Journal
PROCESS BIOCHEMISTRY
Volume 46, Issue 1, Pages 148-153Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.procbio.2010.07.033
Keywords
Anoxic rotating biological contactor; Mature landfill leachate; Nitrate removal; Ozonation; Phosphorus
Categories
Funding
- Fundacao para a Ciencia e Tecnologia (FCT) [SFRH/BD/24715/2005, SFRH/BPD/26803/2006]
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The removal of nitrate from a mature landfill leachate with high nitrate load in a lab-scale anoxic rotating biological contactor (RBC) was studied. Under a phosphorus-phosphate concentration of 10 mg P-PO43- L-1 and nitrogen-nitrate concentrations above 530 mg N-NO3- L-1 the reactor achieved nitrogen-nitrate removal efficiencies close to 100%, without nitrite or nitrous oxide accumulation. Although the reactor presented a very good denitrification performance, the effluent carbon concentration was still above the legal discharge value. In order to increase the biodegradability of the leachate recalcitrant carbon load, a pre-ozonation was further investigated. The pre-ozonation led to a total organic carbon (TOC) removal of 28%. The sequence of treatments, leachate ozonation followed by RBC denitrification did not affect the denitrification efficiency. In fact, it was possible to attain a denitrification rate of 123 mg N-NO3- L-1 h(-1). The moderate decrease in the carbon load of the final effluent indicated that some recalcitrant compounds were still present after ozonation. The anoxic RBC showed to be a promising technology for removing nitrate from landfill leachate. (C) 2010 Elsevier Ltd. All rights reserved.
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