engleski

The impact of temperature on surface water biodenitrification - Kinetic modelling

The biodenitrification study was aimed for the nitrate removal from surface water of the Cetina river (SW) with the use of natural powdered Croatian clinoptilolite as a carrier of bacterial cells in the batch bioreactor. The natural powdered clinoptilolite with the attached bacteria (Bio-NPC) were used for removal of 50-250 mg NO3¯-N/L from the SW. The influence of initial nitrate as well as the temperature impact on the batch biodenitrification process was investigated. The nitrate removal from the SW (C0 = 100 mg NO3¯-N/L) was monitored in the temperature range of 15-35 oC. The denitrification rates increased with the increase of temperature and according to the Arrhenius equation the activation energy was 48.25 kJ/mol. On the basis of the experimental data and literature, the model of biological denitrification process was developed and determinated as the zero order model by the use of an alternated differential method (ID algorithm).

activation energy; clinoptilolite; denitrification; nitrate; surface water; zero order reaction

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