Anaerobic treatment of post-hydrothermal liquefaction wastewater from Spirulina associated with microaeration and photocatalysis
Hydrothermal liquefaction is a thermochemical process that is being used for the conversion of wet feedstocks into bio-crude oil. During the hydrothermal conversion of microalgae, wastewater (PHWW) with an elevated organic and aromatic content is also produced. Although anaerobic digestion can be ap...
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| Formato: | Tesis |
| Lenguaje: | inglés |
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2021
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| _version_ | 1881749964082642944 |
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| author | Quispe Arpasi, Diana Elizabeth |
| author_browse | Quispe Arpasi, Diana Elizabeth |
| author_facet | Quispe Arpasi, Diana Elizabeth |
| author_sort | Quispe Arpasi, Diana Elizabeth |
| collection | Producción científica |
| description | Hydrothermal liquefaction is a thermochemical process that is being used for the conversion of wet feedstocks into bio-crude oil. During the hydrothermal conversion of microalgae, wastewater (PHWW) with an elevated organic and aromatic content is also produced. Although anaerobic digestion can be applied as a stage of energy recovery, the application of other methods that could enhance PHWW treatment is necessary. Firstly, the anaerobic treatment of PHWW was investigated in a sequencing batch process. The effect of increasing organic matter concentrations, measured as chemical oxygen demand (COD), was assessed (1.6, 2.4, 3.2, 4, and 4.8 gCOD.L -1 ). COD removal efficiencies and CH4 yields ranged from 53% to 49% and from 180 to 158 NmL.gCODadd -1 , respectively, for influent COD values up to 3.2 g.L -1 . Higher organic loads presented a drop in COD removal, CH4 yield, and a volatile fatty acids accumulation. Regarding the kinetic evaluation, the experimental data were adjusted to the modified Haldane model, observing a strong inhibition at COD concentrations above 3.7 gCOD.L -1 . Trichococcus, Aminobacteria, and Methanosarcina were the most representative microorganisms after biomass acclimation to PHWW. In second place, the effect of intermittent aeration in the anaerobic digestion of PHWW was assessed in two sequencing batch processes, R1 full anaerobic and R2 anaerobic-aerated. Three increasing organic matter were investigated (1.6, 3.2, and 4.8 gCOD.L -1 ). Results from R2 presented higher COD removal efficiencies for each condition evaluated. Moreover, metabolites accumulation observed in R1 was minimized in R2, and phenolic removal was also improved. On the other hand, CH4 production was reduced by 45% due to oxygen availability. Aerobic microorganisms capable of degrading aromatic compounds were enriched in R2. Finally, photocatalysis as a posttreatment of anaerobically digested PHWW was investigated. Removal efficiencies reached 50% for COD, 83% for phenolic compounds, and 95% for color, under optimum conditions of pH (9.6) and H2O2 addition (3.55g.L -1 ). Ecotoxicity assays with Daphnia similis and Eruca sativa Mill resulted in treated PHWW not negatively influenced by photocatalysis. |
| format | Thesis |
| fuente_str | CRIS |
| id | oai:cris.upeu.edu.pe:20.500.15037/517 |
| institution | UPeU |
| language | English |
| publishDate | 2021 |
| publishDateRange | 2021 |
| publishDateSort | 2021 |
| record_format | dspace |
| spelling | oai:cris.upeu.edu.pe:20.500.15037/5172026-10-30T16:14:40ZAnaerobic treatment of post-hydrothermal liquefaction wastewater from Spirulina associated with microaeration and photocatalysisQuispe Arpasi, Diana ElizabethHydrothermal liquefactionChemical oxygen demandChemistryWastewaterOrganic matterAerationAnaerobic digestionPulp and paper industryAnaerobic exerciseEnvironmental chemistryAnaerobic respirationEnvironmental engineeringEnvironmental scienceMethaneBiologyBiochemistryOrganic chemistryPhysiologyCatalysisEngineeringPhysical Sciences Engineering Building and Construction Anaerobic Digestion and Biogas ProductionPhysical Sciences Engineering Biomedical Engineering Thermochemical Biomass Conversion ProcessesPhysical Sciences Engineering Biomedical Engineering Biofuel production and bioconversionHydrothermal liquefaction is a thermochemical process that is being used for the conversion of wet feedstocks into bio-crude oil. During the hydrothermal conversion of microalgae, wastewater (PHWW) with an elevated organic and aromatic content is also produced. Although anaerobic digestion can be applied as a stage of energy recovery, the application of other methods that could enhance PHWW treatment is necessary. Firstly, the anaerobic treatment of PHWW was investigated in a sequencing batch process. The effect of increasing organic matter concentrations, measured as chemical oxygen demand (COD), was assessed (1.6, 2.4, 3.2, 4, and 4.8 gCOD.L -1 ). COD removal efficiencies and CH4 yields ranged from 53% to 49% and from 180 to 158 NmL.gCODadd -1 , respectively, for influent COD values up to 3.2 g.L -1 . Higher organic loads presented a drop in COD removal, CH4 yield, and a volatile fatty acids accumulation. Regarding the kinetic evaluation, the experimental data were adjusted to the modified Haldane model, observing a strong inhibition at COD concentrations above 3.7 gCOD.L -1 . Trichococcus, Aminobacteria, and Methanosarcina were the most representative microorganisms after biomass acclimation to PHWW. In second place, the effect of intermittent aeration in the anaerobic digestion of PHWW was assessed in two sequencing batch processes, R1 full anaerobic and R2 anaerobic-aerated. Three increasing organic matter were investigated (1.6, 3.2, and 4.8 gCOD.L -1 ). Results from R2 presented higher COD removal efficiencies for each condition evaluated. Moreover, metabolites accumulation observed in R1 was minimized in R2, and phenolic removal was also improved. On the other hand, CH4 production was reduced by 45% due to oxygen availability. Aerobic microorganisms capable of degrading aromatic compounds were enriched in R2. Finally, photocatalysis as a posttreatment of anaerobically digested PHWW was investigated. Removal efficiencies reached 50% for COD, 83% for phenolic compounds, and 95% for color, under optimum conditions of pH (9.6) and H2O2 addition (3.55g.L -1 ). Ecotoxicity assays with Daphnia similis and Eruca sativa Mill resulted in treated PHWW not negatively influenced by photocatalysis.Thesishttp://www.teses.usp.br/teses/disponiveis/74/74132/tde-16082022-143011/publico/DO8849147COR.pdfhttps://doi.org/10.11606/t.74.2021.tde-16082022-14301110.11606/t.74.2021.tde-16082022-143011https://hdl.handle.net/20.500.15037/517W4292369328en2021-12-202026-06-13T08:15:55Z2026-06-13T08:15:55Z |
| spellingShingle | Hydrothermal liquefaction Chemical oxygen demand Chemistry Wastewater Organic matter Aeration Anaerobic digestion Pulp and paper industry Anaerobic exercise Environmental chemistry Anaerobic respiration Environmental engineering Environmental science Methane Biology Biochemistry Organic chemistry Physiology Catalysis Engineering Physical Sciences Engineering Building and Construction Anaerobic Digestion and Biogas Production Physical Sciences Engineering Biomedical Engineering Thermochemical Biomass Conversion Processes Physical Sciences Engineering Biomedical Engineering Biofuel production and bioconversion Quispe Arpasi, Diana Elizabeth Anaerobic treatment of post-hydrothermal liquefaction wastewater from Spirulina associated with microaeration and photocatalysis |
| title | Anaerobic treatment of post-hydrothermal liquefaction wastewater from Spirulina associated with microaeration and photocatalysis |
| title_full | Anaerobic treatment of post-hydrothermal liquefaction wastewater from Spirulina associated with microaeration and photocatalysis |
| title_fullStr | Anaerobic treatment of post-hydrothermal liquefaction wastewater from Spirulina associated with microaeration and photocatalysis |
| title_full_unstemmed | Anaerobic treatment of post-hydrothermal liquefaction wastewater from Spirulina associated with microaeration and photocatalysis |
| title_short | Anaerobic treatment of post-hydrothermal liquefaction wastewater from Spirulina associated with microaeration and photocatalysis |
| title_sort | anaerobic treatment of post hydrothermal liquefaction wastewater from spirulina associated with microaeration and photocatalysis |
| topic | Hydrothermal liquefaction Chemical oxygen demand Chemistry Wastewater Organic matter Aeration Anaerobic digestion Pulp and paper industry Anaerobic exercise Environmental chemistry Anaerobic respiration Environmental engineering Environmental science Methane Biology Biochemistry Organic chemistry Physiology Catalysis Engineering Physical Sciences Engineering Building and Construction Anaerobic Digestion and Biogas Production Physical Sciences Engineering Biomedical Engineering Thermochemical Biomass Conversion Processes Physical Sciences Engineering Biomedical Engineering Biofuel production and bioconversion |
| topic_facet | Hydrothermal liquefaction Chemical oxygen demand Chemistry Wastewater Organic matter Aeration Anaerobic digestion Pulp and paper industry Anaerobic exercise Environmental chemistry Anaerobic respiration Environmental engineering Environmental science Methane Biology Biochemistry Organic chemistry Physiology Catalysis Engineering Physical Sciences Engineering Building and Construction Anaerobic Digestion and Biogas Production Physical Sciences Engineering Biomedical Engineering Thermochemical Biomass Conversion Processes Physical Sciences Engineering Biomedical Engineering Biofuel production and bioconversion |
| url | http://www.teses.usp.br/teses/disponiveis/74/74132/tde-16082022-143011/publico/DO8849147COR.pdf https://doi.org/10.11606/t.74.2021.tde-16082022-143011 https://hdl.handle.net/20.500.15037/517 |
| work_keys_str_mv | AT quispearpasidianaelizabeth anaerobictreatmentofposthydrothermalliquefactionwastewaterfromspirulinaassociatedwithmicroaerationandphotocatalysis |