An experimental determination of the H2S overall mass transfer coefficient from quiescent surfaces at wastewater treatment plants

Santos, Jane Méri; Kreim, Virginie; Guillot, Jean-Michel; Reis, Neyval Costa; Sá, Leandro Melo de; Horan, N. J.

doi:10.1016/j.atmosenv.2012.06.014

Cited by 45 publications

(37 citation statements)

References 20 publications

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“…O H2S é tóxico e apresenta odor agressivo, podendo impactar negativamente as pessoas que vivem nos arredores das estações de tratamento de esgoto (ETEs) (Chernicharo, 2007;Santos et al, 2012).…”

Section: Introductionunclassified

“…Em relação ao odor, o H2S pode ser percebido e até mesmo causar incômodo em baixas concentrações, da ordem de 0,655 µg m -3 (equivalente a 0,00047 ppm, a 25°C e 1 atm de pressão) (Tchobanoglous et al, 2003;Santos et al, 2012). Dessa forma, é fundamental realizar o monitoramento e o controle adequado do contaminante para minimizar o impacto à vizinhança das ETEs.…”

Section: Introductionunclassified

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Simulação numérica da dispersão do sulfeto de hidrogênio emitido por um reator UASB para tratamento de esgoto doméstico

Augusto¹,

Calheiros²,

Carvalho³

2017

Rev. ambiente água

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RESUMOO tratamento anaeróbio de águas residuárias pode produzir elevadas concentrações de sulfeto de hidrogênio (H2S), substância que apresenta forte odor, além de ser corrosivo e tóxico. Alguns dos métodos existentes para o controle do H2S demandam elevado custo de implantação e operação e, portanto, não são adotados. Dessa forma, o planejamento adequado da instalação de uma estação de tratamento de esgoto (ETE) pode auxiliar na prevenção do impacto e de possíveis problemas com a população. Modelos matemáticos de dispersão atmosférica podem ser aplicados previamente para verificar o alcance do poluente e, portanto, subsidiar a definição do local mais adequado para instalação de uma ETE. Dessa forma, o objetivo deste trabalho foi analisar a dispersão atmosférica do H2S proveniente de uma unidade anaeróbia de tratamento de águas residuárias localizada em um bairro rural do município de Itajubá, MG, Brasil. Para isso, foi aplicado o modelo gaussiano AERMOD utilizando-se dados reais da taxa de emissão do poluente no reator anaeróbio, além de informações meteorológicas e geofísicas (relevo e uso do solo). Como resultado das simulações verificou-se que a pluma de odor foi orientada pelo relevo e se concentrou nas proximidades da unidade de tratamento, limitando o impacto ao bairro rural. O vento também exerceu influência direta na orientação do H2S para o período 1. No entanto, para o período 2, não se verificou a mesma tendência. Dessa maneira, constatou-se que a análise de características meteorológicas (principalmente a direção predominante dos ventos) e geofísicas da região e a aplicação de modelos matemáticos podem auxiliar na escolha do local mais adequado para a instalação de uma ETE.Palavras-chave: AERMOD, dispersão atmosférica, H 2 S, odor.Numerical simulation of the dispersion of hydrogen sulphide emitted by a UASB reactor for domestic sewage treatment ABSTRACTThe anaerobic treatment of wastewaters can produce a large concentration of hydrogen sulfide (H2S), an odorant, toxic and corrosive substance. Control methods for eliminating H2S often require high implementation and operation costs and therefore are not used. Thus, suitable

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Section: Introductionunclassified

Simulação numérica da dispersão do sulfeto de hidrogênio emitido por um reator UASB para tratamento de esgoto doméstico

Augusto¹,

Calheiros²,

Carvalho³

2017

Rev. ambiente água

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show abstract

“…Water9 determines the mass transfer coefficient for the liquid phase with taking account of wind speed, fetchto-depth ratio, and molecular diffusivity of the chemical in the water or the Schmidt number for the liquid phase. Also, the mass transfer coefficient for the gas phase depends on the Schmidt number of the gas phase, wind speed, and the free surface area (Santos et al 2012).…”

Section: Estimation Of Voc Emission Ratesmentioning

confidence: 99%

“…In this study, EPA's Water9 model version 3, which is widely used in several studies (Santos et al 2012;Zhang 2010;Fatehifar et al 2008;Aneja et al 2006), was applied to estimate emission rates of STM and ACN from different operation units as indicated in Fig. 2.…”

Section: Estimation Of Voc Emission Ratesmentioning

confidence: 99%

Emission patterns of acrylonitrile and styrene around an industrial wastewater treatment plant in Iran

Benis

Shakerkhatibi

Yousefi

et al. 2016

Int. J. Environ. Sci. Technol.

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The uncontrolled releases of volatile organic compounds (VOCs) from wastewater treatment plants (WWTPs) have been highly concerned due to the associated public health risks. In petrochemical industries, WWTPs are responsible for various organic compound emissions into the atmosphere, which can considered as the main source of VOCs emission in such industries. The typical high-strength petrochemical wastewater is generated from an acrylonitrile-butadiene-styrene (ABS) resin manufacturing plant that usually needs pretreatment before discharging to the main WWTP. The objective of this study was to investigate the emissions and fates of acrylonitrile (ACN) and styrene (STM) through wastewater pretreatment units operated in an ABS manufacturing plant. In this study, the emission rates of ACN and STM were estimated by means of EPA's Water9 emission model. Subsequently, the emission rates were used as the input data of AERMOD model to simulate the atmospheric behaviors of emitted ACN and STM. The results of Water9 model showed that 57 and 81 % of influent ACN and STM are emitted to the air through pretreatment units, respectively. For both of them, the equalization basin had the major portion of emission to the atmosphere. The concentration distribution profiles of ACN and STM resulted from AERMOD model indicted that the concentration of STM was lower than EPA reference concentration (RfC); however, the higher concentration of ACN (higher than RfC) occurred near the WWTP as well as the neighbor ambient.

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“…Oviedo 14 studied concentration and distribution of hydrogen sulfide in sewer system. J M Santos 15 H 2 S respectively. Mi 17 , Peng 18 studied the accumulation of combustible gas in sewage in the mechanism, and the gas evaluation model of explosion risk of city sewers and septic tanks as well as the warning model of gas explosion are built.…”

Section: Introductionmentioning

confidence: 99%

CFD Analysis of Oxygen and Carbon Dioxide Recovery during Ventilation in Municipal Confined Space

Liu¹,

Tan²,

Liu³

2016

JRACR

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Confined space is a special working place. To ensure the safety, the forced ventilation must be carried out before entering the confined space. In this paper, ventilation process in municipal heating confine space is simulated by CFD numerical simulation method, and the distribution of temperature, oxygen and carbon dioxide in municipal heating confined space during ventilation process is studied. The simulation results show that the airflow and temperature are obviously stratified in vertical direction during the ventilation. The temperature is low and the airflow velocity is high at the bottom part of the tunnel. While the temperature is high and the airflow velocity is low at the top of the tunnel. By contrast, recovery of the oxygen and carbon dioxide content is relatively faster at the bottom than it at the top. When the ventilation volume flow rates are 6000 m 3 •h -1 , 8000 m 3 •h -1 ,10000 m 3 •h -1 , 12000 m 3 •h -1 , and 14000 m 3 •h -1 respectively, the time when the temperature reach stable and gas fraction return to normal are 45 minutes, 32 minutes, 22 minutes, 15 minutes, 10 minutes respectively.

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An experimental determination of the H2S overall mass transfer coefficient from quiescent surfaces at wastewater treatment plants

Cited by 45 publications

References 20 publications

Simulação numérica da dispersão do sulfeto de hidrogênio emitido por um reator UASB para tratamento de esgoto doméstico

Simulação numérica da dispersão do sulfeto de hidrogênio emitido por um reator UASB para tratamento de esgoto doméstico

Emission patterns of acrylonitrile and styrene around an industrial wastewater treatment plant in Iran

CFD Analysis of Oxygen and Carbon Dioxide Recovery during Ventilation in Municipal Confined Space

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