Experimental design of mixture for the anaerobic co-digestion of sewage sludge

Rao, P. Venkateswara; Baral, Saroj Sundar

doi:10.1016/j.cej.2011.07.010

Cited by 94 publications

(53 citation statements)

References 32 publications

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“…In general, cattle manure biodegrades more slowly than other organic waste because of hay materials. The addition of co-digestion feedstocks can improve the biodegradability and the VS in the anaerobic reactor by including the co-digestion of cattle waste and the addition of food waste, fruit or vegetable waste, industrial organic waste or sewage sludge (Callaghan et al 1998;Naik et al 2010;Rao and Baral 2011;Zhang et al 2013). The physical and chemical characteristics of the feedstocks have significant effect on the overall anaerobic phase for designing and operating anaerobic reactors because they affect biogas generation and digestion stability during anaerobic process.…”

Section: Feedstocks For Anaerobic Digestionmentioning

confidence: 99%

“…Over the last years, several authors investigated the effect on the performance of the AD process by simultaneously treating cattle manure as well as wastes containing high levels of organic matter or energy crops (Alvarez and Liden 2008;Comino et al 2009;Lehtomaki et al 2007;Nasir et al 2012;Yangin-Gomec and Ozturk 2013). This co-digestion method, if co-substrate is used at the appropriate rate, can give interesting results because the synergistic impact indicated by different organic substrates when processed simultaneously (Angelidaki and Ellegaard 2003;Chen et al 2010;Dias et al 2014;El-Mashad et al 2004;Hills and Roberts 1981;Lehtomaki et al 2007;Li et al 2009Li et al , 2011Macias-Corral et al 2008;Mata-Alvarez et al 2000;Rao and Baral 2011;Umetsu et al 2006). For optimal carbon-to-nitrogen ratio and pH diverse substrates are mixed for best biogas production (Khan and Martin 2016).…”

Section: Introductionmentioning

confidence: 99%

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Effects of co-substrate on biogas production from cattle manure: a review

Tufaner

Avşar

2016

Int. J. Environ. Sci. Technol.

105

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This literature review surveys the previous and current researches on the co-digestion of anaerobic processes and examines the synergies effect of co-digestion with cattle manure. Furthermore, this review also pays attention to different operational conditions like operating temperature, organic loading rate (OLR), hydraulic retention time (HRT), chemical oxygen demand (COD) and volatile solid (VS) removal efficiency and biogas or methane production. This review shows that anaerobic mono-digestion of cattle manure usually causing poor performance and stability. Anaerobic studies were generally performed under mesophilic conditions maintained between 35 and 37°C. Organic waste loading rate generally ranges from 1 to 6 g VS-COD L -1 day -1 stable condition in anaerobic digester. Generally, studies show that HRT for co-digestion of fruit-vegetables waste and industrial organic waste appears to exceed 20 days. However, the anaerobic co-digestion process is generally operated at HRT of between 10 and 20 days. VS and COD removal efficiency usually reaches up to 90 % due to codigestion with different type organic waste. Methane-biogas production is generally obtained between 0.1 and 0.65 L CH 4 -biogas g -1 VS.

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Section: Feedstocks For Anaerobic Digestionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effects of co-substrate on biogas production from cattle manure: a review

Tufaner

Avşar

2016

Int. J. Environ. Sci. Technol.

105

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“…Two recent studies were found applying an experimental design for evaluating the mixture ratios for co-digestion processes [19] [20]. Rao and Baral [19] investigated the co-digestion of sewage sludge with cow dung and garden wastes, or with cow dung and fruit juice wastewater, while Wang et al [20] performed co-digestion of a mixture of animal manures (dairy, chicken and swine) with rice straw.…”

Section: Introductionmentioning

confidence: 99%

“…Rao and Baral [19] investigated the co-digestion of sewage sludge with cow dung and garden wastes, or with cow dung and fruit juice wastewater, while Wang et al [20] performed co-digestion of a mixture of animal manures (dairy, chicken and swine) with rice straw. In these studies at maximum of three components were asses in the batch assays and no deeper explanation was undertaken to fully understand the synergistic effects in mixed substrates.…”

Section: Introductionmentioning

confidence: 99%

Anaerobic co-digestion of solid slaughterhouse wastes with agro-residues: Synergistic and antagonistic interactions determined in batch digestion assays

Pagés‐Díaz

Reyes

Taherzadeh

et al. 2014

Chemical Engineering Journal

142

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Please cite this article as: J.P. Díaz, I.P. Reyes, M.J. Taherzadeh, I.S. Horváth, M. Lundin, Anaerobic co-digestion of solid slaughterhouse wastes with agro-residues: Synergistic and antagonistic interactions determined in batch digestion assays, Chemical Engineering Journal (2014), doi: http://dx.doi.org/10. 1016/j.cej.2014.02.008 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. AbstractDifferent mixture ratios of solid cattle slaughterhouse wastes (SB), manure (M), various crops (VC), and municipal solid wastes (MSW) were investigated for biogas production. The objective was to explore possible significant synergistic effects obtained from the combination of these different substrates. The performance of the process was assessed in thermophilic anaerobic batch co-digestion assays, using a four factor mixture design and methane yield (Y CH4 ) and specific methane production rate (r sCH4 ) as response variables.The highest methane yield, 655 NmL CH 4 /g VS was obtained when equal parts (ww) of SB, M, VC, and MSW were combined, while the combination of SB, M, and MSW resulted in the highest specific methane production rate (43 NmL CH 4 /g VS/d). A mixture design model was fitted to data in order to appraise synergistic and antagonistic interactions. Mixing all four substrates resulted in a 31% increase of the expected yield which was calculated from the methane potential of the individual fractions, clearly demonstrating a synergistic effect due to more balanced nutrient composition enhancing the anaerobic digestion process. However, no significant antagonistic effects were observed. In order to maximize both response variables simultaneously, a response surface method was employed to establish the optimal combination of substrate mixtures. The statistical results and analysis of the biological process gave a coherent picture of the results.

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“…Statistical mixture designs are special class of response surface designs where the proportions of the components or factors are considered important. It involves the use of different combinations between the components for changing mixture composition and exploring how such changes will affect a specific response (Rao and Baral 2011;De Castro and Sato 2013).…”

Section: Introductionmentioning

confidence: 99%

Synergistic effect of Aspergillus tubingensis CTM 507 glucose oxidase in presence of ascorbic acid and alpha amylase on dough properties, baking quality and shelf life of bread

et al. 2015

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The impact of Aspergillus tubingensis glucose oxidase (GOD) in combination with α-amylase and ascorbic acid on dough properties, qualities and shelf life of bread was investigated. Regression models of alveograph and texture parameters of dough and bread were adjusted. Indeed, the mixture of GOD (44 %) and ascorbic acid (56 %) on flour containing basal improver showed its potential as a corrective action to get better functional and rheological properties of dough and bread texture. Furthermore, wheat flour containing basal additives and enriched with GOD (63.8 %), ascorbic acid (32 %) and α-amylase (4.2 %) led to high technological bread making parameters, to decrease the crumb firmness and chewiness and to improve elasticity, adhesion, cohesion and specific volume of bread. In addition to that, the optimized formulation addition significantly reduced water activity and therefore decreased bread susceptibility to microbial spoilage. These findings demonstrated that GOD could partially substitute not only ascorbic acid but also α-amylase. The generated models allowed to predict the behavior of wheat flour containing additives in the range of values tested and to define the additives formula that led to desired rheological and baking qualities of dough. This fact provides new perspectives to compensate flour quality deficiencies at the moment of selecting raw materials and technological parameters reducing the production costs and facilitating gluten free products development.

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Experimental design of mixture for the anaerobic co-digestion of sewage sludge

Cited by 94 publications

References 32 publications

Effects of co-substrate on biogas production from cattle manure: a review

Effects of co-substrate on biogas production from cattle manure: a review

Anaerobic co-digestion of solid slaughterhouse wastes with agro-residues: Synergistic and antagonistic interactions determined in batch digestion assays

Synergistic effect of Aspergillus tubingensis CTM 507 glucose oxidase in presence of ascorbic acid and alpha amylase on dough properties, baking quality and shelf life of bread

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