Minimization of excess bio-sludge and pollution load in oxic-settling-anaerobic modified activated sludge treatment for tannery wastewater

Sodhi, Vijay; Bansal, Ajay; Jha, Mithilesh Kumar

doi:10.1016/j.jclepro.2019.118492

Cited by 21 publications

(6 citation statements)

References 33 publications

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“…The efficiency in COD removal was around 85% in CAS systems and slightly higher in OSA systems, approximately 90%. The findings are consistent with findings of past studies by Datta et al [32], where ammonia (100%) and phosphorus (90%) removal efficiencies were found to be nearly the same as in control system and as in [30] in which COD removal efficiencies were very close in control An-CAS and CAS-OSA systems and slightly higher TN removal in CAS-OSA (74%) compared to An-CAS (81%) was found. Khursheed et al [34] and Ye et al [23] have also found nearly equal efficiencies in terms of COD and TN removal.…”

Section: Carbon and Nutrient Removal Efficiency In The Osa Processsupporting

confidence: 92%

“…The greatest corresponding sludge reduction was achieved as 58% operated at an interchange ratio of 7.7% (1/13) in the OSA system. Recent work by Sodhi et al [30] demonstrated the mechanism of excess sludge disruption from real tannery wastewater feed. The oxic-settling anaerobic coupled conventional activated sludge configuration confirmed around 52% of biosludge reduction.…”

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

confidence: 99%

“…Simultaneous nutrient removal and excess sludge in biological wastewater treatment processes are closely related to the microbial population composition in treatment processes [31]. Most studies indicated that the phase of OSA does not adversely affect the removal of COD and total nitrogen performance [19], [30], [32], [33]. For example, data from the 2019 study by Karlikanovaite-Balikci and Yagci [19] showed that efficiency in the removal of nitrogen was approximately the same in SBR and SBR-OSA control systems with a slightly smaller concentration of oxidized nitrogen in the OSA process.…”

Section: Carbon and Nutrient Removal Efficiency In The Osa Processmentioning

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 Processsupporting

confidence: 92%

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

confidence: 99%

Section: Carbon and Nutrient Removal Efficiency In The Osa Processmentioning

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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“…Consequently, EPS hydrolysis and cell lysis were minimized. In previous studies, it was noted that prolonged aerobic starvation conditions were more favorable to induce maintenance metabolism, rather than EPS and cell hydrolysis [45,46]. Therefore, sludge hydrolysis was not observed when scheme A was implemented.…”

Section: Insights Of Assr Operating Conditions On Methane Productionmentioning

confidence: 99%

Influence of the Oxic-Settling-Anaerobic (OSA) Process on Methane Production by Anaerobic Digestion of Sewage Sludge

Corsino

Trapani

Marines

et al. 2023

Water

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The present study evaluated different sludge-reduction mechanisms in the oxic-settling-anaerobic (OSA) process in terms of their effects on methane productivity by anaerobic digestion of sewage sludge. Two different layouts were investigated for the sludge return from an anaerobic side-stream reactor (ASSR) to the anoxic (scheme A) or the aerobic (scheme B) reactor of a pre-denitrification plant. Biochemical methane-potential (BMP) assays performed on the excess sludge revealed that scheme A promoted an overall increase of methane production in the OSA (20 mLCH4 gVSS−1d−1, +19%), although compared with a control CAS plant a significant decrease in the excess sludge production (31%) was obtained. Operating conditions in scheme A caused the occurrence of cell lysis and EPS hydrolysis, thereby increasing the biodegradability of sludge. In contrast, scheme B favoured the occurrence of uncoupling and a maintenance metabolism that did not involve sludge hydrolysis. Consequently, despite a higher reduction of excess sludge (82%), a significant decrease in methane productivity in the OSA (4 mLCH4 gVSS−1d−1, −41%) was observed. Based on the results, implementing the OSA process may allow high levels of methane production by anaerobic digestion to be maintained if specific sludge-reduction mechanisms are triggered in the waterline, also raising the possibility of co-digestion with other feedstocks.

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“…The OSA process consists in the installation of an anaerobic reactor along the sludge recirculation streamline of a CAS system (Morello et al, 2021). In this process, the total sludge production will reduce due to the alternation of aerobic and anaerobic conditions and the absence of exogenous organic sources inside the anaerobic side stream reactor (ASSR) and stimulates the catabolic activity of the microorganisms (Sodhi et al, 2020). Moreover, since this process does not require any additional physical or chemical treatment, it has the advantage of producing sludge that can be further reused (Chen et al, 2003).…”

Section: Introductionmentioning

confidence: 99%

Oxic-Settling-Anaerobic under intermittent aeration: effect on system performance, sludge minimization and greenhouse gas emissions

Bosco Mofatto,

Dı Trapanı,

Cosenza

et al.

Global NEST International Conference on Environmental Science &Amp; Technology

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The paper presents the results of an experimental study carried out on a pilot scale activated sludge system operated under intermittent aeration and fed with real wastewater at the Water Resource Recovery Facility of Palermo University (Italy). The experimental campaign was divided into two periods: in Period I, the pilot plant was operated as a conventional activated sludge system under intermittent aeration with fixed duration of aerated and non-aerated phases. In Period II, the plant layout was modified according to the Oxic-Settling-Anaerobic (OSA) configuration, by adding one anaerobic reactor in the recycling line from the final settler to the biological reactor. The final aim was to assess the reduction of excess sludge production while monitoring both system performance and N2O emissions. The results highlighted that the implementation of OSA configuration lead to a decrease of the sludge yield from 0.45 to 0.35 mgVSS/mgCOD. The COD efficiency remained quite stable and close to 90%. Conversely, OSA configuration negatively affected the pilot plant nitrification, with a significant decrease of NH4-N removal from 91% to 79%. Such reduction was also confirmed by respirometric analysis which showed a change in kinetic behavior from Period I to Period II.

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Minimization of excess bio-sludge and pollution load in oxic-settling-anaerobic modified activated sludge treatment for tannery wastewater

Cited by 21 publications

References 33 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

Influence of the Oxic-Settling-Anaerobic (OSA) Process on Methane Production by Anaerobic Digestion of Sewage Sludge

Oxic-Settling-Anaerobic under intermittent aeration: effect on system performance, sludge minimization and greenhouse gas emissions

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