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5 results on '"Silva, Gustavo H. R. da"'

1. Long-Term Anaerobic Structured Fixed-Bed Reactor Operation for Domestic Sewage Treatment: Performance and Metal Dynamics.

Author

Silva, Julliana Alves da, Braga, Adriana F. M., Quartaroli, Larissa, Fermoso, Fernando G., Zaiat, Marcelo, and Silva, Gustavo H. R. da

Subjects
FIXED bed reactors, SEWAGE purification, ANAEROBIC digestion, CHEMICAL oxygen demand, TRACE metals
Abstract

To achieve optimal performance, anaerobic digestion (AD) requires well-balanced operation conditions, steady physical–chemical conditions, and adequate nutrient concentrations. The use of anaerobic structured-bed reactor (ASTBR) presents these conditions. However, several additional investigations are required to elucidate robustness to treat domestic sewage (DS). This pioneering study investigated the performance of an ASTBR in treating DS across four decreasing hydraulic retention times (HRTs) (12, 8, 6, and 5 h). The study aimed to assess organic matter removal, the influence on physical–chemical parameters, and the monitoring of trace metals (TMs) during long-term operation (614 days). Overall, the results underscore the viability of employing ASTBR for DS treatment, achieving an average chemical oxygen demand (COD) removal efficiency of 70%. The system demonstrated consistent long-term operation over 614 days, maintaining stability even with decreasing hydraulic retention times (HRTs). The average effluent concentration of volatile fatty acids (VFAs) was 20.4 ± 3.3 mg L−1, with a pH value averaging 7.2 ± 0.1. TM concentrations at an HRT of 12 h exhibited higher levels in the effluent compared to the influent, gradually decreasing over the course of operation and ultimately stabilizing at levels similar to those observed in the influent. The concentrations of metals, including Ba, Cr, Fe, Mn, Ni, Pb, Se, and Zn, monitored in the effluent samples adhered to the allowable discharge thresholds as stipulated by Brazilian regulations. [ABSTRACT FROM AUTHOR]

Published
2024
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3. Screening of trace metal supplementation for black water anaerobic digestion

Author

Conselho Nacional de Desenvolvimento Científico e Tecnológico (Brasil), Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (Brasil), Fundação de Amparo à Pesquisa do Estado de São Paulo, Braga, Adriana F. M., Pereira, María Beatriz O. C., Zaiat, Marcelo, Silva, Gustavo H. R. da, Fermoso, Fernando G., Conselho Nacional de Desenvolvimento Científico e Tecnológico (Brasil), Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (Brasil), Fundação de Amparo à Pesquisa do Estado de São Paulo, Braga, Adriana F. M., Pereira, María Beatriz O. C., Zaiat, Marcelo, Silva, Gustavo H. R. da, and Fermoso, Fernando G.

Abstract

Community on-site separation of wastewater is a treatment approach that leads to more efficient processes. Black water has high organic matter content and can be a suitable feedstock for anaerobic treatment systems. Biological methane production (BMP) tests were conducted using Plackett-Burman design to screen the effects of adding Fe, Ni, Cu, Co, Mn, Ba and Se, with simulated black water (SBW) as the substrate. In the inoculum, most metals were found mainly in the organic matter/sulfide and residual fractions except for Mn, which was present at 12.3% in the bioavailable fractions (exchangeable and carbonates), and Ba, which was evenly distributed among all the fractions. Ba had a significant negative effect on methane production and Mn addition enhanced the toxic effect. A specific methanogenic activity (SMA) between 18% and 27% lower than the control, was predicted at a total Ba concentration of approximately 1000-1200 mg L-1. Similar SMA was predicted at Ba concentration between 400 and 600 mg L-1 when 0.55 mg L-1 of Mn is added. Se and Cu additions demonstrate the potential to improve the methane production from SBW. The SMA was predicted to reach 12 mLCH4 gCOD-1 d-1 when Cu and Se are supplied at total concentrations of 3.0 mg L-1 and 0.98 mg L-1, respectively.

Published
2017

4. Reator compartimentado anaeróbio/aeróbio: sistema de baixo custo para tratamento de esgotos de pequenas comunidades

Author

Silva, Gustavo H. R. da and Nour, Edson A. A.

Subjects
anaerobic/aerobic process, reator compartimentado, processo anaeróbio/aeróbio, sistema de baixo custo, baffled reactor, low cost systems, rural communities, comunidades rurais
Abstract

No Brasil são conhecidas e usadas várias técnicas de tratamento de esgoto, desde os mais sofisticados sistemas de tratamento aos mais simples processos. Uma alternativa economicamente viável aos sistemas de tratamento de esgotos sanitários é o processo anaeróbio, o qual tem recebido especial atenção nas pesquisas desenvolvidas no País, notadamente os reatores anaeróbios de alta taxa, unidades compactas e com boa eficiência de tratamento. Dentre as alternativas tecnológicas capazes de proporcionar as referidas variações das condições ambientais necessárias à ocorrência dos processos, está o uso de reatores compartimentados anaeróbio/aeróbio. Este trabalho apresenta, como alternativa, um reator compartimentado anaeróbio/aeróbio, tratando esgoto sanitário, como possibilidade de ser utilizado em pequenas comunidades urbanas e rurais. O desempenho do sistema foi avaliado em diversos tempos de detenção hidráulica (TDH), nos quais os melhores valores de Demanda Química de Oxigênio Total (DQOtotal) - 73,7% e Sólidos em Suspensão Totais (SST) - 78,8%, foram obtidos com TDHtotal de 8 horas (4 horas para a fase anaeróbia e 4 horas para a fase aeróbia). O reator compartimentado apresentou a característica de estabilidade operacional necessária aos sistemas de baixo custo. Several techniques of sewage treatment, from the most sophisticated to the simplest processes, are known in Brazil. An economically viable alternative for the systems of treatment of sanitary sewage is the anaerobic process, which has been given special attention in Brazilian research programs, mainly in the field of high rate anaerobic reactors as they are compact units and have high efficiency. The use of baffled anaerobic/aerobic reactors is one technological solution to provide the necessary variations in environmental conditions to foster the processes mentioned. In this paper an alternative is presented in the form of a baffled anaerobic/aerobic reactor to treat sanitary sewage in small urban and rural communities. The system performance was evaluated at several hydraulic detention times (HDT). The best values of chemical oxygen demand (CODtotal) - 73.7% and total suspended solids (TSS) removal - 78.8% were obtained for HDTtotal of 8 h (4 h for the anaerobic phase and 4 h for the aerobic phase). The baffled reactor presented good operational stability, a necessary feature of low cost systems.

Published
2005

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