scholarly journals Degradation of 2,4-dinitrophenol by Aspergillus niger AN 400 in batch reactors with immobilized biomass

2021 ◽  
Vol 8 (18) ◽  
pp. 623-634
Author(s):  
Renata Barros Silveira Brasil ◽  
Bárbara Chaves Aguiar Barbosa ◽  
Kelly Rodrigues ◽  
Glória Marinho
Keyword(s):  
Aspergillus Niger ◽  
Sequencing Batch Reactor ◽  
Batch Reactor ◽  
Reaction Times ◽  
Batch Reactors ◽  
Order Model ◽  
Nitrogen Fractions ◽  
First Order ◽  
Immobilized Biomass ◽  
Two Stages

Aspergillus niger AN 400 was tested in the treatment of a synthetic water containing 2,4-dinitrophenol (2,4-DNP) by operating batch reactors with immobilized biomass. The treatment was carried out in two stages: 1) accomplished growth of fungal inoculum Aspergillus niger AN 400, and 2) the biomass was immobilized on a support at a concentration of 2 x 106 mL-1 of spores. The reaction times (RT) were 168, 48, 24 and, 8 h. The variables analyzed were COD, pH and nitrogen fractions. Decay temporal (RT168 h) of 2,4-DNP and COD adjusted to the first-order model. The higher removal efficiency 2,4 DNP was 96% and COD was 83%. There was a decrease of sequencing batch reactor SBR efficiency when RT were 8 h. The use of Aspergillus niger AN 400 may be an alternative treatment of wastewater containing nitrophenolic compounds.

scholarly journals A Novel Approach of Bioesters Synthesis through Different Technologies by Highlighting the Lowest Energetic Consumption One

Polymers ◽  
2021 ◽  
Vol 13 (23) ◽  
pp. 4190
Author(s):  
Simona Popa ◽  
Andra Tamas ◽  
Vasile Simulescu ◽  
Dorin Jurcau ◽  
Sorina Boran ◽  
...  
Keyword(s):  
Fatty Acids ◽  
Energy Consumption ◽  
Bubble Column ◽  
Batch Reactor ◽  
Reaction Times ◽  
Fatty Acid Esters ◽  
Bubble Column Reactor ◽  
Batch Reactors ◽  
Novel Approach ◽  
Microwave Reactors

Fatty acids esters have a wide application as bioplasticizers and biolubricants in different industries, obtained mainly in classic batch reactors, through an equilibrium complex reaction, that involves high temperatures, long reaction times, vigorously stirring, and much energy consumption. To overcome these shortcomings, we synthesized a series of fatty acid esters (soybean oil fatty acids being the acid components with various hydroxyl compounds) through novel low energy consumption technologies using a bubble column reactor, a microwave field reactor and for comparison meaning, a classic batch reactor. The obtained bioesters physicochemical properties were similar to one another, a good concordance among their rheological properties was obtained, but the energetic consumption is lower when using the bubble column or the microwave reactors instead of the classical batch reactor.

scholarly journals Thermodynamics and kinetics of thermal deactivation of catalase Aspergillus niger

2020 ◽  
Vol 22 (2) ◽  
pp. 67-72
Author(s):  
Justyna Miłek
Keyword(s):  
Aspergillus Niger ◽  
Life Time ◽  
Economic Feasibility ◽  
Thermal Deactivation ◽  
Order Model ◽  
First Order ◽  
Thermodynamics And Kinetics ◽  
Different Temperatures ◽  
Kinetics Of ◽  
Thermal Stability Of

AbstractThe thermal stability of enzyme-based biosensors is crucial in economic feasibility. In this study, thermal deactivation profiles of catalase Aspergillus niger were obtained at different temperatures in the range of 35°C to 70°C. It has been shown that the thermal deactivation of catalase Aspergillus niger follows the first-order model. The half-life time t1/2 of catalase Aspergillus niger at pH 7.0 and the temperature of 35°C and 70°C were 197 h and 1.3 h respectively. Additionally, t1/2 of catalase Aspergillus niger at the temperature of 5°C was calculated 58 months. Thermodynamic parameters the change in enthalpy ΔH*, the change in entropy ΔS* and the change Gibbs free energy ΔG* for the deactivation of catalase at different temperatures in the range of 35°C to 70°C were estimated. Catalase Aspergillus niger is predisposed to be used in biosensors by thermodynamics parameters obtained.

scholarly journals Effect of temperatures and alternating anoxic/oxic sequencing batch reactor (SBR) operating modes on extracellular polymeric substances in activated sludge

2020 ◽  
Author(s):  
Hongwei Sun ◽  
Chenjian Cai ◽  
Jixue Chen ◽  
Chunyu Liu ◽  
Guangjie Wang ◽  
...  
Keyword(s):  
Activated Sludge ◽  
Extracellular Polymeric Substances ◽  
Sequencing Batch Reactor ◽  
Batch Reactor ◽  
Batch Reactors ◽  
Sequencing Batch Reactors ◽  
Operating Modes ◽  
Nitrification Process ◽  
Main Component ◽  
Denitrification Process

Abstract In order to investigate the effect of temperatures and operating modes on extracellular polymeric substances (EPS) contents, three sequencing batch reactors (SBRs) were operated at temperatures of 15, 25, and 35 °C (R15 °C, R25 °C, and R35 °C, respectively), with two SBRs operated under alternating anoxic/oxic conditions (RA/O and RO/A, respectively). Results showed that higher contents of tightly bound EPS (TB-EPS) and total EPS appeared in R15 °C, while loosely bound EPS (LB-EPS) dominated in R35 °C. In all three kinds of EPS (LB-EPS, TB-EPS and total EPS) assessed, protein was the main component in R15 °C and R25 °C, while polysaccharides dominated in R35 °C. Moreover, compared with RO/A, RA/O was favorable for the production of the three kinds of EPS. Furthermore, three kinds of EPS and their components were augmented during the nitrification process, while they declined during the denitrification process under all conditions except for R35 °C.

Effects of Different Thiobacillus on Bioleaching of Heavy Metals of Sewage Sludge in a Sequencing Batch Reactor

2013 ◽  
Vol 807-809 ◽  
pp. 1445-1450
Author(s):  
Jun Zhang ◽  
Hui Ping Yang ◽  
Dun Qiu Wang ◽  
Zheng Shi Zhang
Keyword(s):  
Heavy Metals ◽  
Ferrous Sulfate ◽  
Sequencing Batch Reactor ◽  
Loss Rate ◽  
Removal Rate ◽  
Batch Reactor ◽  
Acidithiobacillus Thiooxidans ◽  
Batch Reactors ◽  
Sequencing Batch Reactors ◽  
Average Loss

A bioleaching experiment was carried out in two sequencing batch reactors (SBR) of 80 L. Acidithiobacillus thiooxidans (A. t) and Acidithiobacillus ferrooxidans (A. f) were enrichment cultured by adding sulfur powder and ferrous sulfate as substrate respectively. Sequential batch leaching ran for three periods in succession. The average removal rate of As, Cd, Cr, Cu, Ni, Pb, Zn was 90.46%, 90.28%, 90.70% and 79.70%, 81.19%, 84.52% respectively. The average loss rate of total nutrient (total account of organic matter, TN, TP and TK) is 35.36%, 33.36% and 35.54% for three runs in sequence. Comparing with A. f, the acidification time of A. t is shortened by 3.0, 6.6 and 4.9 d, with the increase of 13.5 %, 11.2% and 7.3% for the removal rate of heavy metals.

Substrate Removal Mechanism for Sequencing Batch Reactors

1986 ◽  
Vol 18 (6) ◽  
pp. 21-33 ◽  
Author(s):  
D. Orhon ◽  
Y. Cimşit ◽  
O. Tünay
Keyword(s):  
Biological Treatment ◽  
Sequencing Batch Reactor ◽  
Batch Reactor ◽  
Batch Reactors ◽  
Sequencing Batch Reactors ◽  
Removal Mechanism ◽  
Factors Affecting ◽  
Substrate Removal ◽  
Reactor Types ◽  
The Many

All factors affecting substrate removal in sequencing batch reactor types of biological treatment systems should be fully explored to benefit from the many flexibilities of operation they offer. In this paper, a growth limited model is proposed for this purpose and verified by experimental observations. Interpretation of the results enabled a broader description of the process. It also indicated a number of interesting issues requiring further exploration.

Influence of agitation rate on the performance of a stirred anaerobic sequencing batch reactor containing immobilized biomass

2001 ◽  
Vol 44 (4) ◽  
pp. 305-312 ◽  
Author(s):  
S. M. Ratusznei ◽  
J. A.D. Rodrigues ◽  
E. F.M. Camargo ◽  
M. Zaiat ◽  
W. Borzani
Keyword(s):  
Sequencing Batch Reactor ◽  
Batch Reactor ◽  
Domestic Wastewater ◽  
Agitation Rate ◽  
Order Kinetic ◽  
Mechanical Agitation ◽  
Anaerobic Sequencing Batch Reactor ◽  
Substrate Removal ◽  
Order Kinetic Model ◽  
Immobilized Biomass

The present work reports on the influence of the mechanical agitation rates on the performance of a stirred anaerobic sequencing batch reactor containing immobilized biomass on polyurethane foam, as inert support, treating synthetic domestic wastewater. The reactor was operated at 30°C and an 8-hour cycle was used to treat approximately 0.5 L of the synthetic substrate with a COD concentration of nearly 500 mg/L. The studied agitation rates ranged from no agitation to 750 rpm. The system attained non-filtered substrate removal efficiency greater than 83% when agitation was employed. A very short start-up period and good solid retention could be observed. The use of agitation increased the efficiency of the reactor and enabled reduction of the total cycle time. An empirical equation and a first-order kinetic model are proposed to analyze the influence of agitation rates on the reactor's performance.

Comparison of Biocenoses from Continuous and Sequencing Batch Reactors

1992 ◽  
Vol 25 (6) ◽  
pp. 239-249 ◽  
Author(s):  
J. Wanner
Keyword(s):  
Activated Sludge ◽  
Nutrient Removal ◽  
Continuous Flow ◽  
Sequencing Batch Reactor ◽  
Flow System ◽  
Batch Reactor ◽  
Continuous Reactor ◽  
Batch Reactors ◽  
Sequencing Batch Reactors ◽  
Filamentous Microorganisms

Sequencing batch reactors (SBR) are often used for research on nutrient removal systems. A model anaerobic-oxic SBR was compared with a compartmentalized continuous-flow system. The levels of COD, phosphorus, and nitrogen removal in both systems were comparable but the biocenoses differed significantly. The SVI values of activated sludge from the continuous reactor ranged between 100 and 200 ml/g although no significant occurrence of filamentous microorganisms was observed. The sequencing batch reactor produced activated sludge with the SVIs below 100 ml/g and with high settling velocities. Filamentous microorganisms were frequently observed in the biocenosis of the SBR. The differences in settling properties and filamentous growth in both reactors are discussed and explained.

The effect of upflow air velocity on the structure of aerobic granules cultivated in a sequencing batch reactor

2004 ◽  
Vol 49 (11-12) ◽  
pp. 35-40 ◽  
Author(s):  
J.H. Tay ◽  
Q.S. Liu ◽  
Y. Liu
Keyword(s):  
Shear Force ◽  
Sequencing Batch Reactor ◽  
Batch Reactor ◽  
Granular Sludge ◽  
Batch Reactors ◽  
Aerobic Granules ◽  
Sequencing Batch Reactors ◽  
Air Velocity ◽  
Hydrodynamic Shear ◽  
Biomass Retention

The effect of upflow air velocity on the formation and structure of aerobic granules was studied in three column sequencing batch reactors. Upflow aeration would be the major cause of hydrodynamic shear force in the column reactor. Results showed that high upflow air velocity resulted in more compact, denser, rounder, stronger and smaller aerobic granules, while high biomass retention in the reactor was achieved. It was found that high upflow air velocity could induce granular sludge to secrete more cell polysaccharides which in turn contributed to the compact and strong structure. It appears from this study that the structure of aerobic granules could be controlled by manipulating the upflow air velocity.

scholarly journals Analyzing building materials and their properties in connection with the theory of experiment planning

2018 ◽  
Vol 196 ◽  
pp. 04009
Author(s):  
Tatiana Dormidontova ◽  
Anastasiya Filatova
Keyword(s):  
Building Materials ◽  
Experiment Planning ◽  
Future Planning ◽  
Order Model ◽  
First Order ◽  
Screening Experiments ◽  
Approximate Dependence ◽  
Number Of Publications ◽  
Two Stages ◽  
Economic Considerations

The task of planning an experiment can be divided into two stages: screening experiments conducting, step-by-step experiments performed on complete factorial design or on fractional replicates. As the number of publications on the practical use of plans-experiments in construction is insufficient, the paper presents appropriate recommendations in common form. Screening experiments are usually conducted with the aim of approximate orientation among many factors and for more precise future planning. These experiments can be carried out on the minimum fractional replicates making it possible to obtain the first order model. After obtaining the model, the factors that are included in it are appropriately ranked. Using the results of ranking, researchers take into account economic considerations, leave away unimportant factors and conduct experiments with remaining factors to obtain a mathematical model of the process. In order to find out the nomenclature of these factors, screening experiments are carried out. These experiments are performed to obtain an approximate dependence between the outcome of the process and the factors. This dependence is used to determine the influence that each of the factors has on the experience result. When the crucial factors are considered, it is possible to plan the basic experiment.

Creating anoxic and microaerobic conditions in sequencing batch reactors treating volatile BTX compounds

2001 ◽  
Vol 43 (3) ◽  
pp. 275-282 ◽  
Author(s):  
G. Ma ◽  
N. G. Love
Keyword(s):  
Sequencing Batch Reactor ◽  
Batch Reactor ◽  
Batch Reactors ◽  
Sequencing Batch Reactors ◽  
Reactor Configuration ◽  
Oxygen Conditions ◽  
Benzene Toluene ◽  
Xylene Isomers ◽  
Laboratory Reactor ◽  
Microaerobic Conditions

An experimental strategy is introduced for studying the biodegradation of wastewaters containing volatile contaminants using an alternating anoxic/microaerobic sequencing batch reactor (SBR). Benzene, toluene, and the xylene isomers (BTX) served as model volatile contaminants for this study. The reactor was configured to overcome stripping the volatile BTX compounds into the atmosphere to provide opportunities for BTX biodegradation. Oxygen-free anoxic and microaerobic (< 0.2 mg/L dissolved oxygen) conditions were established using a novel laboratory reactor configuration. ORP was successfully used to monitor different electron acceptor conditions in the SBR. Toluene and m-xylene were amenable to anoxic (denitrifying) metabolism while benzene, o-, and p-xylene were biodegradable under microaerobic conditions. The results demonstrate that establishing microaerobic conditions in full-scale bioreactors may be an appropriate way to encourage the biodegradation of aerobically biodegradable volatile contaminants. Additionally, the laboratory reactor configuration introduced in this paper may be useful in subsequent studies involving microaerobic metabolism.

Sign in / Sign up

Export Citation Format

Share Document