Abstract
Abstract To improve the biogas potential in anaerobic digestion of cattle manure in cold regions, we investigated, in this study, the potential of the anaerobic digestion of cattle manure through sequencing batch anaerobic digestion experiments at sub-mesophilic temperatures (15°C, 20°C, 25°C, and 37°C) for 50 days. Specifically, the changes in the biogas yield, pH, sCOD concentration, enzyme activity, and microbial community structure were examined. The maximum daily yield of biogas was 19.18 mL·gVS−1, which was recorded on day 6 at 37°C, and the final biogas accumulation yield at this temperature was 403.64 mL·gTS−1. The concentration of sCOD gradually increased as enzyme activity increased. The maximum activities of cellulase, hemicellulase, protease, and amylase were recorded in the 37°C experimental group. The decrease in temperature severely limited the activity of different types of enzymes, resulting in a decrease in the activity of microorganisms, which greatly influenced the methanogenic reaction. The dominant bacteria at the phylum level were Bacteroidetes and Proteobacteria, and the dominant methanogen at the genus level was Methanosaeta.
Highlights
With the strategic adjustment and industrialization promotion of China’s agricultural structure, the livestock industry has changed from small scale and scattered management to large scale and intensive production, which results in an increase in livestock manure production year by year and distribution is getting more concentrated [1]
The results showed that ultrasonic pretreatment can enhance the chemical oxygen demand removal rate by 10%, as well as the biogas production increased from 0.20 to 0.45 L·day−1, and the biogas concentration increased by 10% on average
To improve the biogas yield in the anaerobic digestion of cattle manure in cold regions and the stability of the anaerobic digestion process, in this study, we examined the variation of daily and cumulative biogas yields in the anaerobic digestion of cattle manure at sub-mesophilic temperatures
Summary
With the strategic adjustment and industrialization promotion of China’s agricultural structure, the livestock industry has changed from small scale and scattered management to large scale and intensive production, which results in an increase in livestock manure production year by year and distribution is getting more concentrated [1]. Untreated or poorly treated cattle manure pollutes soil, water, and air and adversely affects the animals themselves. Cattle manure is a readily available and highly accessible source of biomass. Against the backdrop of China’s increasing energy demand and greater emphasis on environmental protection, there is an urgent need to improve the treatment of livestock manure to reduce its negative impacts and further explore its potential as a source of renewable energy. It is imperative to promote the sustainable and healthy development of the renewable energy industry
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