Processi di depurazione acque urbane Milano S. Rocco Degrémont Italy - 27 th October 2014
Milano General overview 2 MILAN LOCATION OF THE MAIN WWTP 3 main collecting systems
Milano General overview 3 MILAN LOCATION OF THE MAIN WWTP PESCHIERA EI 250.000 Ave. Flow 1,4 m³/s Max. flow 2,7 m³/s 3 MILANO SAN ROCCO MILANO NOSEDO EI 1.050.000 Ave. Flow 4 m³/s Max. flow 12 m³/s 1 2 EI 1.300.000 Ave. Flow 5 m³/s Max. flow 15 m³/s
Milano General overview 4 MAIN DATA 1 SAN ROCCO Treatment capacity 1.050.000 EI Scope of works DBO Total amount 186 M Degrémont scope 39% DB 35 M 100% O&M (10 years) 97 M (base 2001) Construction Sep 2002 June 2004 Contractual operation period 5 + 4 years ( + 1) Operational period end Dec. 2014
Milano General overview 5 MAIN DATA 2 NOSEDO Treatment capacity 1.300.000 EI Scope of works DBO + BOT Total amount 269,7 M Degrémont quote ~23% Construction May 2001 Jan 2004 Contractual operation period 12,5 + 4 years (plus 1year - option) Operational period end Dec. 2019 (2020)
Milano General overview 6 MAIN DATA 3 PESCHIERA Treatment capacity 250.000 EI Scope of works DB & Start-up Total amount 22 M Degrémont quote 50% Construction Dec 2002 May 2005
Milano San Rocco
WWTP AREA Milano San Rocco 8
Milano San Rocco 9 WWTP - CONSTRUCTION CONTRATTO REALTA' Activity Duration 01 2002 2003 2004 2005 (Days) O N D J F M A M J J A S O N D J F M A M J J A S O N D J F M A M J J A S O N D J F M A M J J A S O N D 1 Contract Awarding 1 23/10 2 Execution Design 240 22/06 3 Client Approval 90 11/09 5 Works Execution 720 01/09 07/06 6 Provisional Test 60 31/10 13/07 7 Commissioning, 150 30/03 Performance Test 10/12 9 Final Test 30 30/03 30/11
WWTP VISTA LATO OVEST Milano San Rocco 10
WWTP VISTA DALL ALTO Milano San Rocco 11
Milano San Rocco 12 WWTP LAYOUT LAYOUT
Milano San Rocco 13 WWTP FLOW DIAGRAM FLOW DIAGRAM
Milano San Rocco 14 WWTP - BIOLOGICAL TREATMENT Reattori biologici Step feed aeration
DESIGN DATA INLET FLOWS Daily Flow 345.600 m³/d Ave. Flow dry season 4 (±15%) m³/s Peak Flow to pre-treatment 12 m³/s Peak Flow to biological treatment 9 m³/s
Milano San Rocco 16 DESIGN DATA INLET CHARACTERISTICS T min 12 C BOD 5 140 (± 20%) mg/l COD 235 (± 20%) mg/l TSS 135 (± 20%) mg/l TKN 20 (± 20%) mg/l Pt 3,5 (± 20%) mg/l
Milano San Rocco 17 DESIGN DATA OUTLET LIMITS BOD 5 10 mg/l COD Discharge 125 mg/l Reuse 50 mg/l TSS 10 mg/l Nt 10 mg/l Pt 1 mg/l E. Coli Discharge 5.000 UFC/100 ml Reuse 10 UFC/100 ml
Milano San Rocco 18 DESIGN DATA SLUDGE PRODUCTION Sludge production 13.400 t DS /y Final dryness 65 90 % Yearly dried sludge 20.600 14.890 t/y Dried Sludge storage 150 m³ Storage retention time 1,5 d
Milano San Rocco 19 OPERATIONAL DATA - typical INLET WATER CHARACTERISTICS Flow 282.200 m³/d 3,27 m³/s BOD 5 186 mg/l COD 296 mg/l TSS 164 mg/l TKN 25 mg/l Pt 3,2 mg/l
Milano San Rocco 20 OPERATIONAL DATA - typical TREATED WATER BOD 5 3,0 mg/l COD 18,1 mg/l TSS 1,6 mg/l Nt 7,9 mg/l Pt 0,9 mg/l E. Coli (discharge) < 1.000 UFC/100 ml E. Coli (reuse) < 5 UFC/100 ml
Milano San Rocco 21 OPERATIONAL DATA - typical REMOVAL EFFICIENCY INLET (mg/l) OUTLET (mg/l) Efficiency (%) BOD 5 215 5,30 97,53% COD 308 21,10 93,15% TSS 166 1,70 98,98% N t TKN 24 7,10 70,42% Pt 3,4 0,80 76,47%
Milano San Rocco 22 OPERATIONAL DATA - typical TREATED WATER REUSE TREATED WATER FOR REUSE Period Pizzabrasa Flow Carlesca Flow Total m3 m3 m3 May 2008 435.600 65.340 500.940 June 2008 316.800 369.468 686.268 July 2008 2.538.000 1.711.908 4.249.908 August 2008 0 1.606.176 1.606.176 September 2008 0 377.784 377.784 TOTAL 3.290.400 4.130.676 7.421.076
Milano San Rocco 23 OPERATIONAL DATA - typical WHERE TREATED WATER REUSE MILAN Treated water reuse AREAS
Milano San Rocco 24 OPERATIONAL DATA - typical SLUDGE PRODUCTION Yearly production 6.377 t DS/y Dried sludge 5.382 t DS/y Dryness 91,2 % Dewatered sludge 995 t DS/y Dryness 24,1 %
Milano San Rocco 25 OPERATIONAL DATA - typical SLUDGE DESTINATION Sludge production: 6.377 t DS/y Agriculture 19% TOTAL SLUDGE DESTINATION Cement 81% Ind.
Milano San Rocco 26 OPERATIONAL DATA - typical SLUDGE DESTINATION Dried sludge: 5.382 t DS/y DRIED SLUDGE DESTINATION Agriculture 4% DEWATERED SLUDGE DRIED SLUDGE Cement - 96% Agriculture 100% 4% Cement 96% Ind. Dewatered sludge: 995 t DS/y 100% agriculture
Milano San Rocco 27 DRIED SLUDGE FINAL DESTINATION Dried sludge to cement industry - Holcim (Merone & Ternate) Authorized quantity: 13.500 t/year Dried sludge export Dossier export: starting from April 2008 Destination: Holcim Cement industry Dotternhausen (D) Cost: 86 /t Authorized quantity: 2.000 t/year
Milano San Rocco 28 WWTP - INDICATORI DI GESTIONE - tipico 2006 2011 Portata acque trattate ( M m 3 / anno ) 92,3 104,7 COD eliminato (kt COD eliminato/anno) 24,97 28,79 Consumo specifico di energia elettrica (kwh/m 3 acque trattate) 0,31 0,30 Produzione specifica fango (t MS/M m 3 acque trattate) 82,2 54,8 Produzione specifica fango (t MS/t COD eliminato) - 0,20 Volume specifico trattato (M m 3 acque trattate / Effettivi) 2,7 3,0 Costi totali specfici (cent / m 3 acqua trattata) <13 <13
Milano San Rocco 29 WWTP - Evoluzione dei costi operativi Contractual revenues fixed till end of 2009 (escalation price formula starting from 2010) Unforeseen increasing costs (especially linked to the petroleum fluctuating price): Energy Electricity 0,083 /kwh in 2005 0,117 /kwh in 2009 + 41% ~ 900 k /y (Total consumption ~ 26 GWh/y) Natural gas 0,27 /Nm³ in 2005 0,34 /Nm³ in 2009 + 26% ~ 157 k /y (Total consumption ~ 2.250.000 Sm³/y) Chemicals FeCl 3 0,100 /kg in 2005 0,138 /kg in 2009 + 38% ~ 75 k /y (Total consumption ~ 1.950 t/y) Maintenance (full services excluded) Total plant 330 k in 2005 570 k in 2009 + 73% ~ 240 k /y