The characteristics of various non-woven fabric filters in wastewater treatment

The characteristics of various non-woven fabric filters in wastewater treatment
non-woven fabric filters; nitrogen removal; Anoxic-aerobic process; wastewater treatment; Dynamic gel layer; Membrane bio-reactor; Membrane fouling; Microfilter; Soluble microbial products
Issue Date
IWA-MTC 2011
A 100 μm polypropylene and 0.25 μm polyethylene material were used to make a non-woven fabric filter-MBR and the microfilter-MBR modules, respectively. And the performance and mechanism of two processes were investigated including additional batch filtration tests in order to find out the function of dynamic gel layer on the membrane surface. Two MBRs, based on anoxicaerobic reactor, in which each of the non-woven fabric filter (NWFF) and microfilter (MF) was submerged showed similar removal performances of organic matters, suspended solids and nitrogen. In addition, the head drops by gravitation filtration in the non-woven fabric filter-MBR were maintained below only 3 cm without any chemical backwash. The cake formation on the non-woven fabric filter was critical resistance, it was contrary to a conventional microfilter, the gel layer on the microfilter or internal foulants of pore played a key role in fouling on membrane surface. Soluble EPS of attached sludge on the non-woven fabric filter surface was larger than that of the suspended one, so it could be concluded that would be different growth or decay condition in the cake or dynamic gel layer. Not only the quality of permeate but also permeability of membrane if any control to remove dynamic gel by physical backwash would not be conducted, might be deteriorated. And, these may become severe as the transmembrane pressure increases.
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