Effects of Carbon to Nitrogen Ratio on Anaerobic Co-digestion by Mixing Human Manure with Straw in Rural Areas
WANG Qiuyuan
ZHANG Tiejian
ZHANG Liyong
LI Meichun
ZHOU Biao
LIU Junliang
WU Yongkai
Abstract：Human manure and straw production is huge,and the lack of effective treatment and disposal methods would cause pollution to the environment.In order to further study the effect of carbon to nitrogen ratio on the anaerobic co-diges-tion experiment by mixing human manure with straw in rural Hebei Province,the anaerobic co-digestion experiment of corn straw and wheat straw soaked in human manure and biogas slurry was carried out under three gradients of carbon to nitrogen ratio of 20/1,25/1 and 30/1,respectively.The changes of gas content and pH,NH4+-N,VFAs and COD of biogas slurry during the experiment were analyzed.In terms of gas production performance,the experimental group with a carbon to nitro-gen ratio of 20/1 had better gas production.The fermentation of human manure with corn straw was better than that of human manure with wheat straw.In terms of fermentation feed and liquid characteristics,the experimental group with a carbon to nitrogen ratio of 20/1 had moderate changes in fermentation feed and liquid indexes,more stable fermentation process and higher buffering capacity.The experimental group with human manure and wheat straw mixed anaerobic co-digestion had more buffering capacity and more stable fermentation process than the experimental group with human manure and corn straw mixed anaerobic co-digestion.Therefore,the carbon to nitrogen ratio of 20/1 is more suitable for human manure and straw mixed anaerobic co-digestion experiment.
Keywords：human manurestrawanaerobic co-digestioncarbon to nitrogen ratio
Publication Date：2023-12-28
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：8( 101-108 )