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| Fast startup and stable operation of partial nitrification and denitrification using pig manure straw biogas slurry |
| Received:November 16, 2020 |
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| KeyWord:biogas slurry;partial nitrification and denitrification process;ammonia oxidation inoculant;denitrification inoculant;rapid start-up |
| Author Name | Affiliation | E-mail | | GAO Xing-dong | Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu 610041, China
School of Resources and Environment, Mianyang Teachers′ College, Mianyang 621000, China | | | CHEN Yang-wu | Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu 610041, China | | | FU Shi-yu | Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu 610041, China | | | DONG Shi-yang | Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu 610041, China | | | ZHOU Hou-zhen | Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu 610041, China | | | LUO Ya-jun | School of Resources and Environment, Mianyang Teachers′ College, Mianyang 621000, China | | | TAN Zhou-liang | Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu 610041, China | tanzhl@cib.ac.cn |
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| Abstract: |
| The partial nitrification and denitrification process has several advantages such as carbon source and aeration energy saving and a low sludge yield, but its engineering application is limited due to its long startup time and unstable short cut nitrification performance. To solve this problem, an Integrated Fixed-Film Activated Sludge(IFAS) system was used to treat the biogas slurry of pig manure and straw, and the rapid startup and stable operation effects of short cut nitrification and denitrification with bioaugmentation were investigated. Results showed that the rapid startup of short cut nitrification and denitrification could be achieved within 17 days by adding laboratorymade ammonia oxidation and denitrification agents. During stable operation, the average organic loading rate of pig manure and straw biogas slurry was 1 040.0 mg·L-1·d-1, average NH3-N loading rate in the aerobic tank was 110 mg·L-1·d-1, and the average NO2--N accumulation rate in the aerobic tank was 91.4%. The removal rates of COD, NH3-N, and TN of the biogas slurry were reached at 92.1%, 97.0% and 90.1%, respectively, and the removal of COD and TN mainly occurred in the anoxic tank. During the whole operation period, molecular biology analysis showed that the abundance of Ammonia Oxidizing Bacteria(AOB) in aerobic tank biofilms increased from 0.003 6% to 0.014 3%(four times higher), and Nitrite Oxidizing Bacteria(NOB) abundance decreased from 0.004 8% to 0. This study shows that the rapid start and stable operation of partial nitrification and denitrification can be achieved using ammonia oxidation and denitrifying agents as inoculants. |
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