Biogas from confectionery wastewater with the application of ultrasound pre-treatment

Rm, Nivedha Ramanathan; Balasubramanian, N.; Chithra, K.

doi:10.1080/15567036.2019.1649747

Cited by 4 publications

(4 citation statements)

References 54 publications

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“…As the sewage was rich in suspended solids, a relatively low removal of organic compounds could be attributed to their poor decomposition. According to Ramanathan et al [51], particulate organic material limited the hydrolysis stage of anaerobic digestion. Moreover, lipids, which are usually abundant in confectionery wastewater, may also be the cause.…”

Section: Resultsmentioning

confidence: 99%

Methane Production from Confectionery Wastewater Treated in the Anaerobic Labyrinth-Flow Bioreactor

et al. 2023

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Production and consumption of confectionery products have increased worldwide, thus, effective management of wastewater produced is now an important issue. The confectionery high-load sewage was explored for biogas production in an innovative-design anaerobic reactor with labyrinth flow. The experimental studies were focused on determining the best technological parameters of anaerobic digestion for the effective removal of pollutants and obtaining high CH4 production efficiency. It was found that organic loading rate (OLR) of 5.0–6.0 g COD/L·d contributed to the highest CH4 generation of 94.7 ± 6.1 to 97.1 ± 5.1 L CH4/d, which corresponded to a high COD removal of 75.4 ± 1.5 to 75.0 ± 0.6%. Under such conditions the FOS/TAC ratio was below 0.4, indicating reactor stability, and pH was on the level of 7.15 ± 0.04 at OLR 5.0 g COD/L·d and 7.04 ± 0.07 at OLR 6.0 g COD/L·d.

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Section: Resultsmentioning

confidence: 99%

Methane Production from Confectionery Wastewater Treated in the Anaerobic Labyrinth-Flow Bioreactor

et al. 2023

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“…In turn, other authors found that US enhanced biogas and methane production from the same wastewater only by 7% and 4%, respectively [45]. According to the literature, the application of ultrasound pretreatment had a positive effect on biogas yield from confectionery wastewater [46].…”

Section: Biogas Yield and Its Compositionmentioning

confidence: 96%

Evaluation of Anaerobic Digestion of Dairy Wastewater in an Innovative Multi-Section Horizontal Flow Reactor

et al. 2020

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The aim of this study was the performance evaluation of anaerobic digestion of dairy wastewater in a multi-section horizontal flow reactor (HFAR) equipped with microwave and ultrasonic generators to stimulate biochemical processes. The effects of increasing organic loading rate (OLR) ranging from 1.0 g chemical oxygen demand (COD)/L·d to 4.0 g COD/L·d on treatment performance, biogas production, and percentage of methane yield were determined. The highest organic compounds removals (about 85% as COD and total organic carbon—TOC) were obtained at OLR of 1.0–2.0 g COD/L·d. The highest biogas yield of 0.33 ± 0.03 L/g COD removed and methane content in biogas of 68.1 ± 5.8% were recorded at OLR of 1.0 g COD/L·d, while at OLR of 2.0 g COD/L·d it was 0.31 ± 0.02 L/COD removed and 66.3 ± 5.7%, respectively. Increasing of the OLR led to a reduction in biogas productivity as well as a decrease in methane content in biogas. The best technological effects were recorded in series with an operating mode of ultrasonic generators of 2 min work/28 min break. More intensive sonication reduced the efficiency of anaerobic digestion of dairy wastewater as well as biogas production. A low nutrient removal efficiency was observed in all tested series of the experiment, which ranged from 2.04 ± 0.38 to 4.59 ± 0.68% for phosphorus and from 9.67 ± 3.36 to 20.36 ± 0.32% for nitrogen. The effects obtained in the study (referring to the efficiency of wastewater treatment, biogas production, as well as to the results of economic analysis) proved that the HFAR can be competitive to existing industrial technologies for food wastewater treatment.

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“…The second important element is the scale of the work carried out. In studies carried out under optimised conditions on a laboratory scale, the results obtained are often very promising [10]. However, their proper verification can only take place during the long-term operation of pilot reactors, under conditions close to actual operating conditions and using real, non-synthetic wastewater [52].…”

Section: Organic Compounds Removalmentioning

confidence: 99%

“…The popularity of these types of solutions is also increasing because their properties integrate with the assumptions of global energy and climate policy [9]. The main argument in this case is the fact that the pollutants become a substrate for the production of energy, which accumulates in biogas, as well as become a source of other economically useful value-added products, especially fertilisers [10]. Therefore, anaerobic wastewater treatment methods fulfil the recycling and recovery postulates of a circular economy, supporting the achievement of the targets set in various energy and climate packages and supporting ambitious plans to reduce greenhouse gas emissions into the atmosphere [11].…”

Section: Introductionmentioning

confidence: 99%

Application of Recycled Filling to Improve the Purification Performance of Confectionery Wastewater in a Vertical Anaerobic Labyrinth Flow Bioreactor

Dębowski,

Kazimierowicz,

Ignaciuk

et al. 2024

Energies

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Anaerobic wastewater treatment is, in many cases, a justified alternative to typical activated sludge processes, from a technological, economic, and ecological point of view. The optimisation of fermentation reactors is primarily concerned with increasing the biodegradation of organic compounds and biogas production, as well as improving efficiency in the removal of nitrogen and phosphorus compounds. The aim of the research was to determine the impact of using low-cost recycled filling on the efficiency of treating real confectionery wastewater in a vertical anaerobic labyrinth flow bioreactor. The experiments focused on selecting the organic loading rate that would allow for the effective biodegradation and removal of pollutants, as well as the efficient production of biomethane. It was found that the tested reactor can operate efficiently at a maximum organic loading rate (OLR) of 7.0–8.0 g of chemical oxygen demand (COD)/L·d. In this OLR range, high efficiency was guaranteed for both wastewater treatment and biogas production. However, increasing the OLR value to 8.0 g COD/L·d had a significant negative effect on the methane (CH4) content in the biogas. The most efficient variants achieved a biodegradation efficiency of around 90% of the organic compounds, a CH4 content of over 70% in the biogas, and a biogas yield of over 400 L/kg of COD removed. A significant influence of the applied OLR on the ratio of free organic acids (FOS) to total alkaline capacity (TAC) and pH was observed, as well as a strong correlation of these indicators with the specific biogas yield and CH4 content. The application of a solution based on the use of a hybrid system of anaerobic granulated sludge and an anaerobic filter resulted in an efficient treatment process and an almost complete elimination of suspensions from the wastewater.

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Biogas from confectionery wastewater with the application of ultrasound pre-treatment

Cited by 4 publications

References 54 publications

Methane Production from Confectionery Wastewater Treated in the Anaerobic Labyrinth-Flow Bioreactor

Methane Production from Confectionery Wastewater Treated in the Anaerobic Labyrinth-Flow Bioreactor

Evaluation of Anaerobic Digestion of Dairy Wastewater in an Innovative Multi-Section Horizontal Flow Reactor

Application of Recycled Filling to Improve the Purification Performance of Confectionery Wastewater in a Vertical Anaerobic Labyrinth Flow Bioreactor

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