The application of ZVI based iron-gels in remediation techniques
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 surfa...
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| Dokumentumtípus: | Könyv része |
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SZAB
Szeged
2012
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| Sorozat: | Proceedings of the International Symposium on Analytical and Environmental Problems
17 |
| Kulcsszavak: | Biotechnológia |
| Tárgyszavak: | |
| Online Access: | http://acta.bibl.u-szeged.hu/76427 |
| Tartalmi kivonat: | 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. |
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| Terjedelem/Fizikai jellemzők: | 215-218 |
| ISBN: | 978-963-315-066-5 |