Oxic settling anaerobic (OSA) process for excess sludge reduction: 16 months of management of a pilot plant fed with real wastewater

Vitanza, Rosa; Cortesi, Angelo; Arana-Sarabia, Maria E. De; Gallo, Vittorino; Vasiliadou, Ioanna A.

doi:10.1016/j.jwpe.2019.100902

Cited by 23 publications

(28 citation statements)

References 24 publications

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“…In regards to phosphorus removal, Chudoba et al [21] pointed out that phosphate removal in the OSA type system could not be expected to exceed 50%. At the same time, Vitanza et al [29] also found phosphorus removal at very low rate 5.1 % whereas [33] also reported phosphorus removal to be lower in A+OSA (33.6%) than in the control system (43.9%). Temperatures over 30°C also lowers the metabolic activity of PAO [38], therefore no PO4-P release was observed in the anaerobic reactor and PO4-P removal entirely due to the heterotrophic biomass synthesis resulted in poor removal efficiency close to 60% throughout experiments in the study carried out by [36].…”

Section: Carbon and Nutrient Removal Efficiency In The Osa Processmentioning

confidence: 93%

“…For instance, 35% of sludge reduction at the sludge age of 20 days was achieved by using real wastewater by reference [18] and his co-workers. Vitanza et al [29] evaluated 16 months of performance of an OSA pilot plant fed with real municipal wastewater. The observed yield varied between 0.112 and 0.465 gTSS/gCOD, showing that the excess sludge reduction due to the insertion of the sludge holding tank was 49.6 ± 20.7% compared to the conventional CAS system.…”

Section: The Potential Of the Osa Process In Terms Of Observed Sludge Yieldmentioning

confidence: 99%

“…However, studies on temperature effects on the OSA process are rare to find in literature. Most of the experimental studies regarding OSA process were operated under room temperature [22], [26], [28], [29], [35]. The recent study [36] explored the impact of temperature on sludge stabilization, where the OSA process was coupled with thermic treatment at moderate temperature (35°C) resulting in high sludge reduction (80%), as well as improving sludge settling properties.…”

Section: Temperaturementioning

confidence: 99%

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A review on promising strategy to decrease sludge production: Oxic-settling-anoxic/anaerobic process

Karlikanovaite-Balikci

Yağcı

2020

Environmental Research and Technology

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Recently, as environmental regulation for the removal of nutrients and excess sludge produced through wastewater treatment has become more restricted, many wastewater treatment plants face serious challenges in terms of waste production. Nowadays, the issue of excess sludge production has received considerable critical attention. Recent developments in sludge treatment technologies have heightened the need for more promising strategies to reduce sludge levels in a cost-effective and environmentally friendly manner. The purpose of this paper is to review recent research into the oxic-settling-anaerobic/anoxic (OSA) technology for sludge minimization. The OSA process is a modification of a conventional activated sludge system with the addition of interchange bioreactor parallel to recycled activated sludge line. The OSA process seems to be a revolutionary and cost-effective alternative for sludge reduction approach in the future. It is hoped that this research will contribute to a deeper understanding of the OSA process in terms of sludge reduction efficiency, carbon and nutrient removal, operational parameters, possible reduction mechanisms and microbial community changes after the implementation of the OSA system and applied in the treatment of real wastewater at full-scale.

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Section: Carbon and Nutrient Removal Efficiency In The Osa Processmentioning

confidence: 93%

Section: The Potential Of the Osa Process In Terms Of Observed Sludge Yieldmentioning

confidence: 99%

Section: Temperaturementioning

confidence: 99%

See 1 more Smart Citation

A review on promising strategy to decrease sludge production: Oxic-settling-anoxic/anaerobic process

Karlikanovaite-Balikci

Yağcı

2020

Environmental Research and Technology

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“…The excess sludge produced in wastewater treatment plants (WWTPs) is recognized as one of the most critical issues in the conventional activated sludge (CAS) process, both from an environmental and an economical point of view [1]. In an effort to minimize sludge yield, side-stream technologies have been developed, such as mechanical, physicochemical and biological methods.…”

Section: Introductionmentioning

confidence: 99%

“…This cyclic stress condition alters bacterial metabolism, leading to biomass reduction [3]. OSA is a cost-effective, in-situ process that does not have unfavorable effects on sludge settling properties and effluent quality and therefore has attracted several pilot and full-scale applications with the aim to reduce the excess sludge production [1,[3][4][5][6]. In recent years, the combination of the OSA process with other technologies capable of sludge volume reduction, such as thermal and mechanical treatment, was also studied [7,8].…”

Section: Introductionmentioning

confidence: 99%

Simulation of an Oxic-Settling-Anaerobic Pilot Plant Operated under Real Conditions Using the Activated Sludge Model No.2d

Vitanza

Cortesi

Gallo

et al. 2021

Water

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Oxic-settling-anaerobic (OSA) process has been introduced into the treatment line of wastewater in order to upgrade activated sludge processes and to reduce the production of excess sludge. The aim of the present study was to simulate the performance of an OSA pilot plant by implementing the Activated Sludge Model No.2d (ASM2d) into a mathematical modelling software (BioWin). The stepwise calibration, performed both by off-line experiments and software dynamic calibration, was carried out in a heuristic way, adjusting the parameters values that showed a major influence to the effluent and internal concentrations. All the reduction factors introduced into ASM2d to simulate the processes occurring in anoxic and anaerobic conditions were lowered in order to reproduce the concentrations of interest. In addition, the values of parameters of the PAOs (polyphosphate accumulating organisms)-related process (namely qPHA and YPO4) were found lower than those usually adopted. In general, theoretical results were in good agreement with the experimental data obtained from plant’s operation, showing an accurate predictive capacity of the model. Good performance was achieved considering the phosphorus removal related process, while some failures were detected in COD and ammonia simulations.

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Sludge reduction, nitrous oxide emissions, and phosphorus removal by oxic-settling-anaerobic (OSA) process: the effect of hydraulic retention time

Mannina,

Cosenza,

Di Trapani

et al. 2024

Environ Sci Pollut Res

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This paper presents a study on reducing sewage sludge by an oxic-settling-anaerobic (OSA) pilot plant compared to the conventional activated sludge (CAS) process in view of resource recovery and moving towards plant carbon neutrality. The OSA plant was supplied with real wastewater and the anaerobic reactor was operated under two hydraulic retention times (HRT) (4 and 6 h). Greenhouse gas (GHG) emissions were monitored for the first time to determine the OSA process’s production mechanism. The results highlighted that under the lowest HRT (4 h), the removal efficiencies of COD and PO4−P, increased from 75 to 89% and from 39 to 50% for CAS and OSA configurations, respectively. The observed yield coefficient was reduced from 0.58 gTSS gCOD−1 (CAS period) to 0.31 gTSS gCOD−1 (OSA period). A remarkable deterioration of nitrification efficiency under OSA configuration was obtained from 79% (CAS) to 27% (OSA with HRT of 6 h). The huge deterioration of nitrification significantly affected the GHG emissions, with the N2O-N fraction increasing from 1% (CAS) to 1.55% (OSA 4 h HRT) and 3.54% (OSA 6 h HRT) of the overall effluent nitrogen, thus suggesting a relevant environmental implication due to the high global warming potential (GWP) of N2O. Graphical abstract

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Oxic settling anaerobic (OSA) process for excess sludge reduction: 16 months of management of a pilot plant fed with real wastewater

Cited by 23 publications

References 24 publications

A review on promising strategy to decrease sludge production: Oxic-settling-anoxic/anaerobic process

A review on promising strategy to decrease sludge production: Oxic-settling-anoxic/anaerobic process

Simulation of an Oxic-Settling-Anaerobic Pilot Plant Operated under Real Conditions Using the Activated Sludge Model No.2d

Sludge reduction, nitrous oxide emissions, and phosphorus removal by oxic-settling-anaerobic (OSA) process: the effect of hydraulic retention time

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