Usage of hydrolytic enzymes for anaerobic digestion optimization in a wastewater treatment plant
- Authors: Sabina Kolbl
- Citation: Acta hydrotechnica, vol. 28, no. 48, pp. 65-76, 2015.
- Abstract: We investigated the effects of adding two types of hydrolytic enzymes to wastewater sludge in the process of anaerobic digestion and the dynamics of methane formation in mesophilic temperature range of 37 °C. Metane potential of wastewater treatment plants sludge was 319 ± 11 mL CH4 g-1 OS-1. By adding Micropan Biogas enzymes, methane potential increased by 8% (339 ± 11 mL CH4 g-1 OS-1). After adding Novozymes enzymes, the increase was 45% (455 ± 28 mL CH4 g-1 OS-1). Other physico-chemical parameters remained within the stable and optimal range of anaerobic digestion. Hydrolysis coefficients in the case of enzymes addition were higher than in the control reactors. Furthermore, we evaluated the fit of modified Gompertz, Logistic and Transfer models to the measured values in anaerobic batch reactors. The best model fit was achieved with the Transfer model followed by Gompertz and Logistic models. The cost of enzyme addition would be reimbursed at 8% higher production of methane.
- Keywords: anaerobic digestion, enzymes, model, optimization
- Full text: a48sk.pdf
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