Assessment of Anammox process against acute and long-term exposure of ZnO nanoparticles

Sari, Tuğba; Can, Safiye; Akgül, Deniz

doi:10.1016/j.scitotenv.2020.138603

Cited by 23 publications

(20 citation statements)

References 59 publications

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“…Zhao et al (2019) pointed out 24 h shortterm exposure of ZnO NPs (5, 50, 150 mg/L) caused gradually decrement in EPS release by anammox granules. However, Sari et al (2020) emphasized that, long-term exposure of ZnO NPs increased the EPS secretion in anammox reactor up to 40 mg/L NPs dosage. Consequently, in the current study, the EPS production gradually decreased inversely proportional to the increase in inhibition percentage.…”

Section: Eps Response Of Anammox Bacteriamentioning

confidence: 99%

“…NPs may be released into the ecosystems at every stage of their life cycles. Not only the fate of them in the environment, but also their toxicity levels are determined by their physicochemical properties which undergo some changes in different environment matrices (Liu et al, 2019;Senapati & Kumar, 2018). A significant amount of NPs has been detected in wastewaters and solid waste landfill sites (Keller & Lazareva, 2014;Musee et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

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Short-term inhibitory effects of TiO2 NPs on Anammox process

Sari¹,

Bektas²,

Akgül³

2020

biost

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Anammox process has brought about cost-effective, eco-friendly, and innovative technologies to wastewater treatment by reducing the operational cost of treatment plants and decreasing greenhouse gas emissions. Titanium dioxide (TiO2), as one of the most prevalent nanoparticles (NPs) in the world, is being used in various consumer products and applications. In recent years, studies have focused on potential toxicological impacts of NPs on biological processes due to their endless production and consumption. In this context, the first time in the literature, 24 h acute TiO2 NPs exposure on Anammox process was investigated. Deterioration on anammox activity gradually increased with increasing applied TiO2 NPs concentration. At 300 mg/L exposure dose, nitrogen removal rate dramatically decreased to 37.09 ± 0.24 mgN/ gVSS.d and a severe inhibition (80.57% ± 1.17%) was observed. Among the several curve fit models, non-linear second order polynomial (quadratic) model was the best fit one with IC50 of 154 mg/L. Scanning electron microscope (SEM) images demonstrated the tendency of TiO2 NPs to aggregate and attach to the surface of the bacteria. Extracellular polymeric substance (EPS) response of anammox bacteria was also investigated and it was found that, the total EPS content gradually decreased by increasing TiO2 NPs concentration.

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Section: Eps Response Of Anammox Bacteriamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Short-term inhibitory effects of TiO2 NPs on Anammox process

Sari¹,

Bektas²,

Akgül³

2020

biost

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“…The ZnO NPs toxicity on anammox activity in a short-term manner has already been reported by a few studies in the current literature. However, the observed inhibition effects of ZnO NPs show differences in these studies due to the different experimental setups, operational strategies, microbial dynamics, and the sludge type (Sari et al 2020a). Besides, to the best of our knowledge, no study has assessed whether the acute toxicity of ZnO NPs on anammox bacteria is persistent or not.…”

Section: Recovery Profile Of Anammox Bacteria Following the Acute Exposure Of Zno Npsmentioning

confidence: 99%

“…The experimental setup of the anammox bioreactor was established as previously described by Sari et al (2020a). Lab-scale anammox bioreactor with 2 L working volume was established in order to enrich anammox bacteria for batch tests.…”

Section: Enrichment Of Anammox Bacteria and Reactor Operationmentioning

confidence: 99%

“…ZnO NPs are among the top 3 most-produced NPs worldwide (Chen & Chunying 2017). In the current literature, there are a few studies related to the impacts of ZnO NPs on the Anammox process (Sari et al 2020a). These studies mostly focused on short-and long-term effects of ZnO NPs on the Anammox process, but not on its recovery profile following to acute exposure.…”

Section: Graphical Abstract Introductionmentioning

confidence: 99%

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Recovery profile of anaerobic ammonium oxidation (anammox) bacteria inhibited by ZnO nanoparticles

Can

Sari

Akgül

2021

Water Science and Technology

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The potential effects of nanoparticles (NPs) on biological treatment processes have become significant due to their increasing industrial applications. The purpose of this research was to investigate the self-recovery ability of anammox bacteria following to acute ZnO NPs toxicity. In this context, a 2-liter lab-scale anammox reactor was operated for 550 days to enrich the biomass required to the batch exposure tests. Anammox culture was firstly exposed to four different doses of ZnO NPs (50, 75, 100 and 200 mg/L) for 24 h. Then, the ZnO NPs were removed and self-recovery performance of the anammox bacteria was assessed by evaluating the nitrogen removal capacities for 72 h. Besides the nitrogen removal performance, extracellular polymeric substances (EPS) production was also detected to deeply understand the response of the enriched anammox culture against ZnO NPs exposure. The results revealed that, sudden and high load of ZnO NPs (100 and 200 mg/L) resulted in persistent impairment on the nitrogen removal performance of the enriched anammox culture. However, relatively lower doses (50 and 75 mg/L) caused deceleration of the nitrogen removal performance during the recovery period. In addition, EPS content in the reactor decreased along with escalating load of ZnO NPs.

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Effect of rare earth element Y(III) on short‐term denitrification performance of anaerobic ammonia oxidized granular sludge

Wan

Xiao

et al. 2022

J of Chemical Tech & Biotech

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BACKGROUND The ammonia‐nitrogen wastewater generated during rare‐earth mining poses a serious hazard to the environment around the mine. This type of wastewater is difficult to treat using conventional biological methods due to its low carbon‐to‐nitrogen ratio. Anaerobic ammonia oxidation (anammox) has become the first choice for treating rare earth mine wastewater. However, the effect of rare earth elements (REEs) in wastewater on anammox bacteria has been insufficiently studied, and this limits the application of this process. Yttrium is a rare earth element present in wastewater, and the study of its effect on anammox can help in the application of this process in rare earth mine wastewater. RESULTS The effect of Y(III) on anammox granular sludge was studied using batch experiments. Anammox activity decreased with increasing Y(III) concentration, from 64.78 ± 0.28 to 17.15 ± 2.70 mg g−1 VSS day−1. The semi‐inhibitory concentration (IC50) of Y(III) for anammox activity was 30.36 mg L−1. Y (III) exhibited low promotion and high inhibition of anammox bacterial extracellular polymer secretion (EPS). Comparing the kinetic models, the Loung model is better suited for describing the kinetic equation of substrate concentration on anammox. CONCLUSION The acute toxicity of Y(III) to anaerobic sludge is influenced by the substrate and Y (III) concentrations. EPS‐based defence strategies play an important role in counteracting the toxicity of Y(III). The Edwards model fits the experimental data well and is suitable for predicting the inhibition of anammox activity by the substrate concentration. © 2022 Society of Chemical Industry (SCI).

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Assessment of Anammox process against acute and long-term exposure of ZnO nanoparticles

Cited by 23 publications

References 59 publications

Short-term inhibitory effects of TiO2 NPs on Anammox process

Short-term inhibitory effects of TiO2 NPs on Anammox process

Recovery profile of anaerobic ammonium oxidation (anammox) bacteria inhibited by ZnO nanoparticles

Effect of rare earth element Y(III) on short‐term denitrification performance of anaerobic ammonia oxidized granular sludge

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