Effect of Different Nanomaterials on the Metabolic Activity and Bacterial Flora of Activated Sludge Medium

Ergön-Can, Tülay; Köseoğlu‐İmer, Derya Y.; Algur, Ömer Faruk; Koyuncu, İsmail

doi:10.1002/clen.201500628

Cited by 6 publications

(3 citation statements)

References 36 publications

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“…Button et al [ 216 ], for instance, did not detect any negative effects on microbial community structure and function in wetland systems when exposed for 28 days to ionic Ag, citrate- and PVP-coated Ag NP (at 100 µg/L). These microbial communities, however, developed an Ag resistance, indicating an existing potential to adapt to such emerging stressors by elevating the production of extracellular polymers [ 217 ], while the costs of this adaptation remain unclear. Evidence is increasing that nitrifiers are among the most sensitive microorganisms towards Ag NP [ 218 – 220 ], even when the NP are sulfidized [ 88 ].…”

Section: Np Effects In Communities and Consequences For Trophic Intermentioning

confidence: 99%

Nanoparticles in the environment: where do we come from, where do we go to?

et al. 2018

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Nanoparticles serve various industrial and domestic purposes which is reflected in their steadily increasing production volume. This economic success comes along with their presence in the environment and the risk of potentially adverse effects in natural systems. Over the last decade, substantial progress regarding the understanding of sources, fate, and effects of nanoparticles has been made. Predictions of environmental concentrations based on modelling approaches could recently be confirmed by measured concentrations in the field. Nonetheless, analytical techniques are, as covered elsewhere, still under development to more efficiently and reliably characterize and quantify nanoparticles, as well as to detect them in complex environmental matrixes. Simultaneously, the effects of nanoparticles on aquatic and terrestrial systems have received increasing attention. While the debate on the relevance of nanoparticle-released metal ions for their toxicity is still ongoing, it is a re-occurring phenomenon that inert nanoparticles are able to interact with biota through physical pathways such as biological surface coating. This among others interferes with the growth and behaviour of exposed organisms. Moreover, co-occurring contaminants interact with nanoparticles. There is multiple evidence suggesting nanoparticles as a sink for organic and inorganic co-contaminants. On the other hand, in the presence of nanoparticles, repeatedly an elevated effect on the test species induced by the co-contaminants has been reported. In this paper, we highlight recent achievements in the field of nano-ecotoxicology in both aquatic and terrestrial systems but also refer to substantial gaps that require further attention in the future.

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Section: Np Effects In Communities and Consequences For Trophic Intermentioning

confidence: 99%

Nanoparticles in the environment: where do we come from, where do we go to?

et al. 2018

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“…[114] A recent study showed that nanomaterials such as CNTs, TiO2, SiO2 and Al2O3 nanoparticles influence bacterial respiration and production of extracellular polymeric substances. [115] Experimental and molecular dynamic simulation analyses demonstrated that CNT can enhance direct EET in S. oneidensis by developing a strong electronic conduit with OM c-Cyts (Figure 10B). [116] Cell-secreted flavin mediated EET process is usually dominated in S. oneidensis.…”

Section: Rational Design Of High-performing Ccphf Cathodes For Mesmentioning

confidence: 99%

Dual‐Function Electrocatalytic and Macroporous Hollow‐Fiber Cathode for Converting Waste Streams to Valuable Resources Using Microbial Electrochemical Systems

et al. 2018

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Dual-function electrocatalytic and macroporous hollow-fiber cathodes are recently proposed as promising advanced material for maximizing the conversion of waste streams such as wastewater and waste CO to valuable resources (e.g., clean freshwater, energy, value-added chemicals) in microbial electrochemical systems. The first part of this progress report reviews recent developments in this type of cathode architecture for the simultaneous recovery of clean freshwater and energy from wastewater. Critical insights are provided on suitable materials for fabricating these cathodes, as well as addressing some challenges in the fabrication process with proposed strategies to overcome them. The second and complementary part of the progress report highlights how the unique features of this cathode architecture can solve one of the intrinsic bottlenecks (gas-liquid mass transfer limitation) in the application of microbial electrochemical systems for CO reduction to value-added products. Strategies to further improve the availability of CO to microbial catalysts on the cathode are proposed. The importance of understanding microbe-cathode interactions, as well as electron transfer mechanisms at the cathode-cell and cell-cell interface to better design dual-function macroporous hollow-fiber cathodes, is critically discussed with insights on how the choice of material is important in facilitating direct electron transfer versus mediated electron transfer.

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“…One of the major problems of MBRs is membrane biofouling which causes the flux decline and increases the unit cost of wastewater treatment (Drews, 2010;Lade et al, 2014;Wu and Fane, 2012). Various studies have considered the effect of membrane modification with nanoparticles (Koseoglu-Imer et al, 2013;Rahimi et al, 2015;Ergön-Can et al, 2016) and the effect of the varying operating conditions (Ahmed et al, 2007;Wu et al, 2011;Dvorak et al, 2011) in order to prevent and/or mitigate the biofouling. However, biological-based biofouling mitigation techniques have come forward due to the high costs and instability of the physical and chemical-based approaches.…”

Section: Introductionmentioning

confidence: 99%

Development of a New Approach to Membrane Bioreactor Technology: Enhanced Quorum Quenching Activity

Ergön-Can¹,

Köse-Mutlu

Ağtaş³

et al. 2020

Turkish Journal of Engineering

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Quorum Quenching (QQ) is a mechanism that prevents cell to cell communication and has recently used as an effective control method against biofouling in membrane bioreactors (MBRs). Rotary microbial carrier frame (RMCF) is an innovative application used in QQ-controlled MBRs that provides immobilization medium to QQ bacteria. However, it eventually caused to decrease in QQ activity as a result of a decline in the number of viable QQ cells in the immobilization media over time, especially during long-term MBR operations. In this study, the effect of regeneration of the QQ cells in the immobilization media on biofouling control in MBR was investigated. The growth kinetic of Rhodococcus sp. BH4 as model QQ bacteria was revealed and the bacteria regeneration time was obtained as 28.3 days. In the operation of the regenerated group, an additional QQ activity of 38.2% was achieved compared to control during a 14 day-duration of QQ-controlled MBR operation. It could be indicated that regenerated QQ bacteria reduced SMP and EPS by degrading the signal molecules, thus more efficient control of membrane fouling was achieved.

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Effect of Different Nanomaterials on the Metabolic Activity and Bacterial Flora of Activated Sludge Medium

Cited by 6 publications

References 36 publications

Nanoparticles in the environment: where do we come from, where do we go to?

Nanoparticles in the environment: where do we come from, where do we go to?

Dual‐Function Electrocatalytic and Macroporous Hollow‐Fiber Cathode for Converting Waste Streams to Valuable Resources Using Microbial Electrochemical Systems

Development of a New Approach to Membrane Bioreactor Technology: Enhanced Quorum Quenching Activity

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