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Modelación De La Calidad De Las Aguas En Los Humedales Artificiales De Flujo Superficial (hafs). Aplicación a Los Hafs Del Tancat De La Pipa En L'albufera De Valencia.
| Content Provider | Semantic Scholar |
|---|---|
| Author | Bellés, Sara Gargallo |
| Copyright Year | 2017 |
| Abstract | Constructed wetlands (CWs) are anthropically designed systems to improve and optimize certain physical and biochemical processes that occur in the ecosystems of natural wetlands with the main objective of removing pollutants from the water. This technology, which usually has been used for the treatment of urban wastewater, is being recently applied for treating a great variety of flows, including eutrophic water. Treatment efficiency of these systems depends on the interrelation of a great variety of processes and factors that hinder the establishment of simple principles for its design and/or exploitation. Therefore, mathematical models are useful tools to increase the knowledge about this technology and to optimize their design and management. During the last decades, a remarkable advance has been produced in the modelling of CWs, especially subsurface flow systems. However, an equivalent level of development has not been reached in the modelling of surface flow systems. In this type of CWs, where there is not a porous medium through which the water to be treated circulates, the influence of environmental factors such as wind or avifauna, and the interaction with the layer of sediment can be more intense. Therefore, it is necessary having models applicable to this type of CWs which facilitate the representation of this particular casuistry. In this PhD Dissertation a mechanistic biokinetic model for the treatment of eutrophic water in free water surface constructed wetlands has been developed. The structure of the Activated Sludge Model (ASM) has been used to represent the processes that affect to the main variables of water quality in eutrophic systems, i.e., suspended solids, phytoplankton, different forms of nitrogen and phosphorus and matter organic. The model has been implemented in the software AQUASIM and has been calibrated and validated in two real systems that treated hypertrophic water from Lake l ́Albufera (Valencia) for three years. One of the most remarkable contributions of this model is the ability for simulating the operation conditions of full-scale systems, i.e., for reproducing the interactions that occur between the free water surface constructed wetland and the environment where it is integrated. A novel contribution of this model is the capacity for simulating the effects produced by the activity of the avifauna and by the action of the wind speed in the resuspension of sediments. Another important contribution is the quantification of the effect of the processes involved in the cycles of each variable. This has been able to determine the importance of resuspension in the removal of suspended solids, especially that caused by the action of the wind. Likewise, vegetation cover has been demonstrated to be an easy to monitor and valid parameter for the simulation of the effect of emerging macrophytes in water quality in surface flow CWs, in both sedimentation and resuspension processes, as well as in nutrients uptake. On the other hand, this research has allowed extend the knowledge about the immobility of microorganisms in surface flow CWs. It has also been proven that high vegetation covers as well as harvesting of emerging macrophytes are crucial factors in nutrients removal in this type of systems. |
| Starting Page | 1 |
| Ending Page | 1 |
| Page Count | 1 |
| File Format | PDF HTM / HTML |
| DOI | 10.4995/Thesis/10251/78215 |
| Alternate Webpage(s) | https://riunet.upv.es/bitstream/handle/10251/78215/GARGALLO%20-%20MODELACI%C3%93N%20DE%20LA%20CALIDAD%20DE%20LAS%20AGUAS%20EN%20LOS%20HUMEDALES%20ARTIFICIALES%20DE%20FLUJO%20SUPERFICI....pdf?isAllowed=y&sequence=1 |
| Alternate Webpage(s) | https://doi.org/10.4995/Thesis%2F10251%2F78215 |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
