Athermal microwave effects for enhancing digestibility of waste activated sludge

Eskicioğlu, Çiğdem; Terzian, Nicolas; Kennedy, Kevin J.; Droste, Ronald L.; Hamoda, Mohamed F.

doi:10.1016/j.watres.2007.03.008

Cited by 250 publications

(128 citation statements)

References 36 publications

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“…For this reason a considerable difference was experienced in the efficiency of aerobic degradation (biodegradability) and anaerobic degradation (methane product). The positive effect of common microwave and ozone pretreatments could be explained by changing of the soluble organic matter content, because the aerobic biodegradability and anaerobic digestible were linked to it (Bougrier et al, 2007;Eskicioglu et al, 2007). In consequence of high quantity but recalcitrant organic matter content of canned maize production sludge the increasing of biodegradable organic substances enhanced the biogas production on a large scale.…”

Section: Controlmentioning

confidence: 99%

“…For example the thermal effect of microwave radiation is caused by polarized parts of macromolecules, it results in breakage of hydrogen bound (Eskicioglu et al, 2007). The intensive microwave heat generation and the different dielectric properties of compounds of the cell wall lead to a rapid disruption of extracellular polymer network and residue cells of sludge.…”

Section: Introductionmentioning

confidence: 99%

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Biogas Production of Ozone and/or Microwave-Pretreated Canned Maize Production Sludge

Beszédes

Kertész

László

et al. 2009

Ozone: Science & Engineering

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The production of canned maize is accompanied by formation of large volumes of waste water, with high contents of starch, and high chemical-and biochemical oxygen demand. In our work the effects of acidic, microwave and ozone pretreatment on the biogas production and aerobic biodegradability of canned maize production sludge were examined and the energy balance of the processes were determined when different sludge pretreatments were used. It was found that ozone treatment decreased the chemical oxygen demand, while the biochemical oxygen demand and the aerobic biodegradability increased. The combination of microwave and ozone treatment increased the biodegradability relative to ozone treatment alone.

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Section: Controlmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Biogas Production of Ozone and/or Microwave-Pretreated Canned Maize Production Sludge

Beszédes

Kertész

László

et al. 2009

Ozone: Science & Engineering

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show abstract

“…However, the application of anaerobic digestion is often limited by the slow hydrolysis rate and/or poor biochemical methane potential (or degradation extent) of the WAS [7][8][9][10][11] . In order to effectively enhance methane production from WAS in anaerobic digestion, a number of strategies have been developed, such as thermal, chemical, and mechanical methods [12][13][14][15][16][17][18][19][20][21] . However, most of these methods are cost intensive owing to high energy input or large chemical requirements 7,22,23 .…”

mentioning

confidence: 99%

Zero Valent Iron Significantly Enhances Methane Production from Waste Activated Sludge by Improving Biochemical Methane Potential Rather Than Hydrolysis Rate

Liu¹,

Wang²,

Zhang³

et al. 2016

Environmental Engineering and Activated Sludge Processes

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Anaerobic digestion has been widely applied for waste activated sludge (WAS) treatment. However, methane production from anaerobic digestion of WAS is usually limited by the slow hydrolysis rate and/or poor biochemical methane potential of WAS. This work systematically studied the effects of three different types of zero valent iron (i.e., iron powder, clean scrap and rusty scrap) on methane production from WAS in anaerobic digestion, by using both experimental and mathematical approaches. The results demonstrated that both the clean and the rusty iron scrap were more effective than the iron powder for improving methane production from WAS. Model-based analysis showed that ZVI addition significantly enhanced methane production from WAS through improving the biochemical methane potential of WAS rather than its hydrolysis rate. Economic analysis indicated that the ZVI-based technology for enhancing methane production from WAS is economically attractive, particularly considering that iron scrap can be freely acquired from industrial waste. Based on these results, the ZVI-based anaerobic digestion process of this work could be easily integrated with the conventional chemical phosphorus removal process in wastewater treatment plant to form a cost-effective and environment-friendly approach, enabling maximum resource recovery/reuse while achieving enhanced methane production in wastewater treatment system. L arge amounts of organic matter from wastewater are converted into waste activated sludge (WAS) during biological treatment processes in wastewater treatment plants (WWTPs)1 . Anaerobic digestion of WAS has been widely applied to stabilize and reduce the volume of WAS as well as produce a renewable bioenergy resource in the form of methane 2-5 . The anaerobic digestion process generally consists four stages, i.e. hydrolysis, fermentation, acetogenesis and methanogenesis for methane production 6 . However, the application of anaerobic digestion is often limited by the slow hydrolysis rate and/or poor biochemical methane potential (or degradation extent) of the WAS 7-11 . In order to effectively enhance methane production from WAS in anaerobic digestion, a number of strategies have been developed, such as thermal, chemical, and mechanical methods [12][13][14][15][16][17][18][19][20][21] . However, most of these methods are cost intensive owing to high energy input or large chemical requirements 7,22,23 . Thus, alternative cost-effective approach to improve methane production from WAS in anaerobic digestion process is highly desired.Zero valent iron (ZVI), a cheap reducing agent, has been widely used in wastewater pretreatment, groundwater purification and soil remediation 24,25 . Recent studies have found that ZVI addition in anaerobic reactors for biological wastewater treatment could significantly improve chemical oxygen demand (COD) removal by ca. 25% [26][27][28][29] . Indeed ZVI can lower oxidation-reduction potential and serve as an acid buffer, thus helping maintain a stable and favourable condition for methan...

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“…To overcome these obstacles, sludge pretreatment technologies have been developed incrementally in several previous studies [1,2]. 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].…”

Section: Introductionmentioning

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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Athermal microwave effects for enhancing digestibility of waste activated sludge

Cited by 250 publications

References 36 publications

Biogas Production of Ozone and/or Microwave-Pretreated Canned Maize Production Sludge

Biogas Production of Ozone and/or Microwave-Pretreated Canned Maize Production Sludge

Zero Valent Iron Significantly Enhances Methane Production from Waste Activated Sludge by Improving Biochemical Methane Potential Rather Than Hydrolysis Rate

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

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