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      • KCI등재

        Tertiary denitrification of the secondary effluent in biofilters packed with composite carriers under different carbon to nitrogen ratios

        Yunhong Shi,Nan Wei,Guangxue Wu 대한환경공학회 2016 Environmental Engineering Research Vol.21 No.3

        A new type of biofilter packed with composite carriers was designed for tertiary denitrification of the secondary effluent with removal of both oxidized nitrogen and suspended solids (SS). At the empty bed residence time of 15 min and organic carbon to nitrate nitrogen (C/NO₃-N) ratios of 2, 1.5 and 1 g/g, the removal percentage of NO₃-N was 67%, 58% and 36% in the ethanol biofilter, and was 61%, 43% and 26% in the acetate biofilter, respectively. The biofilters packed with composite carriers removed SS effectively, with the effluent turbidity in both biofilters of less than 3 NTU. During the operating cycle between the biofilter backwashings, the NO₃-N removal percentage decreased initially after backwashing, and then gradually increased. Under C/NO₃-N ratios of 2, 1.5 and 1 g/g, the NO₃-N reduction rate was 1.75, 1.04 and 0.68g/m²/d in the ethanol biofilter, and was 1.56, 1.07 and 0.76 g/m²/d in the acetate biofilter, respectively. In addition, during denitrification, the ratio of the consumed chemical oxygen demand to the removed NO₃-N was 5.06-8.23 g/g in the ethanol biofilter, and was 4.26-8.6 g/g in the acetate biofilter.

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        Nitrogen removal, nitrous oxide emission and microbial community in sequencing batch and continuous-flow intermittent aeration processes

        Yuepeng Sun,Liwei Xin,Guangxue Wu,Yuntao Guan 대한환경공학회 2019 Environmental Engineering Research Vol.24 No.1

        Nitrogen removal, nitrous oxide (N₂O) emission and microbial community in sequencing batch and continuous-flow intermittent aeration processes were investigated. Two sequencing batch reactors (SBRs) and two continuous-flow multiple anoxic and aerobic reactors (CMRs) were operated under high dissolved oxygen (DO) (SBR-H and CMR-H) and low DO (SBR-L and CMR-L) concentrations, respectively. Nitrogen removal was enhanced under CMR and low DO conditions (CMR-L). The highest total inorganic nitrogen removal efficiency of 91.5% was achieved. Higher nitrifying and denitrifying activities in SBRs were observed. CMRs possessed higher N₂O emission factors during nitrification in the presence of organics, with the highest N₂O emission factor of 60.7% in CMR-L. SBR and low DO conditions promoted N₂O emission during denitrification. CMR systems had higher microbial diversity. Candidatus Accumulibacter, Nitrosomonadaceae and putative denitrifiers (N₂O reducers and producers) were responsible for N₂O emission.

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