Anaerobic Membrane Bioreactor followed by reverse osmosis filtration a novel solution for resource recovery from fodd industry

Transcription

1 Anaerbic Membrane Bireactr fllwed by reverse smsis filtratin a nvel slutin fr resurce recvery frm fdd industry Water Arabia 2017 Petr Hrecky (petr.hrecky@velia.cm) M.M.J. Baudry, S. Pachec-Ruiz, J. van der Lubbe, T. Arnaud Water Technlgies

2 Cntents f presentatin Fd Industry Wastewater Anaerbic prcesses Anaerbic Membrane Bireactr Full scale fd industry plant peratinal results 2

3 Fd Industry wastewater Origin Cleaning water fr raw materials Transprt water Prducts r semi prducts washing water Equipment r pipewrks cleaning - CIP Characteristics High variatins flw, COD, ph High cntent f rganic easy degradable COD High cntent f TSS High cntent f FOG Can be high in nutrients N,P Higher temperature f wastewater.

4 Drivers f Anaerbic Technlgy Heat lss Bigas CH 4 28 Nm 3 CO 2 9 Nm kwh Aeratin 100 kwh Aerbic BOD Air (O 2 ) 100 kg COD Carbn Dixide Bimass Effluent 2 10 kg COD Anaerbic 100 kg COD BOD (25 O C 35 O C) 80% Bigas (75% Methane) 5% Bimass Effluent 15 kg COD Sludge kg COD Sludge 5 kg COD 1 kg COD remved 0.35 Nm 3 CH kwh

5 Intrductin t AnMBR Anaerbic digestin cmbined with crss flw UF membrane separatin Tw prven technlgies Key differentiatrs: 1. Excellent permeate quality, suitable fr reuse 2. Very stable and rbust anaerbic bilgical prcess 3. Treatment f high FOG & TSS streams 4. Cmpact slutin 5. (State f the art technlgy fr bigas prductin) 5

6 AnMBR 1. Excellent permeate quality, suitable fr reuse Permeate free f suspended slids Up t 99+ % f COD remval due t membrane barrier Permeate suitable fr reuse r nutrient recvery applicatins POSSIBLE TECHNOLOGY COMBINATIONS AnMBR + RO water reuse AnMBR + Anitamx N remval, ptimized bigas prductin AnMBR + Struvite P & N recvery as fertilizer 6

7 AnMBR 2. Very stable and rbust bilgical prcess 100% bimass retentin due t presence f Ultrafiltratin Membranes In existing references hardly any VFA increase in permeate Increase in VFA is a sign f a disturbed anaerbic prcess, this ften is seen in granular sludge systems! Able t cpe with relatively large fluctuatins in inlet COD cncentratins and lad Althugh prper buffering and pre acidificatin is imprtant 7

8 AnMBR 3. Suitable fr treatment f high FOG & TSS N sludge washut due t TSS and FOG in inlet because f membrane barrier Slid retentin time sufficiently lng t degrade TSS and FOG Because f this ften the AnMBR scheme results in the highest bigas yield Example f cmbined treatment f dairy wastewater and streams:

9 Typical prcess scheme incl granular sludge technlgies Wastewater Bigas treatment + strage Bigas Bigas t biler / CHP unit Buffer tank Buffering + Pre-acidificaitn DAF unit Fat separatin UASB / EGSB Anaerbic granular sludge treatment Aerbic treatment Residual N, P & COD remval Disc filter Fr final TSS remval When required DAF flat River discharge Off site dispsal Centrifuge Fr sludge treatment Off site dispsal

10 Typical prcess scheme with CSTR Wastewater Bigas treatment + strage Bigas Bigas t biler / CHP unit Buffer tank Buffering + Pre-acidificaitn DAF unit Fat separatin UASB / EGSB Anaerbic granular sludge treatment Aerbic treatment Residual N, P & COD remval Disc filter Fr final TSS remval When required DAF flat WAS Liquid fractin t aerbic treatment River discharge Bigas Other streams Prduct/market return CSTR Anaerbic treatment Centrifuge Fr sludge treatment Sludge Off site dispsal

11 Typical prcess scheme AnMBR Bigas treatment + strage Bigas t biler / CHP unit Wastewater Additinal treatment if needed Whey + Lactse Prduct/market return AnMBR Bigas prductin > 98% COD remval UF skids Sludge separatin Direct discharge if pssible (sewer?) Direct Reuse if required Sludge t sludge treatment Centrifuge Fr sludge treatment Sludge 11

12 Full scale prject - Cntext Dairy, Suth Africa Milk and cheese prducer Generatin f whey Cnsiderable increase in prductin Current wastewater discharged t sewer Treated by municipal treatment plant Bth unable t handle additinal flw and COD lad Wastewater and whey very suitable fr anaerbic treatment Resurce Recvery Plant Wdlands Operatr Training / General Overview / Aug

13 Resurce Recvery Plant Aims f the plant: 1. Reuse a significant part f the wastewater flw. By treating the wastewater by reverse smsis t reach reuse water quality 2. Reduce flw and COD lad t the sewer By reusing part f the wastewater int the factry and cnverting mst f the COD int bigas 3. Generate energy by cnverting COD frm wastewater int bigas By installing a Memthane reactr : anaerbic bacteria transfrm COD int bigas Wdlands Operatr Training / General Overview / Aug

14 Wastewater characteristics Parameter Units Cmbined feed t Acidificatin tank Flw rate m 3 /d 2000 m 3 /h 83.3 TSS ppm 2714 Ttal COD ppm 9900 Sluble COD ppm 6030 Particulate COD ppm 3870 TKN ppm N 360 Ttal Phsphrus ppm P 62* Sluble calcium ppm 60 Sluble magnesium ppm 95 Sulphate ppm SO 4 45 Nitrate ppm N 250 Nitrite ppm N 200 WW temperature C 31.6 (3) ph (-) 12 Wdlands Operatr Training / General Overview / Aug

15 AnMBR slutin Often mst cmpact slutin COD cncentratin after AnMBR = aerbic effluent quality CASE DAIRY SOUTH AFRICA Surface area extremely tight Cmparisn f required surface area fr treatment train including water reuse: Cnventinal apprach including CSTR: 1700 m2 AnMBR + RO: 575 m2 AnMBR + RO full scale plant at Site 1: (a) Buffer tank & Digester; (b) AnMBR UF skids; (c) RO 15

16 Resurce Recvery Plant Biler Acidificatin Tank Vibrating Screen 1000 m 3 AnMBR 3000 m 3 4 UF membrane skids RO Feed Tank 60 m 3 Reverse Osmsis Re use and Municipal Discharge Sludge Waste Centrifuge Wdlands Operatr Training / General Overview / Aug

17 Milk prcessing & cheese prductin Suth Africa peratinal results Peaks in VFA due t sudden peaks in lad > 2 x

18 Milk prcessing & cheese prductin Suth Africa peratinal results 6 000,0 RO1 Feed RO1 Pass 1 Permeate RO1 Pass 2 Permeate RO1 Water Quality 900, ,0 800,0 700, ,0 600,0 Cnductivity 3 000, ,0 500,0 400,0 300, ,0 200,0 100,0 0,0 0,0 5,0 47,0 311,0 618,0 924,0 Running Hurs 1 249, , , ,0

19 Milk prcessing & cheese prductin Suth Africa peratinal results RO1 Pass 1 Rejectin RO1 Membrane Salts Rejectin 100,00% RO1 Pass 2 Rejectin 95,00% 90,00% Salts Rejectin (%) 85,00% 80,00% 75,00% 70,00% 5,0 47,0 311,0 618,0 924,0 Running Hurs 1 249, , , ,0

20 Thank yu fr yur attentin! Any questin? 20