Co-metabolism of nonylphenol ethoxylate in sequencing batch reactor under aerobic conditions

Ekdal, Alpaslan; Taş, Didem Okutman; Zengin, Gülsüm Emel; Onay, Irmak Batı; Hancı, Tuğba Ölmez; Orhon, Derin; Çokgör, Emine Ubay

doi:10.1007/s10532-022-09974-1

Cited by 4 publications

(2 citation statements)

References 48 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…15 Currently, the activated sludge models also involve a number of processes aside from microbial growth, [16][17][18][19] mainly due to COD fractionation, a major milestone that identified substrate (COD) fractions with different biodegradation characteristics. [20][21][22][23] These models could be evaluated with the experimental support of respirometry, an equally significant milestone that enabled the identification of COD fractions with corresponding processes through the model calibration of oxygen uptake rate (OUR) profiles. Respirometry was adopted to also assess the impact of inhibition, simply by generating OUR profiles with and without inhibitor addition and then evaluating resulting changes in the process kinetics, i.e., observed changes in model coefficients of different processes, as the inhibitory impact.…”

Section: Introductionmentioning

confidence: 99%

“…This approach has been quite inadequate and even misleading for the accurate understanding and interpretation of substrate utilization mechanisms under stress, mainly because of the imprecise nature of the parameters selected for substrate and biomass 15 . Currently, the activated sludge models also involve a number of processes aside from microbial growth, 16‐19 mainly due to COD fractionation, a major milestone that identified substrate (COD) fractions with different biodegradation characteristics 20‐23 . These models could be evaluated with the experimental support of respirometry, an equally significant milestone that enabled the identification of COD fractions with corresponding processes through the model calibration of oxygen uptake rate (OUR) profiles.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Significance of enriched culture on the assessment of the acute inhibitory impact of sulfamethoxazole on nitrifying biomass

Katipoglu‐Yazan

Çokgör

Orhon

2022

J of Chemical Tech & Biotech

Self Cite

View full text Add to dashboard Cite

BACKGROUND: Autotrophic microorganisms are quite vulnerable to environmental conditions and to inhibitory actions that would upset nitrification mechanisms. A reliable numerical assessment of the adverse impact is needed for proper remedial action. This study focused on the kinetic response of the nitrifying fraction within the activated sludge biomass under acute exposure to sulfamethoxazole (SMX), utilizing and emphasizing the role of enriched culture. A mixed culture sustained with an enrichment technique was used to generate oxygen uptake rate profiles, where ammonia was the sole substrate with different SMX concentrations.RESULTS: Model calibration studies yielded specific growth rates of 1.40/day for the ammonia oxidizing fraction and 0.65/day for the nitrite oxidizing fraction acting as the rate limiting step for the overall nitrification process. SMX did not appreciably affect the specific growth rates, but it induced a significant increase in half saturation coefficients. Moreover, increased endogenous decay rates were estimated.CONCLUSION: Model calibration values indicated that SMX induced competitive inhibition on microbial growth and enhanced endogenous respiration due to an increasing demand for the maintenance energy to activate antibiotic resistance. This underlines the merit of further studies on conditions to sustain resistant microorganisms capable of tolerating and even degrading antibiotics in biological systems.

show abstract