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Collaborative project: Separation and acidification after precipitation of slurry from cattle barns - Subproject A (SAFT2cattle)
Project
Project code: 281C602A21
Contract period: 10.05.2023
- 09.05.2026
Budget: 364,850 Euro
Purpose of research: Applied research
Keywords: stable building, cattle, agricultural engineering, farmyard manure, fertilization, emissions, climate protection
Based on the results of the SAFT project, which significantly reduces ammonia and methane emissions by acidifying slurry with sulphuric acid, a technology is being developed which is also suitable for cattle farming. The technology is to be optimised in order to reduce acid consumption, which will increase cost and resource efficiency. By using calcium additives, the carbonate buffer, which is responsible for most of the amount of acid during acidification, is eliminated and precipitated in advance. Separation of the slurry into a liquid and a solid phase further reduces the amount of acid required and leads to nutrient removal from the liquid phase.Considering these factors, alternatives to sulphuric acid are being searched for. This makes the process also applicable in organic farming, the danger of sulphur overfertilisation after slurry application is eliminated, the problem of concrete corrosion in slurry channels and storage tanks is minimised and the methane gas yield when using slurry in biogas plants is increased. First, the use of Ca additives and separation of the slurry to precipitate the carbonate buffer is investigated in laboratory tests. Finally, the amount of acid required is determined on the slurry prepared in this way and the use of alternatives to sulphuric acid is investigated. The biogas formation potential is measured on the slurry acidified in this way. The already established acidification technology is extended by a carbonate precipitation module and a separation unit. The system will be equipped with a newly developed volumetric carbonate content determination system. This is to replace the susceptible and maintenance-intensive pH value measurement by pH sensors. At the end, an economic evaluation of the acidification technology will be made, taking into account the methane and ammonia emission reduction, the biogas potential and a calculation of the fertiliser balancing.
Section overview
Subjects
- Animal Husbandry
- Climate Change
