The performance of biochar-mediated anaerobic digestion of chicken manure
PAN Jun-ting1, MA Jun-yi1, QIU Ling1,2, GOU Xiao-hui1,2, GAO Tian-lei2
1. College of Mechanical and Electronic Engineering, Northwest A & F University, Yangling 712100, China;
2. The West Scientific Observing and Experimental Station of the Rural Renewable Energy Exploitation and Utilization of Ministry of Agriculture, Yangling 712100, China
Different dosages of biochar (20%, 15%, 10%, 5% and 0%; on a dry weight basis) were added to the anaerobic digestion (AD) of chicken manure to investigate its effects on AD performance under mesophilic condition (35±1)℃. The same amount of chicken manure (14.21g, on a Volatile Solid-VS basis) and initial inoculum concentration (30%, v/v) were employed in all experiments. The microstructure of biochar and the morphology of predominant microorganisms associated with biochar were also observed in this study using a scanning electron microscopy (SEM). The results showed that the specific cumulative methane production (SCMP, mL/gVS chicken manure) could be obviously increased with external biochar addition. The SCMP under biochar dosages of 20%, 15%, 10% and 5% were around 223, 228, 230 and 281mL/gVS respectively, much higher than that of the control experiment (202mL/gVS). Moreover，biochar addition could improve the biogas quality by increasing its methane content and decreasing its carbon dioxide and hydrogen sulfide contents. The optimum biochar dosage for biochar-mediated anaerobic digestion of chicken manure was around 5%. The SEM observations revealed that abundant microbes attached to the biochar; and bacillus and coccus were shown to be the dominant microorganisms.
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