Kinetics of temperature effects and its significance to the heating strategy for anaerobic digestion of swine wastewater

Abstract - The effects of temperature on biogas production and the heating strategy for anaerobic digestion of swine wastewater were investigated. Through a kinetic model, the maximum volumetric rate of biogas production (Rpmax) for digestion at 15, 20, 25, 30, and 35 °C were found to be 0.282, 1.189, 1.464, 1.789, and 2.049 L L−1 d−1, respectively. The temperature–activity coefficient of Rpmax was 1.332 at 15–20 °C, 1.043 at 20–25 °C, 1.041 at 25–30 °C, and 1.028 at 30–35 °C. Anaerobic digestion appeared to be more sensitive to temperature variation within 15–20 °C than to variation within 20–35 °C. In terms of energy input–output ratio and total annual cost, the optimal heating strategy is an increase in the fermentation temperature from 15 to 20 °C.

Deng, L., H. Yang, G. Liu, D. Zheng, Z. Chen, Y. Liu, X. Pu, L. Song, Z. Wang, & Y. Lei (2014) Kinetics of temperature effects and its significance to the heating strategy for anaerobic digestion of swine wastewater, APPLIED ENERGY 134:349-355.