The application of ZVI based iron-gels in remediation techniques

Antal Péter and Koós Ákos and Füvesi Hajnalka and Portörő Péter and Kesserű Péter: The application of ZVI based iron-gels in remediation techniques.

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Abstract

Zero valent iron (ZVI) has been widely used to treat contaminants, like chlorinated hydrocarbons, and it was documented as effective degrading agent of other environmental pollutants. ZVI can reduce halogenated compounds through iron oxidation, however, this process is mainly influenced by the surface of the iron particles. Nano ZVI technology has been developed to maximize the reactive surface of the iron, however, the costs of a treatment process are still quite high and the increased reductive capacity can be toxic. In present work, the combination of the relatively low costs of the traditional ZVI technology and the increased reductive capacity of the nano ZVI technology, avoiding the toxic levels, was tried to be achieved by developing ZVI gels (ZVIG). In up-flow columns filled with the same amount iron (iron powder) in sand (ZVI-P), and gels (ZVIG-A, ZVIG-B), the differences of reduction capacities were determined through nitrate reduction. This process was chosen because of the manageability of nitrate and the fact that ZVI is able to reduce it to ammonia. The column filled with ZVIG-B showed 65 % nitrate reduction from the beginning and maintained this value for 60 days. After the 60th day, a continuous decrease was observed in the efficiency, which reached 10 % after the 160th day. However, ZVIG-A showed 33 % nitrate reduction capacity from the beginning, and the reduction capacity quickly decreased to less than 10 %. After the 15 th day, the effectiveness increased rapidly. The same phenomenon could be observed in the ZVI-P column. ZVIG-A could maintain this increased reduction capacity, but the iron powder could not. The nitrate reduction capacity of ZVI-P started to decrease after the 30th day, and it reached 20 % after the 55th day.

Item Type:	Conference or Workshop Item
Journal or Publication Title:	Proceedings of the International Symposium on Analytical and Environmental Problems
Date:	2012
Volume:	17
ISBN:	978-963-315-066-5
Page Range:	pp. 215-218
Language:	English
Publisher:	SZAB
Place of Publication:	Szeged
Event Title:	International Symposium on Analytical and Environmental Problems (17.) (2011) (Szeged)
Event Type:	Conference
Event Location:	Szeged
Event Dates:	2011. szeptember 19.
Related URLs:	http://acta.bibl.u-szeged.hu/76381/
Uncontrolled Keywords:	Biotechnológia
Additional Information:	Bibliogr.: 218. p. ; ill. ; összefoglalás angol nyelven
Subjects:	02. Engineering and technology 02. Engineering and technology > 02.07. Environmental biotechnology
Date Deposited:	2022. Aug. 10. 08:30
Last Modified:	2022. Aug. 22. 10:23
URI:	http://acta.bibl.u-szeged.hu/id/eprint/76427

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