A novel approach of micro-pollutant separation in a stagnant water column
| Main Author: | Winarto, Felixtianus Eko Wismo |
|---|---|
| Format: | Article PeerReviewed application/pdf |
| Bahasa: | eng |
| Terbitan: |
Fakultas Teknik Universitas Gadjah Mada
, 2013
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| Subjects: | |
| Online Access: |
https://repository.ugm.ac.id/31/1/anovelapproach_with_correction1.pdf https://repository.ugm.ac.id/31/7/forumteknik2013gab.pdf https://repository.ugm.ac.id/31/ |
Daftar Isi:
- Filtration and precipitation are generally used in waste water treatment to separate pollutants. However, they are not cost effective and have problems of filter waste and time consumption. This research proposes a new approach using compressed air to lift-up micro suspended particles in wastewater treatment. The novelty of the approach is its sustainability, robustness, and cost effectiveness in micro pollutant separation. Air is forced through submerged nano diffuser to produce micro bubbles, which flow upward and lift-up suspended particles to separate them from water. A lab scale stagnant water column (100mm W x 100mm L x 240 mm H) is used in this micro pollutant separation process. Submerged sintered glass modules with porosities ranging from 1 to 40 microns are used to study the effect of air pressure and flow on the size of bubbles. The Phase Doppler Anemometry (PDA) is used to measure the bubble velocity (horizontal and vertical) and its diameter. Various forces that act on the bubble during its detachment from the micro diffuser are established and correlations for the forces acting on the particle-bubble system have been developed for different particle to bubble diameter ratios. Effects of air flow through diffuser, inlet air pressure and various porosities on bubble size are presented in this paper. The bubble velocity is characterized by Froude number and Reynolds number. The amount of suspended particles in relation to turbidity has also been investigated and found that the turbidity level of 6.9 NTU decreases to 3.66 NTU, using 1-10 micron porous sintered glass at 0.2 l/min air flow. Keywords: micro bubble, suspended particle lift-up, Froude number, porous sintered glass diffuser, Turbidity.