Yazar "Kayan, Iremsu" seçeneğine göre listele

Listeleniyor 1 - 2 / 2
  • [ X ]
    Öğe
    Coupling Pyrite-Fenton Process with Aerobic Biodegradation for the Treatment of 2-Chlorophenol
    (Springer International Publishing Ag, 2020) Kayan, Iremsu; Oz, Nilgun Ayman; Kantar, Cetin
    This study investigates the performance of a sequential pyrite-Fenton and biological process for the treatment of 2-chlorophenol (2-CP) containing wastewater using pyrite-Fenton process as a pretreatment stage. Pyrite was tested as a catalyst material in Fenton reaction due to its low cost and high abundance in the environment. All experiments were run in batch mode. The biodegradation experiments were performed under aerobic conditions using glucose as the co-substrate with untreated or Fenton-pretreated 2-CP. Despite the 100% removal of 2-CP in batch pyrite-Fenton reactors, the total organic carbon (TOC) removal only approached 70%, implying the transformation of 2-CP into some chemically stable intermediate reaction by products during pyrite-Fenton oxidation. In systems with no pyrite-Fenton pretreatment, a combined effect of biotic and abiotic processes including biological degradation, sorption, and volatilization played a significant role on 2-CP removal. The pyrite-Fenton pretreatment of 2-CP significantly improved the performance of aerobic biological reactor relative to system with no pyrite-Fenton pretreatment by (1) reducing the toxicity of 2-CP on aerobic microbial cells and (2) enhancing cell growth. Overall, this study shows that pyrite-Fenton pretreatment coupled with aerobic biological degradation could provide a cost-effective solution for the treatment of wastewater containing low-biodegradable toxic compounds such as chlorophenols.
  • [ X ]
    Öğe
    From Wastewater to Worth: Eco-Friendly Nanoparticle Synthesis Based on Microalgae Cultivated in Industrial Wastewater
    (Wiley-V C H Verlag Gmbh, 2025) Kayan, Iremsu; Bahceci, Dilek Senol; Gulec, Neslihan; Dalgic, Busra; Oz, Nilgun Ayman
    Silver nanoparticles (AgNPs) were synthesized in this study through the utilization of microalgae (MA). The bioactive compounds included in microalgae make them natural antibacterial and antifungal agents. However, cultivating microalgae typically necessitates specialized medium, hence elevating expenses. Consequently, to lower costs, this study utilized industrial wastewater, specifically cheese whey wastewater (CWW). Therefore, a form of wastewater recycling has been accomplished, and a sustainable production process has been implemented. Silver nanoparticles were synthesized using Nannochloropsis sp., a type of microalgae, by the green synthesis process. Silver nanoparticles (MA + AgNPs, CWW + MA + AgNPs) derived from microalgae cultivated in both pure and cheese whey media have been synthesized. Transmission electron microscopy (TEM) examination and Fourier transform infrared spectroscopy (FT-IR) measurement have been conducted to observe the production of silver nanoparticles. Their biological actions have been compared. The results indicate that silver nanoparticles derived from microalgae exhibit significant antibacterial activity (inhibition zones up to 17 mm and minimum inhibition concentration [MIC] values down to 31.25 mu g/mL). The characteristics of silver nanoparticles derived from microalgae that influence antioxidant activity and DNA damage have been effectively demonstrated. This study reveals the biotechnological potential of microalgae and the environmental advantages of utilizing wastewater. These in vitro findings show that microalgae-derived nanoparticles display wide-spectrum antimicrobial activity even at very low concentrations and when this is considered in terms of sustainable production process, the mentioned nanoparticles may be promising materials that can be used in future medical and industrial application.