Filtration characteristics of immersed coarse pore filters in an activated sludge system for domestic wastewater reclamation

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).

Dynamic Membrane Filtration: Formation, Filtration, Cleaning, and Applications

“…Since the first study on DMs, various kinds of supporting membrane materials have been tested, including reverse osmosis (RO) membranes [71,72], UF membranes [73,74], MF membranes [73,[75][76][77], ceramic tubes [65,[78][79][80], stainlesssteel tubes [14,67,81], polymeric membranes [82,83], meshes [25,42,84], non-woven fabrics [85][86][87][88], and woven fabrics [89]. Considering the cost and flux of membranes, large-pore membranes are more frequently used in recent DM research.…”

Characteristics of bio-diatomite dynamic membrane process for municipal wastewater treatment

“…Many researchers have focused on the variations of effluent SS and flux of the dynamic membrane. The dynamic membrane could achieve a high solid-liquor separation efficiency (thus a low effluent SS) [14][15][16], and a high filtration flux [17]. The cleaning of dynamic membrane is convenient.…”

Bio-diatomite dynamic membrane reactor for micro-polluted surface water treatment

“…Dynamic membrane is formed on the underlying support mesh when filtering a solution containing fine particles, thus is also called secondary membrane (Kuberkar and Davis, 2000). The dynamic membrane formed on the relatively large-pore mesh increases the intrinsic membrane retention capacity (Alavi Moghaddam et al, 2002a,b), leading to a high solid-liquid separation efficiency and a high filtration flux (Seo et al, 2002(Seo et al, , 2007Fuchs et al, 2005). Dynamic membrane is also more convenient to clean than membrane reactor.…”