Reuse of microalgae grown in full-scale wastewater treatment ponds: Thermochemical pretreatment and biogas production

Passos, Fabiana; Félix, Leonardo Bonato; Rocha, H.A.; Pereira, Jackson de Oliveira; Aquino, Sérgio Francisco de

doi:10.1016/j.biortech.2016.03.006

Cited by 45 publications

(18 citation statements)

References 18 publications

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“…Although C pretreatment reported a slightly higher volatile solids release than D, the biogas production was remarkably lower and very similar to the untreated biomass (C1: 173 mLCH 4 /g VS; 42% biodegradability and NP 1.08) and also contained a considerable lag phase. Passos et al, (2016a) reported increases on methane production of 82% with respect to the untreated biomass for alkaline pretreatment at low NaOH concentrations (0.5%, 80ºC, 2 hours), but the methane production from the untreated biomass was very low in this study (78 mL CH 4 /g VS).…”

Section: Test 1: Bmp Of Untreated Raw Materials and Of Pretreated Whomentioning

confidence: 79%

“…They reported an increase in methane production up to 82% and 86% compared to the untreated biomass (78 mL CH4/g VS) for alkaline and acid pretreatments, respectively. Nevertheless, Passos et al, (2016a) also observed an inhibitory effect under severe pretreatment conditions. Most of the reported degradation compounds generated by pretreatments in algae or other types of biomasses were soluble and released to the liquid phase Bolado, 2014, Bolado-Rodríguez et al, 2016).…”

Section: Introductionmentioning

confidence: 95%

“…Acid pretreatments provided even lower methane production than untreated material with an NP of 0.95 for K1 and 0.90 for L1. However, Passos et al, (2016a) reported an increase of methane production of 86% with respect to the untreated biomass for acid pretreatment at 0.5%, 80ºC for 2 hours. However, as mentioned previously, the methane production in this study was very low.…”

Section: Test 1: Bmp Of Untreated Raw Materials and Of Pretreated Whomentioning

confidence: 99%

“…Moreover, the high mass losses by solubilisation in these experiments should be still considered. Passos et al, (2016a) also used the Gompertz model to fit the methane production from microalgae grown in urban wastewater and pretreated with KOH, even while working with lower concentrations. They reported lag phases that increased with the alkaline concentration from 1.20 days with KOH 0.5% up to 6 days with KOH 2.0%.…”

Section: Kineticsmentioning

confidence: 99%

“…However, in this case, ultrasound pretreatment (26700 J/g TS) did not significantly improve methane production. In another study, Passos et al, (2016a) studied the effect of two thermochemical pretreatments (KOH and HCl) on biogas production from microalgal biomass. They reported an increase in methane production up to 82% and 86% compared to the untreated biomass (78 mL CH4/g VS) for alkaline and acid pretreatments, respectively.…”

Section: Introductionmentioning

confidence: 99%

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Effect of pretreatments on biogas production from microalgae biomass grown in pig manure treatment plants

Juarez

Pastor

Sevilla

et al. 2018

Bioresource Technology

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Please cite this article as: Martín Juárez, J., Riol Pastor, E., Fernández Sevilla, J.M., Muñoz Torre, R., García-Encina, P.A., Bolado Rodríguez, S., Effect of pretreatments on biogas production from microalgae biomass grown in pig manure treatment plants, Bioresource Technology (2018), doi: https://doi.org/10. 1016/j.biortech.2018.02.063 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. ABSTRACTMethane production from pretreated and raw mixed microalgae biomass grown in pig manure was evaluated. Acid and basic pretreatments provided the highest volatile solids solubilisation (up to 81%) followed by alkaline-peroxide and ultrasounds (23%).Bead milling and steam explosion remarkably increased the methane production rate, although the highest yield (377 mL CH 4 /g SV) was achieved by alkali pretreatment.Nevertheless, some pretreatments inhibited biogas production and resulted in lag phases of 7-9 days. Hence, experiments using only the pretreated solid phase were performed, which resulted in a decrease in the lag phase to 2-3 days for the alkali pretreatment and slightly increased biomass biodegradability of few samples. The limiting step during the BMP test (hydrolysis or microbial inhibition) for each pretreatment was elucidated using the goodness of fitting to a first order or a Gompertz model. Finally, the use of digestate as biofertilizer was evaluated applying a biorefinery concept. Highlights Pretreatments solubilised volatile solids but also inhibited biogas production. Alkali pretreatment increased 2.3 times the methane production of the raw material. The removal of pretreated liquids did not improve the global methane production. Gompertz model fitted the results of methane production controlled by inhibition. Composition of digestates allows their possible valorisation as fertilizers.

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Section: Test 1: Bmp Of Untreated Raw Materials and Of Pretreated Whomentioning

confidence: 79%

Section: Introductionmentioning

confidence: 95%

Section: Test 1: Bmp Of Untreated Raw Materials and Of Pretreated Whomentioning

confidence: 99%

Section: Kineticsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of pretreatments on biogas production from microalgae biomass grown in pig manure treatment plants

Juarez

Pastor

Sevilla

et al. 2018

Bioresource Technology

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A comprehensive review on pretreatment of microalgae for biogas production

Çakmak

Uğurlu

2018

Int J Energy Res

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Summary Use of microalgal biomass for renewable energy production has gained considerable attention in the world due to increasing global energy demand and negative environmental impacts of nonrenewable fossil fuels. Anaerobic digestion is one of the renewable technologies that microalgal biomass is converted into biogas by anaerobic archea. One of the main drawbacks of using microalgal biomass for biogas production is that certain types of microalgae has rigid cell wall characteristics, which limits accessibility of anaerobic archea to microalgal intracellular organic matter during hydrolysis phase. This limitation lowers efficiency of biogas production from microalgal biomass. However, introducing pretreatment methods prior to anaerobic digestion provides disruption of rigid microalgal cell wall and improve biogas yields from microalgal biomass. The objective of this paper was to review current knowledge related to pretreatment methods applied prior to anaerobic digestion of microalgal biomass. Efficiency and applicability of pretreatment methods mainly depend on type of microalgae, cell wall characteristics, and cost and energy requirements during pretreatment process. In this review, various type of pretreatment methods applied to microalgal biomass was discussed in detail with background knowledge and literature studies in their potential on maximization of biogas yields and their cost effectiveness, which is important for large‐scale applications. In the view of current knowledge, it was concluded that each pretreatment method has a relative contribution to improvement in biogas production depending on the type of microalgae. However, energy and cost requirements are the main limitations for pretreatment. So, further studies should focus on reduction of cost and energy demand by introducing combined methods, novel chemicals, and on‐site or immobilized enzymes in pretreatment to increase feasibility of pretreatment prior to anaerobic digestion in industrial scale.

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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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Reuse of microalgae grown in full-scale wastewater treatment ponds: Thermochemical pretreatment and biogas production

Cited by 45 publications

References 18 publications

Effect of pretreatments on biogas production from microalgae biomass grown in pig manure treatment plants

Effect of pretreatments on biogas production from microalgae biomass grown in pig manure treatment plants

A comprehensive review on pretreatment of microalgae for biogas production

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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