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Ο κύκλος του αζώτου σε τεχνητούς υγροβιότοπους και η επίδραση της βλάστησης σε αυτόν

Papageorgiou Nafsika

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Summary

Main goal of the present study was the investigation of the N circle along with the contribution of vegetation on CW. For this purpose, six pilot FWCWs were built in Technical University of Crete, 2 without vegetation, 2 with Typha Latifolia and 2 with Arundo Donax. The experiment took place under controlled conditions with often samplings and the use of synthetic sewage. Results showed that there are significant differences between the wetlands that were planted and those who weren’t regarding the removal of NH4-N, AA and TKN. Additionally, there was observed a generally better confrontation in the systems that were planted with T. Latifolia compared to those planted with A. Donax, which is observed more specific in the AA, NH4-N and TKN. NH4-N removal rates were negative, and ranged between -62 mg/m2/d (for the unplanted systems) to -10 mg/m2/d (for systems planted with T. Latifolia). The results reveal inhibition of nitrification, probably because of the anoxic environment and the small retention time in the systems. The main N removal procedure in the examined CWs planted with T. Latifoliaseems to be denitrification (with removal rates up to 61.95 mg/m2/d), while for the rest CWs there doesn’t seem to be a main N removal process. ANAMMOX procedure erquires further research along with specialized methods (FISH, qPCR, N isotopes) . Summarizing, all above show the need for further research on the N cycle in the CWs, on the quantification of the ANAMMOX contribution and on optimizing the design of the CWs regarding N removal efficiency.

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