Abstract
Vietnam is now facing the risk of environmental pollution from inappropriate animal manure management chain. Comparative research on manure management chains between livestock farms with and without biogas showed that non-biogas livestock households discharged approximately 15 % of the total manure produced into the environment while biogas livestock farms discharged a large volume of digestate (up to 50 %) into the environment because of its low nutrient content and high transportation costs. The filtration experiment therefore was conducted to treat the digestate by using crop residue filtration. The results showed that filtration of digestate by different crop residues does not work well with some nutrients, such as nitrogen and potassium from crop residue diluted in digestate, resulting in additional polluted digestate.
The passive aeration composting experiment showed that the composting of biochar or crop residue with digestate showed significantly lower CH4 and N2O emissions compared with traditional composting of pig manure. The combined application of digestate and rice straw biochar (D+B) for paddy rice also reduced CH4 emissions from paddy rice field and increased grain yield, contributing to long-term C-sequestration.
The passive aeration composting experiment showed that the composting of biochar or crop residue with digestate showed significantly lower CH4 and N2O emissions compared with traditional composting of pig manure. The combined application of digestate and rice straw biochar (D+B) for paddy rice also reduced CH4 emissions from paddy rice field and increased grain yield, contributing to long-term C-sequestration.
| Originalsprog | Engelsk |
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| Forlag | Department of Plant and Environmental Sciences, Faculty of Science, University of Copenhagen |
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| Antal sider | 213 |
| Status | Udgivet - 2014 |