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| Effect of biomass fly ash addition on methane production in two-phase anaerobic digestion of food waste |
| Received:November 02, 2017 |
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| KeyWord:food waste;two-phase anaerobic digestion;biomass fly ash;organic loading rate |
| Author Name | Affiliation | E-mail | | HUANG Hong-hui | College of Natural Resources and Environment of South China Agriculture University, Guangzhou 510642, China | | | WANG De-han | College of Natural Resources and Environment of South China Agriculture University, Guangzhou 510642, China | dehanwang@scau.edu.cn | | LUO Zi-feng | College of Natural Resources and Environment of South China Agriculture University, Guangzhou 510642, China | | | SHANG Wei-hui | Guangdong Huayang Environmental Protection Science and Technology Ltd., Zhaoqing 526300, China | |
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| Abstract: |
| Limitations on the traditional utilization of biomass fly ash(BFA) in agriculture have been noticed as a long-standing issue. A new approach to reusing BFA is required. Additionally, the accumulation of volatile fatty acids(VFAs) occurring in the sole food waste anaerobic digestion process frequently made digestion fail. This paper focused on the performance of anaerobic digestion(AD) of food waste by adding BFA in a two-phase process at(35±1)℃. Varied loads of BFA were added into the acidogenic reactor. The results showed that BFA could significantly accelerate the acidification and increase the pH value in the acidogenic reactor. The VFA concentration in the acidogenic reactor with 3% BFA was 9 845.45 mg·L-1, increasing by 49.66% compared to the control reactor. The total methane yield in the AD process with 3% BFA was 490.33 mL·g-1 VS, which was 22.49%, 12.35%, 6.36%, and 8.22% higher than that in the digestion system loading with 0%, 1%, 4%, and 5% BFA, respectively. This work indicates that BFA could accelerate the acidification in the acidogenic phase and increase the methane yield in the methanogenic phase. It could be helpful to prevent short-circuiting in current AD processes with high organic loads. |
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