Biological Treatment For Removal Of Organic Material And Ammonium From Leachate At Low Emperatures  

Oleh:

Kettunen, Riitta H. ; Keskitalo, Pertti ; Hoilijoki, Taina H. ; Rintala, Jukka A.

Jenis: Article from Journal - ilmiah internasional
Dalam koleksi: Waste Management & Research vol. 17 no. 6 (Dec. 1999), page 487-492.
Topik: Anaerobic-aerobic treatment; costs; landfill; leachate; low temperature; nitrification
Fulltext: 487.pdf (455.13KB)

Isi artikel

The biological anaerobic-aerobic treatment of mediumstrength municipal landfill leachate (COD (chemical oxygen demand) 1500 to 3200 mg 1-1; BOD 7 (biological oxygen demand) 1200 to 1900 mg 1-1 ; NH 4-N 80 to 270 mg 1-1) was studied by usmg a pilot-scale Upflow Anaerobic Sludge Blanket (UASB) reactor (13 to 28°C) and laboratory-scale activated sludge reactors (5 to 11°C). In the sequential process, 80 to 90% COD removal was achieved with an effluent COD of 250 to 350 mg 1-1 and a BOD 7 of <10 mg 1-1. Most of the organic material was removed during anaerobic pretreatment, and more than 50% COD removal was obtained at 13°C. The aerobic stage served as an ammonium removal and a polishing step. More than 90% of ammonium was efficiently removed by nitrification even at 5°C. The anaerobicaerobic treatment produced effluent fulfilling the official requirements. Furthermore, the sequential process seems sustainable and cost effective for leachate treatment at low temperatures. Based on a preliminary design, leachate treatment costs were estimated at 3.1 to 3.3 EUR m-3 in the sequential process. This compares with the option of discharging leachates into a sewer system. Both the discharge fee and the construction and operational costs of a transfer sewer are considered.

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