Improvement of methane production from P. canaliculata through mechanical pretreatment

Rodríguez, Cristina; Alaswad, Abed; El-Hassan, Zaki; Olabi, Abdul–Ghani

doi:10.1016/j.renene.2017.12.025

Cited by 41 publications

(22 citation statements)

References 20 publications

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“…However, since mechanical size reduction is costly, the viability of integrating a pretreatment step will need to be assessed on a case by case basis. Similar work on pretreatment was conducted by Rodriguez et al [52] on freshly harvested seaweed Pelvetia canaliculata in a multi-objective optimization using a response surface methodology with a composite central design. Inoculum-to-substrate (ISR) ratio was varied in addition to pretreatment time, where digested sludge was used for seeding.…”

Section: Effect Of Inoculum Acclimatation On Methane Productionmentioning

confidence: 87%

Optimisation of biogas generation from brown seaweed residues: Compositional and geographical parameters affecting the viability of a biorefinery concept

Tedesco

Daniels

2018

Applied Energy

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Very recently, integrated biorefinery approaches are being developed with the aim to produce high-value products for a variety of industries in conjunction with green energy from sustainable biomass. Macroalgae (seaweed) have been regarded as more sustainable compared to terrestrial crops, since they do not occupy land for growth. Macroalgal biomass changes greatly according to species and harvest season, which affects its chemical energy potential. This study was conducted seasonally on five species of brown seaweed over a yearlong period to investigate the effects of chemical composition variations, bioproducts extraction processes and inoculum acclimatation on methane production. As a result of the bioproducts extraction, it was found the seaweed residues exhibit a great potential to produce methane. Stoichiometric methane yield and C:N ratio changed in favour of an improved digestibility with bioconversion rates greater than 70% in some instances, i.e. achieved by Laminaria species and on the West coast Fucus serratus. The two Laminaria species investigated also presented the highest CH4 production rate, with Laminaria digitata reaching 523 mL CH4 gVS-1 and L. saccharina peaking at 535 mL CH4 gVS-1 with acclimatised and non-acclimatised sludge respectively.

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Section: Effect Of Inoculum Acclimatation On Methane Productionmentioning

confidence: 87%

Optimisation of biogas generation from brown seaweed residues: Compositional and geographical parameters affecting the viability of a biorefinery concept

Tedesco

Daniels

2018

Applied Energy

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“…The pH and temperature were measured using test probes. The TS, VS, total Kjeldahl nitrogen (TKN), and NH 3 -N were measured using the standard method for the examination of water and wastewater [29]. For the assessment of VFA and soluble COD (sCOD), the samples were first filtered using a 0.45 µm cellulose nitrate filter paper before subsequent testing using the esterification method (HACH, Method 8196, DR 6000 spectrophotometer) and acid persulfate digestion method (HACH, Method 8190, Test & Tube Vials).…”

Section: Methodsmentioning

confidence: 99%

Performance and Kinetic Model of a Single-Stage Anaerobic Digestion System Operated at Different Successive Operating Stages for the Treatment of Food Waste

et al. 2019

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A large quantity of food waste (FW) is generated annually across the world and results in environmental pollution and degradation. This study investigated the performance of a 160 L anaerobic biofilm single-stage reactor in treating FW. The reactor was operated at different hydraulic retention times (HRTs) of 124, 62, and 35 days under mesophilic conditions. The maximum biogas and methane yield achieved was 0.934 L/g VSadded and 0.607 L CH4/g VSadded, respectively, at an HRT of 124 days. When HRT decreased to 62 days, the volatile fatty acid (VFA) and ammonia accumulation increased rapidly whereas pH, methane yield, and biogas yield decreased continuously. The decline in biogas production was likely due to shock loading, which resulted in scum accumulation in the reactor. A negative correlation between biogas yield and volatile solid (VS) removal efficiency was also observed, owing to the floating scum carrying and urging the sludge toward the upper portion of the reactor. The highest VS (79%) and chemical oxygen demand (COD) removal efficiency (80%) were achieved at an HRT of 35 days. Three kinetic models—the first-order kinetic model, the modified Gompertz model, and the logistic function model—were used to fit the cumulative biogas production experimental data. The kinetic study showed that the modified Gompertz model had the best fit with the experimental data out of the three models. This study demonstrates that the stability and performance of the anaerobic digestion (AD) process, namely biogas production rate, methane yield, intermediate metabolism, and removal efficiency, were significantly affected by HRTs.

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“…In this paper, a design of experiment will be adopted to analyze the effect of input responses, as well as to test the efficiency of each of the input responses to the output response (% of lipid produced), where % of lipid produced is the amount of lipid extracted divided by the dry weight of alga biomass in each 500-mL flask used for each pre-treatment. Design of experiment application has been extensively used in most of engineering data solving techniques [71]. This method (DOE) has been used to determine experimental design order, performing statistical analysis, and showcase a graphical representation of the effects on input parameters to output responses.…”

Section: Experimental Designmentioning

confidence: 99%

Optimization of Pre-Treatment Process Parameters to Generate Biodiesel from Microalga

et al. 2018

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Cell disruption is an integral part of microalga production process, which improves the release of intracellular products that are essential for biofuel production. In this work, pre-treatment parameters that will enhance the efficiency of lipid production using high-pressure homogenizer on microalgae biomass will be investigated. The high-pressure homogenizer that is considered is a GYB40-10S/GY60-6S; with a pre-treatment pressure of 1000 psi, 2000 psi, and 3000 psi, the number of passes; 1, 2, and 3, a reaction time of 3, 3.5, and 4 h. Pressure and cavitation increase the efficiency of the pre-treatment process of the homogenizer. In addition, homogenization shear force and pressure are the basic significant factors that enhance the efficiency of microalgae cell rupture. Also, the use of modelling to simulate pre-treatment processes (Response Surface Methodology (RSM), Box-Behnken Designs (BBD), and design of experiment (DOE) for process optimization will be adopted in this study. The results clearly demonstrate that high-pressure homogenization pre-treatment can effectively disrupt microalga cell walls to enhance lipid recovery efficiency, with a relatively short extraction time, both that are essential for maintaining a good quality of lipids for biofuel production. A maximum of 18% lipid yields were obtained after 3 h of HPH pre-treatment at 3000 psi.

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Improvement of methane production from P. canaliculata through mechanical pretreatment

Cited by 41 publications

References 20 publications

Optimisation of biogas generation from brown seaweed residues: Compositional and geographical parameters affecting the viability of a biorefinery concept

Optimisation of biogas generation from brown seaweed residues: Compositional and geographical parameters affecting the viability of a biorefinery concept

Performance and Kinetic Model of a Single-Stage Anaerobic Digestion System Operated at Different Successive Operating Stages for the Treatment of Food Waste

Optimization of Pre-Treatment Process Parameters to Generate Biodiesel from Microalga

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