Phos4You PhosForce Upgrading Phosphorus Recovery

Transcription

1 Phos4You PhosForce Upgrading Phosphorus Recovery Marisa Cunha, Cédric Mebarki VEOLIA 3rd EUROPEAN NUTRIENT ECOMONDO November 2018, Rimini, Italy

2 Objective: % recovery > 50 % recovery Various pilot projects: Scotland, part of the Phos4You project. In partnership with the ERI, Scotland. Lille, France, part of the Phos4You project. In partnership with the IRSTEA, France. Schönebeck, Germany PhosForce project. Consortium: o Veolia o MEERI, Poland o UNL, Portugal Funding Rimini, 8/11/

3 from Sept to Sept We deliver Phosphorus made in Europe Phosphorus is a nutrient essential for all living organisms, but a finite resource on earth. Phos4You proves that Phosphorus recovery & recycling from waste water is possible.

4 Schematic of the plant WW Sludges Co-substract Sludge separation IRSTEA / METAPHOS STRUVIA Digester Rimini, 8/11/2018 Sludge separation Struvite MAP - CaP Land application or Industrial reuse 4

5 Struvia pilot trials Initial test at Lille in 2016 ph (ph units) Sol. P-PO 4 (mg/l) Sol. N-NH 4 (mg/l) Sol. Mg (mg/l) Brussels: Effluent from Athos (Wet Air Oxidation process) TSS (g/l) Rimini, 8/11/ tcod (g/l) Sol. Ca (mg/l) P-PO 4 Removal (%) < <10 > 80 Brussels: Mixture Athos + centrate of thickened sludge < > 85, often > 90 Braunschweig: centrate from digested sludge < > 90, often > 95 Lille- Marquette: Mixture 1 st + 2 nd digestion centrates (DLD with Exelys thermohydrolysis process) done with a lab pilot unit < Dairy in Poland: Filtrate from digested sludge ~

6 Quality of the struvite produced by STRUVIA Total P= %wds (app %w de P 2 O 5 ) Total N=5-5.5 %w Mg = %w Organic Carbon < 1 %w Ca = g/kg K = g/kg SiO 2 = around 2 g/kg SO 4 = mg/kg Fe = mg/kg Al = mg/kg Mn = mg/kg Zn = mg/kg Cu = around 3 mg/kg Cr = around 2 mg/kg Cd, Ni, Pb < 2 mg/kg Sn < 2 mg/kg Se < 0.5 mg/kg As < 0.5 mg/kg Hg < 0.1 mg/kg Granulometry: 200 to 500 µm in steady state operation conditions Pure struvite composition: - N/P/Mg = 5.7/12.6/9.9 - (29 % P2O5) STRUVIA plant at Helsingør, Denmark Drained struvite crystals Fertilizer granules including STRUVIA granules Fertilizer granules including STRUVIA crystals Rimini, 8/11/2018 6

7 H. Exch. Pilot schematic: IRSTEA-VEOLIA processes Bio Acidification reactor Heat from CHP Biological Phosphorous Dissolution Potential (BDBP) test was develop to assess the maximum amount of P that could be biologically released from WAS prior liquid recovery process. This process has been developped by IRSTEA, our partner Co-substract Sludge Solid/Liq. separation Buffer Sludge to digestion Effluent to digestion STRUVIA OPALIX P recovered P as MAP or CaP product STRUVIA Suitable for use with MgO, MgCl2, Ca(OH)2, OPALIX Metals adsorption Brine to WWTP-Offsite Rimini, 8/11/2018 7

8 Pilot implementation Bio-acidification Dewatering DW liquour buffer tank OPALIX + Struvia Struvia Opalix Buffer tank Bio-acidification Rimini, 8/11/

9 Sludges selection Sludge samples have been collected at Lille-Marquette plant, at different treatment stages: Primary treatment Biological stage Sands Primary sludge Bio sludge thickener C5 Mixing tank Digestor 1 S2 S3 S1 : Thickened Bio sludge S2 : Mixed sludges S3 : Digested sludge D4 : Bio sludge C5 : Primary sludge D4 S1 Lysis Tertiary treatment Digestor 2 Dewat. - Dryer Rimini, 8/11/

10 mgp/l % ph First results Total phosphorus in inlet sludge and ortho-phosphate released % P-PO4 solubilised and recovered after bio-acidification and dewatering Batch Batch 5,5 5,0 4,5 4,0 3,5 3,0 TP (inlet sludge) P-PO4 (post-bioacidification) % dissolution P-PO4/TP % recovered in DW liquour (P-PO4/TP) ph reached Fluctuations in inlet sludge quality due to the heterogeneity of the mix (primary, bio, storm water sludges). Feed ph between 5.5 and 6 Up to 800 mg/l, > 70% dissolution and recovery of P-PO 4 on best batch. ~6 x current [P-PO 4 ] post-digestion Rimini, 8/11/

11 mol/mol ph mol/mol ph First results Molar ratios of relevant elements after bio-acidification. 1,5 5,5 0,15 5,5 1,2 5,0 0,12 5,0 0,9 4,5 0,09 4,5 0,6 4,0 0,06 4,0 0,3 3,5 0,03 3,5 0, Batch 3,0 0, Batch 3,0 N/P Ca/P Mg/P ph reached Fe/P Al/P ph reached Recovered P product will probably be calcium phosphate or a mix of CaP and MAP-struvite. Low Fe/P and Al/P molar ratios (<0.15 mol/mol). Low probability of having major complexation of PO 4 by those elements. Rimini, 8/11/

12 Tests to be continued and results to be improved upon. Thank you for your attention. Rimini, 8/11/