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https://doi.org/10.21256/zhaw-18461| Publication type: | Conference poster |
| Type of review: | No review |
| Title: | Influence of pH change on the phosphorus cycle in aquaponics |
| Authors: | Gartmann, Florentina Schmautz, Zala Junge, Ranka |
| et. al: | No |
| DOI: | 10.21256/zhaw-18461 |
| Conference details: | 9th International Phosphorus Workshop (IPW9), Zurich, 8-12 July 2019 |
| Issue Date: | 2019 |
| Publisher / Ed. Institution: | ZHAW Zürcher Hochschule für Angewandte Wissenschaften |
| Language: | English |
| Subjects: | Aquaponics; PH change; Phosphorus cycle |
| Subject (DDC): | 577: Ecology 630: Agriculture |
| Abstract: | In fish farming, large amounts of phosphorus (P) are accumulating in the discharge, which on one side poses a problem due to eutrophication potential, but on the other side opens a chance for recycling of this critically limiting nutrient. In aquaponics (AP), which is the combined cultivation of fish (aquaculture) and plants (hydroponic) in one water cycle, plants assimilate P present in aquaculture discharge. The aim of this study was to investigate the P-cycling in aquaponic in order to be able to further optimise P utilisation. For this, the effect of pH manipulation on the system was examined. Three replicates of semi-commercial size aquaponic systems, stocked with Nile tilapia (Oreochromis niloticus), and planted with lettuce (Salanova® Batavia) were monitored from 22th September to 8th November 2017. The pH was adjusted to 6.0±0.2 by adding acid (HCl) during weeks 1 and 2, and to 7.3±0.3 by adding bases (KOH and Ca(OH)2) during weeks 3 and 4. Ortho-P and total-P from different sampling points in the system (system water, sludge, and deposits) were analysed. In addition, biomass production of fish and lettuce, and its nutrient content was compared between the triplicates. The P balance showed that 41% and 8% of the total P inputs provided by feed and water were absorbed by fish and plants, respectively. 27% of P accumulated in the system water, and 24% in form of deposits (biofilm on sump and fish tank surface and deposits on digester heater). Furthermore, digested sludge contained more ortho-P (14-55% of total-P) than fresh sludge (5-10% of total-P). In addition, around 90% of total-P was present as ortho-P in a system water. The ortho-P concentrations after the manipulations of pH in the aquaponic system water surprisingly increased with increasing pH. This is probably due to the complex dynamics between P and Ca. The established P mass balance identified and quantified several P pools, demonstrating that aquaponics systems can maximize overall P utilization if a digester is included into the loop. |
| URI: | https://digitalcollection.zhaw.ch/handle/11475/18461 |
| Fulltext version: | Published version |
| License (according to publishing contract): | CC BY 4.0: Attribution 4.0 International |
| Departement: | Life Sciences and Facility Management |
| Organisational Unit: | Institute of Natural Resource Sciences (IUNR) |
| Appears in collections: | Publikationen Life Sciences und Facility Management |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| 2019_Gartmann_Influence-of-pH-change-on-the-phosphorus-cycle-in-aquaponics.pdf | 1.18 MB | Adobe PDF |  View/Open |
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Gartmann, F., Schmautz, Z., & Junge, R. (2019). Influence of pH change on the phosphorus cycle in aquaponics. 9th International Phosphorus Workshop (IPW9), Zurich, 8-12 July 2019. https://doi.org/10.21256/zhaw-18461
Gartmann, F., Schmautz, Z. and Junge, R. (2019) ‘Influence of pH change on the phosphorus cycle in aquaponics’, in 9th International Phosphorus Workshop (IPW9), Zurich, 8-12 July 2019. ZHAW Zürcher Hochschule für Angewandte Wissenschaften. Available at: https://doi.org/10.21256/zhaw-18461.
F. Gartmann, Z. Schmautz, and R. Junge, “Influence of pH change on the phosphorus cycle in aquaponics,” in 9th International Phosphorus Workshop (IPW9), Zurich, 8-12 July 2019, 2019. doi: 10.21256/zhaw-18461.
GARTMANN, Florentina, Zala SCHMAUTZ und Ranka JUNGE, 2019. Influence of pH change on the phosphorus cycle in aquaponics. In: 9th International Phosphorus Workshop (IPW9), Zurich, 8-12 July 2019. Conference poster. ZHAW Zürcher Hochschule für Angewandte Wissenschaften. 2019
Gartmann, Florentina, Zala Schmautz, and Ranka Junge. 2019. “Influence of pH Change on the Phosphorus Cycle in Aquaponics.” Conference poster. In 9th International Phosphorus Workshop (IPW9), Zurich, 8-12 July 2019. ZHAW Zürcher Hochschule für Angewandte Wissenschaften. https://doi.org/10.21256/zhaw-18461.
Gartmann, Florentina, et al. “Influence of pH Change on the Phosphorus Cycle in Aquaponics.” 9th International Phosphorus Workshop (IPW9), Zurich, 8-12 July 2019, ZHAW Zürcher Hochschule für Angewandte Wissenschaften, 2019, https://doi.org/10.21256/zhaw-18461.
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