Pub Date : 2023-12-19DOI: 10.15628/holos.2023.16353
Laura Maria Canno Ferreira Fais, Thiago Feitosa, André Luís Sotero Salustiano Martim, Talia Simões dos Santos Ximenes
With the advancement of technology, sensors have been developed for various applications, including detecting leaks in water distribution networks. This work aims to propose a low-cost system for detecting leaks in water networks. The tests were carried out in a simulated network at the Hydraulics and Fluid Mechanics Laboratory of the Faculty of Civil Engineering and Urbanism at UNICAMP, where sensors were installed to measure flow, water level, noise, turbidity, temperature and an extensometer. Real-time readings were received and processed by a microcontroller board (Arduino UNO), and sent to a web page (PHP language) via a Wi-Fi module (ESP8266). An application was also developed, in Java language, to visualize the readings obtained. In laboratory tests, the sensors proved suitable for detecting leaks and triggering audible and visual alarms in the event of leaks
{"title":"LOW-COST SYSTEM FOR LEAK DETECTION IN WATER SUPPLY NETWORKS","authors":"Laura Maria Canno Ferreira Fais, Thiago Feitosa, André Luís Sotero Salustiano Martim, Talia Simões dos Santos Ximenes","doi":"10.15628/holos.2023.16353","DOIUrl":"https://doi.org/10.15628/holos.2023.16353","url":null,"abstract":"With the advancement of technology, sensors have been developed for various applications, including detecting leaks in water distribution networks. This work aims to propose a low-cost system for detecting leaks in water networks. The tests were carried out in a simulated network at the Hydraulics and Fluid Mechanics Laboratory of the Faculty of Civil Engineering and Urbanism at UNICAMP, where sensors were installed to measure flow, water level, noise, turbidity, temperature and an extensometer. Real-time readings were received and processed by a microcontroller board (Arduino UNO), and sent to a web page (PHP language) via a Wi-Fi module (ESP8266). An application was also developed, in Java language, to visualize the readings obtained. In laboratory tests, the sensors proved suitable for detecting leaks and triggering audible and visual alarms in the event of leaks","PeriodicalId":13167,"journal":{"name":"Holos","volume":null,"pages":null},"PeriodicalIF":0.1,"publicationDate":"2023-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138961885","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-12-19DOI: 10.15628/holos.2023.16342
Tatiane MARTINS DE ASSIS, Fabiane Burgath, Priscila Wosiack, Elaine Stolle, João Nizer, Gabriel Cunha, G. Queiroz, A. C. Barana
Este trabalho operou um reator piloto, instalado em uma estação de tratamento de esgoto sanitário real. O reator contou com leito fixo empacotado de Biobob®, estrutura em polietileno de alta densidade com poliuretano expandido, volume total de 5,65m3 e útil de 3,20m3 e fluxo ascendente. O objetivo do reator foi a remoção de Nitrogênio Total via Nitrificação e Desnitrificação Simultânea e remoção de DQO. O reator operou com aeração intermitente e TDH de 10, 12 e 20h, a alimentação ocorreu com substratos nas razões 1:1 (v:v) esgoto bruto/efluente de UASB; e efluente do UASB. O reator suportou as variações de carga da ETE, adversidades comuns de sistemas em larga escala. A etapa E2 - alimentação bruto:UASB, se destacou com média de remoção de N de 55% e remoção média de DQO em 81%. As imagens obtidas por MEV demonstraram que houve sinergia entre bactérias nitrificantes, desnitrificantes e arqueas metanogênicas.
{"title":"USO DE REATOR DE LEITO FIXO EM MEIO SUPORTE BIOBOB®, OPERANDO EM ESCALA PILOTO NA REMOÇÃO DE DQO E NITROGÊNIO TOTAL DE ESGOTO SANITÁRIO","authors":"Tatiane MARTINS DE ASSIS, Fabiane Burgath, Priscila Wosiack, Elaine Stolle, João Nizer, Gabriel Cunha, G. Queiroz, A. C. Barana","doi":"10.15628/holos.2023.16342","DOIUrl":"https://doi.org/10.15628/holos.2023.16342","url":null,"abstract":"Este trabalho operou um reator piloto, instalado em uma estação de tratamento de esgoto sanitário real. O reator contou com leito fixo empacotado de Biobob®, estrutura em polietileno de alta densidade com poliuretano expandido, volume total de 5,65m3 e útil de 3,20m3 e fluxo ascendente. O objetivo do reator foi a remoção de Nitrogênio Total via Nitrificação e Desnitrificação Simultânea e remoção de DQO. O reator operou com aeração intermitente e TDH de 10, 12 e 20h, a alimentação ocorreu com substratos nas razões 1:1 (v:v) esgoto bruto/efluente de UASB; e efluente do UASB. O reator suportou as variações de carga da ETE, adversidades comuns de sistemas em larga escala. A etapa E2 - alimentação bruto:UASB, se destacou com média de remoção de N de 55% e remoção média de DQO em 81%. As imagens obtidas por MEV demonstraram que houve sinergia entre bactérias nitrificantes, desnitrificantes e arqueas metanogênicas. \u0000 \u0000 ","PeriodicalId":13167,"journal":{"name":"Holos","volume":null,"pages":null},"PeriodicalIF":0.1,"publicationDate":"2023-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138960106","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The burning of rice husks produces natural silica and generates charcoal with excellent properties for the adsorption of different pollutants. The objective of this study was to enhance the adsorption properties of this industrial residue from burning rice husk through acid and base purifications. The raw coal (RC) was initially modified with HCl(aq.) and then with NaOH(aq.), and subsequently renamed MC. Efficiency was verified by the adsorption of methylene blue (MB) dye, considering a concentration of 10 mg L-1, dosage of 0.05 g L-1, pH 6.7, and 120 min. MB removal was 78% for RC and 97% for MC, with experimental capacities of 144.78 mg g-1 and 180.78 mg g-1, respectively. The kinetics were better adjusted by Avrami (R2 0.99, error <2.8%). The properties of charcoal improved with the modification, presenting a more porous structure, greater surface area and functional groups that contributed to adsorption, proving that simple purification methods, such as acid-base purification, can be crucial for waste reuse.
{"title":"PURIFICAÇÃO ÁCIDO-BASE EXPERIMENTAL DE CASCAS DE ARROZ CARBONIZADAS: EXPLORANDO SUA EFICÁCIA NA ADSORÇÃO DE RESÍDUOS NÃO VALORIZADOS DA INDÚSTRIA DE ARROZ","authors":"Larissa Crestani, Danielli Martins Sanderi, Yasmin Vieira, Guilherme Luiz Dotto","doi":"10.15628/holos.2023.16309","DOIUrl":"https://doi.org/10.15628/holos.2023.16309","url":null,"abstract":"The burning of rice husks produces natural silica and generates charcoal with excellent properties for the adsorption of different pollutants. The objective of this study was to enhance the adsorption properties of this industrial residue from burning rice husk through acid and base purifications. The raw coal (RC) was initially modified with HCl(aq.) and then with NaOH(aq.), and subsequently renamed MC. Efficiency was verified by the adsorption of methylene blue (MB) dye, considering a concentration of 10 mg L-1, dosage of 0.05 g L-1, pH 6.7, and 120 min. MB removal was 78% for RC and 97% for MC, with experimental capacities of 144.78 mg g-1 and 180.78 mg g-1, respectively. The kinetics were better adjusted by Avrami (R2 0.99, error <2.8%). The properties of charcoal improved with the modification, presenting a more porous structure, greater surface area and functional groups that contributed to adsorption, proving that simple purification methods, such as acid-base purification, can be crucial for waste reuse. \u0000 ","PeriodicalId":13167,"journal":{"name":"Holos","volume":null,"pages":null},"PeriodicalIF":0.1,"publicationDate":"2023-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138995276","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-12-18DOI: 10.15628/holos.2023.16307
Maria Eduarda Aranega Pesenti, Thiago Andrade Marques, Vitor Antonio Campos, Stephanie Luana Urata, K. Prates
This study compares the efficiency in reducing the toxicity of leachate from a landfill after the application of mycoremediation processes using Candida spp. and Trichophyton spp. fungi through bioassays with Allium cepa seeds. Experimental units were set up for leachate treatment with varying concentrations, inoculated with the selected fungi, and incubated. After incubation, bioassays were conducted using the liquid extract to inoculate ten Allium cepa seeds on Petri dishes. Subsequently, macroscopic analysis indices were calculated. The results revealed that Candida spp. yeast showed superior toxicity reduction results in all experimental units. In conclusion, among the analyzed genera, Candida spp. yeast demonstrates greater efficiency and holds promise for reducing the toxicity of landfill leachate.
{"title":"AVALIAÇÃO DO POTENCIAL BIORREMEDIADOR DOS FUNGOS CANDIDA spp. E TRICHOPHYTON spp. NO TRATAMENTO DE LIXIVIADO PROVENIENTE DE ATERRO SANITÁRIO","authors":"Maria Eduarda Aranega Pesenti, Thiago Andrade Marques, Vitor Antonio Campos, Stephanie Luana Urata, K. Prates","doi":"10.15628/holos.2023.16307","DOIUrl":"https://doi.org/10.15628/holos.2023.16307","url":null,"abstract":"This study compares the efficiency in reducing the toxicity of leachate from a landfill after the application of mycoremediation processes using Candida spp. and Trichophyton spp. fungi through bioassays with Allium cepa seeds. Experimental units were set up for leachate treatment with varying concentrations, inoculated with the selected fungi, and incubated. After incubation, bioassays were conducted using the liquid extract to inoculate ten Allium cepa seeds on Petri dishes. Subsequently, macroscopic analysis indices were calculated. The results revealed that Candida spp. yeast showed superior toxicity reduction results in all experimental units. In conclusion, among the analyzed genera, Candida spp. yeast demonstrates greater efficiency and holds promise for reducing the toxicity of landfill leachate.","PeriodicalId":13167,"journal":{"name":"Holos","volume":null,"pages":null},"PeriodicalIF":0.1,"publicationDate":"2023-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138995573","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Red mud is the solid waste from bauxite processing during aluminium production. Its inadequate disposal causes social, economic and environmental prejudices. The industrial solid waste insertion evaluation in the production chain is beneficial and necessary. This work aims to evaluate the mechanical performance of asphalt mixtures produced with red mud as filling material. Asphalt mixtures with 5% and 7% red mud were produced, and permanent deformation and moisture-induced damage tests were carried out. A mixture without red mud addition (control) was produced for comparison. The results showed that the mixtures with red mud presented permanent deformation resistance greater than the control one, with more than 40% reduction in rutting deformation. The moisture damage did not significantly affect the mixtures tested. The red mud application as a filler in asphalt mixtures is viable and can be an alternative to reduce the damage such a waste can cause to the environment.
{"title":"Red mud application as filler in asphalt mixtures production","authors":"Liseane Padilha Thives, Mayara Sarisariyama Siverio Lima, Luciana Rohde","doi":"10.15628/holos.2023.16344","DOIUrl":"https://doi.org/10.15628/holos.2023.16344","url":null,"abstract":"Red mud is the solid waste from bauxite processing during aluminium production. Its inadequate disposal causes social, economic and environmental prejudices. The industrial solid waste insertion evaluation in the production chain is beneficial and necessary. This work aims to evaluate the mechanical performance of asphalt mixtures produced with red mud as filling material. Asphalt mixtures with 5% and 7% red mud were produced, and permanent deformation and moisture-induced damage tests were carried out. A mixture without red mud addition (control) was produced for comparison. The results showed that the mixtures with red mud presented permanent deformation resistance greater than the control one, with more than 40% reduction in rutting deformation. The moisture damage did not significantly affect the mixtures tested. The red mud application as a filler in asphalt mixtures is viable and can be an alternative to reduce the damage such a waste can cause to the environment.","PeriodicalId":13167,"journal":{"name":"Holos","volume":null,"pages":null},"PeriodicalIF":0.1,"publicationDate":"2023-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139175238","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-12-18DOI: 10.15628/holos.2023.16306
SeyedMehdi Mohammadizadeh, José Gilberto Dalfré Filho, Cassiano Sampaio Descovi, Luis Fernando Murillo Bermúdez, Daniel Alfonso Sierra, Gerarld Corzo Pérez
This study is dedicated to the examination of cavitation-induced erosion, a critical factor in optimizing the efficiency of hydraulic systems, including hydropower plants and pumping systems. To accomplish this, we conducted a sensitivity analysis utilizing a cavitation jet apparatus (CJA) and an experimental configuration that featured a vertical cylindrical test tank, a submerged nozzle, and an aluminum sample (specifically, alloy 6351 T6). The study maintained a consistent standoff distance of 5 cm and an orifice diameter of 2 × 10-3 m. Two distinct nozzle geometries were tested to assess their influence on cavitation erosion. The outcomes revealed that the 20° conical sharped-edges nozzle resulted in the highest erosion rates, while the commercial nozzle (MEG 2510) caused comparatively less erosion. By standardizing the test duration to 1200 seconds and using a cavitation index of 0.14, the researchers avoided overlapping pits. In summary, the CJA, with these adjustments, demonstrated its effectiveness as a tool for evaluating the resistance of solid surfaces to cavitation.
{"title":"AVALIAÇÃO DA EROSÃO POR CAVITAÇÃO EM SUPERFÍCIES SÓLIDAS USANDO UM APARATO DE JATO DE CAVITAÇÃO","authors":"SeyedMehdi Mohammadizadeh, José Gilberto Dalfré Filho, Cassiano Sampaio Descovi, Luis Fernando Murillo Bermúdez, Daniel Alfonso Sierra, Gerarld Corzo Pérez","doi":"10.15628/holos.2023.16306","DOIUrl":"https://doi.org/10.15628/holos.2023.16306","url":null,"abstract":"This study is dedicated to the examination of cavitation-induced erosion, a critical factor in optimizing the efficiency of hydraulic systems, including hydropower plants and pumping systems. To accomplish this, we conducted a sensitivity analysis utilizing a cavitation jet apparatus (CJA) and an experimental configuration that featured a vertical cylindrical test tank, a submerged nozzle, and an aluminum sample (specifically, alloy 6351 T6). The study maintained a consistent standoff distance of 5 cm and an orifice diameter of 2 × 10-3 m. Two distinct nozzle geometries were tested to assess their influence on cavitation erosion. The outcomes revealed that the 20° conical sharped-edges nozzle resulted in the highest erosion rates, while the commercial nozzle (MEG 2510) caused comparatively less erosion. By standardizing the test duration to 1200 seconds and using a cavitation index of 0.14, the researchers avoided overlapping pits. In summary, the CJA, with these adjustments, demonstrated its effectiveness as a tool for evaluating the resistance of solid surfaces to cavitation.","PeriodicalId":13167,"journal":{"name":"Holos","volume":null,"pages":null},"PeriodicalIF":0.1,"publicationDate":"2023-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138963338","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-12-18DOI: 10.15628/holos.2023.16367
Giovana Rocha De Oliveira, Larissa Botelho D’Alevedo, Suzan da Silva Lessa, M. M. M. Caetano, D. Goveia, Paulo Sergio Tonello
In this work, low molecular weight chitosan was used to adsorb the herbicide glyphosate in aqueous solution. Considering the possibilities of remediation and monitoring in aquatic environments, chitosan was formatted into thin discs 0.8 mm thick and 2.5 cm in diameter. The films were characterized by SEM, EDS and FTIR. In the adsorption study, a chitosan disc was able to adsorb 100% of a 5 mgL-1 glyphosate solution. Pseudo-first-order, pseudo-second-order and Elovich kinetic models were applied and it was found that chemisorption predominates in the adsorption process. Thus, chitosan films can act very well as a material for remediating water bodies contaminated by glyphosate. For monitoring studies, the possibility of using chitosan films in DGT (Diffusive Gradients in Thin Films) technique was verified and the diffusive material used was 1.5% agarose film (m/v). The diffusion coefficient of glyphosate in the agarose gel was determined 7.94 x 10-10 m2s-1.
{"title":"BIOPOLÍMERO QUITOSANA NA ADSORÇÃO DE GLIFOSATO: USO NO MONITORAMENTO OU REMEDIAÇÃO AMBIENTAL","authors":"Giovana Rocha De Oliveira, Larissa Botelho D’Alevedo, Suzan da Silva Lessa, M. M. M. Caetano, D. Goveia, Paulo Sergio Tonello","doi":"10.15628/holos.2023.16367","DOIUrl":"https://doi.org/10.15628/holos.2023.16367","url":null,"abstract":"In this work, low molecular weight chitosan was used to adsorb the herbicide glyphosate in aqueous solution. Considering the possibilities of remediation and monitoring in aquatic environments, chitosan was formatted into thin discs 0.8 mm thick and 2.5 cm in diameter. The films were characterized by SEM, EDS and FTIR. In the adsorption study, a chitosan disc was able to adsorb 100% of a 5 mgL-1 glyphosate solution. Pseudo-first-order, pseudo-second-order and Elovich kinetic models were applied and it was found that chemisorption predominates in the adsorption process. Thus, chitosan films can act very well as a material for remediating water bodies contaminated by glyphosate. For monitoring studies, the possibility of using chitosan films in DGT (Diffusive Gradients in Thin Films) technique was verified and the diffusive material used was 1.5% agarose film (m/v). The diffusion coefficient of glyphosate in the agarose gel was determined 7.94 x 10-10 m2s-1.","PeriodicalId":13167,"journal":{"name":"Holos","volume":null,"pages":null},"PeriodicalIF":0.1,"publicationDate":"2023-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139173291","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-12-18DOI: 10.15628/holos.2023.16315
Cassiano Sampaio Descovi, Antonio Carlos Zuffo, SeyedMehdi Mohammadizadeh, Luis Fernando Murillo Bermúdez, Daniel Alfonso Sierra
This article demonstrates the successful application of Long Short-Term Memory (LSTM) recurrent neural networks to simulate streamflow in the Aquidauana River basin, located in the Brazilian Pantanal. The LSTM network used daily precipitation data as input to predict future streamflow in the region. The results obtained from this research show a coefficient of determination (R2) of 0.82, indicating a strong fit of the model to the observed data. Additionally, the Root Mean Squared Error (RMSE) was found to be 0.53, indicating the model's accuracy in predicting streamflow compared to actual data. These findings highlight the effectiveness of LSTM networks in hydrological modeling for the Pantanal region, which is crucial for water resource planning and sustainable management in this ecologically significant area. This study is expected to serve as a catalyst for further research and make a substantial contribution to the advancement of streamflow prediction techniques in complex watersheds such as the Aquidauana River basin.
{"title":"REDES DE MEMÓRIA DE LONGO E CURTO PRAZO (LSTM) PARA PREDIÇÃO DE FLUXO DE RIO NA BACIA DO PANTANAL BRASILEIRO","authors":"Cassiano Sampaio Descovi, Antonio Carlos Zuffo, SeyedMehdi Mohammadizadeh, Luis Fernando Murillo Bermúdez, Daniel Alfonso Sierra","doi":"10.15628/holos.2023.16315","DOIUrl":"https://doi.org/10.15628/holos.2023.16315","url":null,"abstract":"This article demonstrates the successful application of Long Short-Term Memory (LSTM) recurrent neural networks to simulate streamflow in the Aquidauana River basin, located in the Brazilian Pantanal. The LSTM network used daily precipitation data as input to predict future streamflow in the region. The results obtained from this research show a coefficient of determination (R2) of 0.82, indicating a strong fit of the model to the observed data. Additionally, the Root Mean Squared Error (RMSE) was found to be 0.53, indicating the model's accuracy in predicting streamflow compared to actual data. These findings highlight the effectiveness of LSTM networks in hydrological modeling for the Pantanal region, which is crucial for water resource planning and sustainable management in this ecologically significant area. This study is expected to serve as a catalyst for further research and make a substantial contribution to the advancement of streamflow prediction techniques in complex watersheds such as the Aquidauana River basin.","PeriodicalId":13167,"journal":{"name":"Holos","volume":null,"pages":null},"PeriodicalIF":0.1,"publicationDate":"2023-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138994794","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Um reator UASB em pequena escala foi modelado para avaliar seu comportamento hidrodinâmico e comparar simulações de CFD com resultados experimentais obtidos em escala de laboratório. Foram realizadas simulações usando o Ansys® CFXTM com duas taxas de fluxo diferentes: A) 26,68 e B) 4,0 l d-1. O volume do reator era de 1,5 litros, com um volume útil de 1,38 litros. Além das simulações de CFD, foram realizados testes hidrodinâmicos com injeção de traçador, tanto experimentalmente quanto nas simulações. Foram obtidas curvas de distribuição do tempo de residência (RTD) e o modelo de número de tanques em série (NTIS) foi usado para determinação do comportamento hidrodinâmico. Os valores de NTIS calculados usando simulações de CFD foram 5,55 e 4,76, para as taxas de fluxo A e B, respectivamente. Para a análise experimental, os valores de NTIS foram 6,67 e 5,54, para as taxas de fluxo A e B, respectivamente. O teste U de Mann-Whitney foi realizado para confirmar a similaridade entre as simulações de CFD e os testes experimentais. Os resultados do teste U de Mann-Whitney não mostraram diferenças estatisticamente significativas entre as simulações de CFD e os dados experimentais. Pode-se concluir que as simulações de CFD são válidas e podem ser usadas para analisar o comportamento hidrodinâmico dos reatores UASB.
对一个小型 UASB 反应器进行了建模，以评估其流体动力学特性，并将 CFD 模拟结果与实验室规模的实验结果进行比较。模拟使用 Ansys® CFXTM 进行，有两种不同的流速：A) 26.68 和 B) 4.0 l d-1。反应器容积为 1.5 升，有效容积为 1.38 升。除 CFD 模拟外，还进行了实验和模拟示踪剂注入的流体力学测试。获得了停留时间分布（RTD）曲线，并使用串联水槽数（NTIS）模型来确定流体力学行为。使用 CFD 模拟计算出的 NTIS 值分别为 5.55 和 4.76（流速 A 和 B）。在实验分析中，流速 A 和 B 的 NTIS 值分别为 6.67 和 5.54。为确认 CFD 模拟和实验测试之间的相似性，进行了曼-惠特尼 U 检验。Mann-Whitney U 检验的结果表明，CFD 模拟结果与实验数据之间没有显著的统计学差异。由此可以得出结论，CFD 模拟是有效的，可用于分析 UASB 反应器的流体动力学行为。
{"title":"ESTUDO HIDRODINÂMICO DE REATOR UASB DE PEQUENA ESCALA POR DINÂMICA DE FLUIDO COMPUTACIONAL (CFD): SIMULAÇÃO E VALIDAÇÃO","authors":"Vinícius Carvalho Rocha, Andreza Nataline Simões, Carla Eloísa Diniz dos Santos, Eduardo Cleto Pires","doi":"10.15628/holos.2023.16400","DOIUrl":"https://doi.org/10.15628/holos.2023.16400","url":null,"abstract":"Um reator UASB em pequena escala foi modelado para avaliar seu comportamento hidrodinâmico e comparar simulações de CFD com resultados experimentais obtidos em escala de laboratório. Foram realizadas simulações usando o Ansys® CFXTM com duas taxas de fluxo diferentes: A) 26,68 e B) 4,0 l d-1. O volume do reator era de 1,5 litros, com um volume útil de 1,38 litros. Além das simulações de CFD, foram realizados testes hidrodinâmicos com injeção de traçador, tanto experimentalmente quanto nas simulações. Foram obtidas curvas de distribuição do tempo de residência (RTD) e o modelo de número de tanques em série (NTIS) foi usado para determinação do comportamento hidrodinâmico. Os valores de NTIS calculados usando simulações de CFD foram 5,55 e 4,76, para as taxas de fluxo A e B, respectivamente. Para a análise experimental, os valores de NTIS foram 6,67 e 5,54, para as taxas de fluxo A e B, respectivamente. O teste U de Mann-Whitney foi realizado para confirmar a similaridade entre as simulações de CFD e os testes experimentais. Os resultados do teste U de Mann-Whitney não mostraram diferenças estatisticamente significativas entre as simulações de CFD e os dados experimentais. Pode-se concluir que as simulações de CFD são válidas e podem ser usadas para analisar o comportamento hidrodinâmico dos reatores UASB.","PeriodicalId":13167,"journal":{"name":"Holos","volume":null,"pages":null},"PeriodicalIF":0.1,"publicationDate":"2023-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138995012","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-12-18DOI: 10.15628/holos.2023.16340
Vinícius de Azevedo Silva, Mateus Peixoto Oliveira, Francisco Lledo dos Santos
Precipitation forecasting is essential for sectors such as water resources management and urban planning. In this study, a deep learning model was developed to predict rainfall in Brazilian cities, focusing on the municipality of Barra Mansa, Rio de Janeiro. Four neural network architectures were tested: FCN, Resnet, ResCNN and InceptionTime. Among them, FCN stood out significantly, presenting the lowest error rates and the best overall adjustment. The study highlights the ability of deep learning, especially through the FCN (Fully Convolutional Network - Segmented) architecture, to make accurate predictions and uncover hidden rainfall patterns. Such discoveries have great potential to improve rainfall forecasting systems and assist in decision-making in areas that require accurate climate information.
{"title":"MONTHLY RAINFALL FORECAST IN THE MUNICIPALITY OF BARRA MANSA/RJ USING DEEP LEARNING TIME SERIES TECHNIQUES","authors":"Vinícius de Azevedo Silva, Mateus Peixoto Oliveira, Francisco Lledo dos Santos","doi":"10.15628/holos.2023.16340","DOIUrl":"https://doi.org/10.15628/holos.2023.16340","url":null,"abstract":"Precipitation forecasting is essential for sectors such as water resources management and urban planning. In this study, a deep learning model was developed to predict rainfall in Brazilian cities, focusing on the municipality of Barra Mansa, Rio de Janeiro. Four neural network architectures were tested: FCN, Resnet, ResCNN and InceptionTime. Among them, FCN stood out significantly, presenting the lowest error rates and the best overall adjustment. The study highlights the ability of deep learning, especially through the FCN (Fully Convolutional Network - Segmented) architecture, to make accurate predictions and uncover hidden rainfall patterns. Such discoveries have great potential to improve rainfall forecasting systems and assist in decision-making in areas that require accurate climate information.","PeriodicalId":13167,"journal":{"name":"Holos","volume":null,"pages":null},"PeriodicalIF":0.1,"publicationDate":"2023-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139175914","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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