Biological Nitrogen Removal From Landfill Leachate: A Pilot-Scale Study  

Oleh:

Pelkonen, Markku ; Kotro, Mikko ; Rintala, Jukka

Jenis: Article from Journal - ilmiah internasional
Dalam koleksi: Waste Management & Research vol. 17 no. 6 (Dec. 1999), page 493-497.
Topik: Anaerobic pretreatment; biological treatment; costs; landfill leachate; low temperature; nitrogen removal; seasonal variation
Fulltext: 493.pdf (471.0KB)

Isi artikel

A pilot-scale two-stage process including an anaerobic pretreatment (up-flow anaerobic sludge blanket, UASB) unit and a pre-denitrification activated sludge process was studied for treating leachates from a municipal landfill (waste aged 4 to 5 years, area 2.5 ha) and from a windrow composting area (1ha). A single-stage pilot process was used for nitrification studies. The leachate characteristics were as follows: COD 740 to 2400 mg 1-1 (chemical oxygen demand), BOD 7 (biochemical oxygen demand) approximately 1000 mg 1-1 , Ntot 40 to 120 mg 1-1 and the temperature was between 2 and 21°C. The results show that 45 to 50% COD removal could be achieved in the UASB reactor even at temperatures below 10°C. The activated sludge process was operated with a 1.1 to 2.2 d hydraulic retention time and at between 8 and 21°C. The removal efficiencies were 80 to 90% for COD, over 98% for BOD 7, over 90% for NH 4-N and over 70% for Ntot The dependence of denitrification efficiency on leachate biodegradable COD fraction and COD to N ratio was evaluated. Overall treatment efficiencies were good and applicable for design purposes. The total costs were estimated for a full scale pre-denitrification process at FIM 10 to 20 m-3 and FIM 50 to 90 (kg N removed) -1 (3.5 to 7 DM m-3 and 17 to 30 DM [kg N removed] -1) for a landfill representing circumstances in Southern Finland with an annual average flow of 50 m3 d-1

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