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Technical University of Crete
Technical University of Crete
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| URI: | http://purl.tuc.gr/dl/dias/78F87BBF-8222-4AF5-B0A8-9524E78802F2 | ||
| Year | 2025 | ||
| Type of Item | Diploma Work | ||
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| Bibliographic Citation | Alexandros Galathianakis, "Study of pilot sludge treatment wetlands under varying loads, with/without plants, installed in the field and in a greenhouse", Diploma Work, School of Chemical and Environmental Engineering, Technical University of Crete, Chania, Greece, 2025 https://doi.org/10.26233/heallink.tuc.103841 | ||
| Appears in Collections |
In this thesis, an analytical and comparative study of planted, unplanted and greenhouse-based artificial sludge dewatering wetlands under different secondary sewage sludge loadings was carried out. The experiment has been in operation for one year already (since May 2023) and includes 6 vertical flow artificial wetland tanks, located in the outdoor area of Chania Wastewater Treatment Plant (CWTP). In summary, the first two units were without vegetation (Control), the next two units were planted with Phragmites Australis and the last two units were planted with Phragmites Australis, but were placed in a greenhouse. All of the above tanks had the same dimensions of 1 m3 and the filling material chosen was gravel in various granulometry (pebbles to fine gravel). The tanks were loaded with sewage sludge according to the corresponding loading rate, while the loading frequency was determined by the loading cycle under consideration and its parameters (previous measurements, ambient temperature, percentage of moisture in the residual sludge, etc.). The experiment lasted 7 months, from May to December 2024. Sampling and analysis were carried out on the dewatered residual sludge, the sediments of each tank as well as on the biomass for a measurement in November. The following were examined: BOD5, COD, TSS, NH4+-H, NO3--N, TP, PO43-P, EC, pH, also for the dewatered residual sludge on the surface of the tanks the total solids (TS) were examined, dewatering efficiency, residual sludge volume, volatile solids to total solids (VS) as well as metals and metalloids. The analysis and results focus on the dehydration process and the residual sludge. The volume of residual sludge inside the units at the end of the experiment ranges from 15L-170L. The sludge volume reduction rates range from 95.8%-99.6%. The range of total solids contents was 19.1%-32.5%. While the average VS content was 74.5%-78.2%. The tanks outside the greenhouse and with the biomass as well as the low-load tank inside the greenhouse were observed to be the most effective tanks in terms of removing moisture from the residual sludge.
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