WP 2: Technical Feasibility Studies
WP 2 aimed to speed up the process of overcoming technical and practical bottlenecks for implementing slurry acidification technologies (SATs) in the Baltic Sea Region.
A feasibility study summarized the understanding of and solutions for potential issues and risks related to the transfer of SATs to countries in the region. Seminars and or workshops were organized for farmers, farmer associations, advisory services and other relevant stakeholders to disseminate WP2 outputs.
Specific objectives included analyses of the following:
- Relevant manure handling systems for SATS
- Equipment quality evaluations
- Slurry buffering capacity
- Slurry acidification effects on soils
- Working environment and safety
- Ammonia emissions from acidified slurry
Some of the key findings based on the analyses:
- In-field and in-storage technologies are the easiest to implement. In-house technology is best implemented in connection to the construction of a new animal barn.
- Sulphuric acid is a strong acid and therefore dangerous to handle. WP2 has created a guide “Working environment and safety” to help to cover safety issues. WP2 recommends both choosing a technique with little or no risk of contact with acid and taking a variety of other precautionary method
- The amounts of acid required to acidify the slurries to a specific pH level varied widely between slurry types.
- Research about the impact of acidified slurry on soil showed that the acidified slurry induces more soluble salts into soil solution compared to non-treated slurry. Some of these compounds are more movable, which causes risk of faster leaching.
- Acidification of slurry with sulphuric acid will, in most cases, increase the need for liming, which means additional costs. At an application rate of 45 m3 per ha, the acidified pig slurry (pH 6.2) compared to the non-acidified slurry (pH 7.9) lowered pH of acidic soil (pH 5) by 0.1 units, which correspond to a liming demand of 0.2–0.4 tonnes per ha of calcium carbonate (100% efficiency)
- The most obvious benefit of acidification is its ability to reduce ammonia emissions from slurry, both from storage and after field application when enough acid is used.
Reports produced by WP 2
The feasibility study can be read below. Find the rest of the reports here.
WP 2 contacts
WP Leader: Institute of Technology and Life Sciences, Poland
Wacław Romaniuk, email: firstname.lastname@example.org
Assisting project partner: RISE Research Institutes Sweden – Sweden
Lena Rodhe, email: email@example.com