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Title: Nitrogen management in bioreactor landfills

One scenario for long-term nitrogen management in landfills is ex situ nitrification followed by denitrification in the landfill. The objective of this research was to measure the denitrification potential of actively decomposing and well decomposed refuse. A series of 10-l reactors that were actively producing methane were fed 400 mg NO{sub 3}-N /l every 48 h for periods of 19-59 days. Up to 29 nitrate additions were either completely or largely depleted within 48 h of addition and the denitrification reactions did not adversely affect the leachate pH. Nitrate did inhibit methane production, but the reactors recovered their methane-producing activity with the termination of nitrate addition. In well decomposed refuse, the nitrate consumption rate was reduced but was easily stimulated by the addition of either acetate or an overlayer of fresh refuse. Addition of acetate at five times the amount required to reduce nitrate did not lead to the production of NH{sub 4}{sup +} by dissimilatory nitrate reduction. The most probable number of denitrifying bacteria decreased by about five orders of magnitude during refuse decomposition in a reactor that did not receive nitrate. However, rapid denitrification commenced immediately with nitrate addition. This study shows that the use of a landfillmore » as a bioreactor for the conversion of nitrate to a harmless byproduct, nitrogen gas, is technically viable.« less
Authors:
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Publication Date:
OSTI Identifier:
20875611
Resource Type:
Journal Article
Resource Relation:
Journal Name: Waste Management; Journal Volume: 23; Journal Issue: 7; Conference: 2. intercontinental landfill research symposium, Asheville, NC (United States), 13-16 Oct 2002; Other Information: DOI: 10.1016/S0956-053X(03)00104-1; PII: S0956053X03001041; Copyright (c) 2003 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; ACETATES; BACTERIA; CONSUMPTION RATES; DECOMPOSITION; DENITRIFICATION; METHANE; NITRATES; NITRIFICATION; NITROGEN; NITROGEN OXIDES; PH VALUE; SANITARY LANDFILLS; SOLID WASTES