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| Effects of biochar/persulfate on changes of carbon and nitrogen components in biogas slurry |
| Received:August 20, 2024 |
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| KeyWord:biogas slurry;biochar/persulfate;carbon and nitrogen components;seed germination index |
| Author Name | Affiliation | E-mail | | LI Shiqi | College of Resources and Environmental Sciences, Southwest University, Chongqing 400716, China
Chongqing Engineering Research Center of Rural Cleaner Production, Key Laboratory of Agricultural Soil Pollution Risk Control of Eco-Environmental Agricultural Land, Chongqing 400716, China | | | LIU Xin | College of Resources and Environmental Sciences, Southwest University, Chongqing 400716, China | | | KONG Fanjing | College of Resources and Environmental Sciences, Southwest University, Chongqing 400716, China | | | YANG Zhimin | College of Resources and Environmental Sciences, Southwest University, Chongqing 400716, China
Chongqing Engineering Research Center of Rural Cleaner Production, Key Laboratory of Agricultural Soil Pollution Risk Control of Eco-Environmental Agricultural Land, Chongqing 400716, China | | | CHEN Yucheng | College of Resources and Environmental Sciences, Southwest University, Chongqing 400716, China
Chongqing Engineering Research Center of Rural Cleaner Production, Key Laboratory of Agricultural Soil Pollution Risk Control of Eco-Environmental Agricultural Land, Chongqing 400716, China | 372505096@qq.com |
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| Abstract: |
| In order to investigate the effect of biochar/persulfate on mineralization of organic matter in different molecular weight range and seed germination index in biogas slurry, biochar/ persulfate oxidation tests were carried out. The results showed that compared with the original biogas slurry treatment, the addition of 1.8 g·L-1 potassium persulfate and 2.0 g·L-1 biochar could maintain the total nitrogen concentration of biogas slurry and significantly increase the dissolved organic nitrogen concentration by 82.20%（187.43 mg·L-1）. The content of particulate organic matter（35.77 mg·L-1）was decreased by 59.11%, and the germination index was increased by 46.17%. Importance analysis showed that oxidation time and dissolved organic matter with molecular weight less than 10 kDa were the main factors affecting bioavailability of biogas slurry, and their relative importance was 0.29 and 0.18, respectively. The results showed that 1.8 g·L-1 potassium persulfate and 2.0 g·L-1 biochar could efficiently mineralize refractory organic matter, improve seed germination index, and reduce stable time of biogas slurry, which could provide theoretical basis for the safe utilization of biogas slurry. |
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