Reactive transport modelling of long-term phosphorus dynamic in the compact constructed   wetland using COMSOL Multiphysics

Hamisi, Rajabu, 1978- (author): KTH,Mark- och vattenteknik,SEED-KTH,Environmental Geochemistry Group

Renman, Gunno (author): KTH,Mark- och vattenteknik,SEED-KTH,Environmental Geochemistry Group

Herrmann, Inga (author): Department of Civil, Environmental and Natural Resources Engineering,Architecture and Water

Thunvik, Roger (author): KTH,Mark- och vattenteknik,SEED-KTH,Environmental Physics

(creator_code:org_t)

Abstract Subject headings

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.

By the author/editor: Hamisi, Rajabu, ...; Renman, Gunno; Herrmann, Inga; Thunvik, Roger

About the subject

ENGINEERING AND TECHNOLOGY: ENGINEERING AND ...; and Civil Engineerin ...; and Water Engineerin ...

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