Water Science & Technology Vol 55 No 1-2 pp 51–58 © IWA Publishing 2007 doi:10.2166/wst.2007.006
Filtration characteristics of immersed coarse pore filters in an activated sludge system for domestic wastewater reclamation
G.T. Seo*, B.H. Moon*, Y.M. Park* and S.H. Kim**
*Department of Environmental Engineering, Changwon National University, Sarim-dong 9, Changwon, , Gyeongnam 641-773, South Korea (E-mail: gts@changwon.ac.kr)
**Department of Environmental Engineering, Kyungnam University, Wolyong-dong 449, Masan, , Gyeongnam 631-701, South Korea
ABSTRACT
The filtration characteristics of two different module configurations with coarse pore filter (non-woven fabric) were investigated for sludge floc separation in an activated sludge reactor for domestic wastewater reclamation. A polypropylene non-woven fabric filter (35 g/m2) was used for the two different module configurations, one flat and one tubular type, each with a filtration area of 0.052 m2. The different module types, submerged in the oxic compartment of A/O (anaerobic/oxic) type reactors, were operated simultaneously. The filtration fluxes were gradually increased from 0.5 to 1.2 and 1.73 m/d. The filtration pressures were more stably maintained for the tubular type module than the plate type. The tubular type module installed horizontally with two-side suction showed less filtration pressures than the tubular type module installed vertically with one-side suction. The solid separation was significantly high showing less than 5 mg/L effluent solids. The organic and T-N removal efficiencies were around 95 and 50%, respectively. The 85% removal of T-P was achieved with 20 mg/L injection of PAC (poly-aluminum chloride).
Keywords: Activated sludge; coarse pore filtration; domestic wastewater reclamation; solid separation
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