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Reactive transport modelling of long-term phosphorus dynamic in the compact constructed   wetland using COMSOL Multiphysics
KTH, School of Architecture and the Built Environment (ABE), Sustainable development, Environmental science and Engineering, Land and Water Resources Engineering. SEED-KTH. (Environmental Geochemistry Group)
KTH, School of Architecture and the Built Environment (ABE), Sustainable development, Environmental science and Engineering, Land and Water Resources Engineering. SEED-KTH. (Environmental Geochemistry Group)
Department of Civil, Environmental and Natural Resources Engineering. (Architecture and Water)
KTH, School of Architecture and the Built Environment (ABE), Sustainable development, Environmental science and Engineering, Land and Water Resources Engineering. SEED-KTH. (Environmental Physics)
(English)In: Ecological Engineering JournalArticle in journal (Other academic) Submitted
Abstract [en]

A three-dimensional reactive transport model (RETRAP-3D) was developed by this study in the COMSOL Multiphysics®software to evaluate the long-term sorption capacity and mechanisms of dissolved reactive phosphorus removal in reactive adsorbent. The model coupledphysics interfaces for water flow, transport of reactive species, reaction kinetics for chemical compositions and biofilm development. Simulations were conducted for Polonite®, Filtralite P®, and Blast Furnace Slag mediaat fully saturated media, equilibrium miscible solution and isothermal heat transfer conditions. The model was validated using column experimental data ofsimilar media for application in constructed filter beds. The general modelling results showed good agreement with the measured breakthrough data. The most significant DIP retention capacity (P < 0.02) and longest residence time(1250 days) has been found for Polonite® and the most insignificant DIP retention for blast furnace slag (P > 0.54). The DIP removal was significantly correlated to factors of pH change, media characteristics, hydraulic dosage and retention times. These results demonstrate the reliability of the model as aflexible tool to predict the long-term performance of filter media and better understand processes within the system under various operational, weather and wastewater conditions.

Keywords [en]
Adsorption; Phosphorus retention; Compact Reactive Filter; COMSOL; Porous Reactive Media; Reactive Solute Transport
National Category
Water Engineering
Identifiers
URN: urn:nbn:se:kth:diva-207828OAI: oai:DiVA.org:kth-207828DiVA, id: diva2:1098675
Funder
StandUp
Note

QC 20170529

Available from: 2017-05-24 Created: 2017-05-24 Last updated: 2017-05-29Bibliographically approved
In thesis
1. Modelling phosphorus dynamics in constructed wetlands upgraded with reactive filter media
Open this publication in new window or tab >>Modelling phosphorus dynamics in constructed wetlands upgraded with reactive filter media
2017 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

Developing low-cost and effective technologies to upgrade phosphorus (P) removal from the catchment runoffs and rural wastewater treatment facilities is one of the main research agendas to save the Baltic Sea from eutrophication. In Sweden, the construction of the constructed wetlands has been one of the environmental objectives for wastewater quality improvement in the small communities. However, the insufficiently understanding of the mechanisms underlying the process of phosphorus mobility and sorption in the constructed wetlands has limited design of the effective constructed wetlands. To provide the better understanding of sorption process in the catchment and constructed wetland system, this thesis used the GIS-based Soil and Water Assessment Tool (SWAT) to predict phosphorus mobility and identify the critical diffusing sources of phosphorus loss in the Oxunda catchment (Paper I). Then, the study developed the three-dimensional numerical Reactive TRAnsPort Model (RETRAP - 3D) in the COMSOL Multiphysics® for evaluating the long - term sorption processes and removal efficiencies of the porous reactive media for upgrading the performance of constructed wetlands (Paper II and III). The latter model coupled many physics equations to solve process of water flow, reaction kinetics and solute transport in the porous reactive adsorbent media for application in the constructed wetlands. The data from the field measurements and column experiments have been used to demonstrate the model simulation accuracy to capture the process of phosphorus sorption in the real environment. Modeling results ranked the phosphorus removal efficiency of the adsorbent media as follows: Polonite® (88 %), Filtralite P® (85%), BFS (62%), Wollastonite (57 %). The satisfactory agreement which obtained between the simulated outputs and measured data confirmed that the SWAT and RETRAP-3D are useful tools for describing various processes in the complicated system. However, further study is required to generate and validate more experimental data to evaluate the sensitivity of local parameters.

Place, publisher, year, edition, pages
KTH: KTH Royal Institute of Technology, 2017. p. 35
Series
TRITA-LWR. LIC, ISSN 1650-8629 ; 2017:02
Keywords
Constructed Wetland, COMSOL, Modelling, Reactive Solute Transport, Sorption Process
National Category
Water Engineering
Research subject
Land and Water Resources Engineering
Identifiers
urn:nbn:se:kth:diva-207613 (URN)978-91-7729-436-8 (ISBN)
Presentation
2017-06-12, V1, Teknikringen 76, KTH, STOCKHOLM, 13:00 (English)
Opponent
Supervisors
Note

This reserch project was finacially supported by Lars Erik Lundberg scholarship foundation for projectnumber (2015/34 and 2016/12), ÅkeochGreta Lissheds Stiftelsen for project number (2015-00026), J.Gust. Richert Stiftelsen and Ecopool researchproject for smart and sustainable environment. QC 20170523

Available from: 2017-05-23 Created: 2017-05-22 Last updated: 2017-06-02Bibliographically approved

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