1 DynaFil-project - Efficiënt en duurzaam water zuiveren met effectieve vergistingsketen Seminar: De rioolwaterzuivering van de toekomst
3 Energy in the urban water cycle Maximize recovery of organic matter from wastewater Collect organics for energy Separate water from organics Extract water from wastewater (Sewer Mining) Collect organics (DynaFil)
4 Sewer Mining (point-of-(re)use) Clean water production (FO-RO) Less fouling Removal of emerging compounds (hormones, PPCPs, etc.) Energy production Digestion of concentrated sewage Nutrient recovery Concentrated digestate
5 Total Concept DynaFil Sewage O 2, Al A-stage DynaFil N 2 Nitritation + Anammox DynaFil Effluent Sludge Digester DynaFil Nutrient recovery
6 Options for concentrating COD Collecting organics for energy Separation at source Black water collection, vacuum toilets Sewer mining Concentration of sewage (Forward Osmosis) Combined sewage systems Influent fine-sieves A-stage: Convert COD to suspended solids as much as possible and collect sludge (DynaFil)
biogas Kees Roest, Seminar, 3 december 2014 7 Separation at source discharge or reuse removal micro-pollutants (ozone/ac) (autotrophic) nirogen removal struvite precipitation nutrient rich product UASBseptic black water kitchen waste reuse sludge grey water hygienisation
8 Influent fine-sieves Screencap Finescreen supported biological wastewater treatment to enhance plant capacity Full scale pilot at Waste Water Treatment Plant Aarle Rixtel (NL) Started 1 November 2014, with 3 years duration
9 Options for concentrating COD DynaFil project Separation at source Black water collection, vacuum toilets Sewer mining Concentration of sewage (Forward Osmosis) Combined sewage systems Influent fine-sieves A-stage: Convert COD to suspended solids as much as possible and collect sludge (DynaFil) DynaFil project: Optimized A-stage Maximum amount of suspended organics Dynamic filtration (instead of settling tanks) Shorter sludge residence time Smaller footprint Anaerobic Dynamic Membrane BioReactor (AnDMBR) Higher sludge residence time Smaller footprint
10 Total concept of DynaFil Maximize recovery of organic matter from wastewater Sewage O 2, Al / Fe A-stage DynaFil N 2 Nitritation + Anammox DynaFil Effluent Sludge Digester DynaFil Nutrient recovery
12 A significant amount of sludge is washed out to the B- stage WWTP Sludge production (kgdw/d) Specific sludge production (gdw/gbod removed) SS Intermediate settler (mg/l) SS load to B- stage (kgdw/d) Nieuwveer 13975 1.3 44 9625 Dokhaven 24603 1.2 30 5634 Utrecht 18900 2.1 116 18651 Garmerwolde 14806 3.0 49 5976 Dynamic filtration to reduce the level of suspended solids flowing to the B- stage increase in sludge production and biogas production
14 Dynamic filtration principles STOWA Report 2011-w06 Dynamic membrane: cheap, relative coarse filter material (pore sizes from 3 to 500 µm) as support layer, on which arises a natural cake layer which is denser and ultimately responsible for the filtration Also called Coarse pore filtration Secondary membrane filtration Self-forming dynamic membranes Dynamic filtration is an alternative to settling tanks and membrane bioreactors
15 Dynamic filtration module
16 Dynamic filtration module
17 Dynamic filtration Flux profiles (45 minutes runs, delta-p = 17 cm H2O) Flux in liter per square meter per hour Blue = measured Red = run-averaged
21 150 135 120 Dynamic filtration 0,300 0,267 105 0,233 90 75 60 45 0,200 0,167 0,133 0,100 slibnivo (cm) filtraatnivo (cm) NTU slibgehalte (100 = 5 g/l) rwzi influent (100 = 10.000 m3/u) debiet (m3/u) netto debiet (m3/u) 30 0,067 15 0,033 0 0,000 27-05-14 0:00 27-05-14 12:00 28-05-14 0:00 28-05-14 12:00 29-05-14 0:00 29-05-14 12:00 30-05-14 0:00 30-05-14 12:00 31-05-14 0:00 DYNAFIL A-trap TBT B-trap NBT SLUDGE MORFOLOGY & FLUX (RWF)
22 750 675 23 augustus : 12:40 uur wisserfrequentie van 30 naar 3 minuten, 14:45 handmatig gereinigd Dynamic filtration 100 90 600 80 525 70 450 375 300 60 50 40 momentane flux netto flux Permeabiliteit dp (rechteras) NTU (rechteras) slibdebiet*10 (rechteras) 225 30 150 20 75 10 0 9:00 10:00 11:00 12:00 13:00 14:00 15:00 16:00 17:00 18:00 19:00 20:00 0
23 Conclusions and outlook Improving conversion soluble COD into sludge (A-stage) and preventing wash-out of solids to the B-stage can significantly increase amount of sludge for digestion Dynamic filtration shows promising results Relative stable flux on B-stage, except with Rain Water Flow Acceptable filtrate quality Flux is related to the sludge quality Back wash required, room for improvement An energy saving WWTP by dynamic filtration of A-stage sludge is not yet proven to be feasible
24 Kees Roest, Seminar, 3 december 2014 Kees Roest (kees.roest@kwrwater.nl), Marthe de Graaff, Tessa van den Brand, Mark van Loosdrecht (KWR) Bert Daamen (Bert Daamen Water & Energie) Louise Johann, Leonie Hartog, Etteke Wypkema (waterboard Brabantse Delta) Erik Rekswinkel (waterboard Stichtse Rijnlanden) Olaf Duin (waterboard Hollandse Delta) Willy Poeisz (waterboard Noorderzijlvest) Marcel Zandvoort (Waternet) Cora Uijterlinde (STOWA) 24 KWR Watercycle Research Institute
25 Anaerobic Dynamic Membrane BioReactor (AnDMBR) SUBMERGED MEMBRANE MODULE
26 After effective dynamic cake layer formation TSS < 10 mg/l at both SRTs 99% TSS retention R20 R40