Change search
ReferencesLink to record
Permanent link

Direct link
Performance of an SBR-pla nt for advanced nutrient removal, using septic sludge as a carbon source
2001 (English)In: Water Science and Technology, ISSN 0273-1223, Vol. 43, no 3, 131-138 p.Article in journal (Refereed) Published
Abstract [en]

The Tjustvik SBR-plant outside Stockholm, Sweden has been in operation for four years. The plant has to meet stringent effluent standards, BOD7 < 10 PPM, total N < 15 PPM and total P < 0.3 PPM. The plant is a typical two reactor SBR-plant, sized for about 15 000 inhabitants, During the first year of operation there were difficulties in meeting the P consent level. The difficulties were linked to a deficit of available organic carbon and a secondary phosphorus release. The problem was solved with the addition of septic sludge, in an amount equivalent to about 10,000 to 15,000 inhabitants with respect to the BOD-load. The altered operation resulted in a very stable and good effluent quality from the plant that has been maintained ever since, giving typical discharge levels as follows: BOD7, < 3 mg/l; Total-P, < 0.15 mg/l; Total-N, < 7 mg/l; NH4-N,< 1 mg/l. The change of process saved the community from a major investment in a separate treatment facility for the septic sludge. The stabilisation degree of the waste activated sludge is sufficient to by pass the anaerobic digestion for the time being, In the beginning, the SBR-process stability played an unwanted role during start up as it maintained a secondary phosphorus release for a considerable time. Later the process stability became an asset as the varying loads from the septic sludge addition were handled with very good results.

Place, publisher, year, edition, pages
2001. Vol. 43, no 3, 131-138 p.
Keyword [en]
SBR, nitrogen removal, phosphorus removal, septic sludge, carbon source
National Category
Other Environmental Engineering Water Engineering
URN: urn:nbn:se:kth:diva-14321ISI: 000167944600018OAI: diva2:332219
QC 20100803Available from: 2010-08-03 Created: 2010-08-03 Last updated: 2010-08-03Bibliographically approved
In thesis
1. SBR-technology - use and potential applications for treatment of cold wastewater
Open this publication in new window or tab >>SBR-technology - use and potential applications for treatment of cold wastewater
2009 (English)Doctoral thesis, comprehensive summary (Other academic)
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.

Place, publisher, year, edition, pages
Stockholm: KTH, 2009. xviii, 63 p.
Trita-LWR. PHD, ISSN 1650-8602 ; 1050
Intermittent operation, Water temperature, nitrogen, phosphorus, SBR, reaction rates
National Category
Other Environmental Engineering
urn:nbn:se:kth:diva-10550 (URN)978-91-7514-341-5 (ISBN)
Public defence
2009-06-03, Sal F3, Lindstedtsvägen 26, KTH, Stockholm, 10:00 (English)
QC 20100803Available from: 2009-05-26 Created: 2009-05-26 Last updated: 2010-08-03Bibliographically approved

Open Access in DiVA

No full text

Search in DiVA

By author/editor
Morling, Stig
In the same journal
Water Science and Technology
Other Environmental EngineeringWater Engineering

Search outside of DiVA

GoogleGoogle Scholar
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Total: 32 hits
ReferencesLink to record
Permanent link

Direct link