Modeling of phosphate removal by fitra P in fixed-bed columns
2011 (English)In: 2nd International Conference on Environmental Science and Technology , ICEST 2011 / [ed] Saji Baby; Bogdan Zygmunt, China, 2011, Vol. 2, 241-248 p.Conference paper (Refereed)
Hydropower still faces complex scientific and technical challenges in order to secure the availability and reliability of the power plants despite more than a century of development. The main challenge is due to new market constrains such as electrical market deregulation and introduction of renewable sources of energy. The major problem is related to the dynamic of the rotor involving several fields: hydraulics, power engineering and mechanics. On the other side, the large and growing hydropower world market represents an opportunity for technically advanced companies offering better efficiency. The difficulty to scale rigorously any technical advance makes full-scale experiment a necessity. World unique facilities are available at Porjus, Sweden, for this purpose. The Porjus Hydropower Centre is composed of a Francis (U8) and a Kaplan (U9) turbine of 10 MW, each exclusively dedicated to education, research and development. In order to further investigate specific issues related to availability and reliability, a project was initiated in 2006. The main objective is to make U9 a full-scale hydropower laboratory able firstly to furnish the necessary data for the development of rotor-dynamic models but also turbines and bearings. To this purposes more than 200 sensors have been installed to measure displacements, forces, pressure, film thickness, strains... The work presents an overview of the newly upgrade facility as well as some of the problems faced during the instrumentation of the machine.
This study investigated the feasibility of modeling phosphate (PO4-P) transport and removal in fixed-bed columns filled with commercial filter material Filtra P (Nordkalk, Finland) by means of the convection-dispersion equation and a Langmuir isotherm. Batch experiments on Filtra P were done in order to find Langmuir isotherm. Axial dispersion coefficient was estimated from recommended correlation in the literature. Four column experiments were carried out at different flow rates and PO4-P feed concentrations. HYDRUS-1D was used for simulation of PO4-P breakthrough curves. Simulated breakthrough curves were compared with experimental breakthrough curves obtained from column experiments. The model successfully predicted the PO4-P breakthrough curves for the columns with low influent concentration (11 mg dm-3), which is within the range normally found in wastewater (5-15 mg dm-3).
Place, publisher, year, edition, pages
China, 2011. Vol. 2, 241-248 p.
Research subject Fluid Mechanics; Urban Water Engineering
IdentifiersURN: urn:nbn:se:ltu:diva-31002Local ID: 508d490f-6425-4989-9356-d68b105eef6cISBN: 978-1-4244-9261-9OAI: oai:DiVA.org:ltu-31002DiVA: diva2:1004231
International Conference on Environmental Science and Technology : 26/02/2011 - 28/02/2011
Godkänd; 2011; Bibliografisk uppgift: CD-ROM; 20110502 (amijou)2016-09-302016-09-30Bibliographically approved