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| Stimulation mechanisms of trace elements selenium and tungsten on anaerobic fermentation of swine manure |
| Received:October 29, 2019 |
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| KeyWord:swine manure;trace elements;anaerobic fermentation;effect;methane production potential;kinetic analysis |
| Author Name | Affiliation | E-mail | | CHEN Biao | Institute of Agricultural Engineering Technology, Fujian Academy of Agricultural Science, Fuzhou 350003, China | | | GUO Shao-ying | Fujian Provincial Key Laboratory of Eco-Industrial Green Technology, Wuyi University, Wuyishan 354300, China | | | CHEN Fang | Fujian Provincial Key Lab of Coastal Basin Environment, Fujian Polytechnic Normal University, Fuqing 350300, China | | | HUANG Jing | Institute of Agricultural Engineering Technology, Fujian Academy of Agricultural Science, Fuzhou 350003, China | | | XIAO Yan-chun | Institute of Agricultural Engineering Technology, Fujian Academy of Agricultural Science, Fuzhou 350003, China
Fujian Provincial Key Lab of Coastal Basin Environment, Fujian Polytechnic Normal University, Fuqing 350300, China | 523913032@qq.com |
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| Abstract: |
| To understand the effects of trace elements on the anaerobic fermentation system and improve the biomethanation efficiency, this study added trace elements Se and W to a pig manure fermentation substrate. The first-order kinetic model and the Gompertz model were used to simulate the anaerobic fermentation process. Results showed that moderate additions of the trace elements Se and W positively affected methanogenesis. The most significant stimulating effect was found in the M group(after adding 0.8 mg·L-1 Se and 1.8 mg·L-1 W). The cumulative biogas production, methane volume fraction, and methane yield(in terms of VS)were 177 001 mL, 68.3% and 398.3 mL·g-1, which were 10.2%, 6.1% and 21.4% higher than those of the CK group, respectively. Further correlation analysis revealed that the addition of trace elements could effectively improve the conversion rate of total volatile fatty acids(TVFAs), particularly for propionic acid. Further, the concentration of TVFAs was negatively correlated with the methane yield. The M group showed the lowest TVFA accumulation(809 mg·L-1) and the highest methane production rate(31.0 mL·g-1·d-1). Moreover, the hydraulic retention time(HRT)was 4 d shorter and the BDA increased by 21.4% compared to the CK group. The anaerobic fermentation process was best fitted by the Gompertz model(R2=0.999 2). |
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