IV. Wastewater Treatment Topic IV. 3

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Presentation transcript:

IV. Wastewater Treatment Topic IV. 3 IV. Wastewater Treatment Topic IV. 3. Ammonification, Nitrification and Denitrification. Cycle of Nitrogen in the Nature Ammonification Definition: Anaerobic processes of proteins and carbamide - CO(NH2)2 decomposition resulting in generation of ammonium salts and ammonia as end-products. First faze - carbamide hydrolyses Second faze - ammonification

Nitrification Definition: Aerobic processes leading to decomposition of ammonium salts to nitrites and finally to nitrates (salts of the nitric acid) as end-products. First faze - performed by specific hemotrophic bacteria specie - Nitrosomonas Second faze - performed by specific autotrophic bacteria specie - Nitrobacter Autotrophes utilise the energy, released in ammonum oxidation for cells mass building, delivering the necessary carbon out from CO2 in the air. In this way cycles of C and N transformations interact in the Nature. Dissolved organic substances strongly inhibit the autotrophes.

Denitrification Definition: Anaerobic processes leading to N2 as end-product in a result of carbon assimilation by oxidation of organic substances with as electrons acceptor. Processes of denitrification are due to activities of heterotrophic facultative bacteria species, such as Pseudomonas and some other facultatives Dissolved oxygen is a strong inhibitor for the processes of denitrification In the processes of denitrification less oxygen is utilize than the one, incorporated into the nitrates in the processes of nitrification Nitrogen-gas release in the atmosphere, further on is fixed in the soil by specific bacteria (N-fixators) and is utilized by plants. In this way the cycle of N in the Nature is closed

Cycle of Nitrogen in the Nature