Quispe Arpasi, Diana Elizabeth
Preferred name
Quispe Arpasi, Diana Elizabeth
Main Affiliation
Email
diana.qa@upeu.edu.pe
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12 resultados
Mostrando 1 - 10 de 12
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Item type:Publicación, Tratamento anaeróbio da fase aquosa da liquefação hidrotérmica de Spirulina associado a microaeração e fotocatálise(2021-12-20)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 post-treatment 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. - Some of the metrics are blocked by yourconsent settings
Item type:Publicación, Application of oxidative processes and anaerobic digestion in the stabilization of hydrothermal liquefaction of Spirulina wastewater(2016-10-19)O processo de liquefação hidrotermal (HTL) pode converter diversos tipos de biomassa em óleo bruto. Além do produto principal, é gerado um efluente (PHWW) com elevada carga orgânica, quantidades altas de nutrientes e compostos tóxicos. Para lidar com este tipo efluente tem-se sugerido a combinação de tratamentos físico-químicos e biológicos. O objetivo deste estudo foi avaliar a aplicação de processos oxidativos (por H2O2 e fotocatálise com TiO2) e digestão anaeróbia no tratamento do efluente da liquefação hidrotermal de Spirulina. Inicialmente caracterizou-se o efluente em termos de carga orgânica, nutrientes e compostos nitrogenados cíclicos (CNC). Posteriormente, avaliou-se a concentração de oxidante e o tempo de reação no processo de oxidação com H2O2. O tratamento fotocatalítico foi então avaliada no tratamento do efluente em questão, isoladamente, em sequência e combinada ao processo de oxidação por ação de H2O2. Finalmente combinaram-se os processos de oxidação por ação de H2O2 e digestão anaeróbia no tratamento de efluente de PHWW. O efluente da liquefação hidrotermal de Spirulina apresentou elevada carga orgânica, pH alcalino e concentrações altas de nutrientes (nitrogênio e fósforo). Verificou-se também a presença de CNC como pirazinas, δ-valerolactama, caprolactama e butirolactama. A aplicação do processo oxidativo por H2O2 no tratamento de PHWW apresentou efeitos positivos, principalmente para a descoloração que atingiu 93,8 %. A eficiência máxima de remoção de DQO foi de 15,3%. Foi percebida também redução nas concentrações dos CNC. A eficiência do processo de oxidação avançada por fotocatálise e H2O2 foi maior do que obtida quando estes processos foram aplicados separadamente. A aplicação dos processos combinados apresentou eficiência de remoção de cor e DQO semelhante às obtidas quando os processos foram aplicados em sequência, propiciando economia de tempo de reação. Por fim, verificou-se que a digestão anaeróbia do efluente pré-tratado com H2O2 apresentou maior produção de CH4 e remoção de matéria orgânica quando comparada com a digestão anaeróbia que o efluente in natura. Assim, conclui-se a utlização de processos oxidativos avançados ou a combinação da oxidação por H2O2 com a digestão anaeróbia são alternativas promissoras para o tratamento da PHWW. - Some of the metrics are blocked by yourconsent settings
Item type:Publicación, Effect of <i>Rhodococcus opacus</i> PD630 on selenium phytoremediation by <i>Brassica oleracea</i>(2024-02-13); Piet N.L. Lensfor Se phytoextraction from polluted soils. - Some of the metrics are blocked by yourconsent settings
Item type:Publicación, Anaerobic treatment of post-hydrothermal liquefaction wastewater from >i<Spirulina>/i< associated with microaeration and photocatalysis(2021-12-20)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. - Some of the metrics are blocked by yourconsent settings
Item type:Publicación, Anaerobic and photocatalytic treatments of post-hydrothermal liquefaction wastewater using H2O2(2018-08-23); - Some of the metrics are blocked by yourconsent settings
Item type:Publicación, Post-treatment of Anaerobically Digested Hydrothermal Liquefaction Wastewater Using UV Photodegradation(2021-08-19); - Some of the metrics are blocked by yourconsent settings
Item type:Publicación, Continuous Anaerobic Treatment of the Aqueous Phase of Hydrothermal Liquefaction from Spirulina Using a Horizontal-Flow Anaerobic Immobilized Biomass (HAIB) Reactor(2021-02-26); - Some of the metrics are blocked by yourconsent settings
Item type:Publicación, Anaerobic Treatment of Hydrothermal Liquefaction Wastewater from Spirulina: Kinetics and Microbial Response(2024-01-01); - Some of the metrics are blocked by yourconsent settings
Item type:Publicación, Transformations for non-destructive evaluation of brix in mango by reflectance spectroscopy and machine learning(2023-11-14); Mango is a very popular climacteric fruit in America and Europe. Among the internal properties of the mango, total soluble solids (TSS) are an adequate indicator to estimate the quality of mango, however, the measurement of this indicator requires destructive tests. Several research have addressed similar issues; they have made use of pre-processing transformations without making it clear which of them is statistically better. Here, we created a new spectral database to build machine learning (ML) models. We analyzed a total of 18 principal component regression (PCR) models and 18 partial least squared regression (PLSR) models, where 4 types of transformations, 3 different feature extractors, and 3 different pre-processing techniques are combined. The research proposes a double cross validation (CV) both to determine the optimal number of components and to obtain the final metrics. The best model had a root mean square error (RMSE) of 1.1382 °Brix and a RMSE on the transformed scale of 0.5140. The best model used 4 components, used y<sup>2</sup> transformation, reflectance R as the independent variable and MSC as a pre-processing technique. - Some of the metrics are blocked by yourconsent settings
Item type:Publicación, Anaerobic digestion of aqueous phase from hydrothermal liquefaction of Spirulina using biostimulated sludge(2020-05-19);