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| Solid-state anaerobic digestion of pig manure with three kinds of additives |
| Received:May 27, 2019 |
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| KeyWord:solid-state anaerobic digestion;biogas production;pig manure;additives;acid inhibition |
| Author Name | Affiliation | E-mail | | LI Dan-ni | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | ZHANG Ke-qiang | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | LIANG Jun-feng | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | GAO Wen-xuan | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | KONG De-wang | Hangzhou Energy Environmental Engineering Ltd, Hangzhou 310020, China | | | DU Lian-zhu | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | dulianzhu99@163.com |
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| Abstract: |
| In order to avoid acid inhibition and improve biogas production of solid-state anaerobic digestion (SS-AD), the effect of various additives (vermiculite, sepiolite, biochar) and addition dosages (5%, 10%, 15%, 20%) on the acid concentrations and biogas yields in SSAD process was investigated under 37℃ with pig manure as substrate. The results showed that the mass concentration of TVFAs decreased with the increase of the added proportion of vermiculite and biochar, and decreased rapidly after 25th day. Compared with biochar and vermiculite, there was no significant difference in TVFAs concentrations for different proportions of added sepiolite. Compared with SS-AD of pig manure without any additive, the lag phase of different biochar (P-C) addition ratio could be shortened by 31.23% to 83.90%. At a 10% addition ratio of addivite, vermiculite, sepiolite and biochar increased the cumulative specific methane yield (SMY) rate by 98.97%, 76.78% and 93.06% respectively. When the addition ratio increased to 20%, the SMY reached at 3.62 mL·g-1, 2.87 mL·g-1 and 3.15 mL·g-1, and the cumulative SMY were 106.38 mL·g-1, 106.68 mL·g-1 and 126.23 mL·g-1 respectively. The addition of vermiculite, sepiolite and biochar could alleviate the acid inhibition and increase the methane yield in SS-AD process with pig manure as substrate, and the effect of biochar was superior to that of vermiculite and sepiolite. |
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