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Denitrification capacity in response to increasing nitrate loads and decreasing organic carbon contents in injected leachate of a simulated landfill reactor

Paper ID Volume ID Publish Year Pages File Format Full-Text
35560 45095 2009 4 PDF Available
Title
Denitrification capacity in response to increasing nitrate loads and decreasing organic carbon contents in injected leachate of a simulated landfill reactor
Abstract

Ex situ nitrification followed by denitrification inside the landfill has been recommended to remove ammonia from leachate. The effects of increasing nitrate load and decreasing organic carbon content in the injected leachate on the denitrifying capacity of municipal solid waste (MSW) were investigated. Results showed that MSW possesses a high denitrification capacity. Nitrate reduction could be initiated within 48 h after the first addition of nitrate. Nitrate reduction rate increased with the increasing nitrate loading concentration. When the nitrate loading concentration was increased to 850 mg L−1, nitrate reduction rate reached up to 35 mg L−1 h−1. Nitrite accumulation could be found after the addition of nitrate in each test. However, the maximum nitrite accumulation efficiency declined with increased nitrate load. Organic carbon played an important role in the reduction of nitrate, and both endogenous and exogenous organic materials could act as electron donors.

Keywords
Municipal solid waste; Bioreactor landfill; Denitrification capacity; Leachate recirculation; Biochemical degradation; Organic carbon
First Page Preview
Denitrification capacity in response to increasing nitrate loads and decreasing organic carbon contents in injected leachate of a simulated landfill reactor
Publisher
Database: Elsevier - ScienceDirect
Journal: Process Biochemistry - Volume 44, Issue 4, April 2009, Pages 486–489
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering