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| Microalgae-biochar coupled system for swine manure biogas slurry treatment in cold regions |
| Received:June 11, 2025 |
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| KeyWord:low-temperature microalgae;Chlamydomonas;biochar;pig manure biogas slurry;ammonium nitrogen;total phosphorus |
| Author Name | Affiliation | E-mail | | WANG Huiyue | College of Water Resources and Civil Engineering, China Agricultural University, Beijing 100083, China | | | WANG Cuicui | College of Water Resources and Civil Engineering, China Agricultural University, Beijing 100083, China | | | MA Dingna | College of New Energy and Environment, Jilin University, Changchun 130021, China | | | LU Haifeng | College of Water Resources and Civil Engineering, China Agricultural University, Beijing 100083, China
Key Laboratory of Agricultural Engineering in Structure and Environment, Ministry of Agriculture and Rural Affairs, Beijing 100083, China | haifenglu@cau.edu.cn | | LI Baoming | College of Water Resources and Civil Engineering, China Agricultural University, Beijing 100083, China
Key Laboratory of Agricultural Engineering in Structure and Environment, Ministry of Agriculture and Rural Affairs, Beijing 100083, China | | | WANG Chaoyuan | College of Water Resources and Civil Engineering, China Agricultural University, Beijing 100083, China
Key Laboratory of Agricultural Engineering in Structure and Environment, Ministry of Agriculture and Rural Affairs, Beijing 100083, China | |
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| Abstract: |
| To address the issue of low treatment efficiency when using microalgae to treat anaerobic digestate in cold regions, this study uses the low-temperature Chlamydomonas strain previously screened as the test algae species. Hydrochar and pyrochar, prepared from various raw materials, were used as adsorbents, with pig manure anaerobic fermentation digestate as the test wastewater. The microalgaebiochar coupling system was investigated for its enhanced treatment effect on pollutants in digestate at 15 ℃. The results showed that the optimal process conditions for Chlamydomonas and biochar alone in treating pig manure digestate were: a digestate dilution of 1.25% (corresponding to 50 mg·L-1 NH + 4-N), with pyrochar and hydrothermal biochar added at 5 g·L-1 and 2 g·L-1, respectively. When the initial inoculation of Chlamydomonas was 80 mg·L-1, the microalgae-biochar coupling system significantly enhanced the pollutant removal rate after 4 days. Pyrochar was effective in removing NH4+-N, with removal rates ranging from 51.76% to 79.57% in the Chlamydomonas-pyrochar coupling system, which was 180.45%-331.19% and 268.58%-608.28% higher than those of the Chlamydomonas-only treatment and the pyrochar-only treatment, respectively. Hydrothermal biochar, on the other hand, was effective in removing total phosphorus(TP), with the highest TP removal rate reaching 76.19% in the Chlamydomonas-straw hydrothermal biochar coupling system, which was 41.33% higher than the Chlamydomonas-only treatment and 244.90% to 474.59% higher than the independent hydrothermal biochar treatment (-52.58% to 13.26%). In addition, biochar significantly increased the microalgae's photosynthetic pigment content and resistance to low-temperature stress. This study demonstrates that the microalgae-biochar coupling system can synergistically enhance pollutant removal and system stability under low-temperature conditions. |
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