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Technical University of Crete
Technical University of Crete
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| URI | http://purl.tuc.gr/dl/dias/5FC83B6F-58BE-43E3-AC30-941387743079 | - |
| Identifier | https://doi.org/10.1016/j.wasman.2018.01.020 | - |
| Identifier | https://www.sciencedirect.com/science/article/pii/S0956053X18300205 | - |
| Language | en | - |
| Extent | 7 pages | en |
| Title | Production of organic fertilizer from olive mill wastewater by combining solar greenhouse drying and composting | en |
| Creator | Markakis N. | en |
| Creator | Fountoulakis, Michael | en |
| Creator | Nikolaidis Nikolaos | en |
| Creator | Νικολαιδης Νικολαος | el |
| Creator | Manios Thrassyvoulos | en |
| Creator | Galliou F. | en |
| Publisher | Elsevier | en |
| Content Summary | Olive mill wastewater (OMW) is generated during the production of olive oil. Its disposal is still a major environmental problem in Mediterranean countries, despite the fact that a large number of technologies have been proposed up to date. The present work examines for the first time a novel, simple and low-cost technology for OMW treatment combining solar drying and composting. In the first step, OMW was dried in a chamber inside a solar greenhouse using swine manure as a bulking agent. The mean evaporation rate was found to be 5.2 kg H2O/m2/d for a drying period of 6 months (February–August). High phenol (75%) and low nitrogen (15%) and carbon (15%) losses were recorded at the end of the solar drying process. The final product after solar drying was rich in nutrients (N: 27.8 g/kg, P: 7.3 g/kg, K: 81.6 g/kg) but still contained significant quantities of phenols (18.4 g/kg). In order to detoxify the final product, a composting process was applied as a second step with or without the use of grape marc as bulking agent. Results showed that the use of grape marc as a bulking agent at a volume ratio of 1:1 achieved a higher compost temperature profile (60 °C) than 2:1 (solar drying product: grape marc) or no use (solar drying product). The end product after the combination of solar drying and composting had the characteristics of an organic fertilizer (57% organic carbon) rich in nutrients (3.5% N, 1% P, 6.5% K) with quite low phenol content (2.9 g/kg). Finally, the use of this product for the cultivation of pepper plants approved its fertility which was found similar with commercial NPK fertilizers. | en |
| Type of Item | Peer-Reviewed Journal Publication | en |
| Type of Item | Δημοσίευση σε Περιοδικό με Κριτές | el |
| License | http://creativecommons.org/licenses/by/4.0/ | en |
| Date of Item | 2019-09-13 | - |
| Date of Publication | 2018 | - |
| Subject | Phenolic compounds | en |
| Subject | Resource recovery | en |
| Subject | Sun drying | en |
| Subject | Treatment | en |
| Subject | Wastewater | en |
| Bibliographic Citation | F. Galliou, N. Markakis, M.S. Fountoulakis, N. Nikolaidis and T. Manios, "Production of organic fertilizer from olive mill wastewater by combining solar greenhouse drying and composting," Waste Manag., vol. 75, pp. 305-311, May 2018. doi: 10.1016/j.wasman.2018.01.020 | en |
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