Acta Univ. Agric. Silvic. Mendelianae Brun. 2018, 66, 23-28

https://doi.org/10.11118/actaun201866010023
Published online 2018-02-28

Primary and Activated Sludge Biogas Production: Effect of Temperature

Tereza Dokulilová1, Tomáš Vítěz1, Jan Chovanec1, Robert Rous1, Monika Vítězová2, Ivan Kushkevych2

1Department of Agricultural, Food and Environmental Technology, Faculty of AgriSciences, Mendel university in Brno, Zemedelska 1, 613 00 Brno, Czech Republic
2Section of Microbiology and Molecular Biotechnology, Department of Experimental Biology, Faculty of Science, Masaryk University, Kotlarska 2, 602 00 Brno, Czech Republic

Sewage sludge management is a problem of growing importance. Anaerobic sewage sludge stabilization is commonly used technology, where organic matter contained in primary and activated sewage sludge is converted into biogas, so both, pollution control and energy recovery can be achieved. The paper deals with the effect of process temperature (36 °C, 42 °C and 50 °C) on biogas production and quality during anaerobic stabilization of primary and activated sewage sludge generated during purifying process in low‑loaded activated sludge process. Primary and activated sewage sludge samples were taken at the wastewater treatment plant Brno, Czech Republic. The characteristics of sludges (dry matter and organic dry matter content, pH, conductivity, redox potential) were dermined. Biogas production and quality was measured using 3 anaerobic systems, each of 8 batch anaerobic fermenters, at the 3 different temperature conditions 36 °C, 42 °C and 50 °C. Hydraulic retention time was 20 days. Hypothesis, which predicts that the fermentation of primary and activated sludge provides dissimilar methane quantity and quality under different temperature conditions (36 °C, 42 °C and 50 °C), was partially confirmed. Temperature 42 °C significantly increased biogas production from primary sewage sludge (by 60 % in comparison with production at 36 °C). For activated sewage sludge samples no significant influence of temperature on the biogas production was observed.

Funding

This study was financed by the Internal Grant Agency of the Faculty of AgriSciences Mendel University in Brno [IP­ 17 / 2016]; Influence of toxic substances on the sewage sludge anaerobic stabilization and biogas production. The authors thank to Mr. Robert Hrich chief technologist of WWTP Brno, Czech Republic for his kind collaboration during the research.

References

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