Effect of Low-Temperature Conditioning of Excess Dairy Sewage Sludge with the Use of Solidified Carbon Dioxide on the Efficiency of Methane Fermentation

This study aimed to determine the effect of the low-temperature conditioning of excess dairy sewage sludge using solidified carbon dioxide on the efficiency of methane fermentation. An increase in the solidified carbon dioxide to excess dairy sewage sludge volumetric ratio above 0.3 had no significant effect on chemical oxygen demand concentration in the dissolved phase. The highest chemical oxygen demand values, ranging from 490.6 +/- 12.9 to 510.5 +/- 28.5 mg center dot dm(-3), were determined at solidified carbon dioxide to excess dairy sewage sludge ratio ranging from 0.3 to 0.5. The low-temperature conditioning caused ammonia nitrogen concentration to increase from 155.2 +/- 10.2 to 185.9 +/- 11.1 mg center dot dm(-3) and orthophosphates concentration to increase from 198.5 +/- 23.1 to 300.6 +/- 35.9 mg center dot dm(-3) in the dissolved phase. The highest unitary amount of biogas, reaching 630.2 +/- 45.5 cm(3)center dot g o.d.m.(-1), was produced in the variant with the solidified carbon dioxide to excess dairy sewage sludge volumetric ratio of 0.3. Methane content of the biogas produced was at 68.7 +/- 1.5%. Increased solidified carbon dioxide dose did not lead to any significant changes in biogas and methane production. The efficiency of biogas production from unconditioned excess dairy sewage sludge was lower by 43.0 +/- 3.2%. The analysis demonstrated that the low-temperature conditioning is an energetic viable technology aiding the methane fermentation process.

Automated summary

The study found that the highest chemical oxygen demand values were produced with a solidified carbon dioxide to excess dairy sewage sludge ratio ranging from 0.3 to 0.5, while ammonia nitrogen and orthophosphates concentrations also increased. The variant with a solidified carbon dioxide to excess dairy sewage sludge volumetric ratio of 0.3 yielded the highest unitary amount of biogas.