7 january, 2011 1 PRIOMF project Priority organic micropollutants filter Delft Marco Casola David de Ridder.

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Presentation transcript:

7 january, PRIOMF project Priority organic micropollutants filter Delft Marco Casola David de Ridder

7 january, Introduction Objective Insight in removal mechanisms organic micropollutants in BGAC filter in waste water application Optimize performance of this filter based on this insight Partners

7 january, Introduction Biodegradation Adsorption Synergy Adsorption & slow release micropollutants Adsorption & slow release nutrients Filtering of larger NOM molecules by biofilm Broadening spectrum of removable micropollutants

7 january, Pharmaceutical selection Bio degradation Adsorption Dominant process No removal Both

7 january, Carbon selection Microporous carbon (GCN1240; coconut, high activation) emphasize adsorption Non-porous carbon (lightly-activated GCN1240) Emphasize biodegradation Hydrophobic carbon Improve adsorption (?) Improve attachment biomass (?) Reference carbon (GAC1240)

7 january, Bacterial strain selection Ammonia oxidizing bacteria (AOB) Methanotrophs Both aspecific Both aerobic Will be pre-grown on carbon before experiment

7 january, Experiments Lab – adsorption (all on fresh & pre-grown) Hydrophobicity (HoI & TPD) Equilibrium adsorption pharmaceuticals Adsorption kinetics Lab – biodegradation AOB Biodegradation vs adsorption; blank/ref/micro/non-porous Influence AOB quantity; AOB spike/NH 4 dose/AOB inhibitor Efficacy methanotrophs; CH 4 dose Effect attachment biofilm; hydrophobic carbon/reference pilot

7 january, Pilot experiments Reservoir Filter Mix Dose μpol Positive Displacement Pumps Flow microreference Non porous hydrophobicBlank Waste Optional All columns (except blank); precultivated with AOB Effluent sampling port

7 january, Pilot experiments Fluidized bed! EBCT= 10 min Q= 0.02 m3/min (333 ml/min) Carbon diameter mm (0.5/0.9/1.3/1.7) V= m/h EBCT highest in smallest fraction Headloss (1.9 m, fluidized) = 0.73 m Biofilm more equally distributed over bed No clogging / preferential flow / anaerobic zone Carbon abrasion (integrity, mass, effect bio)? Positive effect abrasion on pore blockage? 3 cm 190 cm 7.5 cm

7 january, Pilot experiments

7 january, Results Lab experiments - adsorption Heat of immersion

7 january, Results Lab experiments - adsorption Heat of immersion ± mJ/m 2

7 january, Results Lab experiments - adsorption Heat of immersion CarbonBET surface (m 2 /g)Heat of Immersion (mJ/m 2 ) Ref; GAC Micro; GCN Micro GCN1240 extra activated 1400 m 2 /g Non porous; Cocochar, not activated Non porous; Cocochar, lightly activated What about the hydrophobic one?

7 january, january, Questions?