High-rate activated sludge processes for municipal wastewater treatment: the effect of food waste addition and hydraulic limits of the system

Güven, Hüseyin; Özgün, Hale; Erşahin, Mustafa Evren; Dereli, Recep Kaan; Sinop, Ilknur; Öztürk, İzzet

doi:10.1007/s11356-018-3665-8

Cited by 33 publications

(11 citation statements)

References 43 publications

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“…The experimental site was a WWTP using activated sludge and chlorination routinely applied in municipal wastewater treatment. 54,55 RNA is susceptible to hydrolysis in the presence of hydroxyl groups and under the alkaline conditions of chlorination. 56 However, the present study demonstrated that RNA might not be completely degraded and might be discharged into the river.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Environmental Nucleic Acid Pollution: Characterization of Wastewater Generating False Positives in Molecular Ecological Surveys

et al. 2023

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Environmental nucleic acids (eDNA and eRNA) metabarcoding analyses have attracted considerable research attention as they non-invasively and cost-effectively monitor ecosystems. For heretofore unknown reasons, however, they often detect false positives. Here, we focused on domestic wastewater as a possible source of false positives and characterized fish nucleic acids in the influent and effluent of a wastewater treatment plant (WWTP). The metabarcoding analysis revealed that DNA and RNA detected in the influent wastewater originated from over 120 fish species, and most of these were consumed fish. The nucleic acid content was significantly higher in the influent than in the effluent, and the copy numbers of DNA in the influent were significantly higher than those of RNA. These findings were corroborated by the current literature and indicated that eRNA could effectively mitigate false positives. The present study demonstrated that rivers may be extensively contaminated by fish nucleic acids, and WWTPs substantially alter the quantities and ratios of fish DNA and RNA. Therefore, analyses of the wastewater near sampling points and coverage of the sewage system enable us to select and use the appropriate nucleic acid type (DNA or RNA) for metabarcoding analysis and improve the accuracy of fish species detection and identification.

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Section: ■ Results and Discussionmentioning

confidence: 99%

Environmental Nucleic Acid Pollution: Characterization of Wastewater Generating False Positives in Molecular Ecological Surveys

et al. 2023

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“…Therefore, it is important to introduce an effective strategy for COD removal during the first stage of municipal wastewater treatment. This can be achieved, for example, by a High Rate Activated Sludge (HRAS) process, the main objective of which is to increase the recovery of organic matter from wastewater [24]. The efficiency of COD removal in the HRAS process is usually >50%, however, such technology is not dedicated for nitrogen removal [25,26].…”

Section: Resultsmentioning

confidence: 99%

Evaluation of Partial Nitritation/Anammox (PN/A) Process Performance and Microorganisms Community Composition under Different C/N Ratio

Al‐Hazmi

Grubba

Majtacz

et al. 2019

Water

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A one-stage partial nitritation/anammox (PN/A) process with intermittent aeration is possible under sidestream conditions, but implementation in a mainstream is a challenge due to increased Carbon/Nitrogen (C/N) ratios in domestic wastewater. This study investigated the effect of C/N ratios on process efficiency and the effect of narrowing non-aeration time on process improvement at high chemical oxygen demand (COD) load. An increase in TN removal efficiency was achieved in both series with gradual change of C/N ratio from 1 to 3, from 65.1% to 83.4% and 63.5% to 78% in 1st and 2nd series, respectively. However, at the same time, the ammonium utilization rate (AUR) value decreased with the increase in C/N ratio. At a high COD (C/N = 3) concentration, the process broke down and regained productivity after narrowing the non-aeration time in both series. Shifts in the system performance were also connected to adaptive changes in microbial community revealed by data obtained from 16S rRNA NGS (next-generation sequencing), which showed intensive growth of the bacteria with dominant heterotrophic metabolism and the decreasing ratio of autotrophic bacteria. The study shows that deammonification is applicable to the mainstream provided that the C/N ratio and the aeration/non-aeration time are optimized.

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“…Analysis of the PSD in HRAS processes is important because the size of the sludge particles, through its effect on bioflocculation efficiency, is expected to affect COD recovery efficiency in such processes. 30,56 The particle size distribution (PSD) for the activated sludge flocs in the HL-MSBR at different OLRs is presented in Fig. 3b.…”

Section: Effect Of the Olr On Eps Production And Psd And Their Role I...mentioning

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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High-rate activated sludge processes for municipal wastewater treatment: the effect of food waste addition and hydraulic limits of the system

Cited by 33 publications

References 43 publications

Environmental Nucleic Acid Pollution: Characterization of Wastewater Generating False Positives in Molecular Ecological Surveys

Environmental Nucleic Acid Pollution: Characterization of Wastewater Generating False Positives in Molecular Ecological Surveys

Evaluation of Partial Nitritation/Anammox (PN/A) Process Performance and Microorganisms Community Composition under Different C/N Ratio

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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