Degradation of acid orange 7 by a controlled anaerobic–aerobic sequencing batch reactor

2006 ◽  
Vol 54 (2) ◽  
pp. 187-192 ◽  
Author(s):  
G. Buitrón ◽  
K.M. Martínez ◽  
A. Vargas
Keyword(s):  
Organic Carbon ◽  
Azo Dye ◽  
Inflection Point ◽  
Sequencing Batch Reactor ◽  
Model Compound ◽  
Batch Reactor ◽  
Control Variable ◽  
Synthetic Wastewater ◽  
Acid Orange 7 ◽  
Acid Orange

The degradation of a mono azo dye in an automated and controlled anaerobic–aerobic sequencing batch reactor (SBR) is described in this work. The experiments were conducted with a synthetic wastewater containing acid orange 7 as the model compound to degrade and glucose as the co-substrate in a molar relationship 1:40 (substrate/co-substrate). It was possible to control the anaerobic and aerobic stages, using the redox potential (ORP) as the only control variable. The strategy detects an inflection point in the ORP signal, indicating the end of the reaction. The efficiency of removal of total organic carbon was between 85% and 90%. Azo dye was removed with 85% efficiency during the anaerobic stage.

Granular activated carbon-biofilm configured sequencing batch reactor treatment of C.I. Acid Orange 7

2008 ◽  
Vol 76 (1) ◽  
pp. 142-146 ◽  
Author(s):  
Soon-An Ong ◽  
Eiichi Toorisaka ◽  
Makoto Hirata ◽  
Tadashi Hano
Keyword(s):  
Activated Carbon ◽  
Sequencing Batch Reactor ◽  
Batch Reactor ◽  
Granular Activated Carbon ◽  
Acid Orange 7 ◽  
Acid Orange

Comparison between biological and chemical–physical treatment for colour removal

2004 ◽  
Vol 4 (5-6) ◽  
pp. 65-72
Author(s):  
G. Farabegoli ◽  
L. Pietrelli ◽  
E. Rolle ◽  
A. Sabene
Keyword(s):  
Azo Dye ◽  
Sequencing Batch Reactor ◽  
Batch Reactor ◽  
Textile Wastewater ◽  
Synthetic Wastewater ◽  
Physical Treatment ◽  
Colour Removal ◽  
Biological Reduction ◽  
Initial Concentration ◽  
Physical Treatments

The main aim of this research is to compare the efficiency of biological and chemical–physical treatments for the removal of organic azo dyes in the textile wastewater. Regarding the biological reduction of the wastewater colour the anaerobic/aerobic (ANA/AER) sequential step-treatment provides the best reductions in colour and COD. A lab-scale Sequencing Batch Reactor (SBR) fed with synthetic wastewater and mono-azo dye (at the initial concentration of 25 mg/l) was used achieving 84% colour reduction and 82% COD removal. Chemical–physical treatments were performed using the oxidative method with Fenton's reagent and adsorption on the activated carbon achieving respectively colour reduction over 90% (from the initial concentration of 250 mg/l) and 155 mg col/g GAC total adsorption capacity (from the initial concentration of 1 g/l).

Potential of nitrous oxide recovery from an aerobic/oxic/anoxic SBR process

2015 ◽  
Vol 73 (5) ◽  
pp. 1061-1066 ◽  
Author(s):  
Jianqiang Zhao ◽  
Nan Huang ◽  
Bo Hu ◽  
Luwei Jia ◽  
Guanghuan Ge
Keyword(s):  
Nitrous Oxide ◽  
Organic Carbon ◽  
Release Rate ◽  
Conversion Rate ◽  
Sequencing Batch Reactor ◽  
Batch Reactor ◽  
Operating Mode ◽  
Synthetic Wastewater ◽  
Total Production

A single sequencing batch reactor (SBR) with an operating mode of anaerobic/oxic/anoxic (A/O/A) was developed to determine a simpler process to recover nitrous oxide (N2O) from synthetic wastewater containing ammonia and glucose. This SBR system was initiated in A/O mode to implement nitritation (ammonia to nitrite) and then switched to A/O/A mode. Using measurements of the dissolved N2O concentration and release rate, the total production and conversion rate of N2O were calculated to reveal the potential of producing and recovering N2O in the extended anoxic phase. Results showed that the A/O/A SBR could convert the majority of the nitrite available in the system into N2O by heterotrophic denitritation over longer anoxic periods, and a conversion rate of 77% could be achieved. As a consequence, the A/O/A SBR presents potential ability to produce and recover N2O from wastewater containing ammonia and organic carbon.

Anaerobic/aerobic treatment of colorants present in textile effluents

2004 ◽  
Vol 50 (2) ◽  
pp. 149-155 ◽  
Author(s):  
R. Ma. Melgoza ◽  
A. Cruz ◽  
G. Buitrón
Keyword(s):  
Sequencing Batch Reactor ◽  
Model Compound ◽  
Batch Reactor ◽  
Textile Wastewater ◽  
Synthetic Wastewater ◽  
Aerobic Treatment ◽  
Produce Water ◽  
Real Wastewater ◽  
Initial Color ◽  
Reactive Azo Dyes

The operation of an anaerobic/aerobic process used to degrade the colorants present in textile wastewater is presented. The objective is to produce water that can be reused. Two particular cases were studied: the degradation of a synthetic wastewater containing the colorant disperse blue 79 (DB79) as a model compound and a real textile effluent containing reactive azo dyes. The biodegradation was achieved using a single tank operated as sequencing batch reactor. It was observed that the DB79 was biotransformed to amines in the anaerobic stage decolorizing the wastewater. The amines formed were subsequently mineralized in the aerobic phase. An increase of toxicity was observed in the anaerobic stage due to the amines formation, but the wastewater was detoxified after the aerobic treatment. Removal efficiencies of DB79 around 92% were observed after the treatment. Around 96% of the initial color of the real wastewater was effectively removed. It was observed that the biomass pre-acclimatized to the degradation of DB79 was more effective for the color removal than a freshly inoculum used.

Excess nitrogen accumulation in activated sludge in sequencing batch reactor with a single-stage oxic process

2009 ◽  
Vol 59 (3) ◽  
pp. 573-582 ◽  
Author(s):  
Xiao-ming Li ◽  
Dong-bo Wang ◽  
Qi Yang ◽  
Wei Zheng ◽  
Jian-bin Cao ◽  
...  
Keyword(s):  
Activated Sludge ◽  
Nitrogen Removal ◽  
Sequencing Batch Reactor ◽  
Ph Value ◽  
Batch Reactor ◽  
Nitrogen Loss ◽  
Single Stage ◽  
Synthetic Wastewater ◽  
Nitrogen Accumulation ◽  
Excess Nitrogen

It was occasionally found that a significant nitrogen loss in solution under neutral pH value in a sequencing batch reactor with a single-stage oxic process using synthetic wastewater, and then further studies were to verify the phenomenon of nitrogen loss and to investigate the pathway of nitrogen removal. The result showed that good performance of nitrogen removal was obtained in system. 0–7.28 mg L−1 ammonia, 0.08–0.38 mg L−1 nitrite and 0.94–2.12 mg L−1 nitrate were determined in effluent, respectively, when 29.85–35.65 mg L−1 ammonia was feeding as the sole nitrogen source in influent. Furthermore, a substantial nitrogen loss in solution (95% of nitrogen influent) coupled with a little gaseous nitrogen increase in off-gas (7% of nitrogen influent) was determined during a typical aerobic phase. In addition, about 322 mg nitrogen accumulation (84% of nitrogen influent) was detected in activated sludge. Based on nitrogen mass balance calculation, the unaccounted nitrogen fraction and the ratio of nitrogen accumulation in sludge/nitrogen loss in solution were 14.6 mg (3.7% of nitrogen influent) and 0.89, respectively. The facts indicated that the essential pathway of nitrogen loss in solution in this study was excess nitrogen accumulation in activated sludge.

scholarly journals Feasibility of a pulsed sequencing batch reactor with anaerobic aggregated biomass for the treatment of low strength wastewaters

1997 ◽  
Vol 35 (1) ◽  
pp. 193-198 ◽  
Author(s):  
A. G. Brito ◽  
A. C. Rodrigues ◽  
L. F. Melo
Keyword(s):  
Sequencing Batch Reactor ◽  
Batch Reactor ◽  
Anaerobic Bacteria ◽  
Synthetic Wastewater ◽  
Solid Contact ◽  
Transfer Resistance ◽  
Preliminary Study ◽  
Flow Turbulence ◽  
Low Strength ◽  
Swept Volume

This study concerns an assessment of a SBR operation that associates anaerobic aggregated biomass with a pulsed action during the reaction phase, a system named Pulsed Sequencing Batch Reactor (P-SBR). The system uses a diaphragm pump as a pulsator unit to increase the liquid-solid contact, in order to avoid dead zones and possible external mass transfer resistance. A preliminary study of the operation of the reactor was performed with a low strength synthetic wastewater with a COD near 1000 mg.1−1 and a sub-optimal temperature of 22°C. A removal efficiency of 60-70% was attained after 5 and 6 hours of reaction time. The respective organic loads were 5 – 6 kg COD.m−3. day−1, thus supporting the feasibility of the P-SBR system for wastewater treatment in such conditions. The results also indicate that a ratio of 1.8%o between the swept volume delivered by the pump and the reactor volume was adequate to promote a flow turbulence in the sludge blanket and that a redox potential of near −400 mV was readily created by anaerobic bacteria after the reactor filling step.

Performance Analysis of Azo Dye Decolorization by Immobilized Trametes versicolor in a Sequencing Batch Reactor

2018 ◽  
Vol 35 (12) ◽  
pp. 1322-1328
Author(s):  
Luis Enrique Lemus-Gómez ◽  
Maria Aurora Martínez-Trujillo ◽  
Isabel Membrillo-Venegas ◽  
Mayola García-Rivero
Keyword(s):  
Performance Analysis ◽  
Azo Dye ◽  
Trametes Versicolor ◽  
Sequencing Batch Reactor ◽  
Batch Reactor ◽  
Dye Decolorization ◽  
Azo Dye Decolorization

scholarly journals Performance of the anammox sequencing batch reactor treating synthetic and real landfill leachate

2018 ◽  
Vol 44 ◽  
pp. 00179 ◽  
Author(s):  
Mariusz Tomaszewski ◽  
Grzegorz Cema ◽  
Tomasz Twardowski ◽  
Aleksandra Ziembińska-Buczyńska
Keyword(s):  
Nitrogen Removal ◽  
Landfill Leachate ◽  
Sequencing Batch Reactor ◽  
Batch Reactor ◽  
Nitrogen Loading ◽  
Synthetic Wastewater ◽  
High Nitrogen ◽  
Removal Capacity ◽  
Anammox Activity ◽  
Anammox Process

The anaerobic ammonium oxidation (anammox) process is one of the most energy efficient and environmentally-friendly bioprocess for the treatment of the wastewater with high nitrogen concentration. The aim of this work was to study the influence of the high nitrogen loading rate (NLR) on the nitrogen removal in the laboratory-scale anammox sequencing batch reactor (SBR), during the shift from the synthetic wastewater to landfill leachate. In both cases with the increase of NLR from 0.5 to 1.1 – 1.2 kg N/m3d, the nitrogen removal rate (NRR) increases to about 1 kg N/m3d, but higher NLR caused substrates accumulation and affects anammox process efficiency. Maximum specific anammox activity was determined as 0.638 g N/g VSSd (NRR 1.023 kg N/m3d) and 0.594 g N/g VSSd (NRR 1.241 kg N/m3d) during synthetic and real wastewater treatment, respectively. Both values are similar and this is probably the nitrogen removal capacity of the used anammox biomass. This indicates, that landfill leachate did not influence the nitrogen removal capacity of the anammox process.

Efficient treatment of dairy processing wastewater in a laboratory scale Intermittently Aerated Sequencing Batch Reactor (IASBR)

2018 ◽  
Vol 85 (3) ◽  
pp. 379-383 ◽  
Author(s):  
Peter Leonard ◽  
Emma Tarpey ◽  
William Finnegan ◽  
Xinmin Zhan
Keyword(s):  
Wastewater Treatment ◽  
Retention Time ◽  
Wastewater Treatment Plant ◽  
Sequencing Batch Reactor ◽  
Batch Reactor ◽  
Treatment Plant ◽  
Laboratory Scale ◽  
Synthetic Wastewater ◽  
Operational Parameters ◽  
Dairy Processing

This Research Communication describes an investigation into the viability of an Intermittently Aerated Sequencing Batch Reactor (IASBR) for the treatment of dairy processing wastewater at laboratory-scale. A number of operational parameters have been varied and the effect has been monitored in order to determine optimal conditions for maximising removal efficiencies. These operational parameters include Hydraulic Retention Time (HRT), Solids Retention Time (SRT), aeration rate and cycle length. Real dairy processing wastewater and synthetic wastewater have been treated using three laboratory-scale IASBR units in a temperature controlled room. When the operational conditions were established, the units were seeded using sludge from a municipal wastewater treatment plant for the first experiment, and sludge from a dairy processing factory for the second and third experiment. In experiment three, the reactors were fed on real wastewater from the wastewater treatment plant at this dairy processing factory. These laboratory-scale systems will be used to demonstrate over time that the IASBR system is a consistent, viable option for treatment of dairy processing wastewater in this sector. In this study, the capacity of a biological system to remove both nitrogen and phosphorus within one reactor will be demonstrated. The initial operational parameters for a pilot-scale IASBR system will be derived from the results of the study.

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