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Nitrogen removal and heavy metals in leachate treatment using SBR technology
KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Mark- och vattenteknik.
2010 (Engelska)Ingår i: Journal of Hazardous Materials, ISSN 0304-3894, E-ISSN 1873-3336, Vol. 174, nr 1-3, s. 679-686Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Biological nitrogen removal by the use of Sequencing Batch Reactors (SBRs) is today an accepted and well proven model. The results of SBR performance on nitrogen removal have encouraged consultants, engineering companies and landfill operators to develop and build full scale SBR plants at a number of sites in Sweden. Two of these plants, Isatra and Norsa, have been studied closely. The Norsa plant treats leachate at a controlled water temperature, while the Isatra plant is exposed to temperature variation throughout the year. Both plants have very well proven nitrogen removal capacities, although winter conditions have an adverse impact on their performance. Typical nitrification efficiency is close to 100%, while the total nitrogen removal is about 90-95% under stable operation conditions. A good relationship between the nitrogen load and the nitrification rate has been observed at the Norsa SBR plant. The heavy metal content in the leachate is very low thanks to anaerobic precipitation inside the landfill into metal sulphides. The heavy metal content in the biological sludge is consequently also very low.

Ort, förlag, år, upplaga, sidor
2010. Vol. 174, nr 1-3, s. 679-686
Nyckelord [en]
Nitrogen removal, Nitrification rate, Heavy metal content, SBR, Leachate
Nationell ämneskategori
Annan naturresursteknik Vattenteknik
Identifikatorer
URN: urn:nbn:se:kth:diva-14322DOI: 10.1016/j.jhazmat.2009.09.104ISI: 000273984000095OAI: oai:DiVA.org:kth-14322DiVA, id: diva2:332220
Anmärkning
QC 20100803Tillgänglig från: 2010-08-03 Skapad: 2010-08-03 Senast uppdaterad: 2017-12-12Bibliografiskt granskad
Ingår i avhandling
1. SBR-technology - use and potential applications for treatment of cold wastewater
Öppna denna publikation i ny flik eller fönster >>SBR-technology - use and potential applications for treatment of cold wastewater
2009 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

Biological nutrient removal is used as an indicator of SBR performance at nine different SBRplants operated for a long period at low water temperatures (5 – 10oC). Typically needed aeratedSRT (Solids Residence Time) for complete nitrification is found to be in the range of 6 – 10 days.Biological phosphorus removal has been found to take place at 5oC.

The specific nitrification and denitrification rates (g N/kg VSS/h) have been found to besubstantially higher than those found in design recommendations. At temperatures < 10 oC thenitrification rates have been found up to 4 g Nox/kg VSS/h.

It has also been possible to establish a relation between the COD/N ratio and the nitrificationrate, showing that the rate increases to high rates when the ratio decreases.

Enhanced biological phosphorus removal has been demonstrated at two different plants even atlow water temperatures 5 – 7 oC.

Efficient biological nitrogen removal and phosphorus removal has been demonstrated at bothlow water temperatures and in presence of very high Chromium concentrations in inlet water, upto 20 mg Cr/l.

The plants operated with a short fill time in comparison with the total cycle time for the SBRprocess have all demonstrated good sludge settling properties, suggesting that the SBR processmay incorporate a good sludge selection performance.

Once a flexible operation strategy has been installed (in most cases through PLC systems) it hasbeen possible to meet load variations to maintain good treatment results. This has been found tobe true for most of the plants included in the thesis.

Finally, a modified way to assess the energy efficiency for the system is analysed and suggested.Instead of using the traditional ratio kWh/kg BODremoved the use of kWh/kg OCPremoved as a basisfor energy efficiency is used as a far more relevant efficiency measurement.

Ort, förlag, år, upplaga, sidor
Stockholm: KTH, 2009. s. xviii, 63
Serie
Trita-LWR. PHD, ISSN 1650-8602 ; 1050
Nyckelord
Intermittent operation, Water temperature, nitrogen, phosphorus, SBR, reaction rates
Nationell ämneskategori
Annan naturresursteknik
Identifikatorer
urn:nbn:se:kth:diva-10550 (URN)978-91-7514-341-5 (ISBN)
Disputation
2009-06-03, Sal F3, Lindstedtsvägen 26, KTH, Stockholm, 10:00 (Engelska)
Opponent
Handledare
Anmärkning
QC 20100803Tillgänglig från: 2009-05-26 Skapad: 2009-05-26 Senast uppdaterad: 2010-08-03Bibliografiskt granskad

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