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| Feasibility study on the treatment of low C/N digested animal manure with shortcut nitrification-denitrification process |
| Received:March 18, 2016 |
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| KeyWord:nitrogen removal;nitrite;animal manure;nitrification-denitrification |
| Author Name | Affiliation | | HE Qing-ming | Taizhou University, Taizhou 225300, China
Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, Chongqing University, Chongqing 400045, China | | LI Ting-you | Taizhou University, Taizhou 225300, China | | WEI Ping-he | Taizhou University, Taizhou 225300, China |
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| Abstract: |
| Traditional digested animal manure has some problems such as low C/N and poor biodegradability, thus shortcut nitrification-denitrification was suggested to deal with the manure. Our study showed that by controlling DO concentration within the range of 0.6~0.9 mg·L-1, seeding the reactor with anaerobic ammonia oxidation granulated sludge to achieve a stable nitrite accumulation under(29±1)℃ could realize partial nitrification-denitrification quickly. Then we kept DO concentration within the range of 0.1~2.88 mg·L-1 under constant aeration, and the best nitrite accumulation and NH4+-N removal efficiency was observed when pH at 8 and FA at 18 mg·L-1, a condition more conducive to nitrite bacteria for competitive advantage and long-term stability to achieve shortcut nitrification-denitrification, through the comparison of four different groups. Moreover, the quantitative ratio of ammonia-oxidizing bacteria(AOB) to nitrite-oxidizing bacteria(NOB) was 600:1. During the stabilized flow of the anaerobic digestion fluid into the SBR, the loading rates of COD and NH4+-N were 2.0~3.5 kg·m-3·d-1 and 0.6~0.8 kg·m-3·d-1, with the removal rates of COD and NH4+-N for 63%~71% and 94.9%, respectively. And the nitrite accumulation rate reached more than 94.25%. |
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