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| Recovery of ammonia nitrogen from biogas slurry of digested livestock manure using indigenous tubular gaspermeable membrane |
| Received:April 24, 2021 |
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| KeyWord:livestock manure;biogas slurry;ammonia nitrogen;recovery;gas-permeable membrane |
| Author Name | Affiliation | E-mail | | LI Peng | Institute of Plant Nutrition, Resources and Environment, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100097, China
China-New Zealand Joint Laboratory of Water Environment Research, Beijing 100097, China | | | GUO Xuan | Institute of Plant Nutrition, Resources and Environment, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100097, China
China-New Zealand Joint Laboratory of Water Environment Research, Beijing 100097, China | | | ZHONG Hua | Institute of Plant Nutrition, Resources and Environment, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100097, China
China-New Zealand Joint Laboratory of Water Environment Research, Beijing 100097, China | | | ZHAO Tongke | Institute of Plant Nutrition, Resources and Environment, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100097, China
China-New Zealand Joint Laboratory of Water Environment Research, Beijing 100097, China | | | LI Jijin | Institute of Plant Nutrition, Resources and Environment, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100097, China | | | WANG Jiachen | Institute of Plant Nutrition, Resources and Environment, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100097, China | | | ZHANG Chengjun | Institute of Plant Nutrition, Resources and Environment, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100097, China
China-New Zealand Joint Laboratory of Water Environment Research, Beijing 100097, China | Zhangcj68@163.com |
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| Abstract: |
| Dynamic experimental studies were conducted to explore the feasibility and practicality of recovering ammonia nitrogen from biogas slurry of livestock manure using an experimental device configured by an indigenous tubular gas-permeable membrane. The results showed that the ammonia nitrogen content in the biogas slurry decreased significantly, whereas the ammonia nitrogen content in the extract solution increased linearly and then stabilized at a high level. After 396 h of device operation, 91.2% of the ammonia nitrogen in the biogas slurry was removed. Based on the variations in the ammonia recovery velocity, the operating time of the device was divided into two stages, the ammonia recovery stage(0~252 h) and the ammonia loss stage(252~420 h). At the ammonia recovery stage, the ammonia nitrogen content of the extracted solution was <10 000 mg·L-1 and the average ammonia nitrogen recovery velocity per unit volume was 1 190 mg·L-1·d-1. At the ammonia loss stage, the ammonia nitrogen content of the extracted solution remained stable ranging from 11 200 to 12 180 mg·L-1, and the average ammonia nitrogen recovery velocity per unit volume was 35 mg·L-1·d-1. For efficient ammonia extraction, it is recommended to keep the biogas slurry reaction tank airtight to reduce the volatilization of gaseous NH3. Additionally, when the pH of the extract exceeds 7, it can be used as an indicator for replacing the extract solution with a fresh solution. Ammonia nitrogen could be effectively recovered from biogas slurry using an indigenous tubular gas-permeable membrane with a recovery efficiency of about 80%. |
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