Benefit Analysis of Hydrothermal Processing of Biogas Slurry Applied to Biogas Power Generation Project

Abstract

Taking a large-scale anaerobic fermentation biogas power generation project as an example, the biogas slurry was hydrothermal processed and then reused to the anaerobic reactor, so as to reduce the biogas slurry discharge and increase the biogas production. The benefit analysis is carried out on the basis of meeting the requirements of increasing the gas production and the economic benefit as far as possible in the biogas power generation project. Through analyzing the amount of biogas slurry returning to field, the increase of biogas production, and the ammonia nitrogen concentration of the material in the anaerobic reactor, it is concluded that the reasonable amount of hydrothermal processing in this project is 150 t⋅d−1∼200 t⋅d−1 (the ratio of the hydrothermal processing capacity to the material in the anaerobic reactor is 22.4% ∼ 29.9%), which can increase the biogas production to 338.2 Nm3⋅d-1 ∼346.6 Nm3⋅d-1 per ton of dry solid.