期刊
BIODEGRADATION
卷 22, 期 3, 页码 661-671出版社
SPRINGER
DOI: 10.1007/s10532-010-9439-8
关键词
Anoxic rotating biological contactor; C/N ratio; Denitrification; Landfill leachate; Phosphorus
资金
- Fundacao para a Ciencia e Tecnologia (FCT) [SFRH/BD/24715/2005, SFRH/BPD/26803/2006]
- Fundação para a Ciência e a Tecnologia [SFRH/BD/24715/2005] Funding Source: FCT
The denitrification performance of a lab-scale anoxic rotating biological contactor (RBC) using landfill leachate with high nitrate concentration was evaluated. Under a carbon to nitrogen ratio (C/N) of 2, the reactor achieved N-NO(3) (-) removal efficiencies above 95% for concentrations up to 100 mg N-NO(3) (-) l(-1). The highest observed denitrification rate was 55 mg N-NO(3) (-) l(-1) h(-1) (15 g N-NO(3) (-) m(-2) d(-1)) at a nitrate concentration of 560 mg N-NO(3) (-) l(-1). Although the reactor has revealed a very good performance in terms of denitrification, effluent chemical oxygen demand (COD) concentrations were still high for direct discharge. The results obtained in a subsequent experiment at constant nitrate concentration (220 mg N-NO(3) (-) l(-1)) and lower C/N ratios (1.2 and 1.5) evidenced that the organic matter present in the leachate was non-biodegradable. A phosphorus concentration of 10 mg P-PO(4) (3-) l(-1) promoted autotrophic denitrification, revealing the importance of phosphorus concentration on biological denitrification processes.
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