Biological nitrogen removal from landfill leachate: A pilot-scale study

Pelkonen, MarkkuLaboratory of Environmental Engineering, Helsinki University of Technology (author)

Biological nitrogen removal from landfill leachate : A pilot-scale study

Upprättat; 1999; 20150522 (andbra)
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 (1 ha). A single-stage pilot process was used for nitrification studies. The leachate characteristics were as follows: COD 740 to 2400 mg l-1 (chemical oxygen demand), BOD7 (biochemical oxygen demand) approximately 1000 mg l-1, N(tot) 40 to 120 mg l-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 BOD7, over 90 for NH4-N and over 70 for N(tot). 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.

Kotro, MikkoNordic Envicon Oy, Helsinki University, Development Services (author)
Rintala, Jukka A.University of Jyväskylä, Department of Biology and Environmental Science (author)
Laboratory of Environmental Engineering, Helsinki University of TechnologyNordic Envicon Oy, Helsinki University, Development Services (creator_code:org_t)

In:Waste Management & Research: Wiley17:6, s. 493-4970734-242X1096-36691399-3070

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