|
| Ammonia and greenhouse gas mitigation from biogas slurry storage using a modified expanded vermiculite cover |
| Received:September 15, 2020 |
| View Full Text View/Add Comment Download reader |
| KeyWord:ammonia;greenhouse gas;mitigation;modified expanded vermiculite;cover |
| Author Name | Affiliation | E-mail | | WANG Yue | Institute of Plant Nutrition and Resources, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100097, China | | | LIU Jing-yi | Urban Construction School, Beijing City University, Beijing 101399, China | | | ZHANG Jia-nan | Institute of Plant Nutrition and Resources, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100097, China | | | GUO He | Urban Construction School, Beijing City University, Beijing 101399, China | | | ZHU Zhi-ping | Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, China | | | LI Xin-rong | Institute of Plant Nutrition and Resources, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100097, China | | | ZOU Guo-yuan | Institute of Plant Nutrition and Resources, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100097, China | gyzou@163.com |
|
| Hits: 1402 |
| Download times: 1494 |
| Abstract: |
| Animal slurry storage is an important source of ammonia(NH3) and greenhouse gas emissions. This study aimed to explore the effects of modified vermiculite covers on gas mitigation from dairy slurry storage. Four treatments of dairy biogas slurry storage were set in this study, including two treatments using expanded vermiculite modified with acid-metal solutions, namely copper sulfate-modified vermiculite(CuSO4-VM) and zinc chloride-modified vermiculite(ZnCl2-VM), and an unmodified vermiculite cover(UN-VM) and the control with no cover(CK). The emission concentrations of NH3, methane(CH4), nitrous oxide(N2O), and carbon dioxide(CO2) from 32 d of slurry storage were measured continuously. The mitigation effects(MEs) for each specific gas under different cover treatments were compared, and the reasons were analyzed. The results showed that the modification of vermiculite enhanced the MEs on NH3 and CH4.ZnCl2-VM, CuSO4-VM, and UN-VM reduced the NH3 emissions by 90%, 81%, and 34%, respectively; the corresponding MEs on CH4 were 58%, 21%, and 14%, and those on CO2 were -8%, 2%, and 20%. The modified vermiculite became acidic, which resulted in a slurry acidification effect when applied to the slurry surface, thereby contributing to the high ME on NH3. The flocculation of the organic matter in the slurry owing the added modified vermiculite and the good coverage formed on the slurry surface led to the increased reduction in CH 4 emissions. However, the increase in acidity after the modification reduced the ME on CO2, and the CO2 emissions in ZnCl2-VM increased. The low temperature conditions in the study resulted in little N2O emissions during the storage period; therefore, the effect of modification on N2O emissions could not be judged in this study. In summary, the covering of slurry using modified vermiculite may be an effective NH 3 and CH4 mitigation method. |
|
|
|
