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Effects of the support material addition on the hydrodynamic behavior of an anaerobic expanded granular sludge bed reactor

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Journal of Environmental Sciences 2017年第4期29卷 224-230页

作者： Tania Pérez-Pérez Gleyce Teixeira Correia Wu Hong Kwong ilea.a.pereda-reyes Deny Oliva-Merencio Marcelo Zaiat Institute of Animal Science San Jose de las Lajas Mayabeque Cuba Department of Chemical Engineering Federal University of Sao Carlos Brazil Process Engineering Centre Instituto Superior Politecnico Jose Antonio Echeverria (Cujae) 11901 114 Street Marianao Havana Cuba Study Centre of Renevaable Energy Technologies Instituto Superior Politecnico rose Antonio Echeverria (Cujae) 11901 114 Street Marianao Havana Cuba Biological Processes Laboratory Center for Research Development and Innovation in Environmental Engineering Sao Carlos School of Engineering University of Sao Paulo Engenharia Ambiental - Bloco 4-F Av. Joao Dagnone 17.00 - Santa Angelina 13.563-120 Sao Carlos SP Brazil

As a support material, zeolite can be used to promote the granulation process due to its high settable property and the ability to retain biomass on its surface. The present paper reports on the influence of zeolite addition on the hydrodynamic behavior of an expanded granular sludge bed reactor（EGSB）. Different models were applied to fit the flow pattern and to compare EGSB hydrodynamic performance with and without the addition of zeolite. The experimental data fit the tanks in a series model for zeolite bed height of 5 cm and upflow velocity of 6 m/*** axial dispersion degree（D/uL） was obtained at lower heights of zeolite. The real hydraulic retention time（HRTr） was increased with both increased zeolite bed height and increased upflow velocity. The short-circuit results for 5 cm of zeolite bed and 6, 8 and 10 m/hr upflow velocity were 0.3, 0.24 and 0.19 respectively, demonstrating the feasibility of using zeolite for a proper hydrodynamic environment to operate the EGSB reactor. The presence of zeolite resulted in the higher percentage values of dead zones, ranging from 12% to 24%.Zeolite addition exerted a positive effect on the hydrodynamics pattern for this technology being advantageous for the anaerobic process because of its possible contribution to better biofilm agglomeration, granule formation and substrate-microorganism contact.

关键词： Anaerobic digestion Axial dispersion degree EGSB reactor Hydrodynamics Upflow velocity Zeolite

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A comparison of process performance during the anaerobic mono-and co-digestion of slaughterhouse waste through different operational modes

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Journal of Environmental Sciences 2018年第2期30卷 149-156页

作者： Jhosané Pagés-Díaz ilea.a.pereda-reyes Jose Luis Sanz Magnus Lundin Mohammad J.Taherzadeh Ilona Sárvári Horváth Process Engineering Centre (CIPRO) Universidad Tecnológica de La Habana "José Antonio Echeverría" (Technical University of Havana "José A. Echeverría") (Cujae) Swedish Centre for Resource Recovery University of Bor?s Department of Molecular Biology Autonomous University of Madrid

The use of consecutive feeding was applied to investigate the response of the microbial biomass to a second addition of substrates in terms of biodegradation using batch tests as a promising alternative to predict the behavior of the process. Anaerobic digestion（AD） of the slaughterhouse waste（SB） and its co-digestion with manure（M）, various crops（VC）, and municipal solid waste were evaluated. The results were then correlated to previous findings obtained by the authors for similar mixtures in batch and semi-continuous operation modes. AD of the SB failed showing total inhibition after a second feeding. Co-digestion of the SB ＋ M showed a significant improvement for all of the response variables investigated after the second feeding, while co-digestion of the SB ＋ VC resulted in a decline in all of these response variables. Similar patterns were previously detected, during both the batch and the semi-continuous modes.

关键词： Co-digestion Biomethane potential test Second feeding Specific methanogenic activity Slaughterhouse waste

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Mathematical Modeling of the Hydrodynamics of an EGSB Reactor

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Journal of Chemistry and Chemical Engineering 2014年第6期8卷 602-610页

作者： Gleyce Teixeira Correia Tania Pérez-Pérez ilea.a.pereda-reyes Deny Oliva Merencio Marcelo Zaiat Wu Hong Kwong Department of Chemical Engineering Federal University of Sao Carlos Sao Carlos 13565-905 Brazil Institute of Animal Science Mayabeque 32700 Cuba Study Center of Process Engineering Instituto Superior Politécnico "José Antonio Eeheverria " Havana 19390 Cuba Study Center of Renewable Energy Technologies lnstituto Superior Politécnico "José Antonio Echeverria " Havana 19390 Cuba Department of Hydraulic and Sanitation School of Engineering of Sao Carlos University of Sao Paulo Sao Carlos 13563-120 Brazil

Generally, in the literature, the hydrodynamic behavior of an EGSB （expanded granular sludge bed） reactor is considered as a complete mix reactor. Few works study in detail the flow of such reactors. The aim of this work was to study, in detail, the hydrodynamics of an EGSB reactor and to propose a mathematical model to describe its flow. A 3.04 L reactor was used with HRT （hydraulic retention time） of 12 h, affluent flowrate of 4 mL·min^-1, and the recirculation flow rate was changed to study three different upflow velocities in the tube （6, 8 and 10 m·h^-1. The pulse input method was used, with the use of blue dextran as tracer. In order to consider the dimensional differences between the tube and the separator, the reactor was divided into two regions （tube and separator）. Initially, a model with two tubular reactors with dispersion in series was proposed and the Peclet number was adjusted for the two regions. It was observed that the region of the tube shows the behavior of a tubular reactor with high dispersion, whereas the region of the separator shows the behavior of a complete mix reactor. In order to simplify the equation, and by knowing that the concentration profile along the reactor was almost constant, a model of two CSTRs （continuous stirred tank reactors） was proposed in series and the number of reactors （N） was set. The best combination was five CSTRs, three in the tube region and two in the separator region. The presented models were equivalent and can be used to describe the hydrodynamic behavior of the EGSB reactor.

关键词： EGSB reactor hydrodynamics mathematical modeling.

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