Influence of Biogas Flow Rate on Biomass Composition During the Optimization of Biogas Upgrading in Microalgal-Bacterial Processes

Serejo, Mayara Leite; Posadas, Esther; Boncz, Marc Árpád; Blanco, Saúl; García‐Encina, Pedro A.; Muñoz, Raúl

doi:10.1021/es5056116

Cited by 158 publications

(109 citation statements)

References 34 publications

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“…H 2 S was not included, because of its complete removal reported by Serejo et al (2015) regardless of the operational conditions. Centrate wastewater, which is characterized by a low biodegradable fraction and a high concentration of nutrients (Bahr et al, 2014;Posadas et al, 2013), was obtained from the digested sludge-concentrating centrifuges at Valladolid wastewater treatment plant (WWTP) (Spain) and stored at 4 ºC prior to use.…”

Section: Simulated Biogas and Centratementioning

confidence: 99%

“…Despite the recent interest and intensive research conducted worldwide on microalgae cultivation as a promising technology for biofuel production, CO 2 mitigation and wastewater treatment, the number of experimental studies evaluating the performance of such an integrated process is scarce (Park et al 2011;Serejo et al, 2015;Posadas et al, 2015). Thus, the main emphasis has been on pilot scale experiments focusing on biogas upgrading and wastewater treatment (Bahr et al, 2014;Heubeck et al, 2007 …”

Section: Introductionmentioning

confidence: 99%

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Feasibility study of biogas upgrading coupled with nutrient removal from anaerobic effluents using microalgae-based processes

et al. 2015

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The present research was conducted in order to simultaneously optimize biogas upgrading and carbon and nutrient removal from centrates in a 180 L high rate algal pond interconnected to an external CO 2 absorption unit. Different biogas and centrate supply strategies were assessed in order to increase biomass lipid content. Results showed 99% CO 2 removal efficiencies from simulated biogas at liquid recirculation rates in the absorption column of 9.9 m 3 m -2 h -1 , concomitant with nitrogen and phosphorus removal efficiencies of 100% and 82%, respectively, using a 1:70 diluted centrate at a hydraulic retention time of 7 days. The lipid content of the harvested algal-bacterial biomass remained low (2.9-11.2%) regardless of the operational conditions, with no particular trend over the time. The good settling characteristics of the algal-bacterial flocs resulted in harvesting efficiencies over 95%, which represented a cost-effective alternative for algal biomass reutilization compared to conventional physical-chemical techniques.Finally, high microalgae biodiversity was found regardless of the operational conditions. 2

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Section: Simulated Biogas and Centratementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Feasibility study of biogas upgrading coupled with nutrient removal from anaerobic effluents using microalgae-based processes

et al. 2015

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Section: Methodsmentioning

confidence: 99%

“…The starch content was measured following the 996.11 AOAC method. The protein and lipid content were determined using the Lowry method and Kochert method, respectively (Serejo et al, 2015).The content of moisture, extractives, ash and insoluble residue in raw biomass samples was analysed following NREL (National Renewable Energy Laboratory -USA) analytical procedures. The carbohydrate content in the raw and pretreated microalgae was determined by HPLC-RI using a modified NREL procedure.…”

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confidence: 99%

Saccharification of microalgae biomass obtained from wastewater treatment by enzymatic hydrolysis. Effect of alkaline-peroxide pretreatment

Juarez

Lorenzo-Hernando

Muñoz

et al. 2016

Bioresource Technology

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An enzymatic method for the carbohydrate hydrolysis of different microalgae biomass cultivated in domestic (DWB) † and pig manure (PMWB) wastewaters, at different storage conditions (fresh, freeze-dried and reconstituted), was evaluated. The DWB provided sugars yields between 40 and 63%, although low xylose yields (< 23.5%).Approximately 2% of this biomass was converted to byproducts as succinic, acetic and formic acids. For PMWB, a high fraction of the sugars (up to 87%) was extracted, but mainly converted into acetic, butyric and formic acids, which was attributed to the bacterial action. In addition, the performance of an alkaline-peroxide pretreatment, conducted for 1 hour, 50ºC and H 2 O 2 concentrations from 1 to 7.5% (w/w), was essayed. The hydrolysis of pretreated microalgae supported a wide range of sugars extraction for DWB (55-90%), and 100% for PMWB. Nevertheless, a large fraction of these sugars (~30% for DWB and 100% for PMWB) was transformed to byproducts. HighlightsTested biomass showed different behaviours depending on the algae/bacteria ratio.Enzymatic hydrolysis of DWB yielded high glucose and low xylose extraction.Sugars from PMWB were completely released by enzymatic hydrolysis but oxidized.Acetic, formic and succinic acids were the main byproducts from released sugars.Pretreatment enhanced enzymatic hydrolysis performance for almost all biomass tested. † Abbreviations: DWB, domestic wastewater biomass; PMWB, pig manure microalgae biomass; HRT, hydraulic retention time; SRT, sludge retention time; CO 2 , carbon dioxide; CH 4 , methane. Keywords: Enzymatic hydrolysis; Glucose; Xylose; Wastewater; Alkaline-peroxide pretreatment IntroductionWorld human population and industrial activity have exponentially increased during last decades, with a concomitant raise in global energy demand. This growth has been traditionally based on fossil fuels, whose side effects have turned this dependence environmentally unsustainable (Chisti, 2007). New renewable fuel sources and biorefinery approaches for designing cost-effective and "green" processes are expected to create more efficient and sustainable economies (Daroch et al., 2013). During the past decade, microalgae have experimented a continuous and positive development due to their wide range of practical applications: wastewater treatment, nitrogen and phosphorous recovery, biogas upgrading, production of biofuels, biofertilizers, animal and fish feed, etc. Despite Oswald and co-workers were pioneers in introducing the microalgae biorefinery concept in the 60's, the combination and optimization of processes for the valorisation of microalgae biomass obtained from wastewaters treatment remains a challenge nowadays (Acién et al, 2014).Microalgae biomass is mainly composed of proteins (6% -52%), lipids (5% -23%) and carbohydrates (7% -23%) (Tijani et al., 2015). This content may vary within microalgae strains and is highly dependent on cultivation conditions, especially under nutrients-deprivation scenarios. Among them, carbohydrates are one of th...

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“…These processes require considerable amount of energy and their operation may be complex [102]. Microalgae biomass production and biogas upgrading can be also integrated with digestate liquid fraction treatment [103]. Figure 5 shows the microalgae biomass production and biogas upgrading integration.…”

Section: Phycoremediationmentioning

confidence: 99%

Nutrient recovery technologies for anaerobic digestion systems: An overview

Romero-Güiza

Mata‐Alvarez

Rivera

et al. 2016

rev.ion

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Influence of Biogas Flow Rate on Biomass Composition During the Optimization of Biogas Upgrading in Microalgal-Bacterial Processes

Cited by 158 publications

References 34 publications

Feasibility study of biogas upgrading coupled with nutrient removal from anaerobic effluents using microalgae-based processes

Feasibility study of biogas upgrading coupled with nutrient removal from anaerobic effluents using microalgae-based processes

Saccharification of microalgae biomass obtained from wastewater treatment by enzymatic hydrolysis. Effect of alkaline-peroxide pretreatment

Nutrient recovery technologies for anaerobic digestion systems: An overview

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