Mesophilic anaerobic co-digestion of poultry dropping and  Carica papaya  peels: Modelling and process parameter optimization study

Dahunsi, S. O.; Oranusi, S. U.; Owolabi, Joshua B.; Efeovbokhan, Vincent Enon

doi:10.1016/j.biortech.2016.05.118

Cited by 78 publications

(61 citation statements)

References 29 publications

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“…The aim of this research therefore was to evaluate the biogas producing potentials of pawpaw fruit peels via anaerobic digestion and using combination of different pretreatment methods. Though, biogas generation from the co-digestion of pawpaw fruit peels and poultry dropping has been documented (Dahunsi et al, 2016a), this is the very first reported attempt to use pawpaw fruit peels for bioenergy generation in mono-digestion. Since standardization of bioprocess parameters is an important step in biofuel/biochemical production procedure (Betiku and Ajala, 2014), the optimization of the process parameters was also carried out to establish a benchmark for pawpaw peel's usage as a bioenergy substrate.…”

Section: Introductionmentioning

confidence: 94%

“…Validation of the RSM model was carried out using same digesters and the predicted values after which the plots of the deviations of actual and observed values were constructed. ANNs was equally used to statistically analyze the data obtained from the CCD as earlier reported (Dahunsi et al, 2016a). The mean square error (MSE) approach was used to determine the optimum ANN structure and the higher coefficient of determination (R 2 ) were determined.…”

Section: Statistical Data Analysismentioning

confidence: 99%

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Cleaner energy for cleaner production: Modeling and optimization of biogas generation from Carica papayas (Pawpaw) fruit peels

Dahunsi

Oranusi

Efeovbokhan

2017

Journal of Cleaner Production

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In this study, the potentials of pretreated and untreated Carica papayas fruit peels for biogas generation was evaluated alongside its process optimization after employing the combination of mechanical and thermo-alkaline pretreatment methods. The peel was anaerobically digested using a consortium of microorganisms from cattle rumen content as inoculum. A batch system designed by the Central Composite Design (CCD) was employed. The physicochemical and microbial characteristics of the substrates and inoculum as well as the constituent of the generated biogas were evaluated using standard methods and results showed elevated levels of most elements after anaerobic digestion. The most feasible experimental biogas yields were 0.1839 m 3 /kg VS and 0.1361 m 3 /kg VS for the pretreated and untreated experiments respectively. Microbiologically, members of the genus Clostridium dominated the microbial flora and their succession patterns were affected by temperature and pH. The methane and carbon dioxide content of biogas from both experiments were 61.5± 2.5%; 24± 1% and 52 ± 2%; 25± 1.5% respectively. The Response Surface Methodology (RSM) and the Artificial Neural Networks (ANNs) were employed in data optimization. Based on the optimized values, the predicted biogas yield for RSM was 0.1895 m 3 /kg VS and 0.1839 m 3 /kg VS for ANNs in the pretreated experiment. For the experiment without pretreatment, the RSM predicted yield was 0.1361 m 3 /kg VS while that of ANNs was 0.1392 m 3 / kg VS. In all, there was a 26.5% increase in predicted biogas yield in the pretreated experiment over the untreated. Further usage of pawpaw peels for biofuels generation is advocated.

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Section: Introductionmentioning

confidence: 94%

Section: Statistical Data Analysismentioning

confidence: 99%

Cleaner energy for cleaner production: Modeling and optimization of biogas generation from Carica papayas (Pawpaw) fruit peels

Dahunsi

Oranusi

Efeovbokhan

2017

Journal of Cleaner Production

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“…Alkaline pretreatment of biomass is not new in the energy literature. Alkalis such as NaOH, KOH and others have been extensively used in treating different biomass [16,17]. Few of the previous researches with pretreatment of biomass are hydrogenolysis of cellulose into methane [21], kitchen wastes [26], food waste [27], Tithonia diversifolia shoot [9], Chromolaena ododrata shoot [5], Arachis hypogeae hull [10], Telfairia occidentalis fruit peel [6], Carica papaya fruit peel [8].…”

Section: Introductionmentioning

confidence: 99%

Liquefaction of pineapple peel: Pretreatment and process optimization

Dahunsi

2019

Energy

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a b s t r a c tThis study explored the optimization of pretreatment of pineapple peel for biogas generation. Pretreatments were carried out sulfuric acid and alkaline hydrogen peroxide prior to anaerobic digestion while the response surface methodology (RSM) was used for optimization of the pretreatment procedures. The physical, chemical, proximate and structural compositions of the peels were determined prior to and at the end of the pretreatment procedures. The dynamics of microorganisms in the reactors were also evaluated by rapid molecular methods while the Fourier Transform Infra-red (FTIR) spectroscopy was employed in the identification of the chemical changes as a result of pretreatments. The use of H 2 O 2 pretreatment caused enormous lignin solubilization in the pineapple peel. In comparison, biogas production was 67% more in the alkaline pretreated pineapple peel than the biomass treated with acid and also 51% over the untreated samples. The total biogas volume produced from the acidic pretreated, alkaline pretreated, not sifted untreated and sifted untreated samples are 194.2 ± 3.0, 587.5 ± 5.2, 287.8 ± 2.1 and 245.4 ± 3.1 respectively. Thus, the alkaline pretreated experiment used lower retention time to achieve maximum gas production in this study. The use of alkaline H 2 O 2 on lignocelluloses has remained unpopular prior to this study. However, its usage in this study yielded better result than all the conventional treatments in terms of lignin solubilization and improvement in methane yield. Economically, the use of H 2 O 2 for pretreatment is adjudged feasible because the 1504 kWh t À1 TS thermal energy gain obtained from the biogas produced by the alkaline treated peel exceeded the 921 kWh t À1 TS used in the pretreatment. This gives a net thermal energy of 583 kWh t À1 TS. Whereas, the investment into acidic pretreatment of pineapple peel may not be economically justified because the total thermal energy gain of À200 kWh t À1 TS was far lower than the 1236 kWh t À1 TS thermal energy that was consumed during the pretreatment giving a net thermal energy of À1436 kWh t À1 TS. Therefore, the use of mild alkaline pretreatment is advocated in biogas generation from pineapple peel and also for biofertilizer production mostly in localities of mass production.

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“…Fresh cattle manure contains microbial flora and therefore AD starts faster when using such feedstocks . The use of microbial consortia for AD is well documented . Therefore, cattle manure was used as an inoculum, where the substrate/inoculum ratio was determined as 10/1 in all reactors.…”

Section: Methodsmentioning

confidence: 99%

Identification of new critical points for logistics model in cumulative methane yield curves after co‐digestion of apple pulp and chicken manure with sulphuric acid pretreatment and a new modelling study

Şenol

2020

Int J Energy Res

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In this study, anaerobic co-digestion of apple pulp (AP) with high carbon content and chicken manure (CM) with high nitrogen content was evaluated with regard to sulphuric acid pretreatment conditions in the concentration range of 1%-6% v/v. The best mixing ratio of CM:AP was determined as 3:1 w/w under untreated conditions for which the methane yield was 255.88 ± 11.55 mL/g VS (volatile solid). Sulphuric acid pretreatments were applied to this mixture ratio.The highest methane yield after pretreatment was 466.01 ± 10.85 mL/g VS in the reactor, where the sulphuric acid pretreatment concentration was 3.0% v/v. Control of acid pretreatment results were achieved by analysis of lignocellulosic degradation and increase in soluble chemical oxygen demand. The highest cellulose, hemicellulose and lignin degradation after pretreatment were 27.5% ± 1.4%, 35.9% ± 2.9% and 14% ± 1.5% w/w, respectively. The cumulative methane yields (CMY) were analysed by the modified logistic model, modified Bertalanffy model (MBM), modified Gompertz model (MGM) and modified Holling model (MHM). The MBM and MGM were found to fit the experimental data better than other models. The MHM has not previously been applied to CMY. In addition to the kinetic studies, new critical points for CMYs were identified in the logistics model (lm). The importance and critical properties of these points with regard to CMY are introduced. The differences and superior properties of these critical points compared to other modelling methods are discussed. K E Y W O R D S apple pulp, chicken manure, logistic model, methane yield, new critical points, sulphuric acid pretreatment

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Mesophilic anaerobic co-digestion of poultry dropping and Carica papaya peels: Modelling and process parameter optimization study

Cited by 78 publications

References 29 publications

Cleaner energy for cleaner production: Modeling and optimization of biogas generation from Carica papayas (Pawpaw) fruit peels

Cleaner energy for cleaner production: Modeling and optimization of biogas generation from Carica papayas (Pawpaw) fruit peels

Liquefaction of pineapple peel: Pretreatment and process optimization

Identification of new critical points for logistics model in cumulative methane yield curves after co‐digestion of apple pulp and chicken manure with sulphuric acid pretreatment and a new modelling study

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