. Thirdly, in previous studies (Wang, 2009;Wang et al, 2009a;Yan, 2010;Eskicioglu et al, 2008;Doǧan and Sanin, 2009;Chang et al, 2011), a synergistic effect occurred in sludge pretreated by a combination of microwave irradiation and alkaline conditions that promoted sludge disintegration. In this study, the pH value was firstly adjusted to 11.0 before sludge pretreatment by the MW-H 2 O 2 advanced oxidation process, and this enhanced the effects of oxidation and disintegration of the sludge caused by H 2 O 2 and/or OH·.…”

Section: Discussionmentioning

confidence: 90%

“…For the same pH value, concentrations of TOC, NH 4 + -N, PO 4 3− -P, TN, and TP released were increased with the increase of H 2 O 2 :MLSS ratio. It was reported that microwave heating would increase the decomposition of H 2 O 2 into hydroxyl radicals and therefore enhance the oxidation process when H 2 O 2 was applied simultaneously with either conventional or microwave heating (Yu et al, 2010a(Yu et al, , 2010bEskicioglu et al, 2008). Additionally, Yu et al (2010aYu et al ( , 2010b found that release of organic matters was firstly increased with the increase of H 2 O 2 dosage at the same temperature, and then decreased as further increase of H 2 O 2 dosage.…”

Section: Discussionmentioning

confidence: 97%

“…Therefore, with optimization, not only was the H 2 O 2 dosage sharply reduced by 80% (H 2 O 2 :MLSS ratio reduced from 1.0 to 0.2), but also the release rate of SCOD was nearly the same as that without optimization (at a H 2 O 2 :MLSS ratio of 0.5). In addition, the sludge disintegration performance of this optimized MW-H 2 O 2 process based on the released SCOD rate (29.5%) was higher than that (28%) of sludge pretreated in the MW-H 2 O 2 process (at 120°C, 1 g H 2 O 2 /g MLSS) (Eskicioglu et al, 2008 …”

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confidence: 84%

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Optimization of H2O2 dosage in microwave-H2O2 process for sludge pretreatment with uniform design method

Xiao

Yan

Wei

et al. 2012

Journal of Environmental Sciences

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A microwave-H 2 O 2 process for sludge pretreatment exhibited high efficiencies of releasing organics, nitrogen, and phosphorus, but large quantities of H 2 O 2 residues were detected. A uniform design method was thus employed in this study to further optimize H 2 O 2 dosage by investigating effects of pH and H 2 O 2 dosage on the amount of H 2 O 2 residue and releases of organics, nitrogen, and phosphorus. A regression model was established with pH and H 2 O 2 dosage as the independent variables, and H 2 O 2 residue and releases of organics, nitrogen, and phosphorus as the dependent variables. In the optimized microwave-H 2 O 2 process, the pH value of the sludge was firstly adjusted to 11.0, then the sludge was heated to 80°C and H 2 O 2 was dosed at a H 2 O 2 :mixed liquor suspended solids (MLSS) ratio of 0.2, and the sludge was finally heated to 100°C by microwave irradiation. Compared to the microwave-H 2 O 2 process without optimization, the H 2 O 2 dosage and the utilization rate of H 2 O 2 in the optimized microwave-H 2 O 2 process were reduced by 80% and greatly improved by 3.87 times, respectively, when the H 2 O 2 :MLSS dosage ratio was decreased from 1.0 to 0.2, resulting in nearly the same release rate of soluble chemical oxygen demand in the microwave-H 2 O 2 process without optimization at H 2 O 2 :MLSS ratio of 0.5.

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“…Thus, the final pH of slurry may remain within the natural range, which will be beneficial for subsequent treatment of sludge. In the group without pH control, weak acidic products (e.g., VFA) [49] generated by MW-H 2 O 2 treatment may disturb the further post treatment of sludge. Nevertheless, the mechanisms by which pH affects the microwave-H 2 O 2 sludge pretreatment process require further research.…”

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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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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Synergetic pretreatment of sewage sludge by microwave irradiation in presence of H2O2 for enhanced anaerobic digestion

Cited by 189 publications

References 29 publications

Microwave Enhanced Advanced Oxidation Process Application to Treatment of Dairy Manure

Microwave Enhanced Advanced Oxidation Process Application to Treatment of Dairy Manure

Optimization of H2O2 dosage in microwave-H2O2 process for sludge pretreatment with uniform design method

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

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