Effect of the Progressive Increase of Organic Loading Rate in an Anaerobic Sequencing Batch Reactor for Biodiesel Wastewater Treatment

Pereira, Erlon Lopes; Borges, Alisson Carraro; Silva, Greicelene Jesus da

doi:10.3390/w14020223

Cited by 10 publications

(4 citation statements)

References 26 publications

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“…The correlation analysis results between OLR and VS concentrations in both AHR and CSTR systems, with R 2 values of 0.56 and 0.90 respectively, are presented in Figs 5(a-b). These findings align with the studies conducted by Yilmaz et al 2012 and Pereira et al in 2022 [24,25].…”

Section: Vs Concentrationsupporting

confidence: 93%

Performance Comparison between Anaerobic Hybrid Reactor and Anaerobic Continuous Stirred-Tank Reactor for High-Strength Fresh Leachate Treatment

Sutthiprapa,

Towprayoon,

Chiemchaisri

et al. 2024

Pol. J. Environ. Stud.

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This study aimed to examine the performance of an anaerobic hybrid reactor (AHR) and an anaerobic continuous stirred tank reactor (CSTR) for treating high-strength fresh leachate. As the organic loading rate (OLR) was increased in both systems, the pH decreased, with the lowest pH corresponding to an OLR of 25-30 kgCOD/m 3 •d. The AHR system demonstrated instability in total volatile fatty acids when the OLR increased to 20 kgCOD/m 3 •d. The highest methane (CH4) content was achieved when the OLR was 15 kgCOD/m 3 •d. Moreover, the AHR showed excellent sediment retention. When the OLR increased, volatile suspended solids (VSS) in the system increased. The CH 4 content tended to increase as the OLR increased up to 20 kgCOD/m 3 •d. The highest CH 4 content in the AHR was 68%, which was higher than that of the CSTR. The CSTR could not produce biogas when the OLR was 20 kgCOD/m 3 •d. The optimal OLR for the operation of AHR and CSTR treating fresh leachate was found to be 15 and 10 kgCOD/m 3 •d respectively.

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Section: Vs Concentrationsupporting

confidence: 93%

Performance Comparison between Anaerobic Hybrid Reactor and Anaerobic Continuous Stirred-Tank Reactor for High-Strength Fresh Leachate Treatment

Sutthiprapa,

Towprayoon,

Chiemchaisri

et al. 2024

Pol. J. Environ. Stud.

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“…At an OLR higher than 4.0 kgCOD/m 3 •d, the COD removal efficiency was 75% with an HRT of 2 days. Increasing the OLR causes the volatile solids (VS) in the system to increase, which in turn increases the biomass in the system, as shown by Pereira and Yilmaz [44,45].…”

Section: Identifying the Optimum Olrmentioning

confidence: 99%

Optimizing an Anaerobic Hybrid Reactor Series for Effective High-Strength Fresh Leachate Treatment and Biogas Generation

Sutthiprapa,

Towprayoon,

Chiemchaisri

et al. 2024

Sustainability

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Treating high-strength fresh leachate is challenging and of great interest due to the inherent variability in its physical and chemical characteristics. This research aims to enhance the efficiency of the anaerobic hybrid reactor (AHR) series in treating high-strength fresh leachate and achieving biogas generation from fresh leachate at ambient temperatures. The AHR series used consists of two serially connected reactors termed the first anaerobic hybrid reactor (AHR-1) and the secondary anaerobic hybrid reactor (AHR-2). AHR-1 treated high-concentration fresh leachate with an organic loading rate (OLR) between 5 and 20 kgCOD/m3·d. AHR-2 treated the effluent from the first tank and removed organic matter from the system. The experiment was conducted for 210 days, showing that an OLR of 10 kgCOD/m3·d resulted in the most suitable COD removal efficiency, ranging from 82 to 91%. The most suitable OLR for biogas production was 15 kgCOD/m3·d. The AHR series proved to be an efficient system for treating high-strength fresh leachate and generating biogas, making it applicable to leachate treatment facilities at waste transfer stations and landfill sites. Treating leachate and utilizing it as a renewable energy source using the AHR series presents a practical and efficient waste management approach. High-strength leachate can be effectively treated with the AHR series; such methods may be integrated into industries treating leachates with high COD values.

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“…In addition, the results of the stoichiometry calculation showed that carbon removal via hydrolytic acidification could efficiently reduce 30-50% of greenhouse gas (CO 2 and methane) emission, which was beneficial to carbon emission reduction; however, it was difficult to accurately control the carbon degradation of low-strength mariculture wastewater at the stage of acidification, otherwise the produced VFAs were transferred to biogas [16]. Among the anaerobic processes, the anaerobic sequencing batch reactor (ASBR) offers advantages of continuous treatment, great process flexibility and lesser space needs [17] and is suitable for the treatment of mariculture wastewater.…”

Section: Introductionmentioning

confidence: 99%

The Control Strategy and Kinetics of VFAs Production in an ASBR Reactor Treating Low-Strength Mariculture Wastewater

Gao

Zhang

Sun

et al. 2022

IJERPH

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As an environment-friendly wastewater treatment process, the anaerobic fermentation process has been widely used for the pretreatment of high-strength wastewater. However, it is rarely applied to treat low-strength wastewater due to low methane recovery. In this study, anaerobic fermentation treating low-strength mariculture wastewater was studied in an anaerobic sequencing batch reactor (ASBR) with a COD removal rate of 75%. Anaerobic fermentation was successfully controlled at the acidification stage by increasing COD loading. As the greenhouse gas emission decreased, the residual organics were enough for biological nutrients’ removal. Fluorescence in situ hybridization results showed that the dominant bacteria in the ASBR were acidogenic bacteria and methanogens, accounting for 39.7% and 46.5% of the total bacteria, respectively. Through the calculation processing of the experimental data, the order of the anaerobic fermentation reaction was a second-order reaction. The kinetic parameters of low-strength organic wastewater treatment were determined by using the Grau second-order substrate removal model, Stover–Kincannon model, Monod model and Haldane model. The maximum rate removal constant Umax, sludge yield coefficient Y and inhibition constant Ki were 1.157 g/(L·d), 0.153 mgVSS/mgCOD and 670 mg/L, respectively. It provided data support for the practical application of the anaerobic fermentation treating low-strength wastewater.

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Effect of the Progressive Increase of Organic Loading Rate in an Anaerobic Sequencing Batch Reactor for Biodiesel Wastewater Treatment

Cited by 10 publications

References 26 publications

Performance Comparison between Anaerobic Hybrid Reactor and Anaerobic Continuous Stirred-Tank Reactor for High-Strength Fresh Leachate Treatment

Performance Comparison between Anaerobic Hybrid Reactor and Anaerobic Continuous Stirred-Tank Reactor for High-Strength Fresh Leachate Treatment

Optimizing an Anaerobic Hybrid Reactor Series for Effective High-Strength Fresh Leachate Treatment and Biogas Generation

The Control Strategy and Kinetics of VFAs Production in an ASBR Reactor Treating Low-Strength Mariculture Wastewater

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