@ARTICLE{Dauknys_Regimantas_Evaluation_2024,
 author={Dauknys, Regimantas and Mažeikiene, Aušra and Paliulis, Dainius},
 volume={50},
 number={5},
 pages={82-92},
 journal={Archives of Environmental Protection},
 howpublished={online},
 year={2024},
 publisher={Polish Academy of Sciences},
 abstract={An additive based on iron oxides was applied to reduce the amount of produced sludge and to increase the production and quality of biogas. The C/N ratio was 11.0–11.3 and the pH of the sludge mixture was 7.3 before the anaerobic digestion. The determined optimal dose of the additive was 0.35 g/g of sludge dry matter over 20 days. This allowed a reduction in the sludge retention time up to 6–11 days. Consequently, maximum biogas production was reached on average 1.6 times faster, volatile solids degradation increased by 56.7%, biogas production increased by 75%, specific biogas production increased by 11.5%, and methane concentration in the biogas increased by 8.4%–18.2%. When the additive was applied, the quantity of phosphate phosphorus in the supernatant was reduced by up to 19%, and hydrogen sulfide reduction efficiency in the biogas ranged between 55% and 62%. In sludge treatment facilities, using an iron oxide-based additive could reduce the dewatering and drying costs for digested sludge by up to 35% .},
 title={Evaluation of additive effecton anaerobic sewage sludge digestion},
 type={Article},
 URL={http://journals.pan.pl/Content/133563/PDF-MASTER/Archives50no4pp82_92.pdf},
 doi={10.24425/aep.2024.152898},
 keywords={additive;, iron;, sludge digestion;, biogas production;, methane;, cost-efficient},
}