The effects of temperature and duration of thermal pretreatment on the solid-state anaerobic digestion of dairy cow manure

Heliyon
Wilton P A McVoitte, O Grant Clark

Abstract

Cellulosic substrates such as dairy cow manure often yield low volumes of biogas and low concentrations of methane when digested anaerobically. Thermal pretreatment of dairy cow manure was investigated to determine if pretreatment temperature and duration can be optimized to maximize biogas yield and methane concentration. A central composite rotatable design was used to select combinations of temperature and duration. Based on measured data, statistical models were generated to estimate the biogas yield and methane concentration during digestion. The highest biogas yields were from the untreated samples and samples treated at the center temperature and duration of the statistical model (125 °C, 37.5 min). The model predicted the optimum pretreatment conditions of 140 °C for 30 minutes. Under the conditions of this experiment, temperature and duration had no significant effect on the biogas yield and methane concentration. This lack of significance may indicate that thermal pretreatment may be an unnecessary step in the anaerobic digestion of dairy cow manure, which could reduce capital and operating costs for the industry.

Citations

Feb 20, 2020·Environmental Technology·Iván LópezLiliana Borzacconi
Mar 16, 2021·The Science of the Total Environment·Vempalli Sudharsan VarmaGreg Thoma

❮ Previous
Next ❯

Methods Mentioned

BETA
thermal treatments

Software Mentioned

SAS

Related Concepts

Related Feeds

Biofuels (ASM)

Biofuels are produced through contemporary processes from biomass rather than geological processes involved in fossil fuel formation. Examples include biodiesel, green diesel, biogas, etc. Discover the latest research on biofuels in this feed.