Avaliação das concentrações de metano gerado em um biorreator de bancada com base em parâmetros físico-químicos

Ferreira, Natalí Acioly de Luna; Aires, Kellianny Oliveira; Almeida, Márbara Vilar de Araújo; Melo, Márcio Camargo de; Monteiro, Veruschka Escarião Déssoles

doi:10.1590/s1413-41522017145766

Cited by 4 publications

(1 citation statement)

References 7 publications

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“…Variations in COD and VS concentrations are mainly due to variations in the farm management, influenced by the routine of washing the stalls, which can lead to manure dilutions. Hydraulic retention time, pH, and alkalinity can affect anaerobic biodigestion and, consequently, influence the percentage of methane in the biogas (Ferreira et al, 2017).…”

Section: Monitoring Of Biodigesters and Model Input Datamentioning

confidence: 99%

Mathematical Models for Estimating Methane Production in Covered Lagoon Biodigesters Treating Pig Manure

et al. 2021

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Covered lagoon biodigesters (CLB) have been widespread in Brazil in the treatment of pig manure. However, the quantification of biogas production in CLB using mathematical models is still limited and scarce. This study aimed to evaluate and compare six mathematical models-Chen-Hashimoto (Chen, 1983), CETESB (2006), COD Conversion (Chernicharo, 2016, IPCC (2006), Deng (Deng et al., 2014, and modified Stover-Kincannon (Yu et al., 1998)-usually used to estimate methane (CH4), and propose improvements to the models, if necessary. The results were compared with the monitored production (Pactual) in a farm with CLB using the t-test (α = 5%). The Chen-Hashimoto, IPCC, Deng, and modified Stover-Kincannon models showed no statistical difference compared to Pactual (405.0 m 3 CH4 d −1 ), whereas the CETESB and COD Conversion models presented no statistical difference after the proposed improvements. All models can be considered reliable for estimating volumetric methane production after the adaptations, being relevant tools for diagnosis and decision-making regarding the energy recovery of biogas with CLB operation in pig farms.

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Section: Monitoring Of Biodigesters and Model Input Datamentioning

confidence: 99%

Mathematical Models for Estimating Methane Production in Covered Lagoon Biodigesters Treating Pig Manure

et al. 2021

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Which kinetic model best fits the methane production on pig farms with covered lagoon digesters?

Lopes

Rosa

Borges

et al. 2021

Environmental Research and Technology

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The volumetric production of biogas can be estimated through kinetic models, although many of them have not been validated adequately in full-scale systems with specific operational conditions in tropical countries. This study aimed to evaluate the applicability of these kinetic models to estimate methane production in pig farming operated with covered lagoon digesters (CLD, to inform: Chen-Hashimoto, First-order, Cone, Modified Gompertz, Modified Stover-Kincannon and Deng. The input data were obtained through the monitoring of two CLD in pig farming located in Minas Gerais-Brazil. The analyzed parameters were methane composition, the temperature of the substrate, chemical oxygen demand (COD), and volatile solids. The real production of methane (Pactual) was determined in relation to the electric power production at the internal combustion engine. The results obtained for Pactual and the models were compared through regression analysis (t-test, α=1%). All of the evaluated models overestimate the methane production in comparison with Pactual. The smallest difference between the CH4 production and the measurement on the pig farm was obtained with Chen model, overestimating approximately 16.3%, while the highest estimate was 38.5% obtained with the Modified Stover-Kincannon model. The results showed the absence of statistical differences among the real data (monitored system) and the simulated data (p-value>0.01). The mathematical kinetic models are considered a reliable tool to evaluate the energetic potential of biogas in pig farming with CLD from operational simplicity and low cost.

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Análise do processo biodegradativo em resíduos sólidos urbanos aterrados

et al. 2020

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As dinâmicas envolvidas no processo de biodegradação dos resíduos sólidos urbanos (RSU) e na formação do biogás incluem diversos fatores físicos, químicos e microbiológicos. O objetivo deste artigo foi analisar a biodegradação de RSU aterrados em uma célula experimental. Os indicadores monitorados foram temperatura, umidade, pH, sólidos voláteis e quantificação dos micro-organismos aeróbios totais. O biogás foi mensurado por meio de um detector portátil que verificou as concentrações de CH4, CO2 e O2. Os dados foram submetidos à estatística descritiva e, em seguida, foi gerada uma matriz de correlação de Pearson com as variáveis envolvidas no processo. O monitoramento da célula experimental verificou que os diversos indicadores analisados foram propícios à degradação da matéria orgânica, embora a produção de biogás não tenha sido potencializada em termos de metano.

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Avaliação das concentrações de metano gerado em um biorreator de bancada com base em parâmetros físico-químicos

Cited by 4 publications

References 7 publications

Mathematical Models for Estimating Methane Production in Covered Lagoon Biodigesters Treating Pig Manure

Mathematical Models for Estimating Methane Production in Covered Lagoon Biodigesters Treating Pig Manure

Which kinetic model best fits the methane production on pig farms with covered lagoon digesters?

Análise do processo biodegradativo em resíduos sólidos urbanos aterrados

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