Influence of Electrode Plate Area and Arrangement of 3BER Reactor on the Nitrogen Removal

In order to improve the nitrogen removal efficiency and effluent quality of the threedimensional electrode biofilm process( 3BER),a new designed 3BER-NC process through expanding the area of electrode plate,reducing the electrode space and changing the electrode arrangement was applied and the effect of current,influent p H and ρ( C) / ρ( N) on the performance and denitrifying bacteria in system were studied in deep denitrification of the tail water from a municipal wastewater treatment plant.The research results showed that the 3BER-NC operated with an optimal current at 200 m A,which was100 m A higher than that of 3BER. Because of its shorter electrode space,the 3BER-NC can slow down the carbon electrolysis and effluent color. Furthermore,the enlargement of electrode plate and the change of electrode position distribution of the 3BER-NC improved the TN removal rate to 86. 45%,which was37. 74% higher than that of 3BER. The current intensity,influent p H and ρ( C) / ρ( N) had great influence on the nitrogen removal at different current and the nitrogen removal efficiency of 3BER-NC was better than 3BER. In the nitrogen removal system of the 3BER-NC,the β-proteobacteria played a leading role with a joint action of heterotrophic and autotrophic denitrifying bacteria.