Abstract
This paper performs a batch experiment for pre-acidification treatment and methane production from chicken manure by the two-stage anaerobic fermentation process. Results shows that the acetate was the main component in volatile fatty acids produced at the end of pre-acidification stage, accounting for 68% of the total amount. The daily biogas production experienced three peak period in methane production stage, and the methane content reached 60% in the second period and then slowly reduced to 44.5% in the third period. The cumulative methane production was fitted by modified Gompertz equation, and the kinetic parameters of the methane production potential, the maximum methane production rate and lag phase time were 345.2 ml, 0.948 ml/h and 343.5 h, respectively. The methane yield of 183 ml-CH4/g-VSremovedduring the methane production stage and VS removal efficiency of 52.7% for the whole fermentation process were achieved.
Highlights
As the amount of the large scale livestock and poultry farms increased in China, the discharged manure increased and the environment pollution caused by manure became prominent gradually in recent years
Statistics suggested that the chemical oxygen demand (COD) and the ammonium nitrogen (NH4+-N) produced from livestock and poultry manure in China reached to 10.99 and 0.63 million ton, respectively, accounting for 45% and 25% of the summation discharged into environment nationwide, and being equivalent to 95% and 78% of the summation produced by agricultural resources [1]
Two-stage fermentation process with pre-acidification stage and subsequence methane production stage was utilized in this study, and the component of volatile fatty acids (VFAs), methane yield and volatile solid (VS) removal efficiency were investigated to estimate the fermentation efficiency of chicken manure
Summary
As the amount of the large scale livestock and poultry farms increased in China, the discharged manure increased and the environment pollution caused by manure became prominent gradually in recent years. The organic matters and nitrogen in chicken manure are the valuable biomass resource, and they could be reused and transferred into resources and energy materials by some recycle technologies. Among all kinds of livestock and poultry manure, chicken manure contains relatively high content of nitrogen as well as the low carbon to nitrogen ratio (C/N), which is more likely to cause severe inhibition effect as the fermentation substrate [5]. The simplest measure to reduce the reverse effects of NH4+-N on methanogens is diluting chicken manure with water by the application of wet anaerobic fermentation process. Two-stage fermentation process with pre-acidification stage and subsequence methane production stage was utilized in this study, and the component of volatile fatty acids (VFAs), methane yield and volatile solid (VS) removal efficiency were investigated to estimate the fermentation efficiency of chicken manure
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