One-Time Acidification of Slurry: What Is the Most Effective Acid and Treatment Strategy?
Acidification of slurry is a common practice to reduce ammonia and methane emissions. Sulfuric acid is usually used for this process. However, this has been criticized due to the high sulfur input into soils. Therefore, the objective of this study is to show the effectiveness of a one-time acidifica...
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| Format: | Article |
| Language: | English |
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MDPI AG
2021-06-01
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| Series: | Agronomy |
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| Online Access: | https://www.mdpi.com/2073-4395/11/7/1319 |
| _version_ | 1797528480870563840 |
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| author | Veronika Overmeyer Anita Kube Joachim Clemens Wolfgang Büscher Manfred Trimborn |
| author_facet | Veronika Overmeyer Anita Kube Joachim Clemens Wolfgang Büscher Manfred Trimborn |
| author_sort | Veronika Overmeyer |
| collection | DOAJ |
| description | Acidification of slurry is a common practice to reduce ammonia and methane emissions. Sulfuric acid is usually used for this process. However, this has been criticized due to the high sulfur input into soils. Therefore, the objective of this study is to show the effectiveness of a one-time acidification with alternative acids also in combination with other treatment strategies. The amount of acid as well as the change of pH value during storage were investigated. For most variants, a strong pH increase occurred within the first ten days after acidification. Mineral acids (sulfuric or hydrochloric acid) resulted in a lower pH increase compared to organic acids (lactic, acetic, and citric acid). Under anaerobic storage conditions, the pH remained significantly lower. The addition of glucose before acidification resulted in lower pH values during the first week, but in the long term, the conversion of glucose to carbonate led to higher pH values. A previous separation process was able to reduce the amount of acid. Although the pH increase was not that strong in the first days after acidification, it was much faster and stronger afterwards due to the lower buffer capacity in the separated slurry. A long-term pH reduction was achieved by acidification to pH 3.0, but this was associated with an increased amount of acid. On the basis of the results, a combination of organic acids with anaerobic storage can be recommended as an alternative to sulfuric acid. |
| first_indexed | 2024-03-10T09:58:54Z |
| format | Article |
| id | doaj.art-a248ec1f76294b25948ee3774f296d1e |
| institution | Directory Open Access Journal |
| issn | 2073-4395 |
| language | English |
| last_indexed | 2024-03-10T09:58:54Z |
| publishDate | 2021-06-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Agronomy |
| spelling | doaj.art-a248ec1f76294b25948ee3774f296d1e2023-11-22T02:06:02ZengMDPI AGAgronomy2073-43952021-06-01117131910.3390/agronomy11071319One-Time Acidification of Slurry: What Is the Most Effective Acid and Treatment Strategy?Veronika Overmeyer0Anita Kube1Joachim Clemens2Wolfgang Büscher3Manfred Trimborn4Institute of Agricultural Engineering, University of Bonn, 53115 Bonn, GermanyInstitute of Agricultural Engineering, University of Bonn, 53115 Bonn, GermanySF-Soepenberg GmbH, 46569 Hünxe, GermanyInstitute of Agricultural Engineering, University of Bonn, 53115 Bonn, GermanyInstitute of Agricultural Engineering, University of Bonn, 53115 Bonn, GermanyAcidification of slurry is a common practice to reduce ammonia and methane emissions. Sulfuric acid is usually used for this process. However, this has been criticized due to the high sulfur input into soils. Therefore, the objective of this study is to show the effectiveness of a one-time acidification with alternative acids also in combination with other treatment strategies. The amount of acid as well as the change of pH value during storage were investigated. For most variants, a strong pH increase occurred within the first ten days after acidification. Mineral acids (sulfuric or hydrochloric acid) resulted in a lower pH increase compared to organic acids (lactic, acetic, and citric acid). Under anaerobic storage conditions, the pH remained significantly lower. The addition of glucose before acidification resulted in lower pH values during the first week, but in the long term, the conversion of glucose to carbonate led to higher pH values. A previous separation process was able to reduce the amount of acid. Although the pH increase was not that strong in the first days after acidification, it was much faster and stronger afterwards due to the lower buffer capacity in the separated slurry. A long-term pH reduction was achieved by acidification to pH 3.0, but this was associated with an increased amount of acid. On the basis of the results, a combination of organic acids with anaerobic storage can be recommended as an alternative to sulfuric acid.https://www.mdpi.com/2073-4395/11/7/1319manure managementmineral acidsorganic acidsanaerobic storageseparationaddition of glucose |
| spellingShingle | Veronika Overmeyer Anita Kube Joachim Clemens Wolfgang Büscher Manfred Trimborn One-Time Acidification of Slurry: What Is the Most Effective Acid and Treatment Strategy? Agronomy manure management mineral acids organic acids anaerobic storage separation addition of glucose |
| title | One-Time Acidification of Slurry: What Is the Most Effective Acid and Treatment Strategy? |
| title_full | One-Time Acidification of Slurry: What Is the Most Effective Acid and Treatment Strategy? |
| title_fullStr | One-Time Acidification of Slurry: What Is the Most Effective Acid and Treatment Strategy? |
| title_full_unstemmed | One-Time Acidification of Slurry: What Is the Most Effective Acid and Treatment Strategy? |
| title_short | One-Time Acidification of Slurry: What Is the Most Effective Acid and Treatment Strategy? |
| title_sort | one time acidification of slurry what is the most effective acid and treatment strategy |
| topic | manure management mineral acids organic acids anaerobic storage separation addition of glucose |
| url | https://www.mdpi.com/2073-4395/11/7/1319 |
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