Impact of aeration on/off duration on the performance of an intermittently aerated MBR treating real textile wastewater

Yılmaz, Tülay; Demir, Emir Kasım; Basaran, Senem Teksoy; Çokgör, Emine Ubay; Şahinkaya, Erkan

doi:10.1016/j.jwpe.2023.103886

Cited by 9 publications

(6 citation statements)

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“…COD removals ranged from 0 to 16% in the batch tests, except for C4 (aeration on/off time of 15/15 min), at which it was 27%. In the batch test of C4, the nitrification efficiency was the lowest in the MBR 22 . Low COD removal in the batch assays is attributed to the non‐biodegradable nature of the organics present in the tests, as no external organic matter was added in the batch tests, and the soluble COD came from the MBR liquor together with the biomass.…”

Section: Resultsmentioning

confidence: 99%

“…It was aimed to determine the effect of different DO values and the aeration on/off time employed in an MBR 22 on the specific ammonium oxidation rate using batch tests (C1–C8) (Fig. 1).…”

Section: Resultsmentioning

confidence: 99%

“…It seems that the COD remaining in the bioreactor after MBR treatment is not further degraded in the batch tests even after long‐term aeration. Hence, the MBR may provide high performance and the remaining COD may be regarded as non‐biodegradable 22 …”

Section: Resultsmentioning

confidence: 99%

“…Biomass for batch ammonium oxidation/denitrification studies was obtained from a lab‐scale MBR treating real textile wastewater under varying aeration strategies. The MBR achieved COD, color and total nitrogen (TN) removal efficiencies of 84–93%, 40–68% and 25–70%, respectively, depending on the operational conditions 22 . Biomass obtained from the MBR was directly used for the batch studies without making any concentration adjustments, and hence the biomass concentrations (760–3600 mg volatile suspended solids [VSS] L −1 ) in different batch tests were as illustrated in Table 1.…”

Section: Methodsmentioning

confidence: 99%

“…It would be important for the operators and designers to learn about the effects of intermittent aeration on/off time and nitrite/nitrate accumulation on the specific rates and process efficiency. In the present study, we will provide and discuss the specific ammonium oxidation/denitritation/denitrification rates of the biomass obtained from the intermittently aerated MBR for which long‐term performance data were recently published 22 …”

Section: Introductionmentioning

confidence: 99%

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Specific ammonium oxidation and denitrification rates in an MBR treating real textile wastewater for simultaneous carbon and nitrogen removal

Yılmaz

Demir

Basaran

et al. 2023

J of Chemical Tech & Biotech

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BackgroundDissolved oxygen (DO) and aeration on/off time are the determining parameters for simultaneous carbon and nitrogen removal in biological treatment processes. The most effective way to decide the optimum operational conditions, e.g. aeration on/off time or dissolved oxygen concentration during the aeration period, is to determine specific nitrification/denitrification rates. For this purpose, the effects of the dissolved oxygen (DO) (6 and 3 mg/L) and aeration on/off time (from 2/2 min to 90/360 min) on the specific ammonium oxidation and denitritation/denitrification rates in a membrane bioreactor (MBR) treating real textile wastewater were deeply investigated.ResultsThe highest specific ammonium oxidation and denitritation/denitrification rates were obtained as 5.4, 3.8 and 5.3 mg N/(g VSS.h), respectively, at the aeration on/off time of 90/360 min, which corresponded to the increase of specific ammonium oxidation rates by 1.8 and 2.1 times compared to continuous aeration conditions where DO was 6 and 3 mg/L, respectively.ConclusionHigher specific ammonium oxidation and denitrification rates can be achieved with the intermittent aeration compared to continuous aeration. Hence, the existing treatment plants can be retrofitted for higher performance with reduced energy requirements.This article is protected by copyright. All rights reserved.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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