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Acidification of slurry with different pretreatments and their effects on buffer capacity and acid consumption
Authors: Veronika Overmeyer, Felix Holtkamp, Manfred Trimborn, Joachim Clemens, Wolfgang B?scher
Identifier: CSBE21190
Download file: https://library.csbe-scgab.ca/docs/meetings/2021/CSBE21190.pdf
Published in: CSBE-SCGAB Technical Conferences » 5th CIGR and AGM Quebec City 2021 » Regular Sessions
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Description: Slurry acidification is a well-known method for reducing methane and ammonia emissions. Since there are different buffers in the slurry, the acid addition must be adapted to the different buffer capacities. In the acidic range, fatty acid buffer and the carbonate buffer are relevant. The objective of the present study was to investigate slurries with different pretreatments (storage conditions, separation) with regard to their acid consumption for defined pH values. Titration experiments were carried out with samples of fresh dairy cow slurry, fattening pig slurry and sow slurry, which were stored over a period of 12 weeks at 4.7 ?C and 23.6 ?C. Additionally, the liquid phase was observed immediately after separation and after 8 weeks. The slurries were titrated weekly with HCl to pH value 2.5 by using a titrator. The acid consumption up to pH values 5.5 and 3.0 of the various treatments were compared with each other. Results showed a lower acid consumption for the liquid phase compared to the non separated slurry when titrating up to pH value 3.0. Furthermore, different storage temperatures affected the acid consumption. Within storage time the acid consumption for achieving the pH value 3.0 from 5.5 changes in all slurries. This effect could be an indicator for changes between the fatty acid buffer and carbonate buffer over the storage period. The slurry pretreatment and the condition and duration of storage have an influence on the buffer capacity and amount of acid for targeted pH value. This influences the current costs of acidification technologies.
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Date: 2021-06-11
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Conference name: 5th CIGR International Conference and CSBE-SCGAB AGM 2021, Quebec City,QC, 11-14 May 2021.
Session name: Waste Management 2 - Animal Waste & Treatment
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Publication type: Presentation
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Language 1: en
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Rights: Canadian Society for Bioengineering
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DOI:
Description: Slurry acidification is a well-known method for reducing methane and ammonia emissions. Since there are different buffers in the slurry, the acid addition must be adapted to the different buffer capacities. In the acidic range, fatty acid buffer and the carbonate buffer are relevant. The objective of the present study was to investigate slurries with different pretreatments (storage conditions, separation) with regard to their acid consumption for defined pH values. Titration experiments were carried out with samples of fresh dairy cow slurry, fattening pig slurry and sow slurry, which were stored over a period of 12 weeks at 4.7 ?C and 23.6 ?C. Additionally, the liquid phase was observed immediately after separation and after 8 weeks. The slurries were titrated weekly with HCl to pH value 2.5 by using a titrator. The acid consumption up to pH values 5.5 and 3.0 of the various treatments were compared with each other. Results showed a lower acid consumption for the liquid phase compared to the non separated slurry when titrating up to pH value 3.0. Furthermore, different storage temperatures affected the acid consumption. Within storage time the acid consumption for achieving the pH value 3.0 from 5.5 changes in all slurries. This effect could be an indicator for changes between the fatty acid buffer and carbonate buffer over the storage period. The slurry pretreatment and the condition and duration of storage have an influence on the buffer capacity and amount of acid for targeted pH value. This influences the current costs of acidification technologies.
Keywords:
Résumé:
Mots-clés:
Citation:
Volume:
Issue:
Pages -
Contributor:
Date: 2021-06-11
Technical field:
Conference name: 5th CIGR International Conference and CSBE-SCGAB AGM 2021, Quebec City,QC, 11-14 May 2021.
Session name: Waste Management 2 - Animal Waste & Treatment
Other information:
Type: Text.Abstract
Format:
Publication type: Presentation
Source:
Relation:
Coverage:
Language 1: en
Language 2:
Rights: Canadian Society for Bioengineering
Notes:
Other files:
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