Ayşe Burcu İLERİ, Özge TERZİOĞLU, Yasemin ÇİÇİ

Sıfır Değerlikli Mangan ve Ultrases ile Nitratın Kimyasal Denitrifikasyonu

Bu çalışmada, sıfır değerlikli mangan (Mn0 ) ve ultrases (US) prosesleri tekli ve birleşik (US/Mn0 ) kullanılarak, partikül dozu (0.5, 0.75, 1, 1.5 ve 2 g) ile reaksiyon süresinin (0-60 dk) nitrat (NO3 - ) giderimine etkisi araştırılmıştır. Ultrases prosesi tek başına uygulandığında nitrat (NO3 - ) giderimine etkisi az iken; Mn0 dozu arttıkça NO3 - giderimi yükselmiştir. Birleşik US/Mn0 uygulamasında ise ultrases etkisiyle Mn0 partiküllerinin kimyasal denitrifikasyon kapasitesini arttırdığı belirlenmiştir. Sadece Mn0 ile 60 dk sonunda %70 civarında NO3 - giderimi gerçekleşirken, aynı deneysel şartlarda ultrasonik mekanik kuvvet etkisi ile 30 dk içerisinde %95 civarında bir NO3 - giderimi elde edilmiştir. US/Mn0 ile nitratın indirgenmesi sonucu nitrit (NO2 - ) ve amonyum (NH4 + ) indirgenme bileşikleri az miktarda oluşurken, azot gazına (N2) dönüşüm oranının arttığı tespit edilmiştir.

Nitrate Chemical Denitrification with Zero-Valent Manganese and Ultrasound

In this study, the effect of particle dose (0.5, 0.75, 1, 1.5 and 2 g) and duration (0-60 min) using zero-valent manganese (Mn0 ) and ultrasound (US) processes alone and combined (US/Mn0 ) on nitrate (NO3 - ) removal were investigated. When the ultrasound process was applied alone, there was little effect on removal of NO3 - . Also, as the Mn0 dose increased the NO3 - removal increased as well. It was determined that the effect of the combined US/Mn0 application increases the chemical denitrification capacity of Mn0 particles. With only Mn0 at the end of 60 min, only 70% NO3 - removal occurred, while with the ultrasonic mechanical force effect in the same experimental conditions 95% NO3 - removal was obtained within 30 min. The reduction of NO3 - with US/Mn0 led to formation of small amounts of nitrite (NO2 - ) and ammonium (NH4 + ) reduction compounds, with an increase in transformation rate to nitrogen gas (N2) identified.

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