Science – Future of Lithuania / Mokslas – Lietuvos Ateitis, Vol 2, No 5 (2010)

The Impact of Chemical Phosphorus Removal on the Process of Anaerobic Sludge Digestion

Svetlana Ofverstrom
Ieva Sapkaitė
Regimantas Dauknys


The paper investigates the efficiency of the mixture of primary sludge and excess activated sludge in Vilnius WWTP with reference to the anaerobic digestion process. Sludge digestion was carried out under laboratory conditions using anaerobic sludge digestion model W8 (Armfield Ltd., UK). Laboratory analyses consist of two periods – the anaerobic digestion of the un-dosed and Fe-dosed sludge mixture. The results of digestion were processed using the methods of statistical analysis. The findings showed reduction in volatile solids approx. by 6% when dosing min FeCl3·6H2O and 15% when dosing max FeCl3·6H2O into feed sludge. Gas volume produced during the digestion of the un-dosed sludge was 90–160 ml/d and 60–125 ml/d in min Fe-dosed sludge and 45-95 ml/d. Also, correlation between VS loadings and biogas production was found. A rise in VS loading from 0,64 g/l/d to 1,01 g/l/d increased biogas production from 90 ml/d to 140–160 ml/d.

Article in Lithuanian

Article in: Lithuanian

Article published:

Keyword(s): anaerobic digestion; chemical phosphorus removal; biogas; iron salt

DOI: 10.3846/mla.2010.094

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Science – Future of Lithuania / Mokslas – Lietuvos Ateitis ISSN 2029-2341, eISSN 2029-2252
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