Water Quality Improvement Efficiency Evaluation in Subsurface Flow-Type Wetland (SFTW) And Developed of Porosity Expanded Ceramics
Wetlands are divided into free water surface flow-type system and subsurface flow-type system(SFTW). SFTW is being evaluated to be excellent quality improvement efficiency than the free water surface flow-type, because it is removed by filtration, adsorption mechanism while contaminants pass through the filter media layer. In particular, the expected increase nitrogen removal efficiency as a function of denitrifying microorganisms that live in between when entering the underground flow through a wetland type nitrification process in the media layer high DO conditions. In this study, we developed porosity expanded ceramic that is attached denitrifying microorganisms and improved T-P adsorption performance. Then, we evaluated improvement of water quality efficiency in an SFTW. As a result, the developed ceramics were shown that T-P removal rate of 80-90% in lab scale. The BOD removal efficiency was no significant difference. But, SS ,T-N and T-P removal efficiency was way better than surface flow type wetland. SS removal efficiency is estimated to increase because of the physical properties of the SFTW. It shall be determined in anaerobic localized ground water when nitrogen removal efficiency also rises by the action of denitrifying microorganisms. And it is determined that the pore characteristics and adsorption T-P removal efficiency by the raw absorption, metabolism mechanism of microorganisms of the porous ceramic filter media was also raised.
Keywords: wetlands, subsurface flow-type system(SFTW), denitrifying microorganisms, porosity expanded ceramic, raw absorption