Effect of Hydraulic Retention Time on the Performance of High-Rate Activated Sludge System: a Pilot-Scale Study

Güven, Hüseyin; Erşahin, Mustafa Evren; Dereli, Recep Kaan; Özgün, Hale; Sancar, D.; Öztürk, İzzet

doi:10.1007/s11270-017-3598-8

Cited by 26 publications

(7 citation statements)

References 26 publications

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“…Data from full‐scale and pilot‐scale systems showed high variability in bioflocculation outcomes with ESS and COD capture fluctuating in a range of 10‐ to 120‐mg TSS/L (H. Guven et al, 2017; Jimenez et al, 2015; Ngo, Van Winckel, et al, 2021; Rahman et al, 2016, 2019; Rahman et al, 2020) and 21–55% (Dai et al, 2018; Dolejs et al, 2016; H. Guven et al, 2017; Jimenez et al, 2015; Meerburg et al, 2015; Rahman et al, 2020), respectively. This lined up with the significant variation of ESS (7‐ to 113‐mg TSS/L), TSS capture in clarifier (51 to 98%), and COD capture (median at 12% and varied from 0% to 49%) in Scenario A with no bioflocculation control (Figure 6).…”

Section: Resultsmentioning

confidence: 99%

“…Data from full-scale and pilot-scale systems showed high variability in bioflocculation outcomes with ESS and COD capture fluctuating in a range of 10-to 120-mg TSS/L (H. Guven et al, 2017;Jimenez et al, 2015;Ngo, Van Winckel, et al, 2021;Rahman et al, 2016Rahman et al, , 2019Rahman et al, 2020) and 21-55% (Dai et al, 2018;Dolejs et al, 2016;H. Guven et al, 2017;Jimenez et al, 2015;Meerburg et al, 2015;Rahman et al, 2020), respectively.…”

Section: Impact Of Bioflocculation Boundaries On Control Of High-rate...mentioning

confidence: 99%

“…Reported carbon capture from HRAS varied between 21% and 55% of total incoming COD (Dai et al, 2018;Dolejs et al, 2016;H. Guven et al, 2017;Jimenez et al, 2015;Meerburg et al, 2015;Rahman et al, 2020) and effluent suspended solids (ESS) from 10-to 120-mg total suspended solids (TSS)/L (H. Guven et al, 2017;Jimenez et al, 2015;Ngo, Van Winckel, et al, 2021;Rahman et al, 2016Rahman et al, , 2019Rahman et al, 2020), indicating that bioflocculation is variable and a function of SRT, organic loading rate, wastewater composition, reactor configuration, and environmental conditions (Rahman et al, 2020). Recently, high-rate contact-stabilization (CS) was able to mitigate this issue by imposing a feastfamine regime through recycled activated sludge (RAS) aeration (famine) before contacting the sludge with the wastewater (feast).…”

Section: Introductionmentioning

confidence: 99%

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Introducing bioflocculation boundaries in process control to enhance effluent quality of high‐rate contact‐stabilization systems

Ngo

Tampon

Winckel

et al. 2022

Water Environment Research

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High‐rate activated sludge (HRAS) systems suffer from high variability of effluent quality, clarifier performance, and carbon capture. This study proposed a novel control approach using bioflocculation boundaries for wasting control strategy to enhance effluent quality and stability while still meeting carbon capture goals. The bioflocculation boundaries were developed based on the oxygen uptake rate (OUR) ratio between contactor and stabilizer (feast/famine) in a high‐rate contact stabilization (CS) system and this OUR ratio was used to manipulate the wasting setpoint. Increased oxidation of carbon or decreased wasting was applied when OUR ratio was <0.52 or >0.95 to overcome bioflocculation limitation and maintain effluent quality. When no bioflocculation limitations (OUR ratio within 0.52–0.95) were detected, carbon capture was maximized. The proposed control concept was shown for a fully automated OUR‐based control system as well as for a simplified version based on direct waste flow control. For both cases, significant improvements in effluent suspended solids level and stability (<50‐mg TSS/L), solids capture over the clarifier (>90%), and COD capture (median of 32%) were achieved. This study shows how one can overcome the process instability of current HRAS systems and provide a path to achieve more reliable outcomes. Practitioner points Online bioflocculation boundaries (upper and lower limit) were defined by the OUR ratio between contactor and stabilizer (feast/famine). To maintain effluent quality, carbon oxidation was minimized when bioflocculation was not limited (0.52–0.95 OUR ratio) and increased otherwise. A fully automated control concept was piloted, also a more simplified semiautomated option was proposed. Wasting control strategies with bioflocculation boundaries improved effluent quality while meeting carbon capture goals. Bioflocculation boundaries are easily applied to current wasting control schemes applied to HRAS systems (i.e., MLSS, SRT, and OUR controls).

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Section: Resultsmentioning

confidence: 99%

Section: Impact Of Bioflocculation Boundaries On Control Of High-rate...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Introducing bioflocculation boundaries in process control to enhance effluent quality of high‐rate contact‐stabilization systems

Ngo

Tampon

Winckel

et al. 2022

Water Environment Research

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“…The energy savings of the sewage lifting angle needs to be comprehensively analyzed from the sewage lifting system. First of all, in the design stage of the sewage treatment process, it is necessary to broadly investigate the existing pipe network system and the whole process facilities of sewage treatment to minimize the wastewater elevation that needs to be upgraded with the elevation of the processing facility and consideration of the flooding flow mode [66].…”

Section: Advanced Energy Efficient Technologies For Wastewater Trementioning

confidence: 99%

Integration of Green Energy and Advanced Energy-Efficient Technologies for Municipal Wastewater Treatment Plants

Guo

Sun

Pan

et al. 2019

IJERPH

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Wastewater treatment can consume a large amount of energy to meet discharge standards. However, wastewater also contains resources which could be recovered for secondary uses under proper treatment. Hence, the goal of this paper is to review the available green energy and biomass energy that can be utilized in wastewater treatment plants. Comprehensive elucidation of energy-efficient technologies for wastewater treatment plants are revealed. For these energy-efficient technologies, this review provides an introduction and current application status of these technologies as well as key performance indicators for the integration of green energy and energy-efficient technologies. There are several assessment perspectives summarized in the evaluation of the integration of green energy and energy-efficient technologies in wastewater treatment plants. To overcome the challenges in wastewater treatment plants, the Internet of Things (IoT) and green chemistry technologies for the water and energy nexus are proposed. The findings of this review are highly beneficial for the development of green energy and energy-efficient wastewater treatment plants. Future research should investigate the integration of green infrastructure and ecologically advanced treatment technologies to explore the potential benefits and advantages.

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“…Different observations have been previously reported for the effect of the OLR (in the range of HRAS definition) on bioflocculation in non-membrane-based activated sludge processes. Some studies have reported improvement in bioflocculation with the increase in OLR, 4,22,23 another study increasing OLR led to an increase in the fraction of non-flocculating bacteria and a corresponding shift in the particle size distribution (PSD) of sludge particles towards smaller sizes. The positive effect of increasing OLR on bioflocculation has been attributed to the corresponding increase in extracellular polymeric substances (EPS), whereas the negative effect was related to a decrease in the protein to carbohydrate ratio (EPS c /EPS p ) in EPS.…”

Section: Introductionmentioning

confidence: 99%

The application of membrane sequencing batch reactors in high rate activated sludge processes: the effect of the organic loading rate on the bioflocculation and fouling phenomenon

Shafaei¹,

Bonakdarpour²,

Faridizad³

2022

Environ. Sci.: Water Res. Technol.

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Effect of Hydraulic Retention Time on the Performance of High-Rate Activated Sludge System: a Pilot-Scale Study

Cited by 26 publications

References 26 publications

Introducing bioflocculation boundaries in process control to enhance effluent quality of high‐rate contact‐stabilization systems

Introducing bioflocculation boundaries in process control to enhance effluent quality of high‐rate contact‐stabilization systems

Integration of Green Energy and Advanced Energy-Efficient Technologies for Municipal Wastewater Treatment Plants

The application of membrane sequencing batch reactors in high rate activated sludge processes: the effect of the organic loading rate on the bioflocculation and fouling phenomenon

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