Nitrogen removal from recycled landfill leachate by ex situ nitrification and in situ denitrification

Journal Article · Sat Jul 01 04:00:00 EDT 2006 · Waste Management

DOI:https://doi.org/10.1016/j.wasman.2005.11.014· OSTI ID:20877595

He, P J ^[1]; Shao, L M ^[1]; Guo, H D ^[1]; Li, G J ^[1]; Lee, D J ^[2]

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1. State Key Laboratory of Pollution Control and Reclamation, Tongji University, Shanghai 200092 (China)
2. Department of Chemical Engineering, National Taiwan University, Taipei 10617, Taiwan (China)

A three-compartment system, comprising a landfill column with fresh municipal solid waste, a column with a well-decomposed refuse layer as methane producer, and a sequential batch reactor as ex situ nitrifying reactor, was employed to remove nitrogen from municipal solid waste leachate. Since food waste comprised a major portion of refuse collected in Shanghai, an intense hydrolysis reaction occurred and caused the rapid accumulation of ammonia nitrogen (NH{sub 3}-N) and total organic carbon in the leachate. This paper discusses the role of the three mentioned units and the design and operation of the proposed system. With most NH{sub 3}-N being converted to nitrite nitrogen (NO{sub 2}{sup -}-N) or nitrate nitrogen (NO{sub 3}{sup -}-N) by the nitrifying reactor, and with the well-decomposed refuse layer transforming most dissolved organic compounds to CO{sub 2}, carbonates and methane, it was found that the fresh refuse column could efficiently denitrify the hydrolyzed nitrogen to N{sub 2} gas. The role of the three mentioned units and comments on the design and operation of the proposed system are also discussed.

• OSTI ID: 20877595
• Journal Information: Waste Management, Journal Name: Waste Management Journal Issue: 8 Vol. 26; ISSN WAMAE2; ISSN 0956-053X
• Country of Publication: United States
• Language: English

Related Subjects

60 APPLIED LIFE SCIENCES
AMMONIA
CARBON DIOXIDE
DENITRIFICATION
FOOD
HYDROLYSIS
METHANE
NITRATES
NITRIFICATION
NITROGEN
SANITARY LANDFILLS
SOLID WASTES