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Full Title

Does Reduction of SMPs by Addition Of Inorganic Coagulant Lead to Better biofim-MBR Performace?

Event

Euromembrane 2012, London, UK

Authors and Affiliations

Igor Ivanovic, Norwegian University of Science and Technology (NTNU)

TorOve Leiknes, Norwegian University of Science and Technology (NTNU)

Abstract

Addition of inorganic coagulants in the membrane filtration stage of the bioflm-MBR
had a positive effect on improvement of mixed liquor filterability and dewaterability,
resulting in lower fouling rates. Modified jar tests were done in aerated beakers to
determine applicable dosages by investigating effects on surface area of submicron
particles, colloids and effect on biochemical parameters.
Two chosen coagulant were used polymerized alum and iron (III) chloride.
Two dosages at lower and higher range of 9 to 22.5 ppm were chosen and tested in
sets of experiments on two membrane rectors operated in parallel. Membrane fouling
was reduced in a similar manner for both lower dosages of alum and iron applied,
however, iron performed better at the higher dose. Alum showed a better addressed
removal of organic content measured as SMPs, DOC and FCOD. Iron was more
effective in enlarging surfaces of flocs in the bulk phase, leading to more adsorption of
submicron particles on floc surfaces and consequently reduction of submicron
particles in the water. Improvement in membrane performances was found to
correlate to reduction of measured surface area of particles in the size range 0,04 -
0,3μm, enlargement of floc surface area for particles > 8 μm, as well as reduction of
concentration of the submicron organic content.

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