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Marcelo Zaiat - One of the best experts on this subject based on the ideXlab platform.
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Removal kinetics of sulfamethazine and its transformation products formed during treatment using a horizontal flow-anaerobic Immobilized Biomass bioreactor.
Journal of hazardous materials, 2018Co-Authors: Cristiane Arruda Oliveira, Marcelo Zaiat, Eduardo D Penteado, Ines N Tomita, Álvaro J. Santos-neto, Bianca Ferreira Da Silva, Paulo GomesAbstract:Abstract Sulfamethazine (SMZ) is an antibiotic from sulfonamides class widely used in veterinary medicine and reported in wastewater and sewage. Thus, it is essential to study technologies to reduce SMZ present in the aquatic environment. Anaerobic bioreactors are a low-cost technology applied for wastewater treatment. The objective of this paper is to study kinetics parameters related to SMZ removal using a horizontal flow-anaerobic Immobilized Biomass reactor (HAIB) and to evaluate its transformation products formed during this treatment. The bioreactor was operated at mesophilic condition with a hydraulic retention time of 12 h. The removal of SMZ was evaluated at three different concentrations: 200 ng L−1 (phase I), 400 ng l −1 (phase II) and 600 ng L−1 (phase III). The apparent first-order removal constant obtained for chemical oxygen demand was 0.885 ± 0.094 h−1 while SMZ showed a removal constant of 0.356 h−1. SMZ was removed with an efficiency of 56.0 ± 13.0 % (phase I); 62.0 ± 12.0 % (phase II) and 62.0 ± 6.00 % (phase III). Seven transformation products were detected and one of these with m/z 233 is reported for the first-time. The HAIB bioreactor has a potential to assist in wastewater treatment to remove contaminants at ng L-1 concentration level.
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removal of the veterinary antimicrobial sulfamethazine in a horizontal flow anaerobic Immobilized Biomass haib reactor subjected to step changes in the applied organic loading rate
Journal of Environmental Management, 2017Co-Authors: G H D Oliveira, Alvaro J Santosneto, Marcelo ZaiatAbstract:Abstract A bench-scale horizontal-flow anaerobic Immobilized Biomass (HAIB) reactor treating synthetic swine wastewater was operated under different applied organic loading rates (OLR) through both variations in feed strength and in hydraulic retention time (HRT). The influence of step changes in OLR on the removal of the veterinary antimicrobial sulfamethazine (SMZ) was assessed. The highest observed SMZ removal efficiency, 75 ± 6%, was achieved with an OLR of 2.7 ± 0.4 kg O2 m−3 d−1 when a significant increase in COD removal rate was observed. The SMZ removal rate was positively correlated (r = 0.899) to the COD removal rate in all of the experimental conditions in which the HRT was kept at 24 h, indicating a cometabolic transformation of the antimicrobial. Decreasing the HRT caused a significant decrease in SMZ removal efficiency without affecting the HAIB reactor performance in terms of stability, COD removal or metabolic intermediates production. Functionally equivalent steady states were observed in four different operational phases with similar operating conditions but with widely different behavior in relation to SMZ removal. The experimental results showed the potential of anaerobic technology in removing environmentally relevant concentrations of SMZ, and the possibility of enhancing reactor performance by controlling operating conditions.
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application of horizontal flow anaerobic Immobilized Biomass reactor for bioremediation of acid mine drainage
Journal of Water and Health, 2016Co-Authors: Renata Piacentini Rodriguez, M B A Varesche, Daniele Vital Vich, Marcelo Loureiro Garcia, Marcelo ZaiatAbstract:The production of low-pH effluent with sulfate and metals is one of the biggest environmental concerns in the mining industry. The biological process for sulfate reduction has the potential to become a low-cost solution that enables the recovery of interesting compounds. The present study analyzed such a process in a horizontal-flow anaerobic Immobilized Biomass (HAIB) reactor, employing ethanol as the carbon and energy source. Results showed that a maximal efficiency in the removal of sulfate and ethanol could only be obtained by reducing the applied sulfate load (225.1 ± 38 g m(-3) d(-1)). This strategy led to over 75% of chemical oxygen demand (COD) and sulfate removal. Among the COD/SO4(2-) studied ratios, 0.67 showed the most promising performance. The effluent's pH has naturally remained between 6.8 and 7.0 and the complete oxidation of the organic matter has been observed. Corrections of the influent pH or effluent recirculation did not show any significant effect on the COD and sulfate removal efficiency. Species closely related to strains of Clostridium sp. and species of Acidaminobacter hydrogenomorfans and Fusibacter paucivorans that can be related to the process of sulfate reduction were found in the HAIB reactors when the initial pH was 5 and the COD/SO4(2-) ratio increased to 1.0.
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hydrodynamic study of a horizontal flow anaerobic Immobilized Biomass reactor radial porosity and velocity distribution of wastewater flow
Chemical Engineering Research & Design, 2016Co-Authors: Betânia Hoss Lunelli, G H D Oliveira, Marcelo ZaiatAbstract:Abstract In this work, a mathematical model based on an extended Brinkman equation was used to evaluate the porosity and velocity distribution along the radial direction of a horizontal-flow anaerobic Immobilized Biomass (HAIB) reactor; the model considers the fluid flow within the bed. The study was performed using two different particle geometries and three tube-to-particle diameter ratios (D/dp) to understand the effects of the shape and particle size on the flow velocity distribution. The results show that the oscillation in the velocity profile is dependent on the D/dp ratio, particle shape and bed porosity. Better results were obtained with irregular shapes, such as hollow cylindrical rings, and a D/dp ratio of 10. The model adapted for this study may be a suitable tool for the design and optimization of horizontal-flow anaerobic Immobilized Biomass reactors used in wastewater treatment processes.
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sulfamethoxazole and ciprofloxacin removal using a horizontal flow anaerobic Immobilized Biomass reactor
Environmental Technology, 2016Co-Authors: Sami Chatila, Alvaro J Santosneto, Maura Roquete Amparo, Lucas S Carvalho, Eduardo D Penteado, Ines N Tomita, Paulo Gomes, Marcelo ZaiatAbstract:ABSTRACTThe antibiotics sulfamethoxazole (SMTX) and ciprofloxacin (CIP) are commonly used in human and veterinary medicine, which explains their occurrence in wastewater. Anaerobic reactors are low-cost, simple and suitable technology to wastewater treatment, but there is a lack of studies related to the removal efficiency of antibiotics. To overcome this knowledge gap, the objective of this study was to evaluate the removal kinetics of SMTX and CIP using a horizontal-flow anaerobic Immobilized Biomass reactor. Two different concentrations were evaluated, for SMTX 20 and 40 μg L−1; for CIP 2.0 and 5.0 μg L−1. The affluent and effluent analysis was carried out in liquid chromatography/tandem mass spectrometry (LC-MS/MS) with the sample preparation procedure using an off-line solid-phase extraction. This method was developed, validated and successfully applied for monitoring the affluent and effluent samples. The removal efficiency found for both antibiotics at the two concentrations studied was 97%. Chemic...
Eugenio Foresti - One of the best experts on this subject based on the ideXlab platform.
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horizontal flow anaerobic Immobilized Biomass haib reactor for organic matter and sulfate removal from paper recycling plant wastewater with simultaneous conversion of sulfide into elemental sulfur
Journal of environmental chemical engineering, 2018Co-Authors: Marcia Helena Rissato Zamariolli Damianovic, Leandro Augusto Gouvea De Godoi, Flavia Talarico Saia, Eugenio ForestiAbstract:Abstract Recycling helps reduce organic matter and sulfur content in effluents from the paper industry, as well as minimize large volumes usually generated, making the anaerobic process a feasible alternative to treat such waste. The objective of this paper is to evaluate simultaneous sulfate and organic matter removal in a bench-scale horizontal-flow anaerobic Immobilized Biomass (HAIB) reactor continuously fed with diluted wastewater from a full paper recycling plant. The reactor was filled with wood charcoal matrices containing Immobilized anaerobic sludge. The tested wastewater contained Chemical Oxygen Demand (COD) of 1745 mg L−1 and concentrations of sulfate ranging from 220 (phase 1) to 585 mg L−1 (phase 2). The anaerobic process from paper recycling effluent was followed by partial oxidation of sulfide to elemental sulfur. Sulfate reduction, methanogenesis and effluent desulfurization occurred in the same reactor and were spatially segregated by the plug-flow regime. The investigated HAIB reactor anaerobically removed organic matter and sulfate at high removal efficiencies (>90%), converting about 30% of the inconvenient dissolved sulfide to elemental sulfur. Therefore, integrated sulfate reduction and elemental sulfur production, as presented herein, can be considered an attractive component for sustainable wastewater treatment.
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Long-term operation of anaerobic Immobilized Biomass reactor treating organic wastewater containing sulfate
Journal of Water Process Engineering, 2016Co-Authors: Marcia Helena Rissato Zamariolli Damianovic, Leandro Augusto Gouvea De Godoi, Flavia Talarico Saia, Eugenio ForestiAbstract:Abstract This work evaluates the long-term performance (888 days) of a horizontal-flow anaerobic Immobilized Biomass (HAIB) reactor fed with synthetic wastewater containing organic matter and sulfate. The HAIB reactor achieved stable performance, exhibiting high sulfate and organic matter removal efficiencies subjected to organic matter concentration (expressed as chemical oxygen demand – COD) of 1500 mg/L and sulfate of 500 mg/L. Sulfate removal efficiency close to 100% was obtained for COD/sulfate ratios equal to or higher than 2.6, decreasing to ∼80% for COD/sulfate ratio of 1.4. Sulfidogenesis was clearly dependent on the availability of electron donor; but not methanogenesis. The smaller COD removal efficiencies (∼93%) were observed at the higher sulfate (1980 mg/L) and organic matter (COD of 7000 mg/L) concentrations, with COD/sulfate ratio of 3.5. Under these conditions, the presence of volatile fatty acids in the effluent indicates the occurrence of methanogenesis inhibition probably due to sulfide. The fixed-film HAIB reactor did not present bed clogging throughout the entire long-term operation period, thereby leading the way to new perspectives to use the efficient treatment of sulfate-rich wastewater.
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BTEX removal in a horizontal-flow anaerobic Immobilized Biomass reactor under denitrifying conditions
Biodegradation, 2013Co-Authors: Rogers Ribeiro, Eugenio Foresti, Ivana Ribeiro Nardi, Bruna Soares Fernandes, Marcelo ZaiatAbstract:Because benzene, toluene, ethylbenzene, and xylenes (BTEX) and ethanol are important contaminants present in Brazilian gasoline, it is essential to develop technology that can be used in the bioremediation of gasoline-contaminated aquifers. This paper evaluates the performance of a horizontal-flow anaerobic Immobilized Biomass (HAIB) reactor fed with water containing gasoline constituents under denitrifying conditions. Two HAIB reactors filled with polyurethane foam matrices (5 mm cubes, 23 kg/m^3 density and 95 % porosity) for Biomass attachment were assayed. The reactor fed with synthetic substrate containing protein, carbohydrates, sodium bicarbonate and BTEX solution in ethanol, at an Hydraulic retention time (HRT) of 13.5 h, presented hydrocarbon removal efficiencies of 99 % at the following initial concentrations: benzene 6.7 mg/L, toluene 4.9 mg/L, m -xylene and p -xylene 7.2 mg/L, ethylbenzene 3.7 mg/L, and nitrate 60 mg N/L. The HAIB reactor fed with gasoline-contaminated water at an HRT of 20 h showed hydrocarbon removal efficiencies of 96 % at the following initial concentrations: benzene, 4.9 mg/L; toluene, 7.2 mg/L; m -xylene, 3.7 mg/L; and nitrate 400 mg N/L. Microbiological observations along the length of the HAIB reactor fed with gasoline-contaminated water confirmed that in the first segment of the reactor, denitrifying metabolism predominated, whereas from the first sampling port on, the metabolism observed was predominantly methanogenic.
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Solution of a heterogeneous modeling of a horizontal-flow anaerobic Immobilized Biomass (HAIB) reactor by the sequencing method
Canadian Journal of Civil Engineering, 2011Co-Authors: Maressa Fabiano Cuel, Marcelo Zaiat, Wu Hong Kwong, Eugenio ForestiAbstract:A modeling study was completed to develop a methodology that combines the sequencing and finite difference methods for the simulation of a heterogeneous model of a tubular reactor applied in the treatment of wastewater. The system included a liquid phase (convection-diffusion-transport) and a solid phase (diffusion reaction) that was obtained by complet- ing a mass balance in the reactor and in the particle, respectively. The model was solved using a pilot-scale horizontal-flow anaerobic Immobilized Biomass (HAIB) reactor to treat domestic sewage, with the concentration results compared with the experimental data. A comparison of the behavior of the liquid phase concentration profile and the experimental results indi- cated that both the numerical methods offer a good description of the behavior of the concentration along the reactor. The advantage of the sequencing method over the finite difference method is that it is easier to apply and requires less computa- tional time to model the dynamic simulation of outlet response of HAIB.
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Pentachlorophenol (PCP) dechlorination in horizontal-flow anaerobic Immobilized Biomass (HAIB) reactors.
Bioresource technology, 2009Co-Authors: Marcia Helena Rissato Zamariolli Damianovic, Marcelo Zaiat, Elizabeth De Mattos Moraes, Eugenio ForestiAbstract:Abstract This study verifies the potential applicability of horizontal-flow anaerobic Immobilized Biomass (HAIB) reactors to pentachlorophenol (PCP) dechlorination. Two bench-scale HAIB reactors (R1 and R2) were filled with cubic polyurethane foam matrices containing Immobilized anaerobic sludge. The reactors were then continuously fed with synthetic wastewater consisting of PCP, glucose, acetic acid, and formic acid as co-substrates for PCP anaerobic degradation. Before being Immobilized in polyurethane foam matrices, the Biomass was exposed to wastewater containing PCP in reactors fed at a semi-continuous rate of 2.0 μg PCP g−1 VS. The applied PCP loading rate was increased from 0.05 to 2.59 mg PCP l−1 day−1 for R1, and from 0.06 to 4.15 mg PCP l−1 day−1 for R2. The organic loading rates (OLR) were 1.1 and 1.7 kg COD m−3 day−1 at hydraulic retention times (HRT) of 24 h for R1 and 18 h for R2. Under such conditions, chemical oxygen demand (COD) removal efficiencies of up to 98% were achieved in the HAIB reactors. Both reactors exhibited the ability to remove 97% of the loaded PCP. Dichlorophenol (DCP) was the primary chlorophenol detected in the effluent. The adsorption of PCP and metabolites formed during PCP degradation in the packed bed was negligible for PCP removal efficiency.
Maria Bernadete Amancio Varesche - One of the best experts on this subject based on the ideXlab platform.
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Continuous Anaerobic Treatment of the Aqueous Phase of Hydrothermal Liquefaction from Spirulina Using a Horizontal-Flow Anaerobic Immobilized Biomass (HAIB) Reactor
Water Air & Soil Pollution, 2021Co-Authors: Beatriz Egerland Bueno, Diana Quispe-arpasi, Laís Américo Soares, Isabel Kimiko Sakamoto, Maria Bernadete Amancio Varesche, Rogers Ribeiro, Giovana TommasoAbstract:Anaerobic digestion is a possibility for post-hydrothermal liquefaction wastewater (PHWW) treatment because this wastewater is rich in nutrients and organic compounds. However, the PHWW presents many toxic compounds. A strategy for the anaerobic treatment of toxic compounds is using Biomass adhered to inert supports forming biofilms, which can offer more resistance to the microorganism and protection from such compounds. The continuous treatment of PHWW is the essential key to obtaining a sustainable hydrothermal liquefaction process. In this work, the use of Immobilized Biomass was evaluated for the anaerobic degradation of PHWW from Spirulina in batch assays and continuous treatment. Higher methane production potential and volatile fatty acid mass balance showed the advantages of using Biomass Immobilized in polyurethane foam. Continuous treatment in a horizontal-flow anaerobic Immobilized Biomass (HAIB) reactor reached chemical organic demand (COD) removal efficiencies of 67% and 58% for volumetric organic load rates of 0.8 and 1.6 g COD.L^−1.d^−1, respectively. After 200 days of continuous treatment, Anaerobaculum and Coprothermobacter , fermentative proteolytic genera of bacteria with potential for hydrogen production, were favored.
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evaluation of the microbial diversity in a horizontal flow anaerobic Immobilized Biomass reactor treating linear alkylbenzene sulfonate
Biodegradation, 2008Co-Authors: Iolanda Cristina Silveira Duarte, Lorena Lima De Oliveira, Nora Katia Saavedra, Fabiana Fantinattigarboggini, Valeria Maia De Oliveira, Maria Bernadete Amancio VarescheAbstract:The purpose of this work was to assess the degradation of linear alkylbenzene sulfonate (LAS) in a horizontal-flow anaerobic Immobilized Biomass (HAIB) reactor. The reactor was filled with polyurethane foam where the sludge from a sanitary sewage treatment was Immobilized. The hydraulic detention time (HDT) used in the experiments was of 12 h. The reactor was fed with synthetic substrate (410 mg l−1 of meat extract, 115 mg l−1 of starch, 80 mg l−1 of saccharose, 320 mg l−1 of sodium bicarbonate and 5 ml l−1 of salt solution) in the following stages of operation: SI—synthetic substrate, SII—synthetic substrate with 7 mg l−1 of LAS, SIII—synthetic substrate with 14 mg l−1 of LAS and SIV—synthetic substrate containing yeast extract (substituting meat extract) and 14 mg l−1 of LAS, without starch. At the end of the experiment (313 days) a degradation of ∼35% of LAS was achieved. The higher the concentration of LAS, the greater the amount of foam for its adsorption. This is necessary because the isotherm of LAS adsorption in the foam is linear for the studied concentrations (2 to 50 mg l−1). Microscopic analyses of the biofilm revealed diverse microbial morphologies, while Denaturing Gradient Gel Eletrophoresis (DGGE) profiling showed variations in the population of total bacteria and sulphate-reducing bacteria (SRB). The 16S rRNA gene sequencing and phylogenetic analyses revealed that the members of the order Clostridiales were the major components of the bacterial community in the last reactor operation step.
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performance of a reactor containing denitrifying Immobilized Biomass in removing ethanol and aromatic hydrocarbons btex in a short operating period
Journal of Hazardous Materials, 2007Co-Authors: Valquiria Ribeiro Gusmao, Isabel Kimiko Sakamoto, Fabio Alexandre Chinalia, Maria Bernadete Amancio VarescheAbstract:Abstract A horizontal-flow anaerobic Immobilized Biomass reactor (HAIB) containing denitrifying Biomass was evaluated with respect to its ability to remove, separately and in a short operating period (30 days), organic matter, nitrate, and the hydrocarbons benzene (41.4 mg L−1), toluene (27.8 mg L−1), ethylbenzene (31.1 mg L−1), o-xylene (28.5 mg L−1), m-xylene (28.4 mg L−1) and p-xylene (32.1 mg L−1). The purified culture, which was grown in the presence of the specific hydrocarbon, was used as the source of cells to be Immobilized in the polyurethane foam. After 30 days of operation, the foam was removed and a new Immobilized Biomass was grown in the presence of another hydrocarbon. The average hydrocarbon removal efficiency attained was 97%. The organic matter, especially ethanol, was removed with an average efficiency of 83% at a mean influent concentration of 1185.0 mg L−1. A concomitant removal of 97% of nitrate was observed for a mean influent concentration of 423.4 mg L−1. The independent removal of each hydrocarbon demonstrated that these contaminants can be biodegraded separately, without the need for a compound to be the primary substrate for the degradation of another. This study proposes the application of the system for treatment of areas contaminated with these compounds, with substitution and formation of a biofilm in a 30-day period.
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Remoção de etanol e benzeno em reator anaeróbio horizontal de leito fixo na presença de sulfato
Engenharia Sanitaria e Ambiental, 2007Co-Authors: E B M Cattony, Marcelo Zaiat, Rogers Ribeiro, Eugenio Foresti, Maria Bernadete Amancio VarescheAbstract:In this study it is reported the operation of a horizontal-flow anaerobic Immobilized Biomass (HAIB) reactor under sulfate-reducing condition which was also exposed to different amounts of ethanol and benzene. The HAIB reactor comprised of an Immobilized Biomass on polyurethane foam and ferrous and sodium sulfate solutions were used (91 and 550 mg.l-1, respectively), to promote a sulfate-reducing environment. Benzene was added at an initial concentration of 2.0 mg.l-1 followed by an increased to 9 e 10 mg.l-1, respectively. Ethanol was added at an initial concentration of 170 mg.l-1 followed by an increased range of 960 mg.l-1. The reactor was operated at 30 (± 2) oC with hydraulic detention time of 12 h. Organic matter removal efficiency of 90% with a maximum benzene degradation rate of 0.07 mg benzene.mg-1VSS.d-1. Thus, this work corroborate the data obtained for Cattony et al (2005) and also demonstrate that compact units of HAIB reactors, under sulfate reducing conditions, are a potential alternative for in situ aromatic compounds bioremediation.
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btex and ethanol removal in horizontal flow anaerobic Immobilized Biomass reactor under denitrifying condition
Process Biochemistry, 2006Co-Authors: Valquiria Ribeiro Gusmao, Isabel Kimiko Sakamoto, Fabio Alexandre Chinalia, Tiago Henrique Martins, Otavio Henriquethiemann, Maria Bernadete Amancio VarescheAbstract:Abstract A denitrifying consortium was used as inoculum to form a biofilm in horizontal-flow anaerobic Immobilized Biomass reactor. The reactor was fed with hydrocarbons, separately (benzene at 13.8, 15.4 and 26.5 mg/L; toluene 30.8 mg/L; ethylbenzene 33.3 mg/L; xylene 32.1 mg/L), and also with a benzene, toluene, ethylbenzene and xylene (BTEX) mix solution of approximately 5.0 mg/L of each hydrocarbon. The hydrocarbons were dissolved in a solution containing ethanol. Organic matter removal efficiencies were of 95% with benzene and toluene amendments and about 76% with ethylbenzene, m-xylene and the BTEX-mix amendments. Hydrocarbons removal efficiencies were of 99% at an initial concentration of benzene 26.5 mg/L, toluene 30.8 mg/L, m-xylene 32.1 mg/L, ethylbenzene 33.3 mg/L and BTEX 26.5 mg/L. Microbial diversity assessed by a small portion of 16S DNA suggested the predominance of species related to the phylotypes Pseudomonas, Paracoccus and Bacteroides. This system showed to be an alternative to treating wastewater contaminated with nitrate, ethanol and hydrocarbons.
Syed Hadi Hasan - One of the best experts on this subject based on the ideXlab platform.
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Biosorptive Abatement of Cd2+ by Water Using Immobilized Biomass of Arthrobacter sp.: Response Surface Methodological Approach
Industrial & Engineering Chemistry Research, 2011Co-Authors: Syed Hadi Hasan, Preeti SrivastavaAbstract:The present study deals with the successful utilization of bacterial biosorbent Arthrobacter sp. for the removal of Cd(II) ion from water in a batch and a continuous system. The maximum uptake capacity of free and Immobilized Biomass in batch system was 270.27 and 188.67 mg/g, respectively. The maximum removal percentage Cd 2+ of 88.9% was obtained at flow rate of 1.0 mL/min and 19 cm bed height in the column system. The bed depth service time (BDST) model was applied, which was found to be in good agreement with the experimental data with high correlation coefficient (>0.997) and low chi-square value (>1.62). Thomas and Yoon-Nelson models were also applied to the experimental data, and the Yoon-Nelson model provided a better description of experimental kinetic data in comparison to the Thomas model. Column regeneration studies were also carried out using 0.1 mol/L HCl as desorbent for seven sorption-desorption cycles. Furthermore, an attempt has been made to optimize the process conditions for the maximum removal using the central composite design, and the result predicted by optimization plots was 89.64%, which is close to the experimental data, that is, 88.9% at the same process conditions.
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biosorption of lead using Immobilized aeromonas hydrophila Biomass in up flow column system factorial design for process optimization
Journal of Hazardous Materials, 2010Co-Authors: Syed Hadi Hasan, Pramod K. Srivastava, Mahe TalatAbstract:Abstract Free and Immobilized Biomass of Aeromonas hydrophila has been utilized for the removal of Pb(II) from aqueous solution. Fitness of Langmuir sorption model to the sorption data indicated the sorption was monolayer and uptake capacity of Biomass was 163.9 and 138.88 mg/g for the free and Immobilized Biomass respectively. 85.38% Pb(II) removal was achieved at bed height of 19 cm and flow rate of 2 mL/min and BDST model was in a good agreement with the experimental results (r2 > 0.997). An attempt has been made to optimize the process conditions for the maximum removal using Central Composite Design with the help of Minitab® 15 software and the result predicted by optimization plots was 88.27% which is close to the experimental data i.e. 85.38%. Sorption–desorption studies revealed that polysulfone Immobilized Biomass could reused up to 16 cycles and bed was completely exhaust after 33 cycles.
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Batch and continuous biosorption of Cu2+ by Immobilized Biomass of Arthrobacter sp.
Journal of environmental management, 2009Co-Authors: Syed Hadi Hasan, Preeti SrivastavaAbstract:The ability of free and polysulphone Immobilized Biomass of Arthrobacter sp. to remove Cu(2+) ions from aqueous solution was studied in batch and continuous systems. The Langmuir and Freundlich isotherm models were applied to the data. The Langmuir isotherm model was found to fit the sorption data indicating that sorption was monolayer and uptake capacity (Q(o)) was 175.87 and 158.7mg/g for free and Immobilized Biomass respectively at pH 5.0 and 30 degrees C temperature, which was also confirmed by a high correlation coefficient, a low RMSE and a low Chi-square value. A kinetic study was carried out with pseudo-first-order reaction and pseudo-second-order reaction equations and it was found that the Cu(2+) uptake process followed the pseudo-second-order rate expression. The diffusivity of Cu(2+) on Immobilized beads increased (0.402x10(-4) to 0.435x10(-4)cm(2)/s) with increasing concentration from 50 to 150mg/L. The maximum percentage Cu(2+) removal (89.56%) and uptake (32.64mg/g) were found at 3.5mL/min and 20cm bed height. In addition to this the Bed Depth Service Time (BDST) model was in good agreement with the experimental data with a high correlation coefficient (>0.995). Furthermore, sorption and desorption studies were also carried out which showed that polysulphone Immobilized Biomass could be reused for up to six sorption-desorption cycles.
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Biosorption of Cr(VI) from aqueous solution using A. hydrophila in up-flow column: optimization of process variables.
Applied microbiology and biotechnology, 2009Co-Authors: Syed Hadi Hasan, Pramod K. Srivastava, D. Ranjan, Mahe TalatAbstract:In the present study, continuous up-flow fixed-bed column study was carried out using Immobilized dead Biomass of Aeromonas hydrophila for the removal of Cr(VI) from aqueous solution. Different polymeric matrices were used to Immobilized Biomass and polysulfone-Immobilized Biomass has shown to give maximum removal. The sorption capacity of Immobilized Biomass for the removal of Cr(VI) evaluating the breakthrough curves obtained at different flow rate and bed height. A maximum of 78.58% Cr(VI) removal was obtained at bed height of 19 cm and flow rate of 2 mL/min. Bed depth service time model provides a good description of experimental results with high correlation coefficient (>0.996). An attempt has been made to investigate the individual as well as cumulative effect of the process variables and to optimize the process conditions for the maximum removal of chromium from water by two-level two-factor full-factorial central composite design with the help of Minitab ® version 15 statistical software. The predicted results are having a good agreement (R2 = 98.19%) with the result obtained. Sorption–desorption studies revealed that polysulfone-Immobilized Biomass could be reused up to 11 cycles and bed was completely exhausted after 28 cycles.
Cesar Pulgarin - One of the best experts on this subject based on the ideXlab platform.
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pre industrial scale combined solar photo fenton and Immobilized Biomass activated sludge biotreatment
Industrial & Engineering Chemistry Research, 2007Co-Authors: I Oller, Sixto Malato, J A Sanchezperez, M I Maldonado, W Gernjak, L A Perezestrada, J A Munoz, C Ramos, Cesar PulgarinAbstract:This paper reports on upscaling of a new technology combining solar photo-Fenton and aerobic biological processes to successfully treat a saline industrial wastewater containing around 600 mg L-1 of a non-biodegradable compound (α-methylphenylglycine, MPG) and dissolved organic carbon (DOC) of between 400 and 600 mg L-1. Pilot-plant tests were used in designing this demonstration hybrid solar photocatalytic-biological plant with a 4 m3 daily treatment capacity. It consists of a solar photo-Fenton reactor with 100 m2 of solar compound parabolic collectors (CPCs) and an aerobic biological treatment plant based on an Immobilized-Biomass activated-sludge reactor (1 m3). The catalyst concentration was Fe2+ = 20 mg L-1. The overall efficiency in the combined system was around 95% mineralization. 50% of the initial DOC was degraded in the photo-Fenton pretreatment, and 45% was removed in the aerobic biological treatment.
