DENITRIFICATION OF NITRATE BY COMBINED ULTRASOUND AND ZERO VALENT MAGNESIUM AT pH CONTROLLED CONDITIONS

Burcu İleri; Ömer Apaydın; Önder Ayyıldız

DENITRIFICATION OF NITRATE BY COMBINED ULTRASOUND AND ZERO VALENT MAGNESIUM AT pH CONTROLLED CONDITIONS

Abstract

In this study, ultrasound (US), zero-valent magnesium (Mg0) and their simultaneous combination were tested at different Mg0 doses (0.5, 1, 1.5, 2 ve 2.5 g/L), pH values (2, 4, 7 ve 9) and ultrasonic powers (30, 60 ve 90 W) for nitrate reduction. Ultrasound alone was found to be ineffective for nitrate removal at different pH values. Effect of ultrasonic power for pH controlled operation, nitrate reduction was increased with increasing dose of magnesium powder. Ultrasound induced profound effects on denitrification capacity of magnesium particles. For example, with controlling pH at 4, 95% of initial nitrate was reduced by 2.5 g/L of magnesium powder within 60 min, while keeping the applying combined US/Mg0 for 30, 60, and 90 W ultrasonic powers at the same dose, required durations to achieve at the same nitrate removal efficiencies were determined to be approximately 30, 20 and 20 min, respectively. When pH was controlled at 7 and 9, up to 70% of nitrate was removed by 2.5 g Mg0/L dose after 60 min , but in the same conditions with 90 W ultrasonic power a complete nitrate reduction was attained only within 30 min. Effect of ultrasonic on magnesium surface activation and nitrate removal was arised more clearly at alkaline conditions, when particle surface passivation was increased at increased pH . Nitrogen gas (N2), nitrite (NO2-) and ammonium/ammonia (NH4+/NH3) were detected as the major denitrification by-products following US/Mg0 treatment. As more ultrasonic power and magnesium dose were applied, the rate of conversion of nitrate to nitrogen gas increased significantly.

Keywords

References

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Details

Primary Language

English

Subjects

Engineering

Journal Section

Research Article

Authors

Burcu İleri This is me
Türkiye

Ömer Apaydın This is me
Türkiye

Önder Ayyıldız This is me
Türkiye

Publication Date

September 1, 2015

Submission Date

December 17, 2014

Acceptance Date

July 15, 2015

Published in Issue

Year 2015 Volume: 33 Number: 4

IZ

https://izlik.org/JA77PN97DE

Cite

RIS / Bibtex

APA

İleri, B., Apaydın, Ö., & Ayyıldız, Ö. (2015). DENITRIFICATION OF NITRATE BY COMBINED ULTRASOUND AND ZERO VALENT MAGNESIUM AT pH CONTROLLED CONDITIONS. Sigma Journal of Engineering and Natural Sciences, 33(4), 489-501. https://izlik.org/JA77PN97DE

AMA

1.İleri B, Apaydın Ö, Ayyıldız Ö. DENITRIFICATION OF NITRATE BY COMBINED ULTRASOUND AND ZERO VALENT MAGNESIUM AT pH CONTROLLED CONDITIONS. SIGMA. 2015;33(4):489-501. https://izlik.org/JA77PN97DE

Chicago

İleri, Burcu, Ömer Apaydın, and Önder Ayyıldız. 2015. “DENITRIFICATION OF NITRATE BY COMBINED ULTRASOUND AND ZERO VALENT MAGNESIUM AT PH CONTROLLED CONDITIONS”. Sigma Journal of Engineering and Natural Sciences 33 (4): 489-501. https://izlik.org/JA77PN97DE.

EndNote

İleri B, Apaydın Ö, Ayyıldız Ö (September 1, 2015) DENITRIFICATION OF NITRATE BY COMBINED ULTRASOUND AND ZERO VALENT MAGNESIUM AT pH CONTROLLED CONDITIONS. Sigma Journal of Engineering and Natural Sciences 33 4 489–501.

IEEE

[1]B. İleri, Ö. Apaydın, and Ö. Ayyıldız, “DENITRIFICATION OF NITRATE BY COMBINED ULTRASOUND AND ZERO VALENT MAGNESIUM AT pH CONTROLLED CONDITIONS”, SIGMA, vol. 33, no. 4, pp. 489–501, Sept. 2015, [Online]. Available: https://izlik.org/JA77PN97DE

ISNAD

İleri, Burcu - Apaydın, Ömer - Ayyıldız, Önder. “DENITRIFICATION OF NITRATE BY COMBINED ULTRASOUND AND ZERO VALENT MAGNESIUM AT PH CONTROLLED CONDITIONS”. Sigma Journal of Engineering and Natural Sciences 33/4 (September 1, 2015): 489-501. https://izlik.org/JA77PN97DE.

JAMA

1.İleri B, Apaydın Ö, Ayyıldız Ö. DENITRIFICATION OF NITRATE BY COMBINED ULTRASOUND AND ZERO VALENT MAGNESIUM AT pH CONTROLLED CONDITIONS. SIGMA. 2015;33:489–501.

MLA

İleri, Burcu, et al. “DENITRIFICATION OF NITRATE BY COMBINED ULTRASOUND AND ZERO VALENT MAGNESIUM AT PH CONTROLLED CONDITIONS”. Sigma Journal of Engineering and Natural Sciences, vol. 33, no. 4, Sept. 2015, pp. 489-01, https://izlik.org/JA77PN97DE.

Vancouver

1.Burcu İleri, Ömer Apaydın, Önder Ayyıldız. DENITRIFICATION OF NITRATE BY COMBINED ULTRASOUND AND ZERO VALENT MAGNESIUM AT pH CONTROLLED CONDITIONS. SIGMA [Internet]. 2015 Sep. 1;33(4):489-501. Available from: https://izlik.org/JA77PN97DE