Monitoring N : P Ratio and Cd, Cu, Pb, and Zn Contents in Different Types of Anaerobic Digestates: A Six-Year Study Case
Depending on the quality of the input substrates, process parameters, and postfermentation treatments, digestates may contain a broad spectrum of potentially toxic elements. We suspected that these contents may vary on a broad scale even under seemingly stable process conditions at the biogas plant....
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| Format: | Article |
| Language: | English |
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Wiley
2020-01-01
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| Series: | International Journal of Agronomy |
| Online Access: | http://dx.doi.org/10.1155/2020/8816088 |
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| author | Christina-Luise Roß Kerstin Nielsen Jorita Krieger Marieke Hoffmann Karen Sensel-Gunke Frank Ellmer Timo Kautz |
| author_facet | Christina-Luise Roß Kerstin Nielsen Jorita Krieger Marieke Hoffmann Karen Sensel-Gunke Frank Ellmer Timo Kautz |
| author_sort | Christina-Luise Roß |
| collection | DOAJ |
| description | Depending on the quality of the input substrates, process parameters, and postfermentation treatments, digestates may contain a broad spectrum of potentially toxic elements. We suspected that these contents may vary on a broad scale even under seemingly stable process conditions at the biogas plant. Digestates from four biogas plants were therefore continuously analyzed for their contents of phosphorus, nitrogen, cadmium, copper, lead, and zinc over a period of six years. The input substrates varied between the plants (e.g., cattle and pig slurry and rye and maize silage), but were the same for each plant over the whole period. The N : P ratio of the digestates ranged from 2 to 24, with the digestate coming from cofermentation of pig slurry and energy crops (“DG Pig”) having the widest range of N : P ratio over the years. Heavy metal loads of all digestates and during all evaluations did not exceed the limits set by European or German legislation, but as previously expected, showed a large variability especially if cattle or pig manure were used as substrates. Copper content of Cattle slurry before digestion was 897.7 mg kg−1 DM in one case, and zinc content of DG Pig reached 590.2 mg kg−1 DM also once during the investigation. As a result, we strongly recommend to monitor especially phosphorus, copper, and zinc contents in digestates very closely and in short intervals. |
| format | Article |
| id | doaj-art-635218c3b5464fb792ec86e99202163b |
| institution | Kabale University |
| issn | 1687-8159 1687-8167 |
| language | English |
| publishDate | 2020-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | International Journal of Agronomy |
| spelling | doaj-art-635218c3b5464fb792ec86e99202163b2025-02-03T06:00:49ZengWileyInternational Journal of Agronomy1687-81591687-81672020-01-01202010.1155/2020/88160888816088Monitoring N : P Ratio and Cd, Cu, Pb, and Zn Contents in Different Types of Anaerobic Digestates: A Six-Year Study CaseChristina-Luise Roß0Kerstin Nielsen1Jorita Krieger2Marieke Hoffmann3Karen Sensel-Gunke4Frank Ellmer5Timo Kautz6Berlin Humboldt University, Faculty of Life Sciences, Albrecht Daniel Thaer-Institute of Agricultural and Horticultural Sciences, Berlin 14195, GermanyInstitute for Agricultural and Urban Ecological Projects, Berlin Humboldt University, Berlin 10115, GermanyJulius Kühn-Institut (JKI), Institute for Crop and Soil Science, Brunswick 38116, GermanyDeutsche Umwelthilfe e.V., Berlin 10178, GermanyInstitute for Agricultural and Urban Ecological Projects, Berlin Humboldt University, Berlin 10115, GermanyBerlin Humboldt University, Faculty of Life Sciences, Albrecht Daniel Thaer-Institute of Agricultural and Horticultural Sciences, Berlin 14195, GermanyBerlin Humboldt University, Faculty of Life Sciences, Albrecht Daniel Thaer-Institute of Agricultural and Horticultural Sciences, Berlin 14195, GermanyDepending on the quality of the input substrates, process parameters, and postfermentation treatments, digestates may contain a broad spectrum of potentially toxic elements. We suspected that these contents may vary on a broad scale even under seemingly stable process conditions at the biogas plant. Digestates from four biogas plants were therefore continuously analyzed for their contents of phosphorus, nitrogen, cadmium, copper, lead, and zinc over a period of six years. The input substrates varied between the plants (e.g., cattle and pig slurry and rye and maize silage), but were the same for each plant over the whole period. The N : P ratio of the digestates ranged from 2 to 24, with the digestate coming from cofermentation of pig slurry and energy crops (“DG Pig”) having the widest range of N : P ratio over the years. Heavy metal loads of all digestates and during all evaluations did not exceed the limits set by European or German legislation, but as previously expected, showed a large variability especially if cattle or pig manure were used as substrates. Copper content of Cattle slurry before digestion was 897.7 mg kg−1 DM in one case, and zinc content of DG Pig reached 590.2 mg kg−1 DM also once during the investigation. As a result, we strongly recommend to monitor especially phosphorus, copper, and zinc contents in digestates very closely and in short intervals.http://dx.doi.org/10.1155/2020/8816088 |
| spellingShingle | Christina-Luise Roß Kerstin Nielsen Jorita Krieger Marieke Hoffmann Karen Sensel-Gunke Frank Ellmer Timo Kautz Monitoring N : P Ratio and Cd, Cu, Pb, and Zn Contents in Different Types of Anaerobic Digestates: A Six-Year Study Case International Journal of Agronomy |
| title | Monitoring N : P Ratio and Cd, Cu, Pb, and Zn Contents in Different Types of Anaerobic Digestates: A Six-Year Study Case |
| title_full | Monitoring N : P Ratio and Cd, Cu, Pb, and Zn Contents in Different Types of Anaerobic Digestates: A Six-Year Study Case |
| title_fullStr | Monitoring N : P Ratio and Cd, Cu, Pb, and Zn Contents in Different Types of Anaerobic Digestates: A Six-Year Study Case |
| title_full_unstemmed | Monitoring N : P Ratio and Cd, Cu, Pb, and Zn Contents in Different Types of Anaerobic Digestates: A Six-Year Study Case |
| title_short | Monitoring N : P Ratio and Cd, Cu, Pb, and Zn Contents in Different Types of Anaerobic Digestates: A Six-Year Study Case |
| title_sort | monitoring n p ratio and cd cu pb and zn contents in different types of anaerobic digestates a six year study case |
| url | http://dx.doi.org/10.1155/2020/8816088 |
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